Vacuum jet pump for recovering a mixed fluid of gas and liquid condensates from steam-using apparatus

A condensate recovering vacuum pump comprising:

• a condensate tank for collecting and temporarily holding a condensate, a circulating pump for supplying the collected condensate from the condensate tank to a feedwater nozzle of a jet pump, and a jet pump that creates a negative pressure at a port through which the condensate is taken in by injecting the feedwater, sucking the condensate through a condensate inlet port connected to a steam trap of a steam-using apparatus, and delivering the condensate together with the feedwater through a discharge port into the condensate tank, the condensate inlet port receiving a mixed fluid of gas and liquid containing leaked steam, residual air, and the condensate, wherein the jet pump comprises:
• a vacuum chamber into which the condensate inlet port opens;
• a convergent cylindrical segment opening into the vacuum chamber with a cross-sectional area thereof becoming smaller with a distance therefrom;
• a throat segment concentrieally adjoining the convergent cylindrical segment and having a substantially uniform cross-sectional area;
• and a divergent segment adjoining the throat segment and flaring with a distance therefrom;
• the nozzle having an orifice at a tip thereof that protrudes slightly into the convergent cylindrical segment from a vacuum chamber side, with an inside wall of the tip of the nozzle conically flaring so that an imaginary extension therefrom contacts an internal surface of the throat segment adjacent to a rear end of said throat segment such that feedwater expelled from the feedwater nozzle creates a fluid seal.