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(11) | EP 2 208 454 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A damper assembly for a vacuum cleaner |
| (57) A damper assembly (50) for a vacuum cleaner, and a motor protection and dust emptying
time-notification method using the damper assembly (50), which introduce air into
a dust separating chamber (22) to increase a pressure in the dust separating chamber
(22) when a sub-atmospheric pressure is increased above a certain level in the dust
separating chamber (22) and which notifies a user of the exceedance of a limit, are
disclosed. The damper assembly (50) includes a casing (52) having an air inflow port
(54); a damper body coupled with the casing (52) and having an air outflow port (66);
a piston (60) disposed in the damper body (56) to be movable between a first position
and a second position, the piston (60) being movable towards the second position by
a change in air pressure in the damper body (56); a resilient member (68,70,72) for
resiliently pressing the piston (60) towards the first position; and a detection sensor
(80) to generate a signal when the piston (60) is in the second position. The piston
(60) blocks fluid communication between the air inflow port (54) and the air outflow
port (66) when in the first position, and permits fluid communication between the
air inflow port (54) and the air outflow port (66) when in the second position.
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