Dunlee’s CoolGlide™ Liquid Metal Bearings are designed and manufactured in Hamburg, Germany, based on knowledge gained from over 30 years of LMB technology development and over 100,000 LMB units sold worldwide. The invention of Liquid Metal Bearing Technology by the Hamburg R&D team in 1989 had an enormous impact on performance and ease-of-use, becoming the gold standard for CT and Image Guided Therapy systems.
Continued refinements led to the introduction of CoolGlide™, the LMB technology now employed in Dunlee tubes. In comparison to traditional ball bearing tubes, CoolGlide™ LMB tubes are designed for higher throughput, faster workflow, lower noise, higher reliability and lower total cost. Let's compare:
CAN INCREASE PRODUCTIVITY: SCAN MORE PERSONS & DECREASE WAITING TIME
CoolGlide™ LMB – High Throughput / Excellent cooling capacity
A cooling channel within the bearing shaft* directs cooling fluid to the anode. This design provides much higher heat conduction and cooling capacity than traditional ball bearing tubes.
* Related to the Coolglide LMB design used in Dunlee‘s Xpert bundles. Dunlee offers different LMB designs, all designs provide high throughput / excellent cooling capacity.
Traditional Ball Bearing – Lower cooling capacity
Lower heat conduction from the anode through the bearing as there is no direct cooling through the shaft. In contrast to CoolGlide™ LMB the ball bearing is an insulating barrier against heat conduction. This can result in overheating which requires pauses to wait for the tube to cool between studies, slowing down throughput.
The anode rotates continuously and provides constant high speed through the entire working day without stopping, speeding up workflow and facilitating productivity. There is no preparation time necessary between every scan, as there is for ball bearing tubes.
Traditional Ball Bearing – Anode rotation stopped after every scan
Anode rotation for ball bearing tubes is started prior to a scan and stopped when the scan is finished. This approach requires preparation time for the tube for every scan.
CoolGlide™ LMB – High Reliability / virtually no wear
The bearing shaft and sleeve glide on a liquid film. The liquid is pumped to the interior of the bearing by spiral grooves. As there is no direct contact during operation, there‘s virtually no wear.
Traditional Ball Bearing – Wear off, risk of binding and jamming
With operation, the lubricant (which is usually silver or lead metal) wears off of the ball and race surfaces, resulting in steel-to-steel contact that leads to binding or jamming. High temperature and high speed will reduce bearing life the most.
CoolGlide™ LMB – Low Noise / No contact of bearing and shaft
As there is no direct contact , there is no audible bearing noise during operation.
Traditional Ball Bearing – Noise and Vibration
The movement of the ball bearings result in noise and vibrations whenever the CT scanner is used.
Lifetime of X-ray tubes is dependent on usage and application, lifetime indicated here is an average value and may differ significantly for individual usage and application patterns.
Based on Dunlee internal reliability records. Xceed is a product bundle including X-ray tube and generator and high voltage cables.
“CT X-ray tube lifetime Analysis: A Multiyear study”, by Yusuf Emre Erdi published in “RADIOLOGIC TECHNOLOGY, July/August 2013, Volume 84, Number 6”.
Varex Imaging Corporation Fiscal Year 2020 Annual Report on Form 10-K; Page 4 ; “(….) CT X-ray tubes generally need to be replaced every 2 to 4 years. In China, the replacement cycle for CT X-ray tubes can be as every 6 to 12 months due to high utilization of imaging equipment.”
Dunlee is a brand of the Philips Company Group and distributes all products, solutions and services for the third-party imaging business. The product portfolio includes CT, MR and X-ray solutions for OEMs, CT replacement tubes and 3D printed tungsten products.
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