초록 ▼

A vacuum cleaner includes a controlling valve in a ventilating path to a runner of an electric generator which rotates respondingly to a suction force, a rotating angle of the controlling valve is varied corresponding to an increase of the suction force so that an increase of the air flow across the

A vacuum cleaner includes a controlling valve in a ventilating path to a runner of an electric generator which rotates respondingly to a suction force, a rotating angle of the controlling valve is varied corresponding to an increase of the suction force so that an increase of the air flow across the runner is suppressed, thus an increase of a voltage generated by the electric generator is suppressed.

대표청구항 ▼

A vacuum cleaner comprising: a suction hose section; a motor for producing suction in the suction hose section; a suction pipe defining an air passing path, a first opening at one end of the air passing path, and a second opening at an opposite end of the air passing such that the air passing path c

A vacuum cleaner comprising: a suction hose section; a motor for producing suction in the suction hose section; a suction pipe defining an air passing path, a first opening at one end of the air passing path, and a second opening at an opposite end of the air passing such that the air passing path commmunicates with the suction hose section through the second opening, whereby suction produced in the suction hose section by the motor pulls air into the air passing path through the first opening, along the air passing path to the second opening, and out of the air passing path into the suction hose section through the second opening; a rotatable runner provided in the air passing path, the runner being rotated by air flow along the air passing path; an electric generator coupled to the runner such that the generator generates a voltage in response to rotation of the runner; and a control valve provided in the air passing path, the control valve being arranged to move to close the air passing path when the suction produced in the suction hose section by the motor increases beyond a predetermined suction, and to move to open the air passing path when the suction produced in the suction hose section by the motor decreases below the predetermined suction.