New New Backing Pump

A project log for Glass Tube Solar Thermionic Converters

Thermionic energy conversion isn't very efficient (it's also nothing new) but they *are* photovoltaic devices you can build with a torch

nick-pooleNick Poole 05/26/2022 at 02:281 Comment

I let the vacuum geeks talk me into a real backing pump and got this Welch 1402 for a good deal on eBay. The seller didn't know whether it worked, or what condition it was in. All they could say is that the motor runs and the pump feels like it pulls a vacuum. It looks good.

Well... it looked good, until UPS got their hands on it...

Luckily, the damage appears to be limited to the pulley and the oil mist filter. The seller offered to buy me a replacement pulley and so I found a used pulley of the same vintage and we got it sorted out. The new pulley arrives tomorrow. 

Before we can get this hitched to the turbo, we'll need to do a few things: 

As soon as all of these things are done, I'll post an update. This should improve both our pump-down speed and ultimate vacuum, so it's worth the effort.


tywy wrote 06/11/2022 at 16:47 point

The question is how much vacuum it gives. a simple 1bar pump is about 300zł == 69$

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