AUTHORS: Li Shuangxi, Sun Xiandong, Zhang Peng, Cai Jining, Wang Liang

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ABSTRACT: Either barrier fluid pressure constant (BFPC) or barrier fluid differential-pressure constant (BFDPC) is applied for kettle mechanical seals (KMS), large differential-pressure could inevitably appear near the seal faces, resulting in the seal faces deformation and non-uniform contact, aggravating the seal faces wear. In this paper, the maximum seal faces contact pressure under the condition of before wear (BW) and after stable wear (ASW) were calculated by fluid-structure interaction finite element model. Calculating results show that the maximum contact pressure of ASW is lower than that of BW more than 90% for BFPC and BFDPC applied in KMS. In order to study the seal faces wear status under the two kinds of means to elevate barrier fluid pressure, the ratios of the maximum pcV values (pcV)max and allowable pcV values ( [pcV] ) of the sealing pair were calculated. Calculating results indicate that the process end seal faces for BFPC applied in KMS, the process end and the atmospheric side seal faces for BFDPC applied in KMS were in alternating wear status, the atmospheric side seal faces for BFPC applied in KMS were in stable wear status. In order to validate the numerical calculation results, verification tests were performed and the friction torques for BFPC applied in KMS were obtained, which were in a good accordance with the calculating results.

KEYWORDS: wear status, contact pressure, pcV values, mechanical seal, non-uniform contact

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