NSK Europe, the European arm of Japanese bearing producer NSK, has developed deep groove ball bearings that do not require external lubrication to be used in submersible pumps dealing with cryogenic gases such as 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.
เกจวัดแรงดันไฮดรอลิค -steel bearings with a cage manufactured from self-lubricating fluoroplastic are seeing increasing adoption in submersible pumps as a growing number of initiatives promote the use of hydrogen as an energy source. These initiatives usually 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 critical design factor. Corrosion resistance is essential, and no lubricant can be utilized aside from the media washing across the bearing. However, this places robust calls for on the material pairing.
So NSK has developed a sequence of deep groove ball bearings particularly for these exceptional working conditions, and several other key design options present differentiation from standard pump bearings. For example, the internal and outer rings are manufactured from a stainless-steel tailored to the special necessities of rolling bearings.
A stable cage that occupies the complete inside volume of the bearing provides guidance for the rolling parts (also made from stainless steel), while the cage materials, a self-lubricating fluoroplastic, ensures low friction operating of the bearing with out external lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and provides good low-temperature properties at speeds as much as 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 both larger hydrogen pumping services and decentralised purposes, similar to hydrogen filling stations.