What factors should be considered for the width of the sealed end face?
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This post was last edited by Zunming Machinery on 2023-11-16 at 10:19. The width of the sealed end face is generally determined first by the width of the soft surface; the width of the hard surface goes without saying. The leakage amount has little to do with the end face width. However, it is better to have a narrower width in terms of the frictional heat generated; less heat is produced, the temperature gradient is smaller, thermal deformation is reduced, and wear is more uniform ； From a stress perspective, being too narrow is disadvantageous, as it increases the likelihood of failure and deformation. At the same time, the diameter of the sealed end face is a function of the load coefficient. Therefore, the width of the sealed end face should be considered comprehensively. Generally speaking, the sealing end face of ordinary media widens as the diameter increases. Ring diameter (mm) Ring width (mm): 20–60, 2–4; 60–100, 4–6; 100–200, 5–7. For light hydrocarbon media, the end face width is somewhat larger than that in ordinary media, while in high-speed mechanical seals the end face width is relatively narrower, as otherwise excessive heat generation would prevent proper operation; it is generally around 3 mm.
The width of the sealed end face must take into account various factors during design, in order to ensure both an excellent sealing effect as well as the stability and durability of the sealing ring. Here are some important factors to consider: 1. Sealing medium: The corrosivity, viscosity, temperature, and other properties of different media all affect the selection of the sealing face width. For example, the sealing face of light hydrocarbon media may require to be wider than that of ordinary media. 2. Sealing pressure: Under high pressure, overly narrow sealing surfaces can lead to damage and deformation. 3. Sealing speed: For mechanically sealed systems that operate at high speeds, a narrower sealing surface is often required in order to avoid excessive heat generation. 4. Heat control: Narrow sealing end faces help reduce the heat generated by friction, aiding in the control of temperature gradients and thermal deformation, thereby maintaining uniform wear. 5. Mechanical stability: The width of the sealed end face is also limited by the stability and load-bearing capacity of the mechanical components, in order to prevent damage and deformation caused by an excessively narrow width. 6. Design empirical values: The width of the sealed end face is often selected based on empirical values; for example, a series of recommended widths based on the ring diameter are provided. 7. Processing and cost factors: An increase in the end face width may mean more material usage and greater processing difficulties, which in turn affects costs. In summary, the width of the sealed end face should be determined by taking into account various factors such as specific operating conditions, properties of the medium, design requirements, and empirical rules. .