| 摘要 |
The present invention relates to a dry vacuum pump including a screw rotor and a groove. The dry vacuum pump comprises: a driving screw including at least three rotors rotating around a driving shaft; a driven screw including at least three rotors rotating around a driven shaft and rotating by being engaged with the driving screw; and at least two grooves formed on a casing including the driving screw and the driven screw and the inner circumference of the casing. The driving screw includes first to fifth rotors of the driving screw in order from a fluid suction unit to a fluid discharge unit. The driven screw includes first to fifth rotors of the driven screw in order from the fluid suction unit to the fluid discharge unit. A first groove is installed on the inner circumference of the casing in which the second rotor of the driven screw and the driving screw is located. A second groove is installed on the inner circumference of the casing in which the third rotor of the driven screw and the driving screw is located. A third groove is installed on the inner circumference of the casing in which the fourth rotor of the driven screw and the driving screw is located. A fourth groove is installed on the inner circumference of the casing in which the fifth rotor of the driven screw and the driving screw is located. The dry vacuum pump can improve the efficiency of the pump and enables vacuum in a high level under same power by rotating at high speed. Also, the dry vacuum pump can reduce power consumption. The dry vacuum pump also can prevent condensation in the casing and can minimize inner corrosion of and damage to the screw and the casing when foreign substances flow therein by smoothly moving and removing a condensed object induced by condensation. |
