NSK Europe, 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 such as hydrogen and LNG.
NSK has developed special shaft bearings with a cage made 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 increasing adoption in submersible pumps as a rising number of initiatives promote using hydrogen as an vitality 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 critical design component. Corrosion resistance is crucial, and no lubricant can be utilized other than the media washing across the bearing. However, this locations robust calls for on the material pairing.
So NSK has developed a sequence of deep groove ball bearings specifically for these distinctive operating conditions, and several other key design features present differentiation from standard pump bearings. For example, the inside and outer rings are manufactured from a stainless-steel tailored to the particular necessities of rolling bearings.
A stable cage that occupies the entire inner volume of the bearing offers steerage for the rolling components (also made of 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 extraordinarily 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.
เครื่องมือที่ใช้วัดความดัน are available in various sizes (shaft diameter 30–100 mm) and are designed for use in each bigger hydrogen pumping services and decentralised functions, corresponding to hydrogen filling stations.
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