聚四氟乙烯波纹管型机械密封具有耐腐蚀的优点,近来在工业生产中已取得了较为满意的成果。根据聚四氟乙烯波纹管的结构特点,设计波纹管型机械密封时,按沿用的计算公式P_比=P_弹+(K-λ)P_介(1) 计算端面比压,势必要考虑一个重要的参数——聚四氟乙烯波纹管有效作用直径。它的精确度对端面比压影响很大。以152—55型耐腐蚀机械密封为例,在密封介质的压力为 PTFE bellows-type mechanical seal has the advantages of corrosion resistance, has recently been in industrial production has achieved more satisfactory results. According to the structural characteristics of PTFE bellows, bellows mechanical seal design, according to the following formula P_ = P_ bomb = (K-λ) P_ (1) to calculate the end pressure, it is necessary Consider an important parameter - polytetrafluoroethylene bellows effective diameter. Its accuracy has a great influence on the specific pressure of the end face. To 152-55 type corrosion-resistant mechanical seal, for example, the pressure of the sealing medium is