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  • high accelerations causing excessive stress on rings around pressure vessel.

    Discussion in 'Industrial design' started by MSHOfficial, Jan 13, 2019.

    1. MSHOfficial

      MSHOfficial Well-Known Member EngineeringClicks Expert

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      Hello everyone,

      I have a pressurized container, that are held by 2 rings in place and a motor rotates it on its z-aixs. Since the material inside has very high viscocity. The material distribution during the rotation is not equal and this causes high stresses on the rings. Much higher than we expected initially. What are some ways we can reduce these stresses. Will rotating the cylinder slower make a difference? we would prefer to rotate it faster though. we cannot change the shape of the rings but we can add cushioning inbetween the ring and the vessel (because the ring is like a y shape, we can add small ball bearings thats might be able to transfer less stress to the rings, but we are not sure how it would turn out, if you guys have any experience regarding this please help). also if there are any other ways you guys could think about, I am open to suggestions.

      thanks in advance.
       
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    3. SenthilJPrakash

      SenthilJPrakash Member

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      A sketch or a picture would help us visualise the design and understand the issue.
       
    4. Mark_Armstrong

      Mark_Armstrong Member

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      I second the request for a sketch.

      That said, a slower speed should reduce the unbalance. Can you increase the speed slowly to allow the material to redistribute itself?
       
    5. Mark_Armstrong

      Mark_Armstrong Member

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      Is this an expeller? A centrifuge? Are you trying to separate the material?
       
    6. MSHOfficial

      MSHOfficial Well-Known Member EngineeringClicks Expert

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      upload_2019-1-20_16-46-29.png
      I understand you guys want to see a sketch but I dont have a sketch, but I tried my best to show you guys. so assume this is a symmetric cylinder and the whole thing is rotating around the center. The red circle is the disc that is the point of discussion here. the material inside is being mixed under 1,5 bar pressure. I dont have information about that except that the viscocity is around 22000 centipoise. the rotations start from 0 and reach 1500 rpm and at that speed the materials are somehow causing unequal stresses on the disc. The whole cylinder is supported at the disc by the way. its hanging basically throught the disc.
      upload_2019-1-20_17-1-38.png
      the attaching point is something like this. the rotating motor in attached on the top.
       

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