But water ring pump - steam jet pump's of automatic voltage regulation pipe -line system

The utility model relates to a steelmaking vacuum refining technology field provides a but water ring pump - steam jet pump's of automatic voltage regulation pipe -line system, including real empty room and waste gas extraction mechanism, real empty room is provided with the air duct, waste gas extraction mechanism includes first steam pump subassembly and water ring pump subassembly, first steam pump subassembly includes two at least first steam pumps, the water ring pump subassembly includes the water ring pump, and the water ring pump is located between gas vent and the first steam pump subassembly, still include the pressure regulating device, the pressure regulating device includes intake pipe and air -vent valve, the other end and the air duct intercommunication of intake pipe, and the junction is located the air duct between a second first steam pump and the real empty room between air duct and the intake pipe. The utility model discloses pipe -line system is along exhaust flow during to termination of pumping in proper order, and the pressure regulating device can be external gaseous to replenishing in the air duct to make the air duct within the inlet pressure of each pump department is requiring pressure range, and then can avoid the water ring pump to produce great vibration and noise at the termination of pumping in -process.