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 handling cryogenic gases corresponding to 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.
The stainless-steel bearings with a cage made of self-lubricating fluoroplastic are seeing growing adoption in submersible pumps as a rising number of projects promote the use of hydrogen as an energy source. These projects usually 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 crucial design factor. Corrosion resistance is important, and no lubricant can be used apart from the media washing across the bearing. However, this locations robust calls for on the fabric pairing.
So NSK has developed a series of deep groove ball bearings particularly for these exceptional working circumstances, and various other key design options present differentiation from typical pump bearings. For example, the internal and outer rings are made from a stainless steel tailored to the particular necessities of rolling bearings.
A secure cage that occupies the complete inside volume of the bearing provides steerage for the rolling components (also made of stainless steel), whereas the cage materials, a self-lubricating fluoroplastic, ensures low friction operating of the bearing without exterior lubrication. In addition, the high-performance fluoroplastic is extraordinarily wear-resistant and offers good low-temperature properties at speeds as a lot as 3600 rpm. The cage has a two-piece design, with the 2 halves joined by chrome steel rivets.
ตัววัดแรงดันน้ำ are available in varied sizes (shaft diameter 30–100 mm) and are designed to be used in both bigger hydrogen pumping services and decentralised purposes, such as hydrogen filling stations.
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