I see what you are getting at, it is not directly a rotating seal, it is a static seal that allows for rotating motion to be translated. There is no slip at all in this joint, it is a 100% rigid coupling and can transfer much more torque then a normal magnetic coupling. As well as at much higher speed then O-Ring seals. It is a neat way of converting motion through a 'rigid' seal. :)
Thanks for showing this, but I wonder if you're not addressing perhaps the most important part of this mechanism. That is, the long vacuum-side rod needs to be bent inside the bellows. The bellows itself doesn't rotate (as you say) - but "pushes" the bent tp of the long rod in a circular motion... which rotates the long rod. Either that, or I'm missing something entirely. Thanks again!
I see yes could be very useful. I see now from the drawing in the link, I thought the vacuum and atmosphere ends where reversed. I assume this device would work equally well with high pressure vs atmospheric?
I also had the same feeling, but as far as I could understand, "inside" the flexible seal theres the cardan joint (the rusty one he showed), that only converts the motion circular motion if there's a angle in the input. I'm looking for a 3d animation to be sure but couldnt find yet
Hmmm thats not actually a seal though is it. Thats just a really weirdo drivetrain connection for no apparent reason. The seal is inside the metal casing part. The weird drive train is likely there so if the shaft is obstructed it can slip without causing damage.
As far as I undrestand the flexible connection could be some sealing material like Leather/plastic (since that part is not actually rotating), and inside that metalic flexible part is hidden the cardan joint. So if I understand correctly, it will only have rotation if there's a angle on the input shaft
