Design flexibility for furnace integration
The hollow shaft design of certain magnetic fluid feedthroughs offers a distinct advantage for furnace builders. This configuration allows engineers to insert different center shafts based on specific equipment requirements. This flexible structure helps in efficient power transmission and sealing. It can also reduce the variety of materials needed in inventory, which affects overall project costs.
Meeting the demands of thermal processing
Vacuum and pressurized furnaces are used for advanced heat treatments. In steel and non-ferrous material processing, 'vacuum heat treatment' in a reduced-pressure atmosphere is considered effective for quality and environmental reasons. A specific process called quenching involves keeping a material at high temperature in a reduced-pressure furnace, then rapidly cooling it with circulated high-pressure gas. Introducing rotation for the internal fan is necessary for this gas circulation, creating a need for a reliable rotary feedthrough.
Performance specifications for extreme environments
Feedthroughs for these applications must operate reliably under stringent conditions. Devices are used for ultra-high vacuum systems and equipment like single crystal silicon furnaces, chemical vapor deposition tools, and heat treatment furnaces. They must function across a range from low speed to high speed and from low to high pressure. Performance benchmarks are high. One manufacturer cites a vacuum degree capability of 10-6 Pa and a leakage rate of 10-12 Pa·m3/sec.
Economic considerations and long-term value
The initial cost of a rotary vacuum feedthrough is a factor. Compared to traditional sealing methods like O-rings or mechanical seals, the upfront investment is typically higher. This is due to special components such as magnetic fluid and magnets, which increase manufacturing expense. Implementation also requires design and adjustment based on the specific equipment. However, the long-term perspective often justifies this initial outlay through improved reliability and reduced maintenance in demanding furnace environments.
We manufacture related sealing components for these challenging industrial applications.