Vacuum Cleaners Discussions

CarmineD wrote:
Hello Carmine, you're welcome.

Well the bag is big enough - standard fit 5.5 litre/6 litre capacity which is similar to Miele's S7.
Don't forget guys that although Sebo are in the U.S they also the old X1 Automatic under the Windsor tagm Windsor Sensor models infact. I believe there's a Dart model too, commercial version of the Felix under a different name too.

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!

Model2 wrote:

Model2:

Is your point that a vacuum's motor, not just SEBO, pulls the air through the bag?  Would you mind explaining to me how that works?  I thought the motor pulls up dirt.

Carmine D.

CarmineD wrote:

Are you asking me to explain the clean-fan (as opposed to the direct-air/dirty-fan) design principle? Or the difference between Sebo's pre-motor filter design (placing the filter's huge surface area beside the bag - see diagram) and the more commonly-seen design, whereby the pre-motor filter is located under the bag?

Model2 wrote:
hi Model2......wouldnt  panasonics optiflow system not produce the same results as the sebos side intake...or riccars tandem air set-up is similar as it has the side intake..diff system i know but same idea...increases of suction from that side intake are how much over the optiflow or any other bottom type? not looking to debate...just curious.

retardturtle1 wrote:

Other brands may well have similar designs; I'm not claiming the Sebo is entirely unique (although I can't think of anything else on sale in the UK with a similar set-up), I was simply making the innocent comment that it's one of the Sebo X-series' strengths that the suction stays relatively constant as the bag fills. That's all! Sebo have been on the mainstream market in the UK since the early 90s. 'Which? Magazine' currently rate them as the most reliable upright brand, and the highest upright brand for customer satisfaction. 'Which?' rate their performance as rather mediocre, which concurs with my own opinion of them. However, I do find that the power stays relatively constant as the bag fills.

I'm not familiar with the Panasonic Optiflow system, so I couldn't comment on that. Could you post a diagram which shows how that works? The core principle of the Sebo system is that the bag doesn't sag over the filter as it fills with dirt, so the motor's not compromised pulling air down through layers of whatever dirt's already in the bag to a filter smothered underneath. If the Panasonic system is similar to that, then the answer's probably yes. The Sebo doesn't offer extra power over other machines, in fact, I feel it's weaker than many. It just stays at a more constant rate as the bag fills, for the reasons I've explained.

Model2 wrote:

Model2:  I didn't mention direct suction dirt path and/or by-pass dirt path cleaning [as is the case with attachment cleaning].  I'm asking how a vacuum motor, SEBO or any other vacuum motor, pulls air through the bag into the motor and at the same time pulls dirt into the bag.  How does that work?  Explain it for me, please.  The diagram you posted is the dirt/air path to the bag not the air path to the motor.  Am I right?  I see no filtered air pulled through the bag and going into the motor.  I see air leaving the bag and going into the dirt path nozzle.  Do you see that too in your diagram?

You posted WRT the SEBO pulling air through the bag by the motor:

Model2 wrote:

Your post and the diagram appear to be contradictory.  The diagram you posted shows no air pulled into the motor from the bag.  Is your point that other vacuums do this [pull air through the bag into the motor], but SEBO doesn't? 

Carmine D. 

Hi Model2,

I'm not as good as the rest of the guys with the image uploading thing yet but attached below is a link to the Panasonic website re the "Optiflow" thing. Actually this is nothing at all new. Bagged American vacs like Electrolux and AirWay had been employing the idea for years and years but not saying a lot about it.

Now defunct Air-Way resembled a tank-type vacuum (a long, cylindrical or rectangular in shape machine pulled around on on wheels or sliders) but was designed to stand vertically when in use. It's metal bag chamber had a cylindrical outer wall with an inner wall of perforated metal. A round filter was at the bottom of the bag chamber and it also had a round perforated cover to keep the bottom of the dispoable bag from sitting directly on it. The whole idea being meant to facilitate airflow from all sides of the dustbag.

Ye old and ancient Electrolux Model XXX by design allowed plenty of room around its permanent bag but with the change of design that came with the Model LX and the self-sealing disposable bag a bag chamber and new look were adopted. From that point on the Electrolux bag chamber was an internal rectangular single wall "cage" with perforations on all sides and at the bottom. This too intended to allow air movement from all freed up parts of the bag as it filled. It appeared to work. However, the idea was abandoned with the coming of the Model 1205. It also had a bag chamber that conformed to the shape of the rectangular bag but instead of perforated metal, it was of molded plastic with deep "ribbing" within its interior to help keep the bag walls from lying completely flush against any of its sides. There was just a single port for air exit.

In regard to either brand, another good point that never got played up was that paper bag breakage was nil.

http://www.panasonic.com/promos/video/vacuum_cleaners/optiflow.html

Venson

CarmineD wrote:
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.