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Keywords = back blade seal

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11 pages, 3390 KB  
Article
Performance of Magnetic Fluid and Back Blade Combined Seal for Sealing Water
by Hujun Wang, Zhongquan Gao, Xinzhi He, Zhenkun Li, Jinqiu Zhao, Zhuo Luo and Yaqun Wei
Magnetochemistry 2023, 9(2), 38; https://doi.org/10.3390/magnetochemistry9020038 - 19 Jan 2023
Cited by 10 | Viewed by 3321
Abstract
When sealing liquids with magnetic fluid, the interfacial stability problem caused by the interaction between the magnetic fluid and the sealed liquid leads to poor sealing performance. Centrifugal force is generated by the rotation of the sealed liquid in the back blade seal, [...] Read more.
When sealing liquids with magnetic fluid, the interfacial stability problem caused by the interaction between the magnetic fluid and the sealed liquid leads to poor sealing performance. Centrifugal force is generated by the rotation of the sealed liquid in the back blade seal, which forms back pressure to reduce the load of the seal or prevents the sealed liquid from leaking. To reduce the influence of the shaft speed on the sealing performance, a combined magnetic fluid and back blade seal was designed for sealing liquids and a combined seal experiment stand was set up. Theoretical and experimental studies were carried out. The results showed that under a higher shaft speed, the combined seal structure had better sealing performance in which the back blade seal played the main role; the magnetic fluid seal played a major role in stopping and lowering the speed to prevent seal leakage. The combined seal could run stably under different shaft speeds. Full article
(This article belongs to the Special Issue Advanced Applications of Magnetic Field-Responsive Fluid)
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19 pages, 6448 KB  
Article
Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants
by Hyo Seo Kwak, Hansaem Seong, Rivaldo Mersis Brilianto and Chul Kim
Appl. Sci. 2019, 9(15), 3095; https://doi.org/10.3390/app9153095 - 31 Jul 2019
Cited by 10 | Viewed by 11171
Abstract
In combined cycle power plants (CCPPs), the bypass butterfly valve is a key component to facilitate regulation of exhaust gas energy available at the turbine and to not produce too much boost pressure. The conventional damper valve causes leakage, back flow into the [...] Read more.
In combined cycle power plants (CCPPs), the bypass butterfly valve is a key component to facilitate regulation of exhaust gas energy available at the turbine and to not produce too much boost pressure. The conventional damper valve causes leakage, back flow into the turbine, and damage of the blade, and the existing dual-layered seal with polytetrafluoroethylene (PTFE) and metal should be frequently replaced owing to its low durability and deterioration of mechanical properties under a high temperature. This study devised a triple offset butterfly valve with a new type of seal by alternatively laminating stainless steel and graphite to improve valve performance at the high temperature (350 °C). The slope angles of the seal contact surface to prevent friction were calculated using the mathematical models of the triple offset. Thermal-structure coupled analyses by varying the number of graphite and thickness were conducted, and the seven-layer model with the graphite thickness of 0.8 mm, which shows airtightness and smooth operation, was chosen. The contact stresses behaviors of the graphite at 350 °C and at −196 °C were investigated, and it was found that the graphite is in charge of improving driving performance of the disc at the high temperature and sealing performance at the cryogenic temperature. The performance tests and the field tests of the suggested model verified its performance at the working temperature. Full article
(This article belongs to the Section Mechanical Engineering)
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