NSK Europe, the European arm of Japanese bearing manufacturer NSK, has developed deep groove ball bearings that don’t require external lubrication for use in submersible pumps handling 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 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 variety of initiatives promote the usage of hydrogen as an power supply. These tasks typically use particular submersible pumps that can reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures right down to around -200°C.
In such pumps, the double bearing of the pump shaft is a crucial design component. เกจวัดแรงดันลมดิจิตอล is important, and no lubricant can be utilized aside from the media washing across the bearing. However, this places robust demands on the material 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 features present differentiation from typical pump bearings. For example, the inner and outer rings are made of a stainless steel tailored to the special requirements of rolling bearings.
A steady cage that occupies the whole inside volume of the bearing provides steerage for the rolling elements (also manufactured from stainless steel), whereas the cage materials, a self-lubricating fluoroplastic, ensures low friction working 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 as much as 3600 rpm. The cage has a two-piece design, with the 2 halves joined by chrome steel rivets.
The NSK bearings can be found in numerous sizes (shaft diameter 30–100 mm) and are designed to be used in both bigger hydrogen pumping services and decentralised applications, such as hydrogen filling stations.
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