Fatigue Life Calculation of Mechanical Seal Welded Metal Bellows

Abstract

For welded metal bellows, bellows are used in mechanical seals to replace springs and other auxiliary sealing coils in seals. When the traditional rotating device rotates at a high speed, the moving ring in the mechanical sealing process will cause the axial displacement, and the bellows can compensate or reduce by relying on its own performance. For other mechanical devices, the failure of mechanical seals will directly affect their performance and life, and the failure of welded metal blowers used in mechanical seals is usually considered as fatigue damage. Therefore, studying the welding process of the bellows is extremely important to its service life. This article mainly studies the fatigue life of mechanical seal welded metal bellows. First, the characteristics of mechanical seal welded metal bellows are described by the literature research method, and then the fatigue life calculation method is summarized. Finally, the use of the experimental research method studied the fatigue life of u-shaped metal bellows and v-shaped metal bellows at temperature differences of 3°C, 4°C, 5°C, and 6°C. The experimental results show that as the temperature difference increases, the minimum fatigue life of the two types of metal bellows decreases with decline. At the same time, it can also be found that the minimum fatigue life of the v-shaped metal bellows has always far exceeded U-shaped metal bellows.