Maintenance of R15K551.1 coupler

Maintenance contents include the overall maintenance of equipment, pipeline inspection, replacement of vulnerable parts, equipment spare parts replacement and installation and commissioning projects

The coupler uses liquid oil as the working medium to change the kinetic energy of the liquid into mechanical energy through the pump wheel, and connects the motor with the working machine to realize the transmission of power. It has a no-load starting motor, stable stepless speed etc., for power plant feedwater pump speed regulation, can simplify the boiler feedwater control system, reduce the number of high pressure valve, because through the speed change water and pressure to meet the unit start stop and load change, good regulation characteristics, the valve pressure drop is small, line loss that is not easy to damage, so that the water supply system to reduce the fault, when the water pump jam and seizure occurs, the pump and motor can play a protective role. Therefore, in modern power plant, the boiler feed water pump of the unit generally adopts the speed regulating feed water pump with hydraulic coupling. The main components are: pump wheel, turbine, rotating shell, input shaft, output shaft and spoon pipe. Generally, the rotating housing and the pump wheel are bolted by flanges at the outer edge. Pump wheel and turbine wheel blades are called work, two, two are respectively connected with the input and output shaft, there is a gap between them, so the pump and turbine has the same radial size, cavity shape, together to form the oil chamber, the oil from the pump into the wheel, and follow the power machine rotates together, the role of oil under the centrifugal force, was thrown to the outside of the pump wheels, turbine blades forming high speed oil flow into the opposite direction, gradually slow down and flows back to the inside of the turbine inside the pump wheel, constitute an oil cycle. The absolute flow of the working fluid in the working chamber is a three-dimensional motion. The rotating housing is connected with the pump wheel and is enclosed outside the turbine, so that the working fluid can be stored in the pump wheel. The input shaft is connected to the power machine (such as the motor), and the output shaft is connected to the driven machine (such as a water pump). The characteristics of hydraulic coupler is to eliminate shock and vibration; the output speed is lower than the input speed, two speed difference increases with the increase of load; overload protection performance and good starting performance, while the load is too large to stop when the input shaft can rotate, not to damage the machine; when the load is reduced, the output shaft speed is increased until close to the speed of the input shaft, the transmission torque tends to zero. The transmission efficiency of hydraulic coupling is equal to the ratio of the output shaft speed to the input shaft speed. Higher efficiency can be obtained when the speed ratio of the general hydraulic coupler is more than 0.95. The characteristics of hydraulic couplings vary due to the shape of the working chamber, the pump wheel and the turbine. It is generally cooled by the shell and does not require external cooling. The transmission process of hydraulic coupling can be regarded as the process of resultant force.