Abstract: The invention relates to a method for improving the classifying ability of cyclone. Wherein, it comprises overflow tube, cyclone room, taper, and deposit nozzle; the side of cyclone room is connected to the cyclone of arc cyclone tube, to feed material from the reducing cyclone tube into cyclone room; and open of cyclone tube is round; the interface between cyclone tube and cyclone room is upright flat tube; the round tube is transited to the upright flat tube; the cyclone tube has prolonged symmetry vertical tangents to narrow the width, while the arc edges of front and middle sections are held until to the end. The invention can improve its classifying ability.

Abstract: A simple cyclone model is presented as a new and modern tool for use in education and training in synoptic-dynamic meteorology. The model has been programmed on an IBM-compatible personal computer under DOS and is used as a teaching tool by the Royal Dutch Air Force and at the Department of Meteorology of Wageningen Agricultural University. The model is based on an approximate analytical solution of the equations of motion. This solution is capable of generating a realistic mature mid-latitude cyclone and its development in time. Several basic parameters of the solution can be varied, leading to different characteristic types of cyclone structure and development.

Abstract: A vacuum cleaner 100 includes a cyclone unit 200 installed in a mount 150 in the vacuum cleaner housing 110 The cyclone unit 200 includes a cyclone chamber 205 formed on the inside of the cyclone unit to separate dust from drawn-in air, and an entrance connected to a first channel 160 of the vacuum cleaner housing 110, leading drawn-in air into the cyclone chamber The vacuum cleaner housing 110 includes a fixing unit 300, which detachably fixes the cyclone unit 200 in position in the mount 150 by raising a section of the cyclone unit The entrance to the cyclone unit 200 is connected separatably to the exit to the first channel 160 in the direction in which the cyclone unit is raised by the fixing unit 300