Vacuum Cleaners Discussions |
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CarmineD
Joined: Dec 31, 2007
Points: 5894
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Re: Clear Sebo
Reply #49 Jun 8, 2009 7:30 am |
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Carmine, the principle "Model2" speaks about, is the method used by 'clean air' uprights such as Sebo and cylinder cleaners. I think you are mis-reading the Sebo diagram.
Basically, (and you should know this), the motor expells air from its exhaust, creating a corresponding pressure drop at the motor intake and associated ducting upstream of the motor. This includes the bag chamber.
Since nature abhors a vacuum, air rushes into the bag chamber at great speed, carrying dirt and dust as it comes. Placing a filter-bag at the entry point allows the dust to be captured, but the bag has to be permeable (that is to say, the bag must allow air to pass THROUGH the bag).
If the bag sits directly upon the pre-motor filter, there is a chance that suction will be compromised as the motor will struggle to pull air through the bag which will be filling with dirt and dust. Hence the reason for the vertical tubed pre-motor filter.
With reference to the Sebo diagram, dirt-laden air is sucked up the hose (shown at the rear of the tubular pre-motor filter), into the bag. Filtered air is then sucked towards the adjacent tubular filter, then down into the motor intake, through the (unseen) motor, then expelled to the atmosphere via the micro-filter.
Thank you Trilobite. My basic question on the clear SEBO, and any vacuum motor, drawing/not drawing air through the bag was to ensure that we were all on the same page. Model2 is discussing dirt by-path vacuums, like the clear SEBO, and not the original vacuum design and operation using a fan first and bag last operation. I know the difference  I wanted to make sure all others reading here know too. Some may/may not be versed in vacuum operations. The diagram by Model2 and posts by Venson about Lux and Air-Ways and retardturtle1 about RICCAR assist in clarifying Model2's post also. Thanks to all.
Carmine D.
This message was modified Jun 8, 2009 by CarmineD
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CarmineD
Joined: Dec 31, 2007
Points: 5894
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Re: Clear Sebo
Reply #50 Jun 8, 2009 8:13 am |
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The great thing about the Sebo design is that the bag doesn't cover the pre-motor filter, so the motor's not having to pull air down through the bag. The filter is at the side, so the suction stays 'stronger for longer.' When you empty the bag, it's solid like a brick, packed right to the top. When you put a new one in, it's amazing how much lighter the cleaner feels!
Just so we understand where we are now, Model2, I posted your original statement which says that the clear SEBO motor, due to the design of the side mount filter, doesn't have to pull air down through the bag. You revised this statement in a subsequent post to say that the clear SEBO motor draws air from the bag/bag compartment. I opined probably a result of the diagram you posted and I commented on. Thank you. On the surface, these two statements appear to be contradictory. I'll overlook the discrepancy and presume that you meant to say the clear SEBO motor draws clean air from both the bag and bag compartment [your revised answer]. I posted questions for you to answer about dirt by pass design and operations based on drawing air from both.
Carmine D.
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