The basic situation of the induced draft fan unit is driven by a single-stage steam turbine, and the sliding bearing of the unit is lubricated by forced oil supply. The gear oil pump in the oil station is driven by the motor, and is sent to the lubrication points of the unit through the oil filter and the cooler, and is connected with the oil brake of the quick-closing valve through the three-way electromagnetic valve. The front end support bearing of the induced draft fan is subjected to radial load, and the end support bearing is subjected to radial load and axial load. The fan shaft material is 35CrMo, the bearing journal diameter is 175mm, the main shaft length is 4055mm, and the two support points span 3400mm.
Problems in the fuel supply system of the unit In the case of high-load production, the turbine speed of the induced draft fan unit is 4200r/min, and the fan speed is 929r/min. The gear pump driven by the motor station motor is stopped due to electrical failure. When the lubricating oil pressure is lower than 0.03MPa, the piston of the quick closing valve cylinder should be retracted, and the speed closing valve is closed. The actual situation is that the reliability of the quick-closing valve is low, and when the valve is operated, there is a phenomenon that the closing is not strict, the delay and the non-action occur.
Since the speed shut-off valve does not close the steam entering the turbine in time, the fan continues to rotate under the action of the huge inertial force, which causes the oil leakage of the unit sliding bearing, the severe wear of the rotor journal, the deceleration of the reduction gear, and the damage of the oil seal. normal production. However, the method needs to be dismantled and opened, which has a large workload, long maintenance time and high cost. This time, the method of installing the output shaft on the spot is adopted. The key is how to ensure the concentric requirements of the two axes. The fan supports the bearing block on the upper dial gauge, and checks the radial runout value of the matching part between the free end of the fan shaft and the output shaft.
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Each type of lock is built differently, but let`s take a look at the anatomy of a typical door lock usually used in homes or light commercial buildings. The main parts of a door lock are the cylinder, bolt, box and strike plate.
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