Do You Know The Sealing Principle of Rotary Joint

Rotary joint sealing is a common sealing device widely used in pipeline systems to prevent or reduce fluid leakage. Its principle is to achieve sealing effect by rotating the relative motion of the sealing surface.

A rotary joint seal typically consists of two sealing surfaces, one fixed in the pipeline system and the other connected to the rotating component. When the rotating component rotates, a sealed contact area is formed between the sealing surfaces. The contact area relies on the surface tension and friction of the sealing surface to prevent fluid leakage from the joint.

In the sealing of rotary joints, the sealing surface is usually made of metal or non-metal materials, which have the characteristics of high requirements for smoothness and processing accuracy. The 

sealing surface is often coated with a delicate and durable sealing medium, such as rubber or PTFE, to enhance the sealing effect between the sealing surfaces.

In practical applications, the sealing of rotary joints requires ensuring the fitting accuracy of the sealing surface and the contact pressure between the sealing surfaces. Accurate fitting dimensions can maintain good contact between the sealing surface and prevent leakage during rotation. Appropriate contact pressure can ensure that the small protrusions and depressions on the sealing surface can fully contact, improving the sealing effect.

In addition, the sealing of rotary joints also requires attention to lubrication and cooling. By providing an appropriate amount of lubricating oil or cooling medium on the sealing surface, the wear and heat loss of the sealing surface can be reduced, and the service life of the seal can be extended.

In summary, rotary joint sealing is a sealing device based on the relative motion of the rotating sealing surface. It achieves reliable sealing of pipeline systems and avoids fluid leakage through effective matching dimensions, contact pressure, and lubrication cooling measures.