Patent ID: 6101667
Filing Date: 2000-08-15
Classification: A47L

Abstract:
A vacuum cleaner comprising:a dust suction passage for sucking dust and air;an air suction passage having one end which is connected to the dust suction passage and another end which is open to an outside air;an impeller within the air suction passage, wherein the impeller is rotated by a suction force within the air suction passage;an electric generator rotated by a rotation force of the impeller, the electric generator generating a voltage; andan air quantity adjusting valve for adjusting air quantity in response to an air pressure differential between the interior and exterior of the dust suction passage, wherein the air quantity adjusting valve is within the air suction passage, and wherein the air quantity adjusting valve includes(a) a guide shaft provided at a central section of an opening section of the air suction passage for placing the air suction passage and the dust suction passage in communication;(b) a valve body which moves along the guide shaft in a slidable manner in response to negative pressure within the air suction passage; and(c) a coil spring for pushing the valve body in a direction which is opposite to the direction the valve body moves due to the negative pressure, wherein the coil spring has a plurality of windings, some windings having a diameter which is different from a diameter of other windings.