How does the electric turning device of a steam turbine operate?
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I need help – how does the electric barring device in a centrifugal steam turbine work? Also, I’m not sure what purpose each type of oil serves. . .
Hydraulic turning device! ! Send a signal to the turning motor, and the shaft can be turned! !
It’s a hydraulic turntable, not electric.
Starting the turning gear enables automatic turning. The lubricating oil is pressurized by a lubricating oil pump; its pressure is regulated by a self-acting control valve before it enters the oil cooler, and then the oil filter. After passing through the filter, a small portion of the oil is used as control oil to supply the governor, quick-shut valves, accumulator, and crankshaft turning device ； The other portion of the lubricating oil, whose pressure is regulated to 0.25 MPa (G) by a self-acting control valve, flows to the bearing lubrication surfaces of the high-pressure and low-pressure cylinders of the turbine and compressor respectively, while the return oil returns to the lubricating oil tank via the return oil main pipe.
I see a turning motor under the control column of the winch; what is that motor used for? I just can’t figure out those oil lines related to the crankshaft turning device
There are generally two types of turbine barring mechanisms: one is a purely electric barring mechanism (commonly used in Qingdao Jieneng turbines), which relies on worm gears and meshing gears for transmission； Another type consists of hydraulic oil and a directional control valve, and it uses a push rod to rotate the ratchet teeth on the main shaft (commonly used in Hangzhou-based vehicles). The one the poster is referring to is likely the second type; there are many posts on this topic available for searching in the forum.