h a l f b a k e r yOn the one hand, true. On the other hand, bollocks.
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Vacuum cleaners suck up dust and dirt
using a fan to create low pressure. Before
they can suck up the grime they have to
dislodge it for the surface to which it is
stuck. Several methods have been used,
from rotating combs in upright vacuum
cleaners to brushes on the end of the
nozzle for
the other kind (the one with
the hose).
The Coaxial Vacuum Cleaner would be of
the kind with the hose but at the centre
of the suction nozzle would be another
nozzle that blows air at high pressure to
dislodge the dust, dirt and grime which
would then be sucked up by the
surrounding vacuum nozzle. The
pressure of the blow nozzle would be
user adjustable depending on the surface
being cleaned (high to perk up and clean
carpets, low to dust and clean the
mantelpiece laden with Aunt Edna's
valuable china trinkets).
Why is this more effective than a vacuum
cleaner that just sucks? Glad you asked
me. The effeciveness of a vacuum cleaner
at dislodging dirt depends largely on the
pressure it can exert. By sucking, the
maximum pressure that can be exerted is
one atmosphere (the difference between
normal atmospheric pressure and a hard
vacuum). By blowing, much higher
pressures can be created exerting higher
forces and dislodging dirt more easily.
Similar to a scheme proposed in this brilliant idea
http://www.halfbakery.com/idea/VacuuMouse
OK, so maybe it's not all that brilliant. [half, May 23 2002, last modified Oct 05 2004]
(?) Leaf Blower thing
http://www.halfbake.../idea/www.flymo.com
Not ideal for indoor use though [drew, May 23 2002, last modified Oct 05 2004]
[link]
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This works - my leaf blower/sucker thingy does exactly this. Works much better than when it just sucks. |
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half: It appears that I didn't get here first. I hope you don't mind if my posting stays as a generalisation of yours. |
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drew: Any chance of a link/model number - I've never seen anything like this. |
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all: If drew's got a leafblower that does this then maybe it's made it into the computervacuum type product. Has anybody seen one with simultaneous suck/blow? |
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[st3f]: Nah. My original idea was just a floating mouse. [UnaBubba] came up with the vacuum bit so I can't claim it anyway. |
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I have previously considered the scheme you propose and have never seen it baked either. I wonder, in the coaxial arrangement, how much of the pressurized air would get sucked immediately back in to the vacuum part, thereby negating the effectiveness of the vacuum. |
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Just checked - it's a Flymo Gardenvac 1500 plus. |
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It can just blow, or just suck, or blow and suck - this setting gets the wet leaves off the ground, then it instantly sucks them into its shredder. Neat. |
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Why don't uprights have a clutch for the beater brush? Am I the only one who consistently sucks up throw rugs when vacuuming edges/corners? Just a little squeeze trigger is all I'm asking for. |
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bliss: After Mrs drew insisted on spending/wasting billions on a flashy bagless vacuum cleaner with molecular filters and other bells/whistles, the leafy thing stays outside. Until she's out, then I'll try it. |
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Errr no.... How would I sneak it inside for a quick test if she's out with the electric broomstick? |
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[drew]: Flymo, I think that's the company that built a lawnmower I used once. It had no wheels (hence the name "Flymo"). Based on my experience, I hope they've drastically improved since then. |
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I used to have one too - useless, except on a very small very flat garden. Think hovercraft, with all the power of a hairdryer. |
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This wouldn't be the only thing I've seen in my lifetime that both sucks and blows... |
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You mean like a girlfriend I had once with a stopped up nose; she blew when she sucked and sucked when she blew. |
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