If the design, manufacture or material is not appropriate, caused by the sliding of the rotor blade, or due to the existence of exhaust dead space, incompressible oil caused by the head of the rotor blade can not always close to the cylinder wall operation, will cause the rotor blade on the cylinder wall of the impact of the sound. Therefore, it is preferable to use the structure of a garden arc to separate the intake and exhaust ports. Eliminate the dead space with the exhaust guide groove. In the use of line separation structure, should try to shorten the distance from the exhaust end point to the cut point, for 70l/s rotary vane pump, considering the actual thickness of the rotary vane, it is recommended to take 7 ~ lomm, large pumps to take a large value. Too close, due to the rotor

　　Too close, due to the existence of the rotor vane groove and the head of the rotor vane only a narrow band contact, the rotor vane turned to the cut point position when the sealing effect is not good, it will affect the pumping speed and even the ultimate pressure. It can be seen that this structure can not completely eliminate the exhaust dead space, limiting the level of noise reduction.

Rotor, cylinder wall impact sound.