Celeroton’s oil-free cryogenic gas circulator separates cooling generation from the customer system, enabling independent serviceability, contamination-free operation, and intrinsically low mechanical vibration levels.
Celeroton introduces an actively driven cryogenic gas circulation concept that transfers cooling from a mechanically isolated cold source – such as Pulse Tube, Stirling, Gifford-McMahon (GM) Reverse Turbo-Brayton cryocooler – to the customer system. As an innovative gas circulator for cooling systems, it enables fully decoupled cryogenic architecture.
Rather than relying on direct cold-head attachment, cooling is transported via a closed-loop, allowing for spatial separation between cooling generation and cooling demand. This circulation is provided by a high-speed, oil-free cryogenic gas circulator based on dynamic gas bearing technology.
The absence of lubricants and mechanical contact eliminates wear and contamination risks, resulting in a long operational lifetime. The gas bearing principle enables inherent vibration-free operation, which is essential for preserving the electromagnetic and mechanical integrity of customer systems and surrounding structures. This makes the circulator well suited for a wide range of applications, including the cryogenic cooling of optical instruments, high-temperature superconducting coils, and busbars.
The cryogenic gas circulator consists of an impeller mounted on a shaft with radial and axial bearings. The impeller increases pressure through dynamic principles, thereby driving the cryogenic loop. During operation, the rotor floats on a gas cushion generated by its rotation and surface structure. Surrounded by cryogenic gas, which acts as bearing lubricant, the design is inherently oil- and contamination-free. Static seals isolate the gas section of the circulator, ensuring wear- and maintenance-free operation. A permanent magnet embedded in the rotor forms the motor together with the external motor stator. The combination of continuous gas flow driven by the impeller and contact-free gas bearings enables vibration-free operation.
From an operational and maintenance perspective, circulator-based cooling architecture represents a significant step forward in system serviceability. Both the circulator and the primary cooling unit can be accessed, and replaced independently of the customer system, enabling predictive and condition-based maintenance strategies.
Key operational parameters – including pressure ratio, mass flow, rotational speed, efficiency, and vibration signatures – can be continuously monitored, providing direct indicators of system health.
By decoupling cooling delivery from cooling generation, Celeroton’s circulator reduces downtime, limits intervention frequency, and increases overall system availability – all key drivers for lowering operational expenditure. In addition, the cryogenic circulation approach enables micro-vibration-free delivery of cryogenic cooling to the customer system, further reducing wear and enhancing long-term reliability.
