세탁기용 고무 회전 씨일의 밀봉 성능에 관한 연구

Abstract

RD Revised May 8, 2015; Accepted May 11, 2015)Abstract − In this research, we experimentally investigated the sealing performance of elastomeric rotary lipseals for washing machines. In general, NBR is used as a material for elastomeric rotary lip seals in washingmachines, but the mixing formula of the rubber material can affect the sealing performance. In this study, wemanufactured rotary lip seals using three kinds of NBRs with a different mixing formula, and examined the seal-ing performance using an acceleration test mode. The results of an SEM investigation into the surfaces of threekinds of specimens showed a much smaller wear volume and better sealing performance for the specimens withsmaller particle sizes of mixing composition than for the specimen with the larger. Repeated deformation andrecovery by the shaft-to-seal eccentricity on rotation were shown to cause a phase difference in the rubber mate-rial, and we measured the recovery ratio to find the influence of this phase difference on the sealing performance.As another method for checking the phase difference, we also measured tan a, and a lower tan a was revealedas the recovery ratio increased for each specimen. Specimens with a higher recovery ratio (lower tan a) wereshown to have a better sealing performance. Consequently, specimens with a smaller particle size in the mixingcomposition had a better sealing performance because they show a higher recovery ratio.Keywords − NBR(니트릴 고무), elastomeric rotary lip seal(고무 회전 씨일), abrasive wear(연삭 마모), recoveryratio(탄성 회복율), tan δ(탄젠트 델타)