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Turbo-V 2300 Pump loud noise and unnormal conditions

mx_zhu0116

Hello, we have a problem about our Turbo-V 2300 TwisTorr pump.

This pump is connected to a high vacuum chamber, some volatile materials are evaporated in this chamber, so we do often bake out process after deposition experiments to clean the chamber.

But recently, this pump starts to make a loud noise, power and current increase also, I show you in the attached video.

Could you give us some advices ? or we need to return this pump to factory for the exchange ? Thanks a lot

  • +1

    Hi,

    From listening to the video you sent (thanks!) it sounds like you may have a bearing issue.  The increased power and temperature also indicate there is some resistance to the turbo rotating causing the controller to put more power into the pump to maintain rotational speed.  More power equals more heat.  If the pump is making a high pitch whine during normal operation this is usually a sign that one of more of the phenolic cages that keep the ceramic bearings separated has failed.  The high pitch whine is due to two ball bearings rubbing against each other.  

    I would recommend shutting the pump down and getting an exchange.  You may notice that the sound goes away.  This happens when the ball bearings separate.  It doesn't mean that the pump is ok, it just indicates that the bearings are no longer rubbing together.  The whine will return at some point.  It is best to stop the pump or you could encounter catastrophic rotor failure (rotating blades made contact with the stator or side of the pump).that will not enable us to fix your pump, resulting in an increased cost to you.

    It looks like you are in France.  The number for the tech support group in our Torino office is (39) 011 997 9 111

    Let me know if this makes sense or if you have any other questions.

    Regards,

    Brian

  • 0 in reply to Brian Mess

    Hi, Brian, Thank you very much for your reply.

    May I have another question, since we evaporate an organic compund with bromine (CH3NH3Br) from a Knudsen cell, when it is heated to 200°C, this compund decomposes into small and volatile species, chamber pressure increases from 10-9 mbar (back ground) to 10-5 mbar (operation conditions).

    I suppose these bromides could create a lot of damage to the bearing part as you aforementioned, even I keep a low flow bearing purge N2 gas (< 1mbar), it doesn't help a lot I guess.

    To avoid more damage to turbo pump next time, maybe you could suggest another pump more suitable for halides and volatile materials ? or we need to install a cold trap between the vacuum chamber and the turbo pump to recondense volatile species ?

    Thank you for your time, sincerely,

    Best regards,

    Maoxiang

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