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Jet pump is also called water ejector. Basically consists of the following structure: Nozzle, suction chamber, mixing tube, diffuser tube. As shown in the picture: When the high-pressure water flow is ejected from the nozzle at high speed with the flow rate Q1, it continuously takes away the air in the suction chamber, creating varying degrees of vacuum in the suction chamber. The pumped liquid acts under atmospheric pressure and enters the suction chamber through the pipe 5 with the flow rate Q2. The two liquids (Q1+Q2) carry out energy transfer and exchange in the mixing tube 3, which makes the flow rate and pressure level. Then, after part of the kinetic energy of the diffuser tube 4 is converted into pressure energy, it is transported out of the pipe 6 at a certain flow rate. Jet pump is also called water ejector. Basically consists of the following structure: Nozzle, suction chamber, mixing tube, diffuser tube. As shown in the picture: 1. Working Principle When the high-pressure water flow is ejected from the nozzle at high speed with the flow rate Q1, it continuously takes away the air in the suction chamber, creating varying degrees of vacuum in the suction chamber. The pumped liquid acts under atmospheric pressure and enters the suction chamber through the pipe 5 with the flow rate Q2. The two liquids (Q1+Q2) carry out energy transfer and exchange in the mixing tube 3, so that the flow rate and pressure tend to level. Then, after part of the kinetic energy of the diffuser tube 4 is converted into pressure energy, it is transported out of the pipe 6 at a certain flow rate. The structure and working principle of the jet pump H₁ - the working liquid in front of the nozzle has a specific energy (mH₂O); H₂ - the liquid at the outlet of the jet pump has a specific energy, which is the head of the jet pump (mH₂O) ； Q₁——Flow rate of working liquid (m3/s) Q₂——Flow rate of pumped body (m3/s) F₁——Nozzle interruption area (m3) F₂——Mixing cross-sectional area (m3) 2. Application of water jet pump The advantages of water jet pump are:: 1. Simple structure, small size, light weight and cheap price ； 2. Convenient for on-site processing and easy installation. WeChat is simple ； 3. There are no moving parts and it is easy to open and close. When the suction port is completely exposed to the water, there is no danger when the flow is cut off. ； 4. Can pump up sludge or other liquids containing particles ； 5. It can be used in series with a centrifugal pump to draw water from large wells or deep wells. The disadvantage is low efficiency. Generally used in water supply and drainage projects: 1. It is used as an air pumping and water diversion device for a centrifugal pump. A jet pump is connected to the top of the centrifugal pump casing. Before the water pump starts, high-pressure water from an external water pipe can be used to suck the air in the pump through the jet pump to achieve the purpose of pumping air and water before the centrifugal pump starts. 2. Jet pumps are used to pump liquid chlorine and alum liquid in water plants, commonly known as "water rats". 3. In the oxygenation process of groundwater iron removal and aeration, the jet pump is used as an air-carrying and aeration device. The jet pump always sucks air, and mixes water vapor through the mixing tube to achieve oxygenation. This kind of water and air jet pump is generally called an air filling valve. 4. In drainage projects, it is used as a pump for stirring and mixing sludge in the sludge digestion tank. In recent years, the use of jet pumps as aeration equipment for biological treatment and aerated water equipment for float purification methods has developed extremely rapidly. 5. Work together with the centrifugal pump to increase the water suction height of the centrifugal pump device. A jet pump is installed at the end of the suction pipe of the centrifugal pump, and the pressure water squeezed out by the centrifugal pump is used as the working liquid. This allows the centrifugal pump to lift liquid from well water up to 30~40m deep. At present, this kind of joint working device is common. It is suitable for areas with deep underground water levels or pastoral areas to solve people's domestic water, livestock water and small area farmland irrigation water. 6. In earthwork construction, it is used as well points to reduce the groundwater level of foundation pits, etc.