Rotary vane vacuum pump with gas ballast assembly
OwnerLi Ouyang, Chuanlei Yanginventors
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a rotary vane vacuum pump 300 (300′) comprising a gas ballast assembly 330. The gas ballast assembly 330 comprises a gas ballast passage fluidly connected to a stator chamber 212 of the pump 300, a gas ballast valve 334 configured to selectively open and close the gas ballast passage depending on the relative gas pressure across the valve 334, and a gas ballast buffer chamber 360 fluidly connected to the gas ballast passage upstream of the gas ballast valve 343, which is in selective fluid communication with the exterior of the pump 300 (300′). The present disclosure also provides a related method of communicating ballast gas to a rotary vane vacuum pump 300 (300′).
Claims15
A rotary vane vacuum pump comprising:
- a stator defining a stator chamber therein;
- a rotary vane assembly mounted for rotation eccentrically within the stator chamber;
- a generator casing that encases the stator;
- and
- a gas ballast assembly in fluid communication with the stator chamber for selectively admitting ballast gas from an exterior of the pump into the stator chamber;
- wherein the gas ballast assembly comprises:
- a gas ballast passage fluidly connected to the stator chamber;
- a gas ballast valve configured to selectively open and close the gas ballast passage depending on the relative gas pressure across the valve;
- and
- a gas ballast buffer chamber fluidly connected to the gas ballast passage upstream of the gas ballast valve, and in selective fluid communication with the exterior of the pump.
A method of communicating ballast gas to a rotary vane vacuum pump, the method comprising:
- placing a gas ballast buffer chamber in selective fluid communication with a ballast gas from an exterior of the rotary vane vacuum pump;
- fluidly connecting a gas ballast passage and a gas ballast valve to the gas ballast buffer chamber downstream thereof, wherein the gas ballast valve is configured to selectively open and close the gas ballast passage depending on the relative gas pressure across the valve;
- and
- fluidly connecting the gas ballast passage to a stator chamber of the rotary vane vacuum pump.
Dependencies are inferred from the claim text.