Structure and functional characteristics
The high-pressure jacking oil pump P.SL63/45A uses an axial piston pump as the core power unit and has high-efficiency and high-precision oil supply capabilities. The system integrates dual pump redundant configuration (one for use and one for backup) to ensure the continuity of oil supply. At the same time, it is equipped with a two-stage oil filter device to filter tiny particles in the oil and ensure the cleanliness of the oil. A low-pressure controller is set on the inlet and outlet pipelines of the pump body to monitor the oil pressure status in real time: when the inlet pressure is lower than 0.05MPa, an early warning is triggered, and when it drops further to 0.02MPa, the motor power supply is automatically cut off to prevent the pump body from idling and damage.
The high-pressure oil output end is equipped with a modular manifold system, which supplies oil to each bearing through an independent branch. Each branch is equipped with a throttle valve and a one-way valve. The former is used to accurately adjust the lifting height of each bearing (usually the lifting amount is required to be within the range of 0.02-0.05mm), and the latter prevents oil reflux from causing pressure fluctuations. The manifold safety valve is set to the maximum allowable pressure threshold of the system, and automatically releases when overpressure occurs to avoid the risk of pipeline overload.
Operation control logic
When the system starts, the oil pump sucks lubricating oil from the outlet of the oil cooler, and enters the plunger pump for pressurization after preliminary purification by the filter. The output pressure can reach more than 45MPa (specific parameters need to be adjusted according to the unit model). The high-pressure oil is distributed to the oil bags of each bearing through the throttle valve to form a uniform oil film to support the rotor. After the lifting height of all bearings meets the standard, the turning device can be put into use. The local pressure gauge displays the oil pressure of each branch in real time, and cooperates with the data acquisition system of the central control room to realize visual monitoring of the entire process.
Application scenarios and advantages
high-pressure jacking oil Pump P.SL63/45A is mainly suitable for the low-pressure rotor bearing system of the steam turbine, and plays a key role in the cold start, shutdown and low-speed cranking stages of the unit. Compared with traditional lubrication methods, its technical advantages are reflected in:
1. Friction control optimization: through precise oil film formation, sliding friction is converted into liquid friction, reducing the starting torque by more than 60%;
2. Vibration suppression: eliminate the dry friction between the journal and the bearing, and avoid structural damage caused by blade resonance;
3. System reliability: dual pump redundancy, multiple protection mechanisms and modular design significantly reduce the probability of unplanned downtime;
4. Maintenance convenience: The filter quick-disassembly structure design supports online cleaning or replacement, shortening the maintenance window time.
Maintenance and adaptation suggestions
Regularly check the filter blockage (it is recommended to clean or replace it every 2000 hours of operation), monitor the decreasing trend of the plunger pump volumetric efficiency, and calibrate the pressure controller action value in time. For medium and high pressure rotor systems using tilting pad bearings, it is necessary to evaluate the adaptability of the jacking oil system according to actual working conditions. It is recommended to conduct a system pressure-flow characteristic test during the annual overhaul to ensure that the oil pump performance meets the operating requirements of the unit throughout its life cycle.
high-pressure jacking oil Pump P.SL63/45A Details
