Does some one know working of vacuum cleaner?

A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from carpeted floors, but also from tiled floors and other smooth surfaces. Most homes with carpeted floors in developed countries possess a domestic vacuum cleaner for cleaning. The dirt is collected by a filtering system or a cyclone for later disposal.

source : wikipedia
Yeah, mine, it's a Dyson and it's fab !!
a vacuum cleaner uses a fast electric motor with a fan to vent air out of a compartment of the machine, with the result that air is sucked in on the other side.
intentionelly this side is held down to a carpet and along with all that air streaming into the compartment dust is sucked in too.
to prevent dust from being blown out through the motor older vacuum cleaners use one or more filters which sometimes start with a kind of paperbag where most dust is being hold back in, and a few other filters in different parts behind the paperbag.
modern vacuum cleaners are using flow dynamics and create a kind of tornado in their compartment which is capable to seperate dust from air with centrifugal forces. Those machines have filters too, but the advantage is, that they don't need any bags anymore

the word vacuum is misleading, cause actually there is not a real vacuum inside, the motor just creates some underpressure which is lower than the pressure in the surrounding atmosphere. as a result air tends to fill that up again.

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