For 300-degree hot oil centrifugal pumps, how can the impeller nut be secured when the medium experiences sudden temperature changes, and how can loosening be prevented?
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How to prevent the locking nut of the impeller in hot oil centrifugal pumps from loosening! ? ?
Ours is the same – the bolt is loose; screws were used to secure it, and later the nut was welded directly in place. A screw cap is used to hold it in place, but it’s still loose
Choose materials with similar expansion coefficients for the impeller, shaft, and nut
I think it’s also due to the poor quality of the materials; small manufacturers tend to have this problem. Five or six years ago, after preheating the pump, it was still necessary to tighten it by hand using a wrench. In recent years, I’ve been using pumps from large manufacturers, and those pumps don’t even require thermal tightening
300 degrees is considered a high temperature for moving equipment; what you need to do is to keep the pump running at a constant temperature as much as possible. What causes the fluctuations in temperature, is it a requirement of the manufacturing process? I don’t think it’s possible; in that case, 2 pumps would be better ； Shut down the pump frequently; it can run without shutdown for short periods by switching to reflux mode ； The medium is unstable; this needs to be considered from a process perspective ； For specific situations, it’s best to start with the specific issues
For medium pump shafts operating at over 300 degrees, what material do you choose?
The material you mentioned might be correct; I wonder what material would be suitable for a pump shaft that operates at temperatures over 300 degrees!
The temperature should be stable; the device experiences frequent fluctuations, so the temperature is unstable
Whether the screw is installed axially on the shaft head or on the thread, it seems to be less effective than a thrust washer
A butterfly spring is installed at the end of the sleeve that does not come into contact with the medium.