JZJ2B series Roots water ring unit is composed of ZJ Roots pump as the main pump, 2BV series water ring vacuum pump or roots vacuum pump water ring unit as the front pump. It can be used to extract not only general gas, but also 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.
Roots pump water ring vacuum pump 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 vacuum 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 water ring vacuum pump is designed as mechanical seal, different from the packing seal of 2SK Series), corrosion resistance (2BV uses aluminum bronze impeller), high protection level and so on compared with jzj2s series.
When the working fluid in the front pump is changed to oil, the limiting vacuum degree of Roots vacuum unit can be effectively improved. Roots oil ring unit is a closed-circuit circulation 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.
roots water ring vacuum unit selection:
In general, water ring vacuum pump is more advantageous than other vacuum pumps in Roots vacuum unit, because it can pump out a lot 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 when the vacuum system does not allow oil pollution For obvious. In the selection of vacuum units, it is generally required that the limit 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 achieve the best use requirements, that is, the working pressure ⌈ limit pressure (5-10) is appropriate.
There are several types of roots water ring vacuum units as follows:
Roots vacuum pump + water ring vacuum pump: the function of water ring vacuum pump in the unit is to create the preparatory vacuum required by roots vacuum pump.
Roots vacuum pump + roots vacuum pump + water ring vacuum pump: the limit vacuum degree of a Roots vacuum pump is relatively low, especially when it is combined with water ring vacuum pump, the range of use is limited, and the limit vacuum degree of the whole unit may be lower, but if two roots vacuum pumps are connected in series and combined with water ring vacuum pump, the limit vacuum degree of the unit can be greatly improved.
Roots vacuum pump + roots vacuum pump + roots vacuum pump + water ring vacuum pump: if two roots vacuum pumps + water ring vacuum pumps can not meet the vacuum degree requirements, one level roots vacuum pump can be added. This kind of roots water ring vacuum unit has been widely used in vacuum freeze-drying and other high vacuum processes.