Patent ID: 7503458

Claim:
A cyclone comprising: a body including an inlet passageway for introducing a fluid, a cylindrical passageway that has an upper end for exhausting first particles in the fluid and a lower end, and a conical passageway that has an upper end connected to the lower end of the cylindrical passageway and an opened lower end for exhausting second particles having a specific gravity heavier than that of the first particles; and a vortex finder inserted into the upper end of the cylindrical passageway, a first exhaust passageway for exhausting the first particles, which spirally ascend from the cylindrical passageway, formed through the vortex finder in a vertical direction, wherein the cylindrical passageway has a length in the vertical direction of about 0.5 times to about 2 times a diameter of the cylindrical passageway, and the conical passageway has a length in the vertical direction of about 5 times to about 9 times the diameter of the cylindrical passageway, wherein the vortex finder further comprises a second exhaust passageway connected to the first exhaust passageway to exhaust third particles having a specific gravity heavier than that of the first particles and lighter than that of the second particles.