Rotary vane oil pump and method of operating
AssigneeCarrier Corporation
InventorsMax P. Waser, Thomas M. Zinsmeyer
Life of this patent
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Abstract
A rotary vane pump has restricted fluid communication between the inlet and the trapped volume for about 4.degree. 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.degree. 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.
Claims10
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.degree. 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.
A method of operating a rotary vane device having a single inlet and single outlet 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 steps of:
- continuing and smoothly transitioning to zero the communication between the inlet and the trapped volume beyond when the vanes start to move past the inlet by use of a beveled chamfer;
- and
- establishing communication between the trapped volume and the outlet during the period of continuing communication between the inlet and the trapped volume whereby pressure pulsations and their resultant noise are reduced.
A rotary vane device including a housing having a generally cylindrical chamber with a single inlet and a single outlet in fluid communication therewith, a rotor having a plurality of spaced vanes and rotatable within said cylindrical chamber such that said vanes sequentially sweep past said inlet and said outlet with adjacent vanes together with said rotor and said cylindrical chamber defining a trapped volume which is delivered to said outlet, the improvement comprising:
- first restricted fluid path defining means including a beveled chamfer between said inlet and said cylindrical chamber for providing continued, restricted fluid communication between said inlet and said trapped volume beyond a point where the vane defining the downstream end of said trapped volume starts to sweep past said inlet and which smoothly transitions to zero to thereby reduce pressure pulsations and their resultant noise.
Dependencies are inferred from the claim text.