A turbine bearing lubrication device

Abstract

This invention discloses a turbine bearing lubrication device, relating to the field of power plant equipment technology. It includes an oil tank, a main engine oil pump and a standby oil pump connected in parallel, a dual-switch filter, a cooler, and a main oil supply pipe connected in sequence. A pressure-reducing and stabilizing valve, an accumulator, and an oil supply pressure sensor are sequentially installed on the main oil supply pipe. A heater is located inside the oil tank or on the cooler's oil outlet pipe. A temperature sensor is located on the main oil supply pipe or at the bearing oil inlet. A controller is electrically connected to the temperature sensor, the heater, and the cooling water regulating valve. This invention uses a temperature sensor to collect oil temperature in real time, and the controller automatically adjusts the opening of the cooling water regulating valve and the start / stop of the heater to achieve automatic and precise oil temperature control, stabilizing it within ±1℃ of the set value. This ensures optimal lubricating oil viscosity and solves the problem of oil film instability caused by oil temperature fluctuations.

Description

Technical Field

[0001] This invention relates to the field of power plant equipment technology, and specifically to a turbine bearing lubrication device. Background Technology

[0002] As a core power source in thermal power generation and industrial drive, the turbine's bearing system endures harsh operating conditions of high temperature, high speed, and heavy load. The function of the bearing lubrication system is to continuously supply clean, appropriately priced, and stably pressurized lubricating oil to the bearing, forming an oil film between the journal and the bearing bush to reduce friction, dissipate heat, prevent wear, and ensure the safe and stable operation of the turbine.

[0003] Existing turbine bearing lubrication systems typically consist of an oil tank, oil pump, filter, cooler, and piping, which can generally meet lubrication requirements under normal operating conditions. However, in actual long-term operation, the existing systems have revealed the following technical problems that urgently need to be addressed: First, inaccurate oil temperature control. During turbine operation, the load fluctuates frequently, causing significant changes in the heat generated by the bearings. Conventional coolers often rely on manual adjustment of cooling water flow, resulting in slow response times and difficulty in maintaining the oil temperature stably within the optimal viscosity range of 40-45 degrees Celsius. Excessively high oil temperature leads to decreased lubricating oil viscosity and weakened oil film strength; conversely, excessively low oil temperature increases viscosity, raises flow resistance, and increases oil pump power consumption. Both of these conditions negatively impact lubrication, and in severe cases, can even cause bearing failure.

[0004] Secondly, filter maintenance affects continuous operation. Traditional lubrication systems mostly use single-cylinder filters. When the filter element becomes clogged to its limit, the system must be shut down for replacement. For industrial steam turbines that require long-term continuous operation, unplanned shutdowns will cause significant power generation losses or production interruptions. Although some systems have two filters connected in parallel for backup, the switching operation is complex, relies on manual experience, and is prone to oil supply interruptions due to misoperation, posing safety hazards.

[0005] Third, the oil supply pressure fluctuates greatly. The oil pump outlet pressure fluctuates constantly with changes in oil temperature and increased filter element resistance, while the bearing inlet requires a stable oil supply pressure to maintain the oil film thickness. Existing devices generally lack a fast-response pressure regulation mechanism, and pressure fluctuations are directly transmitted to the bearing, disrupting oil film stability and leading to increased bearing vibration and shortened lifespan.

[0006] Fourth, there is a lack of condition monitoring and early warning capabilities. Key parameters such as the particulate matter content, moisture content, and oil temperature change trends in lubricating oil cannot be obtained in real time. Operators often only discover problems when the bearing temperature rises abnormally or vibration exceeds the standard. By then, irreversible damage has often already occurred inside the bearing, resulting in high maintenance costs.

[0007] In summary, existing technologies are insufficient to meet the multiple requirements of precise oil temperature control, non-stop maintenance, pressure stability, and condition monitoring. Summary of the Invention

[0008] In view of this, the present invention provides a turbine bearing lubrication device that can automatically control oil temperature, achieve filter switching without shutdown, stabilize oil supply pressure, and has online status monitoring function, so as to overcome the above problems.

[0009] The present invention provides a turbine bearing lubrication device, comprising: Oil tank, used to store lubricating oil; The main oil pump and the standby oil pump are connected in parallel, and their oil suction ports are both connected to the oil tank. A dual-switch filter, the oil inlet of which is connected to the oil outlet of the main oil pump and the standby oil pump respectively; The cooler has its oil inlet connected to the oil outlet of the dual-switching filter; A heater is installed inside the oil tank or on the oil outlet pipe of the cooler; The main oil supply pipe has its inlet connected to the outlet of the cooler. A pressure reducing and stabilizing valve, an accumulator, and an oil supply pressure sensor are sequentially installed on the main oil supply pipe. The outlet of the main oil supply pipe is used to connect to the inlet of the turbine bearing. The oil return main pipe has an inlet for connecting to the outlet of the turbine bearing, and the outlet of the oil return main pipe is connected to the oil tank. A temperature sensor is installed on the main oil supply pipe or at the bearing oil inlet. The controller is electrically connected to the temperature sensor, the heater, and the cooling water regulating valve of the cooler, respectively, and is used to control the operation of the heater and the cooling water regulating valve according to the temperature signal from the temperature sensor.

[0010] In the above solution, the oil supply temperature is collected in real time by a temperature sensor. The controller automatically adjusts the opening of the cooling water regulating valve and the start / stop of the heater based on the temperature signal, achieving automatic and precise control of the oil temperature. This stabilizes the oil temperature within ±1℃ of the set value, ensuring that the lubricating oil viscosity is always at its optimal state, fundamentally solving the problem of oil film instability caused by oil temperature fluctuations. Simultaneously, the online monitoring unit can provide real-time feedback of oil quality data to assist in judging the temperature control effect.

[0011] The upstream fluctuating pressure is stabilized at the set value by the pressure regulating valve, and the accumulator further absorbs the small pressure shocks caused by oil pump pulsation and sudden load changes. This dual protection keeps the oil supply pressure fluctuation within a very small range. At the same time, the outlet pressure switch is linked with the controller to automatically activate the standby oil pump when the pressure of the main oil pump is insufficient, maintaining the stability of the pump outlet pressure from the source and ensuring the continuity and stability of the bearing oil film.

[0012] Optionally, the dual-switch filter includes two filter cartridges connected in parallel and a six-way switching valve. When the pressure difference of one filter cartridge reaches a set value, the six-way switching valve can switch to the other filter cartridge.

[0013] Optionally, each of the filter cartridges is equipped with a differential pressure transmitter, which sends an alarm signal when the differential pressure of the filter cartridge reaches a set value.

[0014] The dual-switch filter, combined with a differential pressure transmitter, enables automatic alarm for filter element clogging and uninterrupted online switching. Operators simply rotate the six-way switching valve to direct oil flow to the other filter cartridge; the clogged cartridge can be removed and replaced without shutting down the system, completely eliminating unplanned downtime. Simultaneously, the main oil pump and standby oil pump are connected in parallel for mutual backup, further ensuring continuous oil supply to the filtration unit and during maintenance.

[0015] Optionally, the cooling water inlet pipe of the cooler is equipped with the cooling water regulating valve, and the cooling water outlet pipe is equipped with a manual bypass valve.

[0016] Optionally, the cooler is a shell-and-tube heat exchanger or a plate heat exchanger, and the heater is an electric heating rod disposed at the bottom or side wall of the oil tank.

[0017] Optionally, the main oil supply pipe is also equipped with a flow meter and an online oil monitoring unit, which includes a particle counter and a moisture sensor.

[0018] Optionally, the return oil main is equipped with a return oil temperature sensor and a return oil pressure sensor.

[0019] The lubricating oil's cleanliness level and water content are monitored in real time using a particle counter and moisture sensor. Bearing operating status is monitored using return oil temperature and pressure sensors. All data can be uploaded to the controller or DCS system. An early alarm is triggered when cleanliness exceeds the standard or water content is too high, indicating filter element failure or shaft seal leakage, thus shifting from reactive maintenance to predictive maintenance. Furthermore, baffles and filters within the oil tank perform preliminary filtration of the return oil and remove air bubbles, further ensuring long-term oil quality stability and reducing the load on the condition monitoring unit.

[0020] Optionally, it also includes: The high-level emergency oil tank has its inlet connected to the main oil supply pipe, and a normally closed solenoid valve is installed on the connecting pipe. The outlet of the high-level emergency oil tank is directly connected to the inlet of the turbine bearing through a gravity oil supply pipe, and a manual shut-off valve is installed on the gravity oil supply pipe. When both the main oil pump and the standby oil pump fail, the normally closed solenoid valve opens, and the lubricating oil in the high-level emergency oil tank is supplied to the bearing by gravity.

[0021] Optionally, both the main oil pump and the standby oil pump are equipped with a check valve and an outlet pressure switch on their outlet pipes; the outlet pressure switch is electrically connected to the controller, and the controller automatically starts the standby oil pump when the outlet pressure of the main oil pump is lower than the set value.

[0022] Optionally, the oil tank is equipped with an oil level gauge, an air filter, a drain valve, and an oil mist separator; the oil tank is equipped with a partition to divide the oil tank into an oil return zone and an oil suction zone, and the partition is equipped with a filter screen.

[0023] The technical solution of this invention has the following advantages: 1. Intelligent oil temperature control ensures optimal lubrication: A closed-loop control circuit is formed by a temperature sensor, cooling water regulating valve, and heater. Based on real-time oil temperature, the cooling water flow and heater operation are automatically adjusted, precisely stabilizing the oil supply temperature within ±1℃ of the set value. This design ensures the lubricating oil film strength is always at its optimal level, effectively reducing bearing wear and significantly extending bearing life.

[0024] 2. Online switching of dual filters enables maintenance without shutting down the system: A dual-switching filter system with a differential pressure indicator is used. When one set of filter elements becomes clogged to the set differential pressure, the differential pressure indicator sends an alarm signal. The operator only needs to rotate the six-way switching valve to switch to the other set of filter elements online. This process can be completed while the turbine is running normally, avoiding unplanned downtime and significantly improving equipment utilization.

[0025] 3. Stable and reliable oil supply pressure: A pilot-operated pressure reducing and stabilizing valve is installed between the oil pump outlet and the bearing oil supply port, and is used in conjunction with an accumulator. The pressure reducing and stabilizing valve stabilizes the upstream fluctuating pressure, and the accumulator further absorbs small pressure fluctuations caused by oil pump pulsation and sudden load changes, which can control the oil supply pressure fluctuation within ±0.02MPa, effectively ensuring the stability and continuity of the bearing oil film.

[0026] 4. Multiple safety protections to prevent oil shortage accidents: A standby oil pump and outlet pressure switch interlock mechanism is set up. When the main oil pump fails, the backup pump will automatically start to ensure uninterrupted oil supply. At the same time, a high-level emergency oil tank is configured. In extreme cases of power failure or failure of both pumps, the bearing can be continuously supplied with oil by gravity for 3 to 5 minutes, providing sufficient protection time for the turbine coasting shutdown and completely eliminating oil shortage and bearing failure accidents.

[0027] 5. Online condition monitoring for predictive maintenance: Integrating online oil monitoring units such as a particle counter and moisture sensor, the system monitors the cleanliness level and water content of the lubricating oil in real time and can transmit the data to the DCS system. This design can provide early warnings of potential failure trends such as filter clogging and oil deterioration, transforming equipment maintenance from reactive repair to proactive prevention and reducing operation and maintenance costs.

[0028] 6. Compact structure and easy maintenance: Each functional unit adopts a modular design, and the pipeline connection adopts a flange or compression fitting structure. The layout is reasonable, disassembly is convenient, and maintenance space is sufficient, which greatly reduces the workload and time cost of daily maintenance. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a front view of a turbine bearing lubrication device provided in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures 1. Oil tank; 2. Main oil pump; 3. Standby oil pump; 4. Dual-stage switching filter; 41. Filter cartridge; 42. Six-way switching valve; 43. Differential pressure transmitter; 5. Cooler; 6. Heater; 7. Main oil supply pipe; 8. Pressure reducing and stabilizing valve; 9. Accumulator; 10. Oil supply pressure sensor; 11. Main oil return pipe; 12. Temperature sensor; 13. Controller; 14. Cooling water regulating valve; 15. Flow meter; 16. Online oil monitoring unit; 1. Laser particle counter; 162. Capacitive moisture sensor; 17. Return oil temperature sensor; 18. Return oil pressure sensor; 19. High-level emergency oil tank; 20. Normally closed solenoid valve; 21. Gravity oil supply pipe; 22. Manual shut-off valve; 23. Check valve; 24. Outlet pressure switch; 25. Oil level gauge; 26. Air filter; 27. Drain valve; 28. Oil mist separator; 29. ​​Baffle plate; 30. Filter screen; 100. Steam turbine bearing.

[0032] The dashed lines in the diagram represent electrical connections or control signal lines. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Reference Figure 1 As shown, this is a specific implementation of the turbine bearing lubrication device provided in this embodiment, which includes: an oil tank 1, an oil supply circuit, an oil return circuit, a temperature control circuit, a pressure stabilization circuit, and a safety protection unit.

[0038] The oil tank 1 is made of stainless steel and has an effective volume of 2 cubic meters. Internally, a vertical partition 29 divides the tank into a return oil zone and an intake oil zone. An overflow port with a 100-mesh stainless steel filter 30 is installed at the top of the partition 29 to allow air bubbles in the return oil to escape and to initially intercept large particles of impurities. An oil level gauge 25, an air filter 26, and an oil mist separator 28 are installed on the top of the tank, while a drain valve 27 is located at the bottom. An electric heater 6 with a power of 15 kilowatts is installed on the side wall of the tank to heat the lubricating oil to above 35 degrees Celsius during low-temperature startup.

[0039] Both the main oil pump 2 and the standby oil pump 3 are screw pumps with a rated flow rate of 200 liters per minute and a rated pressure of 1.0 MPa, and are installed in parallel on the side of the oil tank 1. The suction pipes of the two pumps are inserted into the suction area, and the outlet pipes are respectively equipped with a check valve 23 and an outlet pressure switch 24. The outlets of the two pumps are combined and connected to the inlet of the dual-switch filter 4.

[0040] The dual-switch filter 4 includes two independently replaceable filter cartridges 41 with a filter element precision of 10 microns. A six-way switching valve 42 can be manually rotated to direct oil flow to either filter cartridge 41. Each filter cartridge 41 is equipped with a differential pressure transmitter 43 at its top. When filter element blockage causes the differential pressure to reach 0.15 MPa, the differential pressure transmitter 43 issues an audible and visual alarm. The operator can then rotate the six-way switching valve 42 to switch to the other filter cartridge 41, and then remove the blocked filter cartridge 41 to replace the filter element without stopping the oil supply.

[0041] Oil from the dual-switching filter 4 enters the plate cooler 5. A cooling water regulating valve 14 is installed on the cooling water inlet pipe of the cooler 5, and a manual bypass valve is installed on the outlet pipe. A temperature sensor 12 is installed on the main oil supply pipe 7. The controller 13 reads the temperature signal: when the oil temperature is higher than 45 degrees Celsius, it gradually opens the cooling water regulating valve 14; when the oil temperature is lower than 38 degrees Celsius, it closes the cooling water regulating valve 14 and starts the heater 6; when the oil temperature is between 38 and 45 degrees Celsius, it maintains the current state.

[0042] Oil from the cooler 5 flows into the main oil supply pipe 7. The main oil supply pipe 7 is sequentially equipped with a pressure reducing and regulating valve 8, an accumulator 9, and an oil supply pressure sensor 10. The pressure reducing and regulating valve 8 is pilot-operated, with an outlet pressure set at 0.25 MPa, stabilizing upstream pressure fluctuations of 0.4 to 0.8 MPa at 0.25 ± 0.02 MPa. The accumulator 9 is a pneumatic type with a volume of 10 liters, further absorbing small pressure fluctuations caused by oil pump pulsation and sudden changes in bearing load.

[0043] In some embodiments, the main oil supply pipe 7 branches into two paths: one path connects to the oil inlet of the turbine bearing 100; the other path connects to the oil inlet of the high-level emergency oil tank 19, with a normally closed solenoid valve 20 installed in between. The high-level emergency oil tank 19 is installed 3 meters above the bearing centerline, and its oil outlet is also connected to the bearing oil inlet via a gravity oil supply pipe 21, which is equipped with a manual shut-off valve 22. Under normal circumstances, the normally closed solenoid valve 20 is closed; when the outlet pressure of both the main oil pump 2 and the standby oil pump 3 is lower than 0.15 MPa, the controller 13 automatically opens the normally closed solenoid valve 20, and the lubricating oil in the high-level oil tank 1 flows into the bearing by gravity, which can maintain the oil supply for 3 to 5 minutes, buying time for the turbine to shut down safely.

[0044] The bearing return oil flows back to the return oil zone of the oil tank 1 via the return oil main pipe 11. A return oil temperature sensor 17 and a return oil pressure sensor 18 are installed on the return oil main pipe 11 to determine the bearing's operating status. The oil supply main pipe 7 is also equipped with a flow meter 15 and an online oil monitoring unit 16. The online oil monitoring unit 16 includes a laser particle counter 161 and a capacitive moisture sensor 162, which can output the lubricating oil NAS1638 cleanliness (contamination level) and water content percentage in real time. An alarm is triggered when the cleanliness exceeds NAS 9 or the water content is higher than 0.1%, indicating filter failure or shaft seal leakage.

[0045] It should be noted that NAS1638 (American Aerospace Standard) classifies oil samples according to the maximum number of particles in 5 particle sizes per 100 mL of oil sample, with a total of 14 grades: 00, 0, 1 to 12; the smaller the number, the cleaner the oil.

[0046] Work process Before starting, check the oil level and temperature in oil tank 1. If it is below 20 degrees Celsius, start heater 6 for preheating. Start the main oil pump 2. The lubricating oil is filtered by the dual-switch filter 4, temperature controlled by cooler 5, and pressure stabilized by pressure reducing valve 8 before being sent to the bearing. The return oil flows back to oil tank 1 by gravity. During operation, controller 13 automatically maintains the oil temperature. When the main oil pump 2 fails, outlet pressure switch 24 is triggered, and standby oil pump 3 automatically starts. When the filter element is clogged, differential pressure transmitter 43 alarms, and the operator switches filter cartridge 41 and replaces the filter element online. In extreme cases of power failure or failure of both pumps, normally closed solenoid valve 20 opens, and high-level emergency oil tank 19 supplies oil by gravity to ensure bearing safety.

[0047] Field tests showed that the device can stabilize the bearing oil temperature at 40±1 degrees Celsius, with oil pressure fluctuations of less than ±0.015 MPa. It operated continuously for 8,000 hours without any abnormal bearing temperature, and the oil supply was uninterrupted during the switching process of the dual filters. The gravity emergency system successfully supplied oil for 4 minutes and 20 seconds in a simulated power outage test, fully meeting the requirements for turbine coasting shutdown.

[0048] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A turbine bearing lubrication device, characterized in that, include: Oil tank (1) is used to store lubricating oil; The main oil pump (2) and the standby oil pump (3) are connected in parallel, and their oil suction ports are connected to the oil tank (1); The dual-switch filter (4) has its inlet connected to the outlet of the main oil pump (2) and the standby oil pump (3), respectively. The cooler (5) has its oil inlet connected to the oil outlet of the dual-switching filter (4); The heater (6) is installed inside the oil tank (1) or on the oil outlet pipe of the cooler (5); The oil supply main pipe (7) has its oil inlet connected to the oil outlet of the cooler (5). The oil supply main pipe (7) is equipped with a pressure reducing and stabilizing valve (8), an accumulator (9), and an oil supply pressure sensor (10) in sequence. The oil outlet of the oil supply main pipe (7) is used to connect to the oil inlet of the turbine bearing (100). The oil return main pipe (11) has an oil inlet for connecting to the oil outlet of the turbine bearing (100), and the oil outlet of the oil return main pipe (11) is connected to the oil tank (1). Temperature sensor (12) is installed on the main oil supply pipe (7) or at the bearing oil inlet; The controller (13) is electrically connected to the temperature sensor (12), the heater (6), and the cooling water regulating valve (14) of the cooler (5), respectively, and is used to control the operation of the heater (6) and the cooling water regulating valve (14) according to the temperature signal of the temperature sensor (12).

2. The turbine bearing lubrication device according to claim 1, characterized in that, The dual-switch filter (4) includes two parallel filter cartridges (41) and a six-way switching valve (42). When the pressure difference of one of the filter cartridges (41) reaches a set value, the six-way switching valve (42) can switch to the other filter cartridge (41) for operation.

3. The turbine bearing lubrication device according to claim 2, characterized in that, Each of the filter cartridges (41) is equipped with a differential pressure transmitter (43). When the differential pressure of the filter cartridge (41) reaches a set value, the differential pressure transmitter (43) sends out an alarm signal.

4. The turbine bearing lubrication device according to claim 1, characterized in that, The cooling water inlet pipe of the cooler (5) is equipped with the cooling water regulating valve (14), and the cooling water outlet pipe is equipped with a manual bypass valve.

5. A turbine bearing lubrication device according to claim 4, characterized in that, The cooler (5) is a shell-and-tube heat exchanger or a plate heat exchanger, and the heater (6) is an electric heating rod, which is located at the bottom or side wall of the oil tank (1).

6. A turbine bearing lubrication device according to claim 1, characterized in that, The main oil supply pipe (7) is also equipped with a flow meter (15) and an online oil monitoring unit (16), which includes a particle counter and a moisture sensor.

7. A turbine bearing lubrication device according to claim 6, characterized in that, The return oil main pipe (11) is equipped with a return oil temperature sensor (17) and a return oil pressure sensor (18).

8. A turbine bearing lubrication device according to any one of claims 1-7, characterized in that, Also includes: The high-level emergency oil tank (19) has its oil inlet connected to the main oil supply pipe (7) and a normally closed solenoid valve (20) is provided on the connecting pipe. The oil outlet of the high-level emergency oil tank (19) is directly connected to the oil inlet of the turbine bearing (100) through the gravity oil supply pipe (21). A manual shut-off valve (22) is provided on the gravity oil supply pipe (21). When both the main oil pump (2) and the standby oil pump (3) fail, the normally closed solenoid valve (20) opens, and the lubricating oil in the high-level emergency oil tank (19) is supplied to the bearing by gravity.

9. A turbine bearing lubrication device according to any one of claims 1-7, characterized in that, The main oil pump (2) and the standby oil pump (3) are equipped with a one-way valve (23) and an outlet pressure switch (24) on their outlet pipes. The outlet pressure switch (24) is electrically connected to the controller (13). When the outlet pressure of the main oil pump (2) is lower than the set value, the controller (13) automatically starts the standby oil pump (3).

10. A turbine bearing lubrication device according to any one of claims 1-7, characterized in that, The oil tank (1) is equipped with an oil level gauge (25), an air filter (26), a drain valve (27), and an oil mist separator (28); the oil tank (1) is equipped with a partition (29) inside, which divides the oil tank (1) into an oil return zone and an oil suction zone, and the partition (29) is equipped with a filter screen (30).

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