초록 ▼

A rotary vane pump has restricted fluid communication between the inlet and the trapped volume for about 4°of rotation beyond when the vane starts past the inlet. Similarly there is restricted communication between the trapped volume and the outlet for about 4°of rotation prior to the vane reaching

A rotary vane pump has restricted fluid communication between the inlet and the trapped volume for about 4°of rotation beyond when the vane starts past the inlet. Similarly there is restricted communication between the trapped volume and the outlet for about 4°of rotation prior to the vane reaching the outlet. Additionally, in the preferred embodiment, the trapped volume is in restricted communication with the outlet prior to its isolation from the inlet.

대표청구항 ▼

A method of operating a rotary vane device having a single inlet and a single outlet at a reduced noise level wherein a rotor rotates within a chamber and carries a plurality of spaced vanes sequentially sweeping past the inlet and outlet with adjacent vanes together with the wall of the chamber def

A method of operating a rotary vane device having a single inlet and a single outlet at a reduced noise level wherein a rotor rotates within a chamber and carries a plurality of spaced vanes sequentially sweeping past the inlet and outlet with adjacent vanes together with the wall of the chamber defining a trapped volume which is delivered to the outlet including the step of: continuing and smoothly transitioning to zero the communication between the inlet and the trapped volume over approximately 4°of rotation of the rotor beyond when the vanes start to move past the inlet by use of a beveled chamfer whereby pressure pulsations and their resultant noise are reduced.