Composition of mechanical seal system

Composition of mechanical seal system

21/03/25 10:46:03

The main components of a mechanical seal include a moving ring, a static ring, a cooling device and a compression spring, but these components are far from enough to achieve satisfactory efficiency, and the corresponding system configuration is required, so the next step is to search Everyone understands, and understands its system composition.

1. Shaft seal box

In the past, the shaft seal box containing the mechanical seal was a stuffing box designed for soft packing seals. It is not suitable for holding mechanical seals, not only the size is too small, the gap is too narrow, but also the simple cylindrical shape is not suitable.

Overseas have formulated the standard of oversized mechanical seal shaft seal box. In addition, the United States-Duramitelek Corporation and the British Fluid Mechanics Research Group are both researching a reasonable mechanical seal shaft seal box. Its shape should not only facilitate fluid flow and heat dissipation, but also facilitate the removal of solid particles, giving Sealing creates a good ambient environment.

2. Emission control of volatile substances

In the past, we only paid attention to the elimination of visible fluid leakage, but did not pay attention to the control of the escape of invisible volatiles, which caused environmental pollution and was dangerous to equipment and people. Foreign countries such as the Sealing Technology Committee of the American Society of Tribology and the Society of Lubrication Engineers have formulated SP-30 (1994), SP-32 (1990) and SP-33 (1991) for easy control of rotating machinery, compressors, and screw systems with mechanical seals. A guide to volatile emissions regulations. SP-30 is implemented in three phases. It clearly stipulates the definition of blocking fluid and buffer fluid, and clarifies the wrong and confusing concepts. A blocking fluid is a fluid that is introduced between the double seals to completely block leakage of the process fluid to the surrounding environment. The pressure of the blocking fluid is always higher than the pressure of the process fluid being sealed. Buffer fluid is the fluid used as a lubricant or buffer between the double seals, the buffer fluid pressure is always lower than the pressure of the process fluid being sealed.

3. Supporting auxiliary system

In the auxiliary system of the mechanical seal, cooling, heating, flushing and other systems need to be matched, the pump cycle needs to be optimized, and problems such as the status monitoring system are being studied and solved. The matching of auxiliary systems is stipulated in the API-682 standard.

4. Gas blocking sealing system

In the past, liquid blocking liquid or liquid blocking gas was commonly used in blocking sealing system. In order to simplify the huge blocking liquid system, blocking gas is used to block liquid or gas blocking sealing system. Spiral groove gas sealing and blocking gas, floating sleeve and blocking gas can be used in the sealing system. to block gases and liquids.

The system composition of the mechanical seal is mainly divided into the above four aspects. By understanding the introduction of different aspects, a satisfactory use efficiency can be achieved in the use process and the use requirements of the enterprise can be fulfilled.