NSK Europe, the European arm of Japanese bearing manufacturer NSK, has developed deep groove ball bearings that don’t require exterior lubrication to be used in submersible pumps dealing with cryogenic gases similar to hydrogen and LNG.
NSK has developed special shaft bearings with a cage produced from self-lubricating fluoroplastic for submersible pumps that handle cryogenic gases and liquids.
The stainless-steel bearings with a cage manufactured from self-lubricating fluoroplastic are seeing rising adoption in submersible pumps as a rising number of tasks promote the utilization of hydrogen as an vitality source. These projects often use particular submersible pumps that can reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures right down to round -200°C.
In such pumps, the double bearing of the pump shaft is a important design factor. Corrosion resistance is essential, and no lubricant can be used aside from the media washing across the bearing. However, pressure gauge trerice ราคา places powerful calls for on the material pairing.
So NSK has developed a collection of deep groove ball bearings particularly for these distinctive operating situations, and various other key design options present differentiation from typical pump bearings. For instance, the inside and outer rings are made of a chrome steel adapted to the special necessities of rolling bearings.
A stable cage that occupies the entire internal volume of the bearing offers guidance for the rolling elements (also made from stainless steel), whereas the cage material, a self-lubricating fluoroplastic, ensures low friction operating of the bearing without exterior lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and offers good low-temperature properties at speeds up to 3600 rpm. The cage has a two-piece design, with the two halves joined by chrome steel rivets.
The NSK bearings are available in numerous sizes (shaft diameter 30–100 mm) and are designed for use in each larger hydrogen pumping services and decentralised applications, such as hydrogen filling stations.