The units are applied to exhausting normal gases and gases with water, organic solvents or a little dust.
Overview: Each roots water ring pump unit of JZJ series is an exhauster unit comprising a JZ roots water ring pump as main pump and a 2BV water ring pump/2BE1 water ring pump/SK water ring pump or roots-water ring pump unit as a backing pump. The units are applied to exhausting normal gases and gases with water, organic solvents or a little dust. Compared with normal mechanical vacuum pumps, the units resist oil, steam and dust. Compared with normal water ring vacuum pumps, they have high vacuums and high exhaust speeds under high vacuum. The backing pumps for the roots water ring pump units usually use water as the operating fluid as well as organic solvents (methanol, ethanol, xylene, acetone, etc.) or other liquids. The backing pumps are closed circulatory systems, remarkably reducing environmental pollution and increasing recycle rate of organic solvent. The limiting vacuum is determined by saturated vapor pressure of the operating liquid.Model expression: Common ratios of JZJ roots-water ring vacuum pump units:
Package unit model | Pump model | Suction rate(L/s) | Limited vacuum (Pa) |
Main pump | Backing pump(/means or) |
JZJ2BV/2SK 70-1 | ZJ(P)70 | 2BV110/2SK-3 | 70 | First grade roots unit 267 |
JZJ2BV/2SK 150-2 | ZJ(P)150 | 2BV111/2BV121/2SK-3 | 150 |
JZJ2BV/2SK 150-1 | ZJ(P)150 | 2BV131/2SK-6 | 150 |
JZJ2BV/2SK 300-2 | ZJ(P)300 | 2BV131/2BV161/2SK6 | 300 |
JZJ2BE/2SK 300-1 | ZJ(P)300 | 2BE1-202/2SK-12 | 300 |
JZJ2BE/2SK 600-2 | ZJ(P)600 | 2BE1-202/2BE1-203 /2SK-12/2SK-20 | 600 |
JZJ2BE 600-1 | ZJ(P)600 | 2BE1-252/2BE1-253 | 600 |
JZJ2BE 1200-2 | ZJ(P)1200 | 2BE1-252/2BE1-253 | 1200 |
JZJ2BE 1200-1 | ZJ(P)1200 | 2BE1-303 | 1200 |
JZJ2BV/2SK70-2.1 | ZJ(P)70 | ZJ(P)30+2BV110/2SK-3 | 70 | Second grade roots unit 67 |
JZJ2B150-2.1 | ZJ(P)150 | ZJ(P)70+2BV111 | 150 |
JZJ2B150-4.1 | ZJ(P)150 | ZJ(P)30+2BV110 | 150 |
JZJ2BV/2SK 300-2.1 | ZJ(P)300 | ZJ(P)150+2BV131/2SK-6 | 300 |
JZJ2B300-2.2 | ZJ(P)300 | ZJ(P)150+2BV121 | 300 |
JZJ2B300-4.1 | ZJ(P)300 | ZJ(P)70+2BV111 | 300 |
JZJ2B 600-4.1 | ZJ(P)600 | ZJ(P)150+2BV131 | 600 |
JZJ2BV 600-2.2 | ZJ(P)600 | ZJ(P)300+2BV161/ 2BE-202 | 600 |
JZJ2BV 1200-4.2 | ZJ(P)1200 | ZJ(P)300+2BV161 | 1200 |
JZJ2BE/2SK 1200-4.1 | ZJ(P)1200 | ZJ(P)300+2BE-202/ 2SK-12 | 1200 |
JZJ2BE 1200-2.2 | ZJ(P)1200 | ZJ(P)600+2BE1-203 | 1200 |
JZJ2BE1 200-2.1 | ZJ(P)1200 | ZJ(P)600+2BE1-252 | 1200 |
JZJ2BV 150-2.2.1 | ZJ(P)150 | ZJ70+ZJ30+2BV110 | 150 | Third grade roots unit 0.5 |
JZJ2BV 300-2.2.1 | ZJ(P)300 | ZJ150+ZJ70+2BV111 | 300 |
JZJ2BV/2SK 300-4.2.1 | ZJ(P)300 | ZJ70+ZJ30+2BV110/2SK1.5 | 300 |
JZJ2BV 600-2.2.1 | ZJ(P)600 | ZJ300+ZJ150+2BV131 | 600 |
JZJ2BV/2SK 600-4.2.1 | ZJ(P)600 | ZJ150+ZJ70+2BV111/2SK3 | 600 |
JZJ2BV /2SK 1200-4.2.1 | ZJ(P)1200 | ZJ300+ZJ150+2BV131/2SK6 | 1200 |
JZJ2BE/2SK 1200-2.2.1 | ZJ(P)1200 | ZJ600+ZJ300+2BE1-202/2SK-12 | 1200 |
Note:1. Values described above are common pump ratios. The limiting vacuums and exhaust speeds are ideal values under standard condition. Actual performances of the unit are determined by working condition. 2. The limiting vacuum of the unit can be increased to a certain degree when the circulating liquid of the water ring pump is oil or other liquids with low saturated vapor pressures. 3. The roots pump will heat and the limiting vacuum will fall when performance differences between the main pump and backing pump are over large. Such problem deserves special attention as it affects stable operation of the unit. For better reliability of the unit, we suggest larger ratio for the backing pump as long as overall power is maintained. 4. When the roots pump is combined with a water ring pump, water in the water ring pump may flow into the roots pump when the unit stops, resulted in emulsification of oil in gear box of the roots pump after a certain period. Our company equips a liquid stopper at inlet of the water ring pump and an air pocket between the water ring pump and roots pump so as to prevent the backflow, thus the unit is more reliable.
Roots-water ring pump package unit
