Water jet pump has a certain pressure of the working medium water through the nozzle to the suction chamber high-speed jet, the water pressure can be kinetic energy, the formation of high-speed jet; inhalation chamber gas is forced to carry high-speed jet mixed with the formation of gas and liquid Mixed flow, into the diffuser, so that the suction chamber pressure is reduced to form a vacuum expansion phase in the diffuser, mixed jet kinetic energy into pressure energy, the speed decreases the pressure rise, the gas is further compressed, together with the water Exhaust pump, water and gas separation in the water tank, the gas released into the atmosphere, water recycling by the pump, to achieve the purpose of pumping around again and again. The nozzle of a single-stage water jet pump may be a single nozzle structure formed by a tapered nozzle or a multi-nozzle structure having a plurality of orifices on one orifice plate. Operating characteristics: water jet pump system consists of water pumps, water jet pumps, piping, valves, water vapor separator and test instrumentation and other components, commonly used systems are vertical and horizontal two installation. Domestic water jet pump exhaust volume of 5 ~ 800 m3 / h, single-stage pump ultimate vacuum up to 3 000 Pa (23 Torr) or so. Figure 7 shows the suction curve of ZSWJ water jet pump produced by Shanghai Hokaoka Vacuum Equipment Co., Ltd. The pumping capacity is 50 m3 / h, 100 m3 / h, 110 m3 / h and 130 m3 / h, respectively. In order to increase the degree of vacuum, can run in series with steam, if the use of a water jet pump with a three-stage steam jet pump to form a four-stage steam jet pump unit, the ultimate pressure of up to 20 Pa (0.15 mmHg). In order to prevent being pumped medium vacuum pump, optional anti-corrosion jet pump. Centrifugal pump can be made of reinforced polypropylene (RPP), stainless steel, fluorine alloy, glass fiber reinforced plastic; Jet pump can be made of stainless steel, cast iron inner roll of polyethylene (PE) or polychlorotrifluoroethylene steel lining ceramic nozzle Teflon Or ceramic.
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