How many transmission methods are there for the drive seat and the rotating ring of rotary mechanical seals?

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1. Pin drive. Through the push ring, transmission is achieved using a pin between the push ring and the moving ring (Figure 35); this type of transmission is commonly used in structures with small springs. 2. Lug drive. The Type 104 seal produced domestically adopts this structure. An arc-shaped groove is formed on the outer edge of the moving ring, while the drive seat that comes into contact with it is pressed into a lug so that it can fit into the groove of the moving ring, thereby enabling transmission (Figure 13). This structure can be used for large springs as well as for the sealing structures of small springs. 3. Parallel spring drive. The transmission between the drive seat and the spring, as well as between the spring and the moving ring, is achieved entirely through the interference fit of the inner diameter of the large spring (Figure 34); of course, there are also requirements regarding the direction of rotation. This type of structure is used in the sealing design of large springs. 4. Loop spring drive. To enhance the reliability of the loop spring drive, both ends of the spring are shaped into hooks that hook onto the drive seat and the moving ring respectively (Figure 36). 5. Clutch transmission. The drive seat and the moving ring (or via a push ring) are respectively formed as square protrusions and notches; after assembly, the protrusion fits into the notch to enable transmission (Figure 37). 6. Bellows drive. This approach is a characteristic structure of bellows-type seals: the two ends of the bellows are connected to the drive seat and the moving ring respectively, with the method of connection depending on the material of the bellows. For example, welding is used for metal bellows, while integral or other types of connections are used for rubber and PTFE bellows.