Intelligent lubrication system and control method for shaft-type main engine

Abstract

The present invention discloses an intelligent lubrication system and control method for a rotating shaft type main engine, relates to the technical field of lubrication system, and aims to solve the technical problem that the existing lubricating oil system needs to manually start the standby pump, which is not convenient for realizing the intelligent operation of the entire lubrication system. The key points of the technical solution include a unit, an oil supply pipeline, an oil tank, a main oil supply module, a standby oil supply module and a DC oil supply module, wherein the main oil supply module, the standby oil supply module and the DC oil supply module are all arranged on the oil tank, and the main oil supply module, the standby oil supply module and the DC oil supply module are connected to the oil supply pipeline, and the oil supply pipeline is connected to the lubrication part of the unit; and also includes a control center, a liquid level control module, an oil temperature control module, a pressure control module, a high-pressure top shaft module, an energy storage control module, a cleanliness detection module and a test module, and a corresponding control method. The automation and intelligence of the lubrication system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lubrication systems, and in particular to an intelligent lubrication system for a rotating shaft host and a control method thereof. Background Art

[0002] Steam turbine is a rotary power machine that converts steam energy into mechanical work. It is also called steam turbine. It is mainly used as the prime mover of generator sets. It can also directly drive various pumps, fans, compressors and ship propellers. It is the main power equipment of power plants, metallurgical blower stations, etc. Ensuring the safe and stable operation of steam turbines is a prerequisite for smooth production and maximum benefits. The function of steam turbine lubricating oil system is to provide lubrication for the support bearings, thrust bearings and turning gear of steam turbines, which is equivalent to the blood circulation system of the equipment.

[0003] The existing Chinese patent with publication number CN105545382A discloses a steam turbine lubrication system for a thermal power generator set, including a main pump lubrication unit, the main pump lubrication unit including: a main pump, an oil injector, a main pump check valve, and an oil cooler connected in sequence by oil pipes, one end of the oil cooler is connected to the main pump check valve, and the other end of the oil cooler leads to the lubricated parts through the oil pipe; the steam turbine lubrication system for the thermal power generator set also includes an AC pump lubrication unit and a DC pump lubrication unit. During the start-up and shutdown process of the unit, when the main shaft speed is less than 2700-2800r / min, the main pump lubrication unit cannot provide sufficient oil pressure and oil flow, and the AC pump lubrication unit is started at this time to meet the oil supply needs of the system. When the main pump lubrication system and the AC pump lubrication unit fail, the DC lubrication unit is started, and the DC pump outlet bypasses the oil cooler to prevent the oil cooler from failing and the bearing from burning the oil and the tile, thereby improving the safety and reliability of the unit operation.

[0004] The above-mentioned existing technical solutions have the following defects: the existing lubricating oil system requires manual detection and judgment of the oil pump, and manually starting the backup pump when the detection data is lower than the preset value, which is not convenient for realizing the intelligent operation of the entire lubrication system, so it needs to be improved. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide an intelligent lubrication system for a rotating shaft host, which has the advantages of improving the automation and intelligence of the lubrication system.

[0006] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0007] An intelligent lubrication system for a rotating shaft main engine, comprising a unit, an oil supply pipeline, an oil tank, a main oil supply module, a standby oil supply module and a DC oil supply module, wherein the main oil supply module, the standby oil supply module and the DC oil supply module are all arranged on the oil tank, the main oil supply module, the standby oil supply module and the DC oil supply module are connected to the oil supply pipeline, and the oil supply pipeline is connected to a lubricated part of the unit; characterized in that: it also includes a control center, a liquid level control module, an oil temperature control module and a pressure control module;

[0008] The liquid level control module includes a liquid level detection unit arranged on the oil tank and a liquid level processing unit arranged in the control center, wherein the liquid level processing unit is connected to the liquid level detection unit to receive the liquid level signal detected by the liquid level detection unit and control the start and stop of the main oil supply module, the standby oil supply module and the DC oil supply module;

[0009] The oil temperature control module includes an oil temperature detection unit for detecting oil temperature, an oil temperature processing unit arranged in a control center, and an oil temperature regulating unit connected in series in the oil supply pipeline, wherein the oil temperature processing unit is connected to the oil temperature detection unit to receive an oil temperature signal detected by the oil temperature detection unit and control the oil temperature regulating unit to regulate the oil temperature;

[0010] The pressure control module includes a pressure detection unit arranged on the oil supply pipeline and a pressure processing unit arranged in the control center. The pressure processing unit is connected to the pressure detection unit to receive the pressure signal detected by the pressure detection unit and start the backup oil supply module and / or the DC oil supply module.

[0011] By adopting the above technical solution, the control center detects the liquid level and oil temperature of the lubricating oil in the lubrication system through the liquid level control module and the oil temperature control module, and prohibits the lubrication system from starting when the liquid level is lower than the preset value and the temperature is lower than the preset value, thereby ensuring the safety of the unit; in addition, the control center detects the oil pressure in the lubrication system through the pressure control module, and interlocks and starts the backup oil supply module in time when the oil pressure is lower than the set value, that is, when the main oil supply module fails; thereby ensuring that the lubrication system of the unit is monitored by intelligent operation, maintenance and monitoring to achieve uninterrupted operation of the unit, thereby greatly improving the intelligence level of the lubrication system.

[0012] The present invention is further configured as follows: a high-pressure jacking shaft module is connected in the oil supply pipeline between the oil temperature regulating unit and the unit, and the high-pressure jacking shaft module is controlled by the control center to extract oil from the oil supply pipeline to forcibly jack up the rotor before the unit is started.

[0013] By adopting the above technical solution, the setting of the high-pressure jacking shaft module makes it easy to automatically draw lubricating oil from the oil supply pipeline before the unit is started and provide high pressure at the unit bearing to jack up the rotor, thereby forming a uniform oil film at the rotor of the bearing, reducing the probability of the oil film at the rotor being too thin due to excessive rotor mass, thereby ensuring that the unit can be started stably and safely even with a large mass.

[0014] The present invention is further configured as follows: an energy storage control module is also connected to the oil supply pipeline, and the energy storage control module is controlled by a control center to adjust the pressure of the oil supply pipeline.

[0015] By adopting the above technical solution, the accumulator control module automatically balances the oil pressure in the oil supply pipeline through the air pressure at the air end of the accumulator and the control access of the control center. When the oil pressure surges, the oil end compresses the air end to buffer the surge in oil pressure; when the oil pressure drops suddenly, the air end pushes the oil end to compensate for the sudden drop in oil pressure; the accumulator makes the oil pressure in the oil supply pipeline tend to be stable, and when the oil pump is switched, it can also ensure the continuous and stable output of oil pressure for a period of time, thereby ensuring continuous and stable lubrication of the bearings.

[0016] The present invention is further configured as follows: a cleanliness detection module is also connected to the oil supply pipeline, and the cleanliness detection module is connected to the control center to transmit the cleanliness information of the lubricating oil obtained by detection to the control center.

[0017] By adopting the above technical solution, the cleanliness detection module detects the particulate matter inside the oil supply pipeline and feeds back the feedback results to the control center in real time. When the number of particulate matter is greater than the preset value, the control center will alarm the operator, thereby reminding the operator to inspect the filter component in time to ensure that the filter can stably filter the lubricating oil, thereby reducing the bearing wear caused by excessive particulate matter in the lubricating oil.

[0018] The present invention is further configured as follows: the oil supply pipeline is provided with at least one set of test modules at the farthest bearing of the unit, and the test modules are used to perform online testing on the working status of the main oil supply module, the backup oil supply module, the DC oil supply module and the interlocking function.

[0019] By adopting the above technical scheme, the test module can perform online testing on the working status of the main oil supply module, the backup oil supply module, the DC oil supply module and the interlocking function. The working status of the main oil supply module, the backup oil supply module, the DC oil supply module and the interlocking function can be detected without causing shutdown of the unit, thereby maintaining the continuous operation of the unit. The test module can also promptly detect possible faults in the main oil supply module, the backup oil supply module, the DC oil supply module and the interlocking function and promptly remind the operator to repair them.

[0020] The present invention is further configured as follows: the test module includes four groups of test components, each group of test components includes a test orifice plate, a test pressure switch, a test solenoid valve, a test manual valve and a return line, the test solenoid valve is used to simulate a pressure drop, and the control center is coupled to the test pressure switch to respond to the pressure signal from the test pressure switch and control the corresponding main oil supply module, backup oil supply module, DC oil supply module or interlocking function to start.

[0021] By adopting the above technical solution, the test solenoid valve or the test manual valve is opened to return the oil into the oil tank through the return pipe to simulate the oil pressure reduction, and the pressure reduction is detected by the test pressure switch and fed back to the control center. The control center starts the corresponding main oil supply module, backup oil supply module, DC oil supply module or interlocking function, thereby realizing in-situ detection of the main oil supply module, backup oil supply module, DC oil supply module or interlocking function, and improving the accuracy and intelligence of the detection.

[0022] The second object of the present invention is to provide a control method for an intelligent lubrication system of a rotating shaft host, which has the advantage of automatically controlling the lubrication system to adjust and alarm according to the working status of the lubrication system.

[0023] The above-mentioned object of the present invention is achieved by the following technical solution: comprising the following steps:

[0024] S100, build the unit lubrication system and connect various equipment;

[0025] S200, the liquid level control module detects the liquid level in the oil tank and transmits the liquid level data to the control center. When the liquid level is lower than the liquid level alarm point, the control center controls the main oil supply module, the backup oil supply module and the DC oil supply module to prohibit starting;

[0026] S300, the oil temperature control module detects the oil temperature and transmits the oil temperature data to the control center, and the control center controls the lubrication system to prohibit starting and controls the oil temperature regulating unit to increase the temperature when the oil temperature is lower than the preset low temperature, and controls the oil temperature regulating unit to decrease the temperature when the oil temperature is higher than the preset high temperature;

[0027] S400, start the lubrication system, then the control center sends a control command to the high-pressure jacking shaft module, and the high-pressure jacking shaft module jacks up the rotor to prepare for the unit start-up;

[0028] S500, the control center starts the unit; after the unit is started, the energy storage control module stores energy and balances the pressure of the oil supply pipeline;

[0029] S600, the pressure control module detects the pressure in the oil supply pipeline and transmits the pressure data to the control center, and the control center starts the backup oil supply module and / or the DC oil supply module when the pressure exceeds the floating range;

[0030] S700: After running for a preset time, the test module tests the main oil supply module, the backup oil supply module, the DC oil supply module or the interlocking function.

[0031] By adopting the above technical scheme, the above control method can control the lubrication system to automatically start the lubrication system before the unit is started, detect the liquid level and oil temperature before the unit is started, and prohibit starting the lubrication system and the unit when the liquid level is lower than the preset value and the oil temperature is lower than the preset value; and before the unit is started, the rotor of the unit is lifted up by the high-pressure jacking shaft module to form a stable oil film, thereby ensuring the normal and stable operation of the unit; after the unit and the lubrication system are started, the oil pressure can also be monitored, and each oil supply module can be tested online at intervals, thereby ensuring the continuous operation of the lubrication system.

[0032] The present invention is further configured as follows: step S400 further includes the following sub-steps:

[0033] S410, the control center controls the drainage pipe valve in the high-pressure jacking shaft module to open, so that the lubricating oil in the oil supply pipeline enters the high-pressure jacking shaft module and exhausts the air in the high-pressure jacking shaft module;

[0034] S420, the control center starts the high-pressure oil pump in the high-pressure jacking shaft module, and the high-pressure oil pump sucks oil from the oil tank and pumps it to the bearings of the unit;

[0035] S430, the oil flow at the bearing is regulated by a high-pressure oil flow regulating valve and pressure compensation technology.

[0036] By adopting the above technical solution, when the speed of the steam turbine is very low, no oil film is formed between the journal and the bearing, and the journal will contact the bearing. If friction exists, the journal and the bearing may be scratched. In addition, if there is no oil film, the rotor may vibrate when rotating, which often causes the vibration of the blades. The setting of the high-pressure jacking module facilitates the extraction of clean lubricating oil from the oil supply pipeline and pumping it to the bearing at high pressure to forcibly jack up the rotor. In combination with the pressure-compensated flow regulation control technology, a stable oil film is formed at the bearing before the unit is started, thereby avoiding the start-up shock. It can effectively prevent the rotor jacking height from drifting or being unable to jack up during the second start-up of the unit, ensuring the safety and stability of the unit.

[0037] The present invention is further configured as follows: S510, the oil circuit pressure is checked in advance before the energy accumulator is started. If the oil circuit pressure is not zero, the control center closes the energy storage oil circuit isolation valve at the oil circuit inlet of the energy accumulator and slowly opens the energy storage control valve to discharge the pressure of the energy accumulator to zero. If the oil circuit oil pressure is zero, inflation can be performed;

[0038] S520, the control center controls the gas circuit isolation valve at the gas circuit inlet of the energy storage device to slowly open and slowly inflate, and when the gas circuit pressure rises to a preset value, the gas circuit isolation valve is slowly closed, and the inflation is completed;

[0039] S530, the control center slowly opens the energy storage oil circuit isolation valve to connect the energy storage device to the oil supply pipeline;

[0040] S540, at intervals, the pressure on one side of the gas circuit of the energy accumulator is detected, and if it is lower than the set value, the energy accumulator is inflated.

[0041] By adopting the above technical solution, the energy accumulator is connected in series in the oil supply pipeline and started through the control center, so that it can buffer when the oil pressure in the oil supply pipeline fluctuates; the control center can detect the air pressure of the energy accumulator at intervals, so as to compensate when the air pressure of the energy accumulator is low, ensuring that the energy accumulator maintains the function of continuously and stably eliminating pulsation in the oil supply pipeline.

[0042] The present invention is further configured as follows: step S700 further includes the following sub-steps:

[0043] S710, test the main oil supply module, any oil supply module other than the main oil supply module is running, open the test solenoid valve corresponding to the main oil supply module, the test pressure switch sends a signal to the control center, the control center controls the main oil supply module to start, the control center checks the parameters of the AC oil pump in the main oil supply module and compares them with normal values. When the test value is greater than the set value, the control center outputs a signal indicating that the main oil supply module starts normally, controls the corresponding test solenoid valve to close, and closes the main oil supply module after a delay; when the test value is less than the set value, outputs a main oil supply module fault, and reminds the operator to perform maintenance;

[0044] S720, testing the standby oil supply module and the DC oil supply module in sequence. When testing the standby oil supply module, any oil supply module other than the standby oil supply module is in operation. When testing the DC oil supply module, any oil supply module other than the DC oil supply module is in operation.

[0045] S730, test the interlocking function, the main oil supply module or the backup oil supply module is running, open the test solenoid valve corresponding to the interlocking function test, the test pressure switch sends a signal to the control center, the control center controls the interlocking function to start, that is, the backup oil supply module or the main oil supply module that serves as a backup for each other is started, the control center checks the parameters of the AC oil pump and compares them with normal values, when the test value is greater than the set value, the control center outputs a signal that the main oil supply module is started normally, and controls the corresponding test solenoid valve to close, and closes the main oil supply module after a delay; when the test value is less than the set value, the interlocking function fault is output to remind the operator to perform maintenance.

[0046] By adopting the above technical solution, while maintaining the normal operation of the unit, the control center sends a signal to the test solenoid valve, the test solenoid valve opens, and the test orifice plate releases pressure to simulate a pressure drop, which is used as a signal to start the main oil supply module, the backup oil supply module, the DC oil supply module or the interlocking function, and by comparing the working parameters of the AC oil pump in the main oil supply module, the backup oil supply module, the DC oil supply module or the interlocking function to determine whether the working status of the main oil supply module, the backup oil supply module, the DC oil supply module or the interlocking function is normal, thereby realizing the test of the main oil supply module, the backup oil supply module, the DC oil supply module or the interlocking function without affecting the oil supply of the lubrication system to the unit.

[0047] In summary, the beneficial effects of the present invention are:

[0048] 1. The control center, high-pressure jacking module, oil temperature control module and liquid level control module are matched. The control center monitors the pressure control module, oil temperature control module and liquid level control module to control the start-up of the lubrication system, thereby maintaining the safe start-up of the unit;

[0049] 2. The technology of matching the control center, pressure control module, energy storage control module and cleanliness detection module is adopted. The control center monitors the pressure control module, oil temperature control module and liquid level control module, thereby ensuring the safety of the unit and the continuous operation effect of the lubrication system during operation;

[0050] 3. The technology of coordinating the test orifice plate, test pressure switch, test solenoid valve, test manual valve and return line in the control center and test module is adopted to produce the effect of automatically testing the main oil supply module, backup oil supply module, DC oil supply module or interlocking function in situ. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the overall structure of an intelligent lubrication system for a shaft-type host in an embodiment;

[0052] Figure 2It is a structural block diagram for showing the control logic of the control center in the embodiment;

[0053] Figure 3 This is a schematic diagram for showing the structure of a high-pressure top shaft module in an embodiment;

[0054] Figure 4 A schematic diagram for showing the structure of a test module in an embodiment;

[0055] Figure 5 It is a flow chart of a control method of an intelligent lubrication system for a rotating shaft host;

[0056] Figure 6 for Figure 5 Schematic diagram of the process of step S400;

[0057] Figure 7 for Figure 5 Schematic diagram of the process of step S500;

[0058] Figure 8 for Figure 5 Schematic diagram of the process of step S700.

[0059] In the figure: 1. Unit; 11. Oil supply pipeline; 110. High-pressure oil flow regulating valve; 12. Oil tank; 13. Main oil supply module; 14. Backup oil supply module; 15. DC oil supply module; 2. Control center; 3. Liquid level control module; 31. Liquid level detection unit; 311. Visual liquid level gauge; 32. Liquid level processing unit; 4. Oil temperature control module; 41. Oil temperature detection unit; 42. Oil temperature processing unit; 43. Oil temperature regulating unit; 431. Heater; 432. Oil cooler; 4321. Water regulating valve; 5. Pressure control module; 50. Oil supply orifice plate; 501. Pressure regulating valve; 51. Pressure detection unit; 52. Pressure processing unit element; 6. High-pressure top shaft module; 61. High-pressure isolating valve; 62. High-pressure oil pump module; 621. Drainage pipe valve; 622. Drainage orifice plate; 623. Inlet check valve; 624. Exhaust orifice plate; 625. High-pressure oil pump; 626. Outlet check valve; 627. High-pressure control valve; 7. Energy storage control module; 71. Energy storage device; 72. Energy storage oil circuit isolation valve; 73. Energy storage control valve; 74. Gas circuit isolation valve; 8. Cleanliness detection module; 81. Filter; 9. Test module; 91. Test assembly; 911. Test orifice plate; 912. Test pressure switch; 913. Test solenoid valve; 914. Test manual valve; 915. Return line. DETAILED DESCRIPTION

[0060] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0061] Example:

[0062] An intelligent lubrication system for shaft-type mainframes, referring to Figure 1 and Figure 2 , which includes a unit 1, an oil supply pipeline 11, an oil tank 12, a main oil supply module 13, a standby oil supply module 14 and a DC oil supply module 15. The unit 1 includes a generator and a steam turbine connected to the generator through a coupling, and the rotors of the steam turbine and the generator are provided with multiple bearings. The main oil supply module 13, the standby oil supply module 14 and the DC oil supply module 15 are all arranged on the oil tank 12. The main oil supply module 13 and the standby oil supply module 14 are standby for each other. The main oil supply module 13 and the standby oil supply module 14 both use an AC oil pump; the DC oil supply module 15 includes a DC power supply, an inverter and an AC oil pump, so as to facilitate the use of the same control method for the three oil supply modules. The main oil supply module 13, the standby oil supply module 14 and the DC oil supply module 15 are connected to the oil supply pipeline 11, and the oil supply pipeline 11 is connected to the lubricated part of the bearing of the unit 1 to lubricate the bearing of the unit 1.

[0063] Reference Figure 1 and Figure 2 The lubrication system further includes a control center 2, a liquid level control module 3, an oil temperature control module 4 and a pressure control module 5. The control center 2 is a PLC or an industrial computer, and in this embodiment, a PLC controller is preferred. The liquid level control module 3 includes a liquid level detection unit 31 arranged on the oil tank 12 and a liquid level processing unit 32 arranged on the control center 2. The liquid level detection unit 31 includes a visual liquid level meter 311 installed on the oil tank 12 and a remote liquid level sensor L1 installed on the oil tank 12. The remote liquid level sensor L1 is connected to the control center 2. The liquid level processing unit 32 is connected to the liquid level detection unit 31 to receive the liquid level signal detected by the liquid level detection unit 31 and control the start and stop of the main oil supply module 13, the standby oil supply module 14 and the DC oil supply module 15. When the liquid level is lower than the alarm point set by the control center 2, the main oil supply module 13, the standby oil supply module 14 and the DC oil supply module 15 are not allowed to start, so as to ensure the safety of the lubrication system.

[0064] Reference Figure 1 and Figure 2The oil temperature control module 4 includes an oil temperature detection unit 41 for detecting the oil temperature, an oil temperature processing unit 42 arranged in the control center 2, and an oil temperature regulating unit 43 connected in series in the oil supply pipeline 11. The oil temperature detection unit 41 includes an oil tank temperature sensor T1 installed on the oil tank 12 and a pipeline temperature sensor T2 installed on the oil supply pipeline 11; the oil temperature processing unit 42 sets the minimum temperature t1 of the oil tank 12 and the maximum temperature t2 of the oil tank 12, the normal pipeline temperature t3 and the maximum pipeline temperature t4. If the temperature is lower than t1, the lubrication system cannot operate. If the temperature is higher than t2, the lubrication oil system cannot reduce the oil supply temperature to an appropriate range. It is considered normal within the range of t3±2℃. Oil supply above t4 will cause high bearing temperature. The oil temperature processing unit 42 is connected to the oil temperature detection unit 41 to receive the oil temperature signal detected by the oil temperature detection unit 41 and control the oil temperature adjustment unit 43 to adjust the oil temperature. The oil temperature adjustment unit 43 includes a heater installed in the oil tank 12 and an oil cooler 432 installed on the oil supply pipeline 11. A water flow regulating valve 4321 is provided on the water inlet pipe of the oil cooler 432. A temperature sensor T3 is installed on the water inlet pipe of the oil cooler 432. The oil temperature adjustment unit 43 sets a cooling warning temperature t5. Above t5, the lubricating oil system cannot reduce the oil supply temperature to an appropriate range.

[0065] Reference Figure 1 and Figure 2 Two oil supply orifice plates 50 are connected in series in the oil supply pipeline 11. Pressure measuring points are set at both ends of the oil supply orifice plates 50, and the pressure at both ends of the oil supply orifice plates 50 can be manually detected. The detected pressure can be input into the control center 2, and the flow through the oil supply orifice plate 50 is calculated, which is the real-time oil supply flow of the lubricating oil system. One of the two ends of the oil supply orifice plate 50 is connected in parallel with a pressure regulating valve 501, and the pressure regulating valve 501 realizes fine pressure regulation. The oil supply orifice plate 50 connected in parallel with the pressure regulating valve 501 realizes a wide range of pressure regulation, and the lubricating oil supply pressure can be controlled.

[0066] Reference Figure 1 and Figure 2The pressure control module 5 includes a pressure detection unit 51 arranged on the oil supply pipeline 11 and a pressure processing unit 52 arranged in the control center 2. The pressure detection unit 51 includes an oil supply pressure transmitter P1 at the front end of the oil cooler 432 and a pipeline pressure sensor P2 installed on the oil supply pipeline 11. The pressure processing unit 52 is provided with a normal oil supply pressure p1, a normal pipeline pressure p2 and a minimum pressure p3. Insufficient oil supply below p1 will cause high bearing temperature. It is considered normal within the range of p2±0.02MPa. Insufficient oil supply below p3 will cause high bearing temperature. The pressure processing unit 52 is connected to the pressure detection unit 51 to receive the pressure signal detected by the pressure detection unit 51 and start the standby oil supply module 14 and / or the DC oil supply module 15; when the pressure is lower than p1, the pressure processing unit 52 sends a "low pressure" signal, the standby oil supply module 14 is started, and the DC oil supply module 15 is started by interlocking; when the indicated pressure reading is lower than p3, the pressure processing unit 52 sends a "low pressure" signal, and the DC oil supply module 15 is interlocked and put into operation.

[0067] Reference Figure 2 and Figure 3 A high-pressure top shaft module 6 is connected between the oil temperature regulating unit 43 and the unit 1 in the oil supply pipeline 11. The high-pressure top shaft module 6 is controlled by the control center 2 to extract oil from the oil supply pipeline 11 before the unit 1 is started to forcibly lift the rotor. The high-pressure top shaft module 6 includes a high-pressure isolation valve 61, two sets of high-pressure oil pump modules 62 and a high-pressure pressure sensor P4. The high-pressure oil pump module 62 includes a drainage pipe valve 621, a drainage orifice plate 622, an inlet check valve 623, an exhaust orifice plate 624, a high-pressure oil pump 625 and an outlet check valve 626. One end of the high-pressure isolation valve 61 is connected to the oil supply pipeline 11, and the other end is connected to the drainage pipe valve 621. The other end of the drainage pipe valve 621 is connected to the drainage orifice plate 622. The other end of the drainage orifice plate 622 is connected to the inlet check valve 623. The inlet check valve 623 Installed in the oil tank 12; the pipeline where the drainage orifice plate 622 and the inlet check valve 623 are located is connected to the oil inlet pipe of the high-pressure oil pump 625; the exhaust pipeline is connected between the high-pressure oil pump 625 and the pipeline where the drainage orifice plate 622 is located, and the exhaust pipeline is connected to the oil tank 12, and the exhaust pipeline is also connected in series with an exhaust orifice plate 624 for detecting flow; the oil outlet pipe of the high-pressure oil pump 625 is connected to the outlet check valve 626, and a high-pressure control valve 627 is connected in series between the outlet check valve 626 and the high-pressure oil pump 625, and the other end of the high-pressure control valve 627 is connected to the oil tank 12. The outlet check valve 626 is jointly connected to the high-pressure pressure sensor P4, so that when the pressure of the high-pressure control valve 627 is lower than the preset value, the oil in the oil tank 12 is pumped out and injected into the bearing through high pressure to lift the rotor.

[0068] Reference Figure 1 and Figure 2The oil supply pipeline 11 is also connected to an energy storage control module 7, which is controlled by the control center 2 to adjust the pressure of the oil supply pipeline 11. The energy storage control module 7 includes a plurality of energy storage devices 71 connected in parallel, and an energy storage oil circuit isolation valve 72 is installed at the oil end of the energy storage device 71, and an energy storage control valve 73 and an oil circuit pressure sensor P11 are installed between the energy storage oil circuit isolation valve 72 and the energy storage device 71; an air circuit isolation valve 74 is installed at the gas end of the energy storage device 71, and an air circuit pressure sensor P12 is installed between the gas circuit isolation valve 74 and the energy storage device 71. The energy storage device 71 is connected to the oil circuit to absorb the high pressure through the gas end, and performs pressure compensation through the gas end at low pressure, thereby ensuring the stability of the oil supply pressure.

[0069] Reference Figure 1 and Figure 2 A cleanliness detection module 8 is also connected to the oil supply pipeline 11. The cleanliness detection module 8 is an online particle detector. A filter 81 is also installed on the side of the oil cooler 432 close to the unit 1. The cleanliness detection module 8 is connected to the control center 2 to transmit the cleanliness information of the lubricating oil obtained by the detection to the control center 2, so as to prompt the operator to replace the filter 81 in time.

[0070] Reference Figure 2 and Figure 4 The oil supply pipeline 11 is located at the farthest bearing of the unit 1 and is provided with at least one set of test modules 9, which are used to perform online testing on the working status of the main oil supply module 13, the backup oil supply module 14, the DC oil supply module 15 and the interlocking function.

[0071] Reference Figure 2 and Figure 4 The test module 9 includes a test control valve and four test components 91. Each test component 91 includes a test orifice plate 911, a test pressure switch 912, a test solenoid valve 913, a test manual valve 914 and a return line 915. The four test orifices 911 are connected to the test control valves respectively. The other end of the orifice plate is connected to the test solenoid valve 913. The test solenoid valve 913 is connected to the return line 915. The return line 915 is connected to the oil tank 12. The two ends of the test solenoid valve 913 are connected in parallel with the test manual valve 914. The test solenoid valve 913 is used to simulate the pressure drop. The control center 2 is coupled to the test pressure switch 912 to respond to the pressure signal from the test pressure switch 912 and control the corresponding main oil supply module 13, the backup oil supply module 14, the DC oil supply module 15 or the interlocking function to start. Control center 2 controls the test solenoid valve 913 to open, the test orifice plate 911 releases pressure, the test pressure switch 912 detects the pressure drop and sends a signal to control center 2, and control center 2 sends a start signal to the corresponding AC oil pump and detects its current parameters to test whether it is faulty.

[0072] A control method for an intelligent lubrication system of a shaft-type main engine, referring to Figure 5 , including the following steps:

[0073] S100, build the unit lubrication system and connect various equipment;

[0074] S200, the liquid level control module 3 detects the liquid level in the oil tank 12, and transmits the liquid level data to the control center 2. When the liquid level is lower than the liquid level alarm point, the control center 2 controls the main oil supply module 13, the backup oil supply module 14 and the DC oil supply module 15 to prohibit starting;

[0075] S300, the oil temperature control module 4 detects the oil temperature and transmits the oil temperature data to the control center 2. When the oil temperature is lower than the preset low temperature, the control center 2 controls the lubrication system to prohibit starting and controls the oil temperature adjustment unit 43 to increase the temperature, and controls the oil temperature adjustment unit 43 to reduce the temperature when the oil temperature is higher than the preset high temperature. Before the lubricating oil system is put into operation, if the temperature T1 is lower than t1, the temperature in the oil tank 12 is low. The oil temperature processing unit 42 issues a heater 431 start instruction, the heater 431 is put into operation, and the temperature of the oil tank 12 slowly rises. The heater 431 is not allowed to be put into operation for a long time. The oil temperature processing unit 42 is set to "has been put into operation for 4 hours" or "the temperature in the oil tank 12 has exceeded t1". When any signal is triggered, the heater 431 stops being put into operation. If the temperature in the oil tank 12 still does not reach the temperature 1, the oil temperature processing unit 42 issues a heater 431 start instruction again, and repeats the above control logic until the temperature in the oil tank 12 exceeds t1. However, when the heater 431 start command is issued more than 3 times, the oil temperature processing unit 42 cannot automatically restart the heater 431, and manual judgment is required before the heater 431 can be restarted. When the oil temperature T1 of the oil tank 12 exceeds t1, the main oil supply module 13 is allowed to start. After the lubricating oil system is put into operation, the oil cooler 432 is also put into operation. When the temperature T2 exceeds t2, an alarm signal is issued to remind the operator to check the cause of the fault and eliminate it.

[0076] After the lubricating oil system is put into operation, the detection data of the pipeline temperature sensor T2 on the lubricating oil supply pipeline 11 will be transmitted to the control center 2 in real time. The control center 2 compares it with the temperature 3, adjusts the opening of the water regulating valve 4321, increases or decreases the amount of water entering the oil cooler 432, and maintains the lubricating oil pipeline temperature T2 value within the range of t3±2℃. When the lubricating oil pipeline temperature exceeds t4 or the water circuit temperature exceeds t5, an alarm signal is issued to remind the operator to check the cause of the fault and eliminate it.

[0077] S400, start the lubrication system, then the control center 2 sends a control command to the high-pressure jacking shaft module 6, and the high-pressure jacking shaft module 6 jacks up the rotor to prepare for the start of the unit 1;

[0078] Reference Figure 6, S410, the control center 2 controls the drainage pipe valve 621 in the high-pressure top shaft module 6 to open, and the lubricating oil in the oil supply pipeline 11 enters the high-pressure top shaft module 6 and exhausts the air in the high-pressure top shaft module 6. Since there is a check valve at the bottom of the oil suction pipe of the high-pressure oil pump 625, the air in the oil suction pipe of the oil pump can only be discharged back to the oil tank 12 through the oil pump vent pipe and the exhaust hole plate 624;

[0079] S420, the control center 2 starts the high-pressure oil pump 625 in the high-pressure jacking shaft module 6, the check valve at the bottom of the oil suction pipe of the high-pressure oil pump 625 opens, and the high-pressure oil pump 625 sucks oil from the oil tank 12 and pumps it to the bearing of the unit 1;

[0080] S430, the oil flow at the bearing is regulated by the high-pressure oil flow regulating valve 110 and the pressure compensation technology. The pressure switch on the oil outlet pipe of the high-pressure oil pump 625 detects the pressure of the high-pressure oil outlet pipe. The control center 2 sets the low-pressure threshold p7 and the high-pressure threshold p8 corresponding to the high-pressure pressure sensor P4. When the pressure is lower than p7, the high-pressure oil pump module 62 is started. When the pressure is higher than p8, the high-pressure oil pump module 62 is turned off.

[0081] Each bearing oil supply port is provided with a high-pressure oil flow regulating valve 110, which adopts pressure compensation flow regulation control technology, that is, a two-way flow control valve is selected for flow regulation. The two-way flow control valve is composed of a differential pressure reducing valve and a throttle valve in series, that is, the pressure difference between the inlet and outlet of the throttle valve is kept basically constant, so that the flow through the throttle valve is only related to the valve port opening, and has nothing to do with the load pressure fluctuation. The two-way flow control valve is selected for the lubricating oil system of unit 1, which can keep the flow constant and is not affected by pressure and temperature.

[0082] S500, the control center 2 starts the unit 1; after starting the unit 1, the energy storage control module 7 stores energy and balances the pressure of the oil supply pipeline 11;

[0083] Reference Figure 7 , S510, before the accumulator 71 is started, the oil circuit pressure is checked in advance by the oil circuit pressure sensor P11. If the oil circuit pressure is not zero, the control center 2 closes the energy storage oil circuit isolation valve 72 at the oil circuit inlet of the accumulator 71 and slowly opens the energy storage control valve 73 to discharge the pressure of the accumulator 71 to zero, and then slowly closes the energy storage control valve 73; if the oil circuit pressure is zero, it can be inflated;

[0084] S520, the control center 2 controls the gas circuit isolation valve 74 at the gas circuit inlet of the accumulator 71 to slowly open, and slowly inflate the gas end of the accumulator 71. At the same time, the gas circuit pressure sensor P12 detects the gas circuit pressure. When the gas circuit pressure rises to a preset value, the gas circuit isolation valve 74 is slowly closed, and the inflation is completed;

[0085] S530, the control center 2 slowly opens the energy storage oil circuit isolation valve 72, so that the energy storage device 71 is connected to the oil supply pipeline 11, the oil pressure is too high, the oil circuit compresses the gas circuit, the oil pressure decreases, and the gas circuit compensates for the oil pressure;

[0086] S540, at intervals of one month, the pressure on one side of the gas circuit of the accumulator 71 is detected by the gas circuit pressure sensor P12, and if it is lower than the set value, the accumulator 71 is inflated.

[0087] S600, the pressure control module 5 detects the pressure in the oil supply pipeline 11 and transmits the pressure data to the control center 2. The pressure detection unit 51 includes the oil supply pressure transmitter P1 at the front end of the oil cooler 432 and the pipeline pressure sensor P2 installed on the oil supply pipeline 11. The pressure processing unit 52 is provided with the normal oil supply pressure p1, the normal pipeline pressure p2 and the minimum pressure p3. If the oil supply is lower than p1, the bearing temperature will be high. If the oil supply is within the range of p2±0.02MPa, it is considered normal. If the oil supply is lower than p3, the bearing temperature will be high. The pressure processing unit 52 is connected to the pressure detection unit 51 to receive the pressure signal detected by the pressure detection unit 51 and start the backup oil supply module 14 and / or the DC oil supply module 15; when the pressure transmitter reading is lower than p1, the pressure processing unit 52 sends a "low pressure" signal, the backup oil supply module 14 is started, and the DC oil supply module 15 is interlocked at the same time; when the pressure reading of the pipeline pressure sensor P2 is lower than p3, the pressure processing unit 52 sends a "low pressure" signal, and the DC oil supply module 15 is interlocked.

[0088] S700, after running for a preset time, the test module 9 tests the main oil supply module 13, the backup oil supply module 14, the DC oil supply module 15 or the interlocking function.

[0089] Reference Figure 8 , S710, test the main oil supply module 13, any oil supply module other than the main oil supply module 13 is running, open the test solenoid valve 913 corresponding to the main oil supply module 13, test the orifice plate 911 to release pressure instantly, and the test pressure switch 912 sends a signal to the control center 2, and the control center 2 controls the main oil supply module 13 to start; the control center 2 checks the parameters of the AC oil pump in the main oil supply module 13 and compares them with normal values. When the test value is greater than the set value, the control center 2 outputs a signal that the main oil supply module 13 starts normally, and controls the corresponding test solenoid valve 913 to close, and closes the main oil supply module 13 after a delay of 10 seconds; when the test value is less than the set value, the main oil supply module 13 fault is output, and the operator is reminded to perform maintenance;

[0090] S720, testing the standby oil supply module 14 and the DC oil supply module 15 in sequence. When testing the standby oil supply module 14, any oil supply module other than the standby oil supply module 14 is in operation. When testing the DC oil supply module 15, any oil supply module other than the DC oil supply module 15 is in operation.

[0091] S730, test the interlocking function, the main oil supply module 13 or the backup oil supply module 14 is running, open the test solenoid valve 913 corresponding to the interlocking function test, the test pressure switch 912 sends a signal to the control center 2, the control center 2 controls the interlocking function to start, that is, the backup oil supply module 14 or the main oil supply module 13 that is a backup for each other is started. Since the main oil supply module 13 and the backup oil supply module 14 are backups for each other, their interlocking functions can be tested. The control center 2 checks the parameters of the AC oil pump and compares them with the normal values. When the test value is greater than the set value, the control center 2 outputs a normal signal for the backup oil supply module 14 or the main oil supply module 13 to start, and controls the corresponding test solenoid valve 913 to close, and closes the main oil supply module 13 after a delay; when the test value is less than the set value, the interlocking function fault is output to remind the operator to perform maintenance.

[0092] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent lubrication system for a shaft-type main engine, comprising a unit (1), an oil supply pipeline (11), an oil tank (12), a main oil supply module (13), a standby oil supply module (14) and a direct current oil supply module (15), wherein the main oil supply module (13), the standby oil supply module (14) and the direct current oil supply module (15) are all arranged on the oil tank (12), the main oil supply module (13), the standby oil supply module (14) and the direct current oil supply module (15) are connected to the oil supply pipeline (11), and the oil supply pipeline (11) is connected to a part to be lubricated of the unit (1); characterized in that: It also includes a control center (2), a liquid level control module (3), an oil temperature control module (4) and a pressure control module (5); The liquid level control module (3) comprises a liquid level detection unit (31) arranged on the oil tank (12) and a liquid level processing unit (32) arranged in the control center (2); the liquid level processing unit (32) is connected to the liquid level detection unit (31) to receive a liquid level signal detected by the liquid level detection unit (31) and control the start and stop of the main oil supply module (13), the standby oil supply module (14) and the DC oil supply module (15); The oil temperature control module (4) comprises an oil temperature detection unit (41) for detecting oil temperature, an oil temperature processing unit (42) arranged in the control center (2), and an oil temperature regulating unit (43) connected in series in the oil supply pipeline (11); the oil temperature processing unit (42) is connected to the oil temperature detection unit (41) to receive an oil temperature signal detected by the oil temperature detection unit (41) and control the oil temperature regulating unit (43) to regulate the oil temperature; The pressure control module (5) comprises a pressure detection unit (51) arranged on the oil supply pipeline (11) and a pressure processing unit (52) arranged in the control center (2); the pressure processing unit (52) is connected to the pressure detection unit (51) to receive a pressure signal detected by the pressure detection unit (51) and start the standby oil supply module (14) and / or the direct current oil supply module (15); The oil supply pipeline (11) is provided with at least one set of test modules (9) at the farthest bearing of the unit (1), and the test modules (9) are used to perform online testing on the working status of the main oil supply module (13), the backup oil supply module (14), the DC oil supply module (15) and the interlocking function; The test module (9) comprises a test control valve and four groups of test components (91), each group of test components (91) comprises a test orifice plate (911), a test pressure switch (912), a test solenoid valve (913), a test manual valve (914) and a return pipeline (915), the four test orifice plates (911) are respectively connected to the test control valve, the other end of the test orifice plate (911) is connected to the test solenoid valve (913), the test solenoid valve (913) is connected to the return pipeline (915), the return pipeline (915) is connected to the oil tank (12), and both ends of the test solenoid valve (913) are connected in parallel to the test manual valve (914); the test solenoid valve (913) is used to simulate pressure drop, and the control center (2) is coupled to the test pressure switch (912) to respond to the pressure signal from the test pressure switch (912) and control the corresponding main oil supply module (13), standby oil supply module (14), DC oil supply module (15) or start the interlocking function.

2. The intelligent lubrication system for rotating shaft type main engine according to claim 1, characterized in that: A high-pressure jacking shaft module (6) is connected between the oil temperature regulating unit (43) and the unit (1) in the oil supply pipeline (11). The high-pressure jacking shaft module (6) is controlled by the control center (2) to extract oil from the oil supply pipeline (11) to forcibly jack up the rotor before the unit (1) is started.

3. The intelligent lubrication system for rotating shaft type main machine according to claim 1, characterized in that: The oil supply pipeline (11) is also connected to an energy storage control module (7), and the energy storage control module (7) is controlled by the control center (2) to adjust the pressure of the oil supply pipeline (11).

4. The intelligent lubrication system for rotating shaft type main machine according to claim 1, characterized in that: A cleanliness detection module (8) is also connected to the oil supply pipeline (11), and the cleanliness detection module (8) is connected to the control center (2) to transmit cleanliness information of the lubricating oil obtained through detection to the control center (2).

5. The control method of the intelligent lubrication system for a main shaft of a rotating shaft according to claim 4, characterized in that: The following steps are involved: S100, build the unit lubrication system and connect various equipment; S200, the liquid level control module (3) detects the liquid level in the oil tank (12) and transmits the liquid level data to the control center (2), and when the liquid level is lower than the liquid level alarm point, the control center (2) controls the main oil supply module (13), the backup oil supply module (14) and the direct current oil supply module (15) to prohibit starting; S300, the oil temperature control module (4) detects the oil temperature and transmits the oil temperature data to the control center (2), and the control center (2) controls the lubrication system to prohibit starting and controls the oil temperature regulating unit (43) to increase the temperature when the oil temperature is lower than a preset low temperature, and controls the oil temperature regulating unit (43) to decrease the temperature when the oil temperature is higher than a preset high temperature; S400, starting the lubrication system, and then the control center (2) sends a control command to the high-pressure jacking shaft module (6), and the high-pressure jacking shaft module (6) jacks up the rotor to prepare for the start-up of the unit (1); S500, the control center (2) starts the unit (1); after the unit (1) is started, the energy storage control module (7) stores energy and balances the pressure of the oil supply pipeline (11); S600, the pressure control module (5) detects the pressure in the oil supply pipeline (11) and transmits the pressure data to the control center (2), and the control center (2) starts the backup oil supply module (14) and / or the direct current oil supply module (15) when the pressure changes beyond the floating range; S700: After running for a preset time, the test module (9) tests the main oil supply module (13), the backup oil supply module (14), the DC oil supply module (15) or the interlocking function.

6. The control method of the intelligent lubrication system for a main shaft of a rotating shaft according to claim 5, characterized in that: Step S400 also includes the following sub-steps: S410, the control center (2) controls the drainage pipe valve (621) in the high-pressure top shaft module (6) to open, so that the lubricating oil in the oil supply pipeline (11) enters the high-pressure top shaft module (6) and exhausts the air in the high-pressure top shaft module (6); S420, the control center (2) starts the high-pressure oil pump (625) in the high-pressure top shaft module (6), and the high-pressure oil pump (625) sucks oil from the oil tank (12) and pumps it to the bearing of the unit (1); S430, regulating the oil supply flow at the bearing by using a high-pressure oil flow regulating valve (110) and a pressure compensation technology.

7. The control method of the intelligent lubrication system for a main shaft of a rotating shaft according to claim 5, characterized in that: Step S500 also includes the following steps: S510, before the energy accumulator (71) is started, the oil circuit pressure is checked in advance. If the oil circuit pressure is not zero, the control center (2) closes the energy storage oil circuit isolation valve (72) at the oil circuit inlet of the energy accumulator (71) and slowly opens the energy storage control valve (73) to discharge the pressure of the energy accumulator (71) to zero. If the oil circuit pressure is zero, inflation can be carried out; S520, the control center (2) controls the gas circuit isolation valve (74) at the gas circuit inlet of the energy storage device (71) to slowly open and slowly inflate, and when the gas circuit pressure rises to a preset value, the gas circuit isolation valve (74) is slowly closed, and the inflation is completed; S530, the control center (2) slowly opens the energy storage oil circuit isolation valve (72) so that the energy storage device (71) is connected to the oil supply pipeline (11); S540: After a certain period of time, the pressure on one side of the gas path of the energy accumulator (71) is detected. If the pressure is lower than the set value, the energy accumulator (71) is inflated.

8. The control method of the intelligent lubrication system for a rotating shaft type main engine according to claim 5, characterized in that: Step S700 also includes the following sub-steps: S710, the main oil supply module (13) is tested, any oil supply module other than the main oil supply module (13) is operated, the test solenoid valve (913) corresponding to the main oil supply module (13) is opened, the test pressure switch (912) sends a signal to the control center (2), the control center (2) controls the main oil supply module (13) to start, the control center (2) checks the parameters of the AC oil pump in the main oil supply module (13) and compares them with normal values. When the test value is greater than the set value, the control center (2) outputs a signal indicating that the main oil supply module (13) is started normally, and controls the corresponding test solenoid valve (913) to close, and closes the main oil supply module (13) after a delay; when the test value is less than the set value, the main oil supply module (13) is output as faulty, and the operator is reminded to perform maintenance; S720, testing the standby oil supply module (14) and the direct current oil supply module (15) in sequence, when testing the standby oil supply module (14), any oil supply module other than the standby oil supply module (14) is in operation, and when testing the direct current oil supply module (15), any oil supply module other than the direct current oil supply module (15) is in operation; S730, the interlocking function is tested, the main oil supply module (13) or the backup oil supply module (14) is running, the test solenoid valve (913) corresponding to the interlocking function test is opened, the test pressure switch (912) sends a signal to the control center (2), the control center (2) controls the interlocking function to start, that is, the backup oil supply module (14) or the main oil supply module (13) that serves as a backup for each other is started, the control center (2) checks the parameters of the AC oil pump and compares them with normal values. When the test value is greater than the set value, the control center (2) outputs a signal indicating that the main oil supply module (13) is started normally, and controls the corresponding test solenoid valve (913) to be closed, and the main oil supply module (13) is closed after a delay; when the test value is less than the set value, an interlocking function fault is output to remind the operator to perform maintenance.

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