Views: 0 Author: Site Editor Publish Time: 2025-06-12 Origin: Site
The working principles of rotary joint inlet and outlet vary depending on the type of rotary joint and the medium flowing through it. Although rotary joints may have different sealing structures, most use a spring-loaded mechanical seal to ensure leak-free operation. However, because the media differ—such as steam, hot oil, or water—the inlet and outlet designs also differ accordingly.
Steam rotary joints typically have side ports as steam inlets. The inner pipe acts as a siphon tube to discharge condensate. Proper condensate removal is critical, as it directly affects the temperature of the roller. The siphon tube usually consists of a rigid pipe inserted deep into the roller and a flexible hose hanging near the roller’s inner wall. Under steam pressure, this arrangement efficiently removes condensate, maintaining stable temperature control.
For hot oil applications, especially in single-end mounted equipment, double-flow rotary joints are used. Both the inlet and outlet pass through the same rotary joint. To ensure even temperature distribution, the oil typically enters through the inner pipe, while the outlet flows out through holes around the joint housing. The inner pipe extends beyond half the length of the roller, with small holes drilled near its end to guarantee the roller is always full of oil. The inner pipe diameter is enlarged, and the outlet holes are made smaller to maintain proper flow balance.
If the roller has rotary joints installed at both ends, the setup is simpler: each end has a rotary joint of the same size, and either end can serve as inlet or outlet.
The working principle of water rotary joints is similar to hot oil rotary joints. A single-end installed double-flow rotary joint is commonly used, where water enters through the inner pipe. The inlet flow rate is higher than the outlet flow rate, ensuring the roller remains full of water. When rotary joints are installed on both ends of the roller, the inlet is usually faster than the outlet because the water is pumped under pressure. This keeps the roller continuously filled.
