NSK Europe, the European arm of Japanese bearing producer 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 particular 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 use of hydrogen as an vitality supply. These tasks often use particular submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures down to around -200°C.
In such pumps, the double bearing of the pump shaft is a crucial design component. Corrosion resistance is crucial, and no lubricant can be used other than the media washing around the bearing. However, this places robust demands on the fabric pairing.
So NSK has developed a collection of deep groove ball bearings particularly for these exceptional operating conditions, and several key design options provide differentiation from conventional pump bearings. For instance, the inside and outer rings are manufactured from a chrome steel adapted to the particular requirements of rolling bearings.
A stable cage that occupies the whole internal volume of the bearing provides steering for the rolling parts (also made of stainless steel), whereas the cage material, a self-lubricating fluoroplastic, ensures low friction working of the bearing with out exterior lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and provides good low-temperature properties at speeds as a lot as 3600 rpm. เกจวัดแรงดัน has a two-piece design, with the two halves joined by stainless steel rivets.
The NSK bearings can be found in various sizes (shaft diameter 30–100 mm) and are designed for use in both larger hydrogen pumping facilities and decentralised applications, similar to hydrogen filling stations.
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