Overview

The JZJ2B series Roots liquid ring vacuum unit is a pumping unit consisting of a ZJ-type Roots pump as the main pump and a 2BV series water ring pump or a Roots water ring unit as the backing pump. Besides pumping general gases, it can also pump gases containing moisture, organic solvents, or small amounts of dust. Compared to general mechanical vacuum pumps, it is unaffected by oil contamination, water vapor, and dust. Compared to general water ring vacuum pumps, it features higher vacuum levels and higher pumping speeds under vacuum conditions.

The JZJ2B series Roots liquid ring vacuum unit uses the efficient and energy-saving 2BV series water ring pump as the backing pump. Therefore, compared to the JZJ2S series, the JZJ2B series vacuum unit has advantages such as higher efficiency, more compact structure, leak-free operation (the 2BV pump uses a mechanical seal design, unlike the packing seal of the 2SK series), corrosion resistance (the 2BV uses a stainless steel or aluminum bronze impeller), and a higher protection level.

The Roots vacuum pump uses our company's independently developed ZJ series Roots vacuum pump. Our company has improved the sealing between the pump chamber and bearing chamber in the ZJ series Roots vacuum pump, making the pump oil less prone to emulsification in processes involving the removal of large amounts of water vapor and various solvents.

The working fluid of the backing pump in the Roots liquid ring vacuum unit is mostly water, but organic solvents (methanol, ethanol, xylene, acetone, etc.) or other liquids can also be used. Using the backing pump as a closed-loop circulation system greatly reduces environmental pollution and significantly improves the recovery of organic solvents. Its ultimate vacuum level is determined by the saturated vapor pressure of the working fluid.

Model Description

Unit Selection Considerations

① Understand the composition of the gas being pumped, including whether it contains condensable vapors, particulate matter, or corrosive substances. When selecting a vacuum pump, the gas composition must be known to choose an appropriate pump. If the gas contains vapors, particles, or corrosive gases, auxiliary equipment such as a condenser or dust collector should be considered for installation on the pump's inlet line.

② The operating pressure of the Roots vacuum unit should meet the ultimate vacuum and operating pressure requirements of the vacuum equipment. For example, if a vacuum drying process requires an operating pressure of 10 mmHg (absolute pressure), the ultimate pressure of the selected vacuum pump should be at least 2 mmHg, and preferably lower than 1 mmHg. Generally, the ultimate pressure of the selected pump should be half to one order of magnitude higher than the operating pressure of the vacuum equipment.

③ Correctly select the operating point of the Roots vacuum unit. The normal operating range is the maximum suction pressure ~ ultimate pressure x 5. Example: JZJ2B150-70-5111, the normal operating pressure range of the Roots liquid ring vacuum unit; this unit is more efficient within this range.

④ The vacuum unit should be able to remove all the gas generated during the vacuum equipment process at its operating pressure.

Performance Parameter Table

Product Model	Pumping rate (L/s)	Ultimate pressure (≤Pa)	Pump Model
Product Model	Pumping rate (L/s)	Ultimate pressure (≤Pa)	main pump	Ultimate pressure (≤Pa)	Rotational speed (r/min)	intermediate pump	Power (kW)	Rotational speed (r/min)	Backing pump	Power (kW)	Rotational speed (r/min)
JZJ2B30-5(6)110	30	150	ZJC30	1.1	2900				2BV-5(6)110	4	1450
JZJ2B70-5(6)110	70	150	ZJC70	2.2	2900				2BV-5(6)110	4	1450
JZJ2B70-5(6)111	70	150	ZJC70	2.2	2900				2BV-5(6)111	5.5	1450
JZJ2B150-5(6)111	150	150	ZJC150	3	2900				2BV-5(6)111	5.5	1450
JZJ2B150-5(6)121	150	150	ZJC150	3	2900				2BV-5(6)121	7.5	1450
JZJ2B150-5(6)131	150	150	ZJC150	3	2900				2BV-5(6)131	11	1450
JZJ2B300-5(6)131	300	150	ZJP300	4	2900				2BV-5(6)131	11	1450
JZJ2B300-5(6)161	300	150	ZJP300	4	2900				2BV-5(6)161	15	960
JZJ2B70-30-5(6)110	70	25	ZJC70	2.2	2900	ZJC30	1.1	1450	2BV-5(6)110	4	1450
JZJ2B150-70-5(6)111	150	25	ZJC150	3	2900	ZJC70	2.2	1450	2BV-5(6)111	5.5	1450
JZJ2B300-150-5(6)121	300	25	ZJP300	4	2900	ZJC150	3	2900	2BV-5(6)121	7.5	1450
JZJ2B300-150-5(6)131	300	25	ZJP300	4	2900	ZJC150	3	2900	2BV-5(6)131	11	1450
JZJ2B600-300-5(6)161	600	25	ZJP600	7.5	2900	ZJP300	4	2900	2BV-5(6)161	15	960
JZJ2B70-30-30-5(6)110	70	1	ZJC70	2.2	2900	ZJC30	1.1	1450	2BV-5(6)110	4	1450
JZJ2B70-30-30-5(6)110	70	1	ZJC70	2.2	2900	ZJC30	1.1	1450	2BV-5(6)110	4	1450
JZJ2B150-70-30-5(6)110	150	1	ZJC150	3	2900	ZJC70	2.2	1450	2BV-5(6)110	4	1450
JZJ2B150-70-30-5(6)110	150	1	ZJC150	3	2900	ZJC30	1.1	1450	2BV-5(6)110	4	1450
JZJ2B300-150-70-5(6)111	300	1	ZJP300	4	2900	ZJC150	3	2900	2BV-5(6)111	5.5	1450
JZJ2B300-150-70-5(6)111	300	1	ZJP300	4	2900	ZJC70	2.2	1450	2BV-5(6)111	5.5	1450
JZJ2B600-300-150-5(6)131	600	1	ZJP600	7.5	2900	ZJP300	4	2900	2BV-5(6)131	11	1450
JZJ2B600-300-150-5(6)131	600	1	ZJP600	7.5	2900	ZJC150	3	2900	2BV-5(6)131	11	1450

Note: 1. The above table is a recommended standard series. Due to different working conditions in actual production applications, the intake gas and pressure will vary greatly. Therefore, when selecting a model, the actual gas extraction process, gas release process, condensation of condensable gases, and time changes in intake pressure should be checked and calculated, or the model should be selected with reference to the existing equipment usage.

2. For detailed technical specifications of a single pump, please refer to the parameter table for each pump.

JZJ2B Series Roots Liquid Ring Complete Vacuum Unit

Description

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