Separation system for vacuum cleaner and vacuum cleaner comprising the separation system

A separation system for a vacuum cleaner, the separation system comprising:

• a cyclone tube having a cyclone chamber and an inner wall having a substantially cylindrical appearance defining a center axis;
• an inlet channel offset with respect to the center axis for receiving dust laden air;
• a dust outlet for discharging dust from the cyclone tube;
• an air outlet for discharging air from the cyclone tube;
• and
• a helical member arranged within the cyclone tube in an opposite region of the cyclone tube with respect to the air outlet, the helical member defining or partly defining a helical passage around the center axis from the inlet channel to the cyclone chamber for generating a centrifugal flow in the cyclone chamber;
• wherein the helical passage has a substantially constant cross sectional area and the helical passage is rotated 360° or less than 360° around the center axis;
• and
• wherein the inlet channel is spaced from the cyclone chamber along the center axis, and the helical member comprises a vane member having a successively decreasing thickness along the center axis towards the cyclone chamber.

A separation system for a vacuum cleaner, the separation system comprising:

• a cyclone tube having a cyclone chamber and an inner wall having a substantially cylindrical appearance defining a center axis;
• an inlet channel offset with respect to the center axis for receiving dust laden air;
• a dust outlet for discharging dust from the cyclone tube;
• an air outlet for discharging air from the cyclone tube;
• and
• a helical member arranged within the cyclone tube in an opposite region of the cyclone tube with respect to the air outlet, the helical member defining or partly defining a helical passage around the center axis from the inlet channel to the cyclone chamber for generating a centrifugal flow in the cyclone chamber;
• wherein the helical passage has a substantially constant cross sectional area and the helical passage is rotated 360° or less than 360° around the center axis;
• and
• wherein the air dust outlet extends through the inner wall of the cyclone tube in a radial direction perpendicular to the central axis, and the air outlet extends axially from the cyclone tube along the center axis.