Compressor or turbine type rotary machine for compressing or expanding a dangerous gas
First Claim
1. A rotary machine for treating a gas under pressure, said machine comprising a stator in which an annular gas flow chamber is formed, a rotor mounted to rotate in said chamber, a rotary shaft on which the rotor is fixed and which extends outside the stator through a shaft passage thereof, bearings for guiding and supporting the shaft being mounted in said shaft passage of the stator, a bell mounted in sealed manner on the outside of the stator around said shaft passage and delimiting a closed enclosure filled with liquid and separate from said annular gas flow chamber, means for pressurizing the liquid inside the enclosure to a pressure not lower than a maximum value of the gas pressure in the annular chamber of the stator, said liquid pressurizing means comprising a pressure multiplier whose input is connected via a pressure outlet to the annular gas flow chamber of said stator and whose outlet is connected to the closed liquid filled enclosure delimited by said bell, liquid-tight sealing means disposed in said shaft passage between the rotor shaft and the stator at the annular gas flow chamber end thereof and allowing only a very small leakage flow rate of said pressurized liquid towards the annular chamber while inhibiting the admission of gas from said annular chamber past the sealing means, and link means comprising a rotary magnetic coupling for linking the rotor shaft to a second shaft outside the stator.
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Accused Products
Abstract
A compressor or turbine type rotary machine for compressing or expanding a dangerous gas, e.g. a gas that is toxic or explosive, comprises a closed enclosure formed outside the stator around a shaft passage receiving the shaft of the rotor, the enclosure being delimited by a bell and being filled with a liquid under pressure, a wet type mechanical seal being disposed between the rotor shaft and the stator, inside the stator. The liquid contained in the enclosure is put under pressure, and a magnetic coupling is provided to link the rotor shaft to an outside shaft. The invention makes it possible to prevent any leakage of dangerous gas from the inside to the outside of the rotary machine.
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Citations
13 Claims
- 1. A rotary machine for treating a gas under pressure, said machine comprising a stator in which an annular gas flow chamber is formed, a rotor mounted to rotate in said chamber, a rotary shaft on which the rotor is fixed and which extends outside the stator through a shaft passage thereof, bearings for guiding and supporting the shaft being mounted in said shaft passage of the stator, a bell mounted in sealed manner on the outside of the stator around said shaft passage and delimiting a closed enclosure filled with liquid and separate from said annular gas flow chamber, means for pressurizing the liquid inside the enclosure to a pressure not lower than a maximum value of the gas pressure in the annular chamber of the stator, said liquid pressurizing means comprising a pressure multiplier whose input is connected via a pressure outlet to the annular gas flow chamber of said stator and whose outlet is connected to the closed liquid filled enclosure delimited by said bell, liquid-tight sealing means disposed in said shaft passage between the rotor shaft and the stator at the annular gas flow chamber end thereof and allowing only a very small leakage flow rate of said pressurized liquid towards the annular chamber while inhibiting the admission of gas from said annular chamber past the sealing means, and link means comprising a rotary magnetic coupling for linking the rotor shaft to a second shaft outside the stator.
- 11. A rotary machine for treating a gas under pressure, said machine comprising a stator in which an annular gas flow chamber is formed, a rotor mounted to rotate in said chamber, a rotary shaft extending outside the stator through a shaft passage thereof, bearings for guiding and supporting the shaft in said shaft passage, a bell mounted in sealed manner on the outside of the stator around said shaft passage and delimiting a closed enclosure filled with liquid and separate from said annular gas flow chamber by an intermediate chamber through which the rotor shaft passes, said intermediate chamber being formed between the annular gas flow chamber and the shaft passage and being delimited axially by dry seals carried by the rotor shaft, means provided to bring a barrier gas under relatively high pressure into said intermediate chamber between said dry seals, and to bring a scavenging gas at relatively low pressure into an annular space formed around the rotor shaft between said intermediate chamber and the shaft passage, the machine further comprising means for pressurizing the liquid inside the enclosure to a pressure not lower than a maximum value of the gas pressure in said annular gas flow chamber, liquid-tight sealing means disposed in said shaft passage between the rotor shaft and the stator at the annular space end thereof and allowing only a very small leakage flow rate of said pressurized liquid towards the annular space while inhibiting the admission of gas from said annular space past the liquid-tight sealing means, and link means comprising a rotary magnetic coupling for linking the rotor shaft to a second shaft outside the stator.
Specification