NSK Europe, the European arm of Japanese bearing manufacturer NSK, has developed deep groove ball bearings that don’t require external lubrication to be used in submersible pumps handling cryogenic gases such as hydrogen and LNG.
NSK has developed particular 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 made of self-lubricating fluoroplastic are seeing rising adoption in submersible pumps as a growing number of projects promote using hydrogen as an vitality supply. These projects often use special submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures all the method down to round -200°C.
In such pumps, the double bearing of the pump shaft is a important design factor. Corrosion resistance is important, and no lubricant can be used apart from the media washing around the bearing. However, เกจวัดแรงดัน4นิ้วราคา places robust calls for on the fabric pairing.
So NSK has developed a collection of deep groove ball bearings specifically for these exceptional working situations, and several other key design features present differentiation from standard pump bearings. For example, the internal and outer rings are made of a chrome steel tailored to the special requirements of rolling bearings.
A stable cage that occupies the entire internal quantity of the bearing supplies steering for the rolling elements (also made of stainless steel), while the cage material, a self-lubricating fluoroplastic, ensures low friction operating of the bearing without exterior lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and presents good low-temperature properties at speeds up to 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 varied sizes (shaft diameter 30–100 mm) and are designed for use in both larger hydrogen pumping amenities and decentralised purposes, such as hydrogen filling stations.
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