เกจวัดแรงดัน4บาร์ , the European arm of Japanese bearing producer NSK, has developed deep groove ball bearings that do not require external lubrication for use in submersible pumps dealing with cryogenic gases similar to hydrogen and LNG.
NSK has developed particular shaft bearings with a cage made 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 growing adoption in submersible pumps as a growing number of initiatives promote the usage of hydrogen as an power supply. These initiatives usually use special submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures right down to around -200°C.
In such pumps, the double bearing of the pump shaft is a important design factor. Corrosion resistance is essential, and no lubricant can be used other than the media washing around the bearing. However, this places tough demands on the material pairing.
So NSK has developed a collection of deep groove ball bearings specifically for these exceptional operating conditions, and various other key design options present differentiation from conventional pump bearings. For instance, the inside and outer rings are made of a chrome steel tailored to the particular requirements of rolling bearings.
A stable cage that occupies the complete inside quantity of the bearing provides steerage for the rolling parts (also made from stainless steel), while the cage material, a self-lubricating fluoroplastic, ensures low friction working 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 up to 3600 rpm. The cage has a two-piece design, with the two halves joined by chrome steel rivets.
The NSK bearings can be found in various sizes (shaft diameter 30–100 mm) and are designed to be used in each larger hydrogen pumping services and decentralised purposes, such as hydrogen filling stations.
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