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ZJ2B Series Roots Water Ring Vacuum Unit


Product Description

Roots vacuum pump is a rotary variable volume vacuum pump. It is evolved from roots blower. It is to use two "8" shaped rotors to make synchronous reverse rotation in the pump housing to complete suction and exhaust. According to the different working range of Roots vacuum pump, it can be divided into low vacuum Roots pump with direct discharge to the atmosphere; Medium vacuum roots pump (also known as mechanical booster pump) and high vacuum multistage roots pump. Generally speaking, Roots pump has the following characteristics: it has a large pumping speed in a wide pressure range; Fast start and can work immediately; Not sensitive to dust and water vapor contained in the extracted gas; The rotor does not need to be lubricated, and there is no oil in the pump cavity; Low vibration, good rotor dynamic balance condition, equipped with exhaust valve; Low driving power and mechanical friction loss; Compact structure and small floor area; Low operation and maintenance costs.

Technical Parameter

Unit Type Pump model Pumping speed  (L/S) Maximum suction pressure (Pa) pressure limit Total Power (kW)
Main Pump prepump water ring oil pump unit
JZJ2B30-2 ZJ30 2BV2061 30 8000

JZJ2B30-1 ZJ30 2BV5110 30 12000

JZJ2B70-2 ZJ70 2BV5110 70 6000

JZJ2B70-1 ZJ70 2BV5111 70 12000

JZJ2B150-2A ZJP150 2BV5111 150 6000

JZJ2B150-2B ZJP150 2BV5121 150 8000

JZJ2B150-1 ZJP150 2BV5131 150 10000

JZJ2B300-2A ZJP300 2BV5131 300 4000

JZJ2B300-2B ZJP300 2BV5161 300 5000 267 80 19
JZJ2B300-1 ZJP300 2BE1 202 300 10000

JZJ2B600-2A ZJP600 2BE1 202 600 4000

JZJ2B600-2B ZJP600 2BE1 203 600 5000

JZJ2B600-1 ZJP600 2BE1 252 600 12000

JZJ2B1200-2A ZJP1200 2BE1 252 1200 2500

JZJ2B1200-2B ZJP1200 2BE1 253 1200 4000

JZJ2B1200-1 ZJP1200 2BE1 303 1200 8000

JZJ2B2500-2 ZJP2500 2BE1 303 2500 3000

JZJ2B70-2.1 ZJ70 ZJ30/2BV5110 70 6000

JZJ2B150-2.1 ZJP150 ZJ70/2BV5111 150 6000 25 0.8 8.8
JZJ2B 150-4.1 ZJP150 ZJ30/2BV5110 150 3000


Unit Type pump model pumping speed (L/S) maximum suction pressure (Pa) pressure limit total power (kW)
main pump prepump water ring unit oil pump unit
JZJ2B300-2.1 ZJP300 ZJP150/2BV5131 300 5000

JZJ2B300-2.2 ZJP300 ZJP150/2BV5121 300 4000

JZJ2B300-4.1 ZJP300 ZJ70/2BV5111 300 2000

JZJ2B600-4.1 ZJP600 ZJP150/2BV5131 600 1500

JZJ2B600-2.2 ZJP600 ZJP300/2BV5161 600 2000 25 0.8 24.5
JZJ2B1200-4.2 ZJP1200 ZJP300/2BV5161 1200 1000 30
JZJ2B1200-4.1 ZJP1200 ZJP1200/2BE1 202 1200 1200

JZJ2B 1200-2.2 ZJP1200 ZJP600/2BE1 203 1200 2500

JZJ2B1200-2.1 ZJP1200 ZJP600/2BE1 252 1200 3000

JZJ2B2500-4.1 ZJP2500 ZJP600/2BE1 252 2500 1000

JZJ2B70-2.1.1 ZJ70 ZJ30/ZJ30/2BV5110 70 6000

JZJ2B150-2.2.1 ZJP150 ZJ70/ZJ30/2BV5110 150 3000

JZJ2B300-2.2.1 ZJP300 ZJ150/ZJ70/2BV5111 300 3000

JZJ2B300-4.2.1 ZJP300 ZJ70/ZJ30/2BV5110 300 1200 0.5 0.05 9.85
JZJ2B600-2.2.1 ZJP600 ZJP300/ZJP150/2BV5131 600 2500 22.7
JZJ2B600-4.2.1 ZJP600 ZJP150/ZJ70/2BV5111 600 1200

JZJ2B1200-4.2.1 ZJP1200 ZJP300/ZJP150/2BV5131 1200 1000

JZJ2B2500-4.2.1 ZJ2500 ZJP600/ZJP300/2BE1 202 2500 1000


Application Area

Widely used in vacuum metallurgy, as well as in the chemical, food, and pharmaceutical industries for vacuum distillation, vacuum concentration, and In terms of vacuum drying and other aspects, improvements are made to make it more suitable for cooperating with a water ring vacuum pump to remove a large amount of water vapor

Gas and solvents, etc.


Main features

◆In a wide pressure range (1-1 × 10 5Pa) has a large pumping speed.

◆ There is no oil in the pump chamber, which prevents oil vapor from polluting the vacuum system. 

◆The mechanical friction loss is small, so the drive power is small. 

◆Easy to maintain and repair, low cost and long service life. The condensable gas can be removed. 

◆ It cannot be used alone, and the front pump must be equipped. It is not allowed to start under atmospheric pressure. It can only be started when the inlet pressure of the Roots pump is pumped to the allowable inlet pressure by the previous stage pump. The front stage pump generally adopts liquid ring pump or oil seal mechanical pump.

◆In view of the characteristics of extracting water vapor and organic solvent, improvements have been made to solve the problem of emulsification of bearing cavity oil.

Working Principle


The structure of roots pump is shown in the figure. In the pump cavity, there are two "8" shaped rotors installed on a pair of parallel shafts vertically, driven by a pair of gears with a transmission ratio of 1, which rotate synchronously in opposite directions to each other. There is a certain clearance between the rotors and between the rotor and the inner wall of the pump casing, which can realize the high-speed operation. As Roots pump is a vacuum pump without internal compression, the compression ratio is usually very low, so the front stage pump is required. The ultimate vacuum of Roots pump depends not only on the structure and manufacturing accuracy oThe working principle of roots pump is similar to that of roots blower. Due to the continuous rotation of the rotor, the extracted gas is sucked into the space V0 between the rotor and the pump housing from the suction port, and then discharged through the exhaust port. Since the V0 space is completely closed after suction, the gas in the pump cavity is not compressed and expanded. However, when the top of the rotor turns over the edge of the exhaust port and the V0 space is connected with the exhaust side, due to the high gas pressure at the exhaust side, a part of the gas rushes back into the V0 space, making the gas pressure suddenly increase. When the rotor continues to rotate, the gas is discharged from the pump.f the pump itself, but also on the ultimate vacuum of the previous pump. In order to improve the ultimate vacuum of the pump, the Roots pump can be used in series.

Shandong Kaien Vacuum Technology Co., Ltd.

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    Company headquarters2603-B, Building B1C, Qilu Gate, Greenland, Huaiyin District, Jinan City, Shandong Province
    Company production plant : No. 11111, Second Ring South Road, Jinan City, Shandong Province
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