Jet vacuum pump working principle and structure

[Asia Fluid Network News] jet vacuum pump is mainly used for pumping out the air without condensable gases and non-corrosive gases, widely used in large pumping speed and high vacuum equipment. For example: vacuum smelting, electricity, transformers, vacuum impregnation, pre-pumping vacuum coating equipment. Its working principle is of great significance to related products. Jet vacuum pump working principle and structure diagram Next mainly introduces the working principle of jet vacuum pump: Jet vacuum pump internal components are Laval nozzle and diffuser composition, single-stage steam jet pump structure as shown, the other levels of structure The form is basically the same. The working process can be divided into three stages: adiabatic expansion stage, mixing stage, compression stage. 1, In the adiabatic expansion stage, after the working steam passes through the scaling nozzle, the pressure can be converted to velocity and enter the diffuser at a very high speed. At the same time, the pressure of the working steam drops at the exit of the nozzle to form a vacuum, 2. In the mixing stage, the evacuated gas enters the diffuser. In the diffuser, the steam collides with the evacuated gas, mixes and exchanges energy, and completes the mixing in the throat of the diffuser. The two gases reach the same speed. 3 In the compression stage, after passing through the throat of the diffuser, the speed of the air-fuel mixture is reduced and the pressure is further increased. At the outlet of the diffuser, the atmospheric pressure or the inlet pressure of the latter stage ejector is exhausted, and the evacuated gas is discharged. Well tolerated changes in temperature, so the pump can be subjected to higher temperatures than the same type of pump but will not affect its service life. The pump is widely used in the electronics industry, such as tubes, tubes, X-ray tubes, and semiconductor monocrystalline silicon smelting purification, distillation of high-boiling oil distillation separation, fluorescent lamps, vacuum flask high vacuum exhaust equipment. Related articles: Turbomolecular pump working principle and structure diagram Traction molecular pump working principle and structure diagram

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