NSK Europe, the European arm of Japanese bearing manufacturer NSK, has developed deep groove ball bearings that don’t require external lubrication to be used in submersible pumps handling cryogenic gases similar to hydrogen and LNG.
NSK has developed special shaft bearings with a cage made from self-lubricating fluoroplastic for submersible pumps that deal with cryogenic gases and liquids.
The stainless-steel bearings with a cage made of self-lubricating fluoroplastic are seeing rising adoption in submersible pumps as a rising number of tasks promote using hydrogen as an power source. These projects often use special submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures all the way down to around -200°C.
In such pumps, the double bearing of the pump shaft is a crucial design element. เกจวัดแรงดัน4บาร์ is important, and no lubricant can be used apart from the media washing around the bearing. However, this locations robust demands on the material pairing.
So NSK has developed a collection of deep groove ball bearings particularly for these distinctive operating conditions, and a number of other key design features provide differentiation from conventional pump bearings. For instance, the internal and outer rings are made from a stainless-steel tailored to the special requirements of rolling bearings.
A steady cage that occupies the whole internal quantity of the bearing supplies steering for the rolling parts (also made from stainless steel), while the cage materials, a self-lubricating fluoroplastic, ensures low friction running of the bearing with out external lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and presents good low-temperature properties at speeds up to 3600 rpm. The cage has a two-piece design, with the two halves joined by stainless-steel rivets.
The NSK bearings can be found in numerous sizes (shaft diameter 30–100 mm) and are designed to be used in each bigger hydrogen pumping facilities and decentralised purposes, corresponding to hydrogen filling stations.