Cylinder structure for rotary vane type vacuum pump

Abstract

The present invention relates to a cylinder structure for a rotary vane type vacuum pump which is capable of preventing a high pressure gas in a discharging port from flowing beyond vanes in the direction of a suction portion for thereby implementing a high vacuum state, decreasing a time required for obtaining a high vacuum state, and decreasing a noise. In a cylinder structure of a rotary vane type vacuum pump, a vane formed of a single plate shaped member and having a certain length is inserted into a vane engaging hole formed in the rotor, an inner diameter of the cylinder is processed to have the same diameter as the diameter of the pumping hole which passes through the center of the rotor, and both ends of the vane closely contacts with the pump hole when the vane is rotated in the pumping hole based on the rotation of the rotor in a rotary vane type vacuum pump which includes a suction port for sucking a gas from a vacuum facility into a pumping hole, a cylinder having a discharging port for discharging the gas from the pumping hole to the outside, and a rotor which is rotated in the pumping hole of the cylinder and is installed therein an eccentric method and includes a rotating vane which is closely contacted with the inner wall of the cylinder,

What is claimed is:  
     
         1 . In a rotary vane type vacuum pump which includes a suction port for sucking a gas from a vacuum facility into a pumping hole, a cylinder having a discharging port for discharging the gas from the pumping hole to the outside, and a rotor which is rotated in the pumping hole of the cylinder and is installed therein an eccentric method and includes a rotating vane which is closely contacted with the inner wall of the cylinder, a cylinder structure of a rotary vane type vacuum pump in which a vane formed of a single plate shaped member and having a certain length is inserted into a vane engaging hole formed in the rotor, an inner diameter of the cylinder is processed to have the same diameter as the diameter of the pumping hole which passes through the center of the rotor, and both ends of the vane closely contacts with the pump hole when the vane is rotated in the pumping hole based on the rotation of the rotor.  
     
     
         2 . The structure of  claim 1 , wherein a streamline shaped curved portion is formed at both ends of the vane for thereby implementing a closer contact with an inner surface of the cylinder.