When the vacuum unit is used, it can be used to pump not only the general gas, but also the gas containing moisture, organic solvent or a small amount of dust. Compared with the general mechanical vacuum pump, it is not afraid of oil pollution, water gas and dust. Compared with the general water ring vacuum pump, it has the characteristics of high vacuum degree and high pumping speed under high vacuum degree.
Vacuum unit is widely used in chemical, electronic, mechanical, pharmaceutical, food sublimation drying, high altitude simulation test and other vacuum systems. Because the 2BV series water ring pump with high efficiency and energy saving is used as the front stage pump, jzj2b series vacuum unit has the advantages of high efficiency, compact structure, no leakage (2BV pump is designed as mechanical seal, different from the packing seal of 2SK Series), corrosion resistance (2BV uses aluminum bronze impeller), and high protection level compared with jzj2s series.
When the working fluid in the front pump of the vacuum unit is changed to oil, the limiting vacuum degree of the roots vacuum unit can be effectively improved (see the parameter table). The roots oil ring unit is a closed-circuit circulating system, which can reduce pollution and save water. Roots oil ring vacuum unit is widely used in vacuum impregnation, vacuum drying, vacuum degassing and other processes.
The working liquid of the pre-stage pump can also be organic solvent (methanol, ethanol, xylene, aniline, acetone and other organic solvents with low viscosity can be used) or other liquids. The pre-stage pump can be used as a closed-circuit circulation system, which greatly reduces the environmental pollution and greatly improves the recovery of organic solvent. The limiting vacuum is determined by the saturated vapor pressure of the working fluid.
Water ring pump is more advantageous than other vacuum pumps in vacuum unit, because it can pump out a large number of condensable steam, especially when the ability of removing condensable steam is not enough, or the solvent used can make the pump oil deteriorate and affect the performance, or the vacuum system does not allow oil pollution. In the selection of vacuum units, it is generally required that the limiting vacuum degree of the vacuum units should be half to more than one order of magnitude higher than the working vacuum degree in order to meet the use requirements, that is, the working pressure should be ≥ the limiting pressure × (5-10).
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