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Dyson Videos/Articles - for Dyson HATERS only (Read 4635 times)
old-timer
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #90 - 04/18/07 at 7:05pm
 
Hi So if dyson did reposition the cyclones put the top at the bottom and bottom at the top,in reality what difference did it make.Was this just a make work project for the engineers?
 
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Carmine_Difazio
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #91 - 04/18/07 at 7:17pm
 
Quote from old-timer on 04/18/07 at 7:05pm:
Hi So if dyson did reposition the cyclones put the top at the bottom and bottom at the top,in reality what difference did it make.Was this just a make work project for the engineers?

 O.T.

 
Hello OT:
 
Dyson certainly did reposition the cyclones on the DC14 and models after.  As I stated on the Forum when the DC14 first came out (and I noted the flawed inverted cyclone design) it was detrimental to the effective operation of the cyclones.  Thanks to the law of gravity.
 
And another reason that a self-proclaimed dyson expert preferred the DC07 over all the others.  He was right.  
 
Adding cyclones helps. Regular maintenance/replacement of the premotor filters helps if users actually do this.  And now with the Euro-Pro Infinity washing the cyclones (which dyson forbids) keeps them working effectively.  
 
Why did dyson make the change?  Maybe some of the dyson experts can explain?    
 
Carmine D.
 
 
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #92 - 04/18/07 at 7:28pm
 
Quote from Carmine_Difazio on 04/18/07 at 6:28pm:
Wow, don't I feel stupid! All along I was giving dyson credit for correcting what I erroneously thought was a flaw in the DC07 cyclones. And come to find out (thanks to you) just the opposite is true. Dyson took a perfectly fine design and inverted it to make it functionally inferior.

Apparently Dyson inverted the cyclones in the DC14 and later because in their testing the new designs work better and/or are less prone to clogging. Why would inverted cyclones work better? To me it seems logical that the cyclones would be less prone to clogging with the big side down because dirt would easily fall out, and because it would be difficult for dirt to cling to the side walls. It seems to me, just as it does to you, that an inverted cyclone would be more prone to clogging. Certainly it would be more complex to build and more difficult to clean.  
 
As for why the inverted cyclones may work better, I'm just speculating here, but perhaps an inverted cyclone (with a hole at the bottom) would function very much like the primary cyclone, with the air going down around the outside, and coming up the center. The dirt would then settle to the bottom, and fall through a narrow opening into a collection chamber. In the more logical DC07 design, with the wider side down, as I think about it, the problem would seem to be that the falling dirt would tend to intersect the airpath, and could end up escaping the cyclone. Perhaps the heaviest of the dirt still light enough to get to the secondary cyclone (i.e. sand) would be heavy enough to fall into the airpath and escape, while the lighter dirt would have less tendency to do so. That would explain the odd tendency of the DC07 to allow some sand to get to the premotor filter while at the same time catching almost all drywall dust, a trait that I have always thought was bizarre.  
 
As I think about it, I guess, it doesn't surprise me that the inverted cyclones on the DC14 have less dirt escape and get to the pre-motor filter. As I understand it, the pre-motor now only needs to be cleaned annually instead of every 6 months (3 months in my use). As for their tendency to clog, I guess the real test will be real world use.
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JimB
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #93 - 04/18/07 at 7:41pm
 
I just have to catch up before trying to help.  It appears when they were first  inverted a critic stated it was a mistake and prefered the DC07 cyclone, this morning it was an improvement and the critic preffered the DC14 cyclone (and apparantely always had), and now the critic is back to the inverting being a mistake and feeling the DC07 more effecient.  A little dizzying but I can try to help.  
 
In the newer version of the cyclone the spinning action that causes the centrifugal force works down working with gravity and then the clean air exits up through the center of the cylcone.  The DC17 actually adds a third level of cyclones with new intermediary cyclones entered into the middle of the process.  As I understand it airspeed has also been adjusted in the cyclones to cause more effecient filtering.
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #94 - 04/18/07 at 7:43pm
 
Hello Carl:
 
Correct me if I'm wrong, which I have tendency to be now since I retired, but didn't you say that a clogged air filter works better than a new one because it keeps out more of the dirt/dust.  I think you were making an anology of a vacuum filter to a water filter, If I recall the post correctly?
Am I wrong?
 
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #95 - 04/18/07 at 7:44pm
 
To try to explain my comments above, I'll try to draw a text picture:
 
                        ^
                       /  \
                     /      \
                   /          \
                 /  |           \  
               /    |             \
             /      |               \  
           /        |                 \
         /         dirt                \
 
As a dirt particle falls from along the wall high in the cyclone, it would no longer be along the side wall. It might get caught in the air, re-spun, and cycle again, or escape.
 
By contrast, with an inverted cyclone, the falling dirt would remain next to the sidewall, and so long as it didn't actually stick to the sidewall, it should stay out of the airstream and slide through the hole at the bottom. Would it tend to stick, and clog? I don't know. Have the vac shops seen clogged DC14+ vacuums?
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #96 - 04/18/07 at 7:53pm
 
Quote from Carmine_Difazio on 04/18/07 at 7:43pm:
Correct me if I'm wrong, which I have tendency to be now since I retired, but didn't you say that a clogged air filter works better than a new one because it keeps out more of the dirt/dust. I think you were making an anology of a vacuum filter to a water filter, If I recall the post correctly?
Am I wrong?

Using a standard vacuum bag as an example, when new, a lot of fine dust passes through the bag. As more and more dust begins to pack the inside of the back, the dirt improves the filtration, and less and less dirt gets through the bag. Thus while all pollens would go right through a brand new bag, some would get caught in a full bag because it would stick to the other dirt. That's the positive side. The negative side is that less and less airflow also gets through, so the airspeed begins to drop. For the Dyson, where airspeed it critical to proper functioning of the cyclones, the loss of airspeed would be a much more significant loss than any possible gain from improved filtration.
 
As regards the advantages of an inverted cyclone, I'll defer to Jim. My theory is just speculation, and he may well have seen some actual literature from Dyson explaining the switch.
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JimB
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #97 - 04/18/07 at 7:54pm
 
Quote from cprohman on 04/18/07 at 7:44pm:

By contrast, with an inverted cyclone, the falling dirt would remain next to the sidewall, and so long as it didn't actually stick to the sidewall, it should stay out of the airstream and slide through the hole at the bottom.

 
Correct and the great force of the cyclone would be pushing it down and to the outside as well with the centrifugal force increasing as the turns became tighter at the bottom.
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #98 - 04/18/07 at 7:58pm
 
Quote from JimB on 04/18/07 at 7:41pm:
I...
In the newer version of the cyclone the spinning action that causes the centrifugal force works down working with gravity and then the clean air exits up through the center of the cylcone.

Yes, I see that now. In my text picture above of an inverted (DC07-style cyclone), gravity would tend to pull the dirt particle back down, into the airstream, whereas in an inverted design gravity would would in the same direction as the centrifugal force, tending to keep the dirt particle against the sidewalls, and separated from the airstream.
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Carmine_Difazio
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Re: Dyson Videos/Articles - for Dyson HATERS only
Reply #99 - 04/18/07 at 8:00pm
 
Quote from JimB on 04/18/07 at 7:41pm:

In the newer version of the cyclone the spinning action that causes the centrifugal force works down working with gravity and then the clean air exits up through the center of the cylcone.  

 
If that's true, and I believe it is, the narrow openings on the bottom of the cyclones are more proned to clogging when the vacuum is shut off.  Why? Centrifugal force and gravity are working together to force the dirt/dust in the cyclones to fall to the smaller openings and clog (after it is shut off).  Which makes the DC07 cyclone configuration more desirable.  Just as you said.  And the DC14 (and later) cyclone design more inferior.  
 
Carmine D.
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