NSK Europe, the European arm of Japanese bearing producer NSK, has developed deep groove ball bearings that don’t require exterior lubrication for use in submersible pumps dealing with cryogenic gases similar to hydrogen and LNG.
NSK has developed special shaft bearings with a cage created 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 variety of projects promote the usage of hydrogen as an power supply. These projects typically use particular submersible pumps that may reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures down to around -200°C.
In such pumps, the double bearing of the pump shaft is a critical design element. Corrosion resistance is essential, and no lubricant can be utilized other than the media washing around the bearing. However, this places powerful calls for on the fabric pairing.
So NSK has developed a collection of deep groove ball bearings specifically for these exceptional working conditions, and a quantity of other key design options provide differentiation from standard pump bearings. For example, the inner and outer rings are manufactured from a stainless-steel tailored to the special requirements of rolling bearings.
A steady cage that occupies the complete inner quantity of the bearing offers steerage for the rolling elements (also made of stainless steel), whereas the cage material, a self-lubricating fluoroplastic, ensures low friction running of the bearing without external lubrication. In addition, the high-performance fluoroplastic is extraordinarily wear-resistant and provides 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.
เพรสเชอร์เกจลม can be found in numerous sizes (shaft diameter 30–100 mm) and are designed to be used in each bigger hydrogen pumping amenities and decentralised applications, similar to hydrogen filling stations.