Vacuum Cleaners Discussions

Surprised no dyson admirers answered.  Airblade?  Anything to say?

The largest shrouds I saw are with vacuums of years gone by.

The Lewyt and Filter Queen bagless canns of the 40's.  Tho, I doubt

they called them shrouds.  The full circumference of the vacuums

and probably half the volume of the bottom dirt container.

Carmine D.

Hi

I'm surprised too.  Thought someone would have known the answer to this one.  Do you get where I am coming from, why would a vacuum cleaner manufacturer not make use of the bin capacity, the shroud is so big in Dysons and the MAX mark is rather low down compared to the first generation of UK Dyson in the late 90s.  These are 4 lites and the shroud was never that big but these where DUAL CYCLONE machine.

Hello Bucks03:

I'm with you.  BTW, Filter Queen and Lewyt

called the shrouds: "Circular shields."  Made of aluminum. 

Paper thin filters called 'cones' [because of their shape] was the

only separation of the shroud from the

dirt.

Carmine D.

Yes the cyclones block after a certain time,i just wish they were easy for the owners to clean ............

MOLE

Mole I understand what you are saying but I am also refering to the Uprights not just the cylinder machines.  Also the shrouds were smaller  on the first models which were able to produce a large amount of scution power, look at The DC07, its shroud isn't that big and it was the most pwerful Dyson in the UK even when they started putting 1200Watt motors as opposed to the 1400Watts they used to use before.  Only Dyson engineers have the answer to this answer. 

I have never encountered a problem with cyclone blocking on my DC04, DC05 or handheld DC16.  The only problem I ever have is that long hair escapes from the cyclone and when I take out the filter there is long hair on it, this isn't an issue.

Hi Carmine,

I see the mechanisms as different.  Filter Queen and Lewyt's filter paper and/or cellulose cones were intended to be a physical barrier between the fan chamber and the contents of the dust container in lieu of the conventional dust bags they did not employ. Their conical shaped filters allowed more filtering surface than competitors of  similar ilk at the time like Fairfax and Silver King.  Both of those brands employed flat, round filters that fitted between their dust containers and motor units.    The metal cones in the FQ and Lewyt served more to make the conical filters keep their form. 

So-called cyclonic action was employed to help keep dirt off the filter cones by the air swirl produced when air entered the dust container. Air was deflected to the left, at least in Filter Queen, with the intention of keeping dirt collection on the cone to the minimum and suction to the maximum because of the whirling air.  I know from experience that this works for a time but eventually dust, fluff and debris begin to build up behind the deflector eventulally reducing the usable surface area on the filter cone.  This did not prove a serious problem to me as FQ can maintain good suction and clean well nder normal conditions for a good amount of time even if the ideal "cyclonic situation" isn't happening internally.

In true cyclonic bagless vacuums, if there is such a term, the intention is to use the centrifical force of induced air-swirls to fling off the dust and dirt carried into the machine to such a degree that minimal filtering medium is all that's needed to capture dust still in the air stream after it exits the dust container.  As I said, that's the intention but once the shroud begins to collect debris -- fluff, hair, bits of paper, etc. -- cyclonic filtering capability decreases and residual dirt in the air stream after the process increases.  That is why frequent emptying is required AND why I don't necessarily feel that much ahead of the game on way or another due to it.   I'd be glad to see this same technology applied to a portable machine with larger dust capacity than generally available today to help keep the principles used for cyclonics at their optimum with less need for emptying. 

Best,

Venson

Any Comments....................

MOLE

Hello Venson:

Similar in that today's shroud, as on dysons, separates the large debris in one cyclone

from the 2 nd intermediary and 3rd fine cyclones.  The paper cones serve this purpose in addition

to the perforated conical assembly keeping all the dirt large and small from the motor. Particularly

if the users did not dump the base regularly, which we know is a dyson [bagless vacuum] caveat.

Interestingly, Lewyt [do it] changed to the see thru speed saks in the very early 50's.  And still claimed these

as superior to dust cloth bags. 

BTW, dyson in its product literature claims it's the only true cyclone vacuum.

Carmine D.

Bucks03;

As I said, I'm with you.  The DC07 perorated shroud is much

smaller than the DC14 and DC15.  The DC17 reverts back to the smaller DC07

shroud and perforations area than the DC14 and DC15.  As I mentioned in the HSN

dyson demo, dyson Dave made sure the the big

debris [cat litter which he suctioned up using the hose] was off the shroud perforations

by leveling off the dirt bin contents.  Then, he proceeded to vacuum up the pet hair in

rug mode and the coffee grinds in bare floor mode.  This maneuver was key to the demo.

Had he not, the intermediary and fine dirt/debris would not have made it to the 2-3 cyclones.

Did you email dyson and ask about the shroud sizes and perforations? 

Carmine D.