A vacuum cleaner ( 1 ) comprising a housing ( 2 ) being separated in at least a dust compartment ( 4 ) and a motor compartment ( 6 ). The vacuum cleaner ( 1 ) also comprises a motor ( 7 ) located in the motor compartment ( 6 ) and an air guide ( 8 ) between the dust compartment ( 4 ) and the motor ( 7 ). The motor ( 7 ) is suspended in the motor compartment ( 6 ) by a suspension system comprising at least one spring ( 23 ).
1. Vacuum cleaner ( 1 ) comprising a housing ( 2 ) being separated in at least a dust compartment ( 4 ) and a motor compartment ( 6 ), the vacuum cleaner ( 1 ) also comprises a motor ( 7 ) located in the motor compartment ( 6 ) and an air guide ( 8 ) between the dust compartment ( 4 ) and the motor ( 7 ), wherein the motor ( 7 ) is suspended in the motor compartment ( 6 ) by a suspension system comprising at least one spring ( 23 ), wherein the natural frequency of the suspension system including the motor is at least 3 times lower than the excitation frequency of the motor ( 7 ) whilst the spring ( 23 ) has a damping less than 1%, the values for the suspension system being valid in all six degrees of freedom of displacement.
2. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that the damping is less than 0.5%, preferably less than 0.1%.
3. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that at least one spring ( 23 ) has a stiffness at least ten times higher than the stiffness of the flexible air guide ( 8 ).
4. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that all dynamic forces of the motor ( 7 ) travel to the housing ( 2 ) via the spring ( 23 ) and/or the air guide ( 8 ).
5. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that the motor ( 7 ) is suspended by at least two springs ( 23 ) being fixed to the motor ( 7 ) located near the centre of gravity of the motor ( 7 ).
6. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that the motor ( 7 ) is suspended by at least three leaf springs ( 23 ).
7. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that the spring ( 23 ) is a metal spring.
8. Vacuum cleaner ( 1 ) according to claim 1 , comprising in that the air guide ( 8 ) is a flexible air guide ( 8 ) comprising a first ring-shaped element ( 31 ) connected to a separation wall ( 5 ) between the dust compartment ( 4 ) and the motor compartment ( 6 ), a second ring-shaped element ( 32 ) connected to the motor ( 7 ), which second ring-shaped element ( 32 ) has a diameter smaller than the diameter of the first ring-shaped element ( 31 ), the air guide ( 8 ) further comprises a dome-shaped membrane ( 33 ) between the first and second ring-shaped elements ( 31 , 32 ).
9. Vacuum cleaner ( 1 ) according to claim 8 , comprising in that in axial direction the ring-shaped elements ( 31 , 32 ) are located at a distance of each other.
10. Vacuum cleaner ( 1 ) according to claim 8 , comprising in that the air guide ( 8 ) comprises a bellow ( 42 ).
11. Vacuum cleaner ( 1 ) according to claim 8 , comprising in that the spring ( 23 ) is connected to the motor ( 7 ) by means of a bracket ( 21 , 22 ).