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Ejector is the generic name of a jet appliance capable of aspirating different products: gases, liquids and solids (powders, granulates or sludge) and takes different names according to its functions: jet vacuum pump, thermocompressor, gas scrubber, eductor, etc. The operating theory is the same for every type of ejector.
| Jet vacuum pump (our main application for the ejector) Static operating apparatus capable of obtaining a vacuum within a capacity. The vacuum corresponds to the suction pressure of the steam or gas needed by process requirements. The suction pressure is obtained by means of thermodynamic and fluid mechanics laws: A high energy potential motive fluid is relieved through a converging and diverging nozzle and accelerated to velocities that are often supersonic. At the outlet of the nozzle, the potential energy of the motive fluid is transformed into kinetic energy. | 
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At the inlet of the diffuser, the motive fluid gives off part of its kinetic energy to the aspirated fluid so that the mixture of the two fluids goes through inverse transformation in which the velocity is converted into pressure at the diffuser discharge. Diagram jet vacuum pump | |
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1. Motive fluid inlet 2. Vacuum - suction 3. Nozzle 4. Diffuser 4.1. Converging mixing cone 4.2. Diffuser neck 5. Discharge |
To summarize, this apparatus is capable of compressing gases and fluids (optimum compression ratio: 7 to 8 = ratio between discharge pressure and suction pressure) so as to obtain constant suction pressure (more or less intense vacuum, depending on process requirements). |
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