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Vacuum pump or my maddest modding project yet.
Henning:
Hi all!
I sincerely hope there's someone with an understanding of vacuum and vacuum pumps out there, as i am utterly lost!
Here's what i'm trying to achieve or the design brief if you will:
Make a vacuum pump setup that will enable me to vacuum form wood, plastics and cf/fibreglass. In addition a vacuum holding setup. Something along these lines: http://www.axminster.co.uk/bagpress-pro16-electric-vacuum-press-prod810324/
I have already managed to source a pump. I got this one free from a friend of mine, it's a Busch industrial quality rotary vane pump, where the vanes are running in oil.
:worthless:
Here's the main pump:
and the other side:
All signs on the pump:
Switch (or something?)
Motor:
and pump:
Here's the main questions i have this far:
1. Would this be a pump for continuous running?
2. What does the Bürkert 3/2 solenoid valve do? Does it redistribute the vacuum to the open port when the vacuum is reached or?
3. Would this pump be suitable for vacuum forming? I have read on the 'net some suggestions this is one of the worst pumps to use for this...
4. What does the 20 mbar on the pump mean? Is this the vacuum pressure? In which case it's waaaaay to low, isn't it?
ANY and all help would be most appreciated as i'm clearly out on deep water here. It seems i lack even the most basic knowledge of vacuum pumps and vacuum... :doh:
Thanks in advance!
Bernd:
This may not be the answer your looking for but I made a quick vacuum pump using a refrigirator compressor/vacumm pump. Here's the link to my web site.
http://www.kingstonemodeleng.com/MachineShop/vaccum/vaccum.htm
Might give you some ideas. Oh, and it was cheap too. :clap:
Bernd
fixerup:
Hi,
1. Would this be a pump for continuous running?
Has long has there is no major leaks, I think it would be ok to run continuous. Touch the casing, you should be able to leave your hand on it. Make sure the pump oil is topped up. Note: you need vacuum pump oil, not motor oil.
2. What does the Bürkert 3/2 solenoid valve do? Does it redistribute the vacuum to the open port when the vacuum is reached or?
no idea
3. Would this pump be suitable for vacuum forming? I have read on the 'net some suggestions this is one of the worst pumps to use for this...
Maybe they say it is the worst pump, because they are forming very large mold. For smaller stuff I can't see a problem, from your specification tag picture I can see 1370 L/min and that is not bad.
4. What does the 20 mbar on the pump mean? Is this the vacuum pressure? In which case it's waaaaay to low, isn't it?
That is correct. 20 mbar is equivalent to about 8 inch of water of vacuum. Most rotary vane pump can pump to 20 mbar the difference between pump is how fast.
Hope this helps,
Cheers!
Phil
Henning:
Thanks for the replies, chaps!
Nice work, Bernd!
--- Quote from: fixerup on October 25, 2011, 01:14:07 PM ---Hi,
1. Would this be a pump for continuous running?
Has long has there is no major leaks, I think it would be ok to run continuous. Touch the casing, you should be able to leave your hand on it. Make sure the pump oil is topped up. Note: you need vacuum pump oil, not motor oil.
--- End quote ---
There's special oil for this?
--- Quote from: fixerup on October 25, 2011, 01:14:07 PM ---2. What does the Bürkert 3/2 solenoid valve do? Does it redistribute the vacuum to the open port when the vacuum is reached or?
no idea
--- End quote ---
I found a user manual for the solenoid. It seems to me it takes the vacuum off the chamber when it's reached the setting. This is set for a specific pressure, presumably, but can probably be taken off it can run continous.
--- Quote from: fixerup on October 25, 2011, 01:14:07 PM ---3. Would this pump be suitable for vacuum forming? I have read on the 'net some suggestions this is one of the worst pumps to use for this...
Maybe they say it is the worst pump, because they are forming very large mold. For smaller stuff I can't see a problem, from your specification tag picture I can see 1370 L/min and that is not bad.
--- End quote ---
would that be how much air it evacuates on max?
--- Quote from: fixerup on October 25, 2011, 01:14:07 PM ---4. What does the 20 mbar on the pump mean? Is this the vacuum pressure? In which case it's waaaaay to low, isn't it?
That is correct. 20 mbar is equivalent to about 8 inch of water of vacuum. Most rotary vane pump can pump to 20 mbar the difference between pump is how fast.
--- End quote ---
Any chance you can tell me how much that would be in Torr or inches/mercury?
--- Quote from: fixerup on October 25, 2011, 01:14:07 PM ---Hope this helps,
Cheers!
Phil
--- End quote ---
Helped a whole lot! Thank you very much!
DaveH:
Hi,
15torr = 20mbar.
Because 1torr = 1.333mbar = 1mmHg (near enough)
:beer:
DaveH
PS. 1 Standard Atmos = 760torr = 760mmHg =1013mbar
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