DEVICE FOR PROTECTION OF VACUUM CLEANER MOTOR Russian patent published in 2008 - IPC A47L9/00 

FIELD: personal demand and household items.

SUBSTANCE: according to the first version, the device for motor protection incorporates an engine section, a through-hole, a valve element and a cover with connecting and bearing parts. The through-hole is made in a dividing wall which surrounds the engine section. The valve element can switch from the first position, in which it closes the through-hole, to the second position, in which there is a space between the valve element and the through-hole. The cover is capable of connecting to the inner periphery of the dividing wall and of surrounding the valve element. The inner periphery of the cover has an inclined surface set on the inner periphery of a coupling component. The cover internal diameter gradually increases while the valve element switches to the second position. The distance between the cover inner periphery and the valve element is minimised when the valve element is in the first position. The second version of the device differs from the first version by the ratio of cross section area of the valve element to that of the through-hole. The third version of the device differs by position of the valve element which is next to the through-hole.

EFFECT: prevention from motor overheating.

13 cl, 8 dwg