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Thread: Vacuum cleaner as a vacuum pump
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06-08-2008, 06:33 PM #1
Vacuum cleaner as a vacuum pump
On a local forum, I was asked by someone who tries to save money if he can use a vacuum cleaner instead of a vacuum pump.
Which makes me wonder, how deep can a vacuum cleaner can go?
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07-08-2008, 12:12 AM #2
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07-08-2008, 05:55 AM #3
Re: Vacuum cleaner as a vacuum pump
We used to test CA rooms for leaks with an old electrolux vacuum cleaner and some soapy water...but thats as far as I would go with one.
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07-08-2008, 03:27 PM #4
Re: Vacuum cleaner as a vacuum pump
Hi chemi-cool
800 mbar.
Might be worth checking with the Dyson technical helpline as they never loose suction!
Not sure if that stands when it is full up with fridge oil and moisture though
Sturt.
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08-08-2008, 01:29 PM #5
Re: Vacuum cleaner as a vacuum pump
Yeah no where near enough to cause moisture to boil off and be evacuated out. Which a lot of people dont know occurs, its not just about getting air out.
Why not attach a bag to a vac pump and use it for cleaning, it would take ages to go round the house with a set of gauges but a a bet you woulndt get a deeper clean, LOL.
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08-08-2008, 02:53 PM #6
Re: Vacuum cleaner as a vacuum pump
mmmmm its good question.vacume cleaner its designed to clean carpits at homes. vacume pump its desinged to drop down the pressur inside a/c close system to make a boling temperature for muster inside system withn ambaint tempereture.i sm sure that vacume cleaner cant drop the pressure insaide a/c system as vacume pump can do.
king
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08-08-2008, 05:59 PM #7
Re: Vacuum cleaner as a vacuum pump
Not to mention a Vacuum cleaner depends on a high mass flow of air to cool the motor, so depleat that for a short time and it catches fire.
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13-11-2008, 11:11 AM #8
Re: Vacuum cleaner as a vacuum pump
some people will try anything if it sounds right. it seems its not in south africa that we have chancers, the just walk past a fridge and all of a sudden they are fridge mechanics.
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13-11-2008, 07:14 PM #9
Re: Vacuum cleaner as a vacuum pump
Good point MG, I hadn't even thought of that. Apart from the idea being ridiculous in the first place it is also worth noting, as you have, that tools being used for purposes that they weren't designed for can lead to unexpected or even dangerous consequences!
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22-11-2008, 11:30 PM #10
Re: Vacuum cleaner as a vacuum pump
I built a project in 1983 while in my second last year in school, for the local science fair, I have a photo of it, but no means to scan it in, it was a home - made Crookes/Geissler discharge tube (anyone who did physics would know of these). Basically, a high voltage was passed through a vacuum in an effort to produce cathode rays, I used 2 old compressors (made by L. Sterne and Co. Ltd. somewhere in Scotland) taken from defunct 'Novum' chest freezers, they were plumbed in series, with their oil replaced by Alfa-Laval milking machine vacuum pump oil. I managed to pull a vacuum of 0.5mm Hg with these, it was enough for the 10 KV (from a Danfoss oil burner ignition transformer) to pass through the 24" glass tube and cause the rarified air inside to glow, plenty of lovely UV light as well - unfortunately I could not get the vac to go down further to produce the cathode rays but it did win a prize!
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23-11-2008, 08:09 PM #11
Re: Vacuum cleaner as a vacuum pump
that is the dumbest thing i have heard as it would not pull a vaccuum at all due to no oil resivoir to act as a lock to pull it down in the first place, no wonder systems fail...run out and feed the horse cowboy..lol
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25-11-2008, 03:15 PM #12
Re: Vacuum cleaner as a vacuum pump
Granted I was only 16 at the time! - It did pull the vac, but the compressors didnt last too long after a few demos ! Still have the trophy gathering dust in the attic. Must practice my John Wayne cowboy expressions and go to the principals office for a good caning now!
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Re: Vacuum cleaner as a vacuum pump
Never mind the vacuum cleaner.... there is this girl I know...................
-Cheers-
Tycho
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12-08-2009, 08:29 PM #14
Re: Vacuum cleaner as a vacuum pump
you know her too eh?
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12-08-2009, 09:12 PM #15
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13-08-2009, 04:58 AM #16
Re: Vacuum cleaner as a vacuum pump
You could use the positive pressure side of the vacuum cleaner to blow out coils thus avoiding hauling around imposter canisters of R22 for the same job as seen on another recent exhausted thread
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13-08-2009, 06:36 AM #17
Re: Vacuum cleaner as a vacuum pump
vacuum cleaner has no NRV hence if power shuts off , atmspheric air will rush in the system . besides, not enough vacuum can be pulled by vacuum pump resulting a lot of air being left in system .
Many technicians use the compressor in the system for pulling vacuum by front seating the dis valve , open the gage port for venting the air from system which compressor pumps out .Results are too bad on air conditioning & worst on low temperature application since 100% evacuuation is not possible ; left over air & moisture play havoc with system
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13-08-2009, 12:41 PM #18
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14-08-2009, 10:11 PM #19
Re: Vacuum cleaner as a vacuum pump
Hey glen1340, top marks for your response mate, Ive just had this great idear !!!!!!!!!!!!!!!!!!!!! Thanks mate"
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