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 dealing with cryogenic gases corresponding 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 growing variety of initiatives promote using hydrogen as an energy source. These tasks typically use special submersible pumps that can reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures down to round -200°C.
In such pumps, the double bearing of the pump shaft is a crucial design element. Corrosion resistance is essential, and no lubricant can be utilized aside from the media washing across the bearing. However, ราคาpressuregauge places powerful calls for on the material pairing.
So NSK has developed a series of deep groove ball bearings specifically for these distinctive operating circumstances, and various other key design options provide differentiation from conventional pump bearings. For instance, the inside and outer rings are manufactured from a stainless steel tailored to the special requirements of rolling bearings.
A secure cage that occupies the entire inner volume of the bearing supplies steerage 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 exterior lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and offers 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 are available in numerous sizes (shaft diameter 30–100 mm) and are designed for use in each larger hydrogen pumping facilities and decentralised functions, such as hydrogen filling stations.
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