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| Some interesting information on Ricor Cryocooler (K526S) Refill Device |
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| MrSheep:
After some thought and research, I think what is needed for this tool is a "Rod Seal" https://ahpseals.com/rod-seals/ It looks like they can withstand high pressures. Here is a tutorial on hydraulic seals. This is prob the same concept for what I am trying to achieve: Also to hold the rod seals a groove will have to be cut within a cylinder. Wondering if I should attempt this since I have a CNC or use a service for it. Apparently you can mill a groove using a special tool: |
| MrSheep:
Wow I went down a rabbit hole. Was researching some Sofradir detectors and ended up finding this channel who so happen to have the mysterious refill devices for both Ricor and Thales cryocoolers. This is the first time I've seen such device. |
| MrSheep:
Attached looks like the Fill/Purge adapter. Notice how there is no fixture. Just a turntable knob. After some thought I think I finally understand how this works :) Basically the turnable knob is attached to a hex key/driver. And there is a threaded cylinder in the shape of a Y. with a quick disconnect. This quick disconnect leads to the helium line of the machine. The machine is capable of pulling high vacuum on the cooler and periodically purging and filling helium to get rid of any contamination. Then finally it gets filled to the desired pressure of usually 20-35bar. You might ask yourself how do you refill such device without removing the hex set screw. Then that really got me thinking. And I came up with the conclusion that you don't need to remove the set screw entirely :), I was always under the assumption that you needed to remove it when filling. I believe when the set screw is loosened the gap between the screw and bore is large enough to let helium/vacuum in and out. This is probably why there is an indium seal at the bottom of the screw! So even if the tool and the set screw have the same thread diameter it doesn't matter since loosening the plug is all you need and set screw removal is not necessary. :) Maybe one of these days I will draft up something in fusion and perform some tests. |
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