High Speed Rotary Joint Structure and Sealing Components

High Speed Rotary Joint Applications and Structure

‍High speed rotary joint is commonly used precision devices for media transmission, used to solve problems such as spindle leakage in various media applications. They are widely used in papermaking, chemical processing, plastics industries, etc. This rotary joint is supported by high-precision bearings, ensuring vibration-free operation. It features a wear-resistant, heat

resistant, and impact resistant tungsten carbide and hardened stainless steel spindle. Inside the rotary joint, the stainless steel spring is positioned outside the fluid flow path to prevent fluid impact, while the superior balanced seal design ensures extremely low friction.

Differences Between High Speed Rotary Joint and Standard Single Passage Rotary Joint

The single passage rotary joint is a precision rotating component that primarily utilizes a mechanical seal structure. Its stator is made of aluminum alloy, while the main shaft is constructed from hardened stainless steel; the front section is supported by two high-precision rolling bearings, and the rear section features a corrosion-resistant spring. Hard metal faces are used at both ends to form a flat seal, allowing a single medium to flow in through the stator port and out through the rotor's central bore. The rotor threaded end is connected to the rotating shaft of the equipment. The rotation speed is determined by the rotation speed of the main shaft of the equipment. It is a passive rotating component. It uses spring compensation based on the thrust of the medium. It has high wear resistance and automatic compensation function. It uses the advantage of disassembly seal to stabilize internal pressure and effectively prevent leakage of the rotary joint.

Single passage rotary joint utilize internal sealing rings and gaskets, offering excellent sealing capabilities and good pressure resistance. It is suitable for transmission media such as steam, water, and heat transfer oil, and can be used in high-pressure environments. However, the seals and rotary joints are in long-term contact, resulting in limited wear resistance and easy wear. However, a single passage rotary joint can only rotate in one direction and cannot rotate forward or backward. In contrast, high speed rotary joints support higher rotational speeds and offer superior pressure resistance. When selecting the model, factors such as the equipment's rotational speed, operating pressure, and medium need to be considered.

Seals Used in High Speed Rotary Joints

Standard seals tend to wear out rapidly during high-speed operation. Furthermore, insufficient surface smoothness can lead to frictional resistance. Consequently, high-speed rotary joints require high-speed bearings and seals specifically designed to meet high-speed operational demands. Silicon carbide is currently a widely used material for this purpose. Conventional rotary joints typically rely on a seal formed between the shaft face and a graphite ring; 304 stainless steel shaft heads are prone to generating heat due to friction when rotating at high speeds. This heat can soften the surface, making it susceptible to the ingress of particulate impurities or damage caused by graphite particles worn off the sealing ring. In contrast, silicon carbide is renowned for its hardness; when the sealing surface is precision-finished to a mirror-like quality, it exhibits a low coefficient of friction against the graphite ring during high-speed operation, resulting in superior durability. This combination represents one of the most effective sealing solutions currently employed in high-speed rotary joints.