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护环是汽轮发电机的关键部件。在电机高速运转时为了防止转子上的绕组在经向运动,把护环热套冷缩在转子的瑞部上。目前,常规的护环是由冷加工的18MnCr5奥氏体反磁钢制成的,重量均为1814～2268kg,屈服强度大约是12564kgf/cm~2(1232N/mm~2)。电机在运行时,护环除了承受自身的巨大离心力外,还要承受转子端部线圈重量产生的离心力、护环和转子的温差及热膨胀系数不同而产生的热应力和弯曲交变应力等。另外电机的负载转动惯量大,短期内转子的温度可达130℃。要求护环不受损坏,停机后又能恢复原状。同时当电机在运行和超速运转时护环和转子绝对不允许出现相对滑动,因此要求护环与转子有合适的紧配力。
Guard ring is a key component of turbine generator. In the motor high-speed operation in order to prevent the rotor winding in the meridional movement, the guard ring shrink sleeve on the rotor Rui Department. Currently, the conventional grommet is made of cold-worked 18MnCr5 austenitic anti-magnetic steel with a weight of 1814 to 2268 kg and a yield strength of about 12,564 kgf / cm 2 (1232 N / mm 2). In operation, the guard ring not only withstands its own huge centrifugal force, but also withstand the centrifugal force generated by the weight of the coil at the end of the rotor, the thermal stress and the bending alternating stress caused by the temperature difference and the thermal expansion coefficient between the guard ring and the rotor. In addition the motor load moment of inertia, the rotor temperature in the short term up to 130 ℃. Required guard ring from damage, stop and then restore the status quo. At the same time when the motor is running and speeding operation of the guard ring and the rotor is absolutely not allowed to appear relative sliding, so the guard ring and the rotor have the right tightening force.