Thread Number: 22077
Is your suction killing your airflow |
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Post# 247578 , Reply# 1   8/25/2013 at 05:40 (3,897 days old) by gsheen (Cape Town South Africa)   |   | |
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Suction and Airflow are competing forces in vacuum, as one goes up the other goes down, Remember that airflow or cfm is also greatly reduced by friction, IE thats why you will always have more airflow at the end of a 50mm hose compared t a 32mm standard vacuum hose.
Vacuuming is simply using pneumatic's to move something (dirt and dust ) from one point ( your carpet ) to another ( dust bag or bin) Too much suction and you wont be able to remove any dirt,when your vacuum reads maximum suction, it isn't moving any dirt , just suspending it, as their is no airflow to be able to move it along the hose, Massive airflow will move light articles with ease but wont be able to lift heavier articles. Thats why direct air vacuums work so well, because they have the brush to get the dirt out of the carpet and lift it into the airflow. The trick is finding the sweet spot, This is done with a flow charts to determin were the suction and airflow meet at their respective highest points, This is what vacuum engineers strive to achieve. Some massive truck mount carpet cleaning systems like the ones we have you can actually set the airflow and lift for different cleaning situations but adjusting the pully's between the motor and vacuum pump. you also have different nozzles for different styles of carpets some allowing more lift some more airflow |
Post# 247600 , Reply# 2   8/25/2013 at 08:46 (3,897 days old) by dysonman1 (the county)   |   | |
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The full bag indicator on the Miele is operated by pressure. That's why it moves to 'red' when you put your hand over the end of the hose. A TRUE measure is one that uses the pressure difference between the clean side of the bag (the compartment) and the inside of the bag. Electrolux perfected it, and no one has really copied Electrolux's method. That's why a Lux doesn't "pop open" when you put your hand over the end of the hose. The simple pressure reader, used on most vacuums (even tacony's) is a cheap, inexpensive way of trying to let you know when the bag is full. It has nothing to do with airflow. Only the build up of pressure (which we call "lift").
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