Vacuum Rotary Union

Steam rotary joint is a precision mechanical device designed specifically for conveying high-temperature steam. It can continuously and stably transmit steam while the equipment components rotate relative to each other, ensuring the efficient operation of the entire system. The following is a detailed analysis of the working principle of steam rotary joints:

Basic structure and components:

The steam rotary joint mainly consists of core components such as the shell, rotor, seals, supporting bearings, and connecting flanges. The shell is fixed on the stationary equipment, and the rotor is connected to the rotating equipment, forming relative rotational motion between the two. Seals (such as carbon rings, graphite seals, mechanical seals, etc.) are installed in the gap between the housing and rotor to ensure that there is no leakage of steam during rotation. Support bearings are used to withstand axial and radial loads, ensuring smooth rotation of the rotor. The connecting flange is used to connect with the external pipeline system and achieve steam input and output.

Steam transmission process:

1. Steam introduction

The external steam source enters the shell side of the rotary joint through a connecting flange. At this point, a closed space is formed inside the shell to accommodate and guide the flow of steam.

2. Rotary transmission

There is a flow channel inside the rotor that is connected to the casing. When the rotor rotates with the rotating equipment, the internal flow channel is dynamically connected to the steam channel inside the casing. Under pressure, steam passes through the inner cavity of the rotor and passes through the relatively rotating sealing interface, smoothly transitioning from the stationary shell side to the rotating rotor side.

3. Steam output

After the effective transmission of steam through the rotor, it is continuously transported to the parts inside the rotating equipment that require steam through the connecting flange on the other side, such as steam heaters, steam drive devices, etc.

1. Dynamic sealing

The key to steam rotary joints lies in how to achieve reliable sealing between the relatively rotating shell and rotor. This usually relies on high-performance seals, such as carbon rings, graphite seals, or mechanical seals. These sealing components form one or more sealing barriers through precision machined surface contact, line contact, or end face friction, effectively preventing steam leakage along the rotating interface.

2. Compensation and cooling

In response to the potential thermal deformation and increased wear of sealing materials caused by high steam temperatures, advanced steam rotary joints often use thermal expansion compensation mechanisms (such as corrugated pipes, floating sealing rings, etc.) and cooling systems (such as built-in cooling channels, air gap cooling, etc.). The compensation mechanism can adapt to size changes caused by temperature differences and maintain a constant sealing gap; The cooling system reduces the working temperature of the joint by circulating the cooling medium, protects the sealing components, and extends their service life.

In summary, steam rotary joints, with their unique and precise structural design, have successfully achieved efficient and stable steam transmission under relative rotation of equipment components through the collaborative work of core components such as shells, rotors, and seals. They are essential key equipment in modern industry for handling high-temperature steam.

Maximum speed: 750 RPM
Maximum speed: torque at 120 PSI/8 bar
Maximum pressure: 200 PSI 14 bar
Maximum temperature: 120 ° C>120 ° C
*Only cold water (up to 50 ° C) is allowed to exceed a pressure of 8 bars
 

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