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一、前言护环是汽轮发电机的重要部件之一。它是用以箍紧发电机转子绕组端部的紧固件。在运行过程中,除承受被箍紧的绕组端部的应力外,还承受护环本身在高速旋转时所产生的离心力。在绝大多数设计中,护环是承应力最高的部件。如对2.5万瓩的汽轮发电机,护环在旋转时所承受的应力为42kgf/mm~2,10万瓩的为51kgf/mm~2,60万瓩为70kgf/mm~2。近年来,随着汽轮发电机组日益趋向大型化,对护环材料强度提出愈来愈高的要求。此外,为了减少涡流损失,还要求护
I. Introduction Ring guard is one of the important components of a turbo-generator. It is used to tighten the generator rotor winding the end of the fastener. In operation, in addition to the end of the hoop to withstand the stress of the winding, but also to withstand the ring when the ring itself at high speed centrifugal force generated. In most designs, the retaining ring is the most stress-tolerant component. For 25,000 tons of turbine generators, the retaining ring in the rotation of the stress is 42kgf / mm ~ 2,10 million 瓩 of 51kgf / mm ~ 2,60 million 瓩 70kgf / mm ~ 2. In recent years, with the increasingly large-scale steam turbine generating units, the strength of the retaining ring material put forward higher and higher requirements. In addition, in order to reduce eddy current loss, but also care