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Phone: 400-6064-114

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Address: No. 98, Lane 1233, Lucai North Road, Huaxin Town, Qingpu District, Shanghai

JZJWLW Roots reciprocating vacuum pump unit
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  • JZJWLW型罗茨往复真空泵机组 Product name: JZJWLW Roots reciprocating vacuum pump unit
  • 400-6064-114 Order hotline: 400-6064-114

Product introduction Product introduction
National free consultation hotline: 400-6064-114

The JZJWLW type Roots reciprocating vacuum pump unit is based on the ZJ series Roots vacuum pump as the main pump, and the WLW vertical oil - free reciprocating vacuum pump as the foreline pump. It overcomes the shortcomings of high limit pressure of WLW vacuum pump and low pumping rate under constant pressure, while retaining the advantages of ZJ series roots vacuum pump working quickly and having a large pumping rate. Therefore, the JZJW series Roots oil-free reciprocating vacuum unit is widely used in vacuum distillation, vacuum evaporation, dehydration crystallization in the chemical industry; freeze drying in the food industry, and vacuum drying in the pharmaceutical industry.

Because the WLW type vacuum pump uses oil-free self-lubricating materials to obtain a clean vacuum, the JZJW series Roots oil-free reciprocating vacuum unit is equipped with an exhaust gas collection device at the exhaust port, which can be collected in a high-vacuum system that cannot be solidified or compressed. Gases, such as pentadiene, benzene, and toluene, avoid pollution to the environment due to its low boiling point and difficult collection.

JZJWLW Roots reciprocating vacuum pump unit is a new product developed jointly by our factory and national scientific research units. It has the advantages of significant energy saving, small footprint, water saving and low noise. It is an ideal new product for environmental protection.
1. High ultimate vacuum, long-term stability.
2. The pumping rate is high under higher vacuum conditions.
3. The motor has low power and low energy consumption.
4. Due to the oil-free lubrication of the over-flow part of the JZJW series Roots oil-free reciprocating vacuum unit, after the exhaust gas collection device is installed at the exhaust port of the unit, it can collect gases that cannot be solidified and cannot be compressed in a high vacuum system, such as benzene and toluene.
5. No secondary water pollution, reducing the pressure of pollution control.

Pumping rate: 30 ~ 1200L / S (liters / second)
Ultimate pressure: 1-133Pa (Pa)
Ultimate vacuum: ≤1a (Pa)
Gas type: Clean air without other mixtures at room temperature. Air containing other dust and moisture is not allowed.
Working requirements: Continuous working time when the inlet pressure is greater than 6500Pa, allowing continuous working for a long period of time.
Ambient temperature: The vacuum pump is generally used in an environment of room temperature not lower than 5 ° C and relative temperature not higher than 600%.

JZJWLW Roots reciprocating vacuum pump unit , the new trend of the new century vacuum industry, is designed and manufactured for our factory and customers to jointly pursue environmental protection, high efficiency and recyclability.


1. High vacuum of more than 150Pa can be obtained, and under high vacuum state, the decrease of pumping speed is small.
2. With oil-free self-lubrication as the material, a clean vacuum can be obtained; therefore, it is widely used in food and pharmaceutical vacuum systems.
3. An exhaust gas collection device can be installed at the exhaust port and collected in a high-vacuum system. Gases that cannot be condensed but have no suspicion of compression; such as cyclopentadiene, benzene, toluene, alcohols and other low boiling points are difficult to collect and are often misplaced Cause ring pollution.
4. It has the advantages of energy saving, low noise and low repair.

Item / Model
Name / Model
Pumping rate
(L / S)
Ultimate pressure
(≤ # Pa)
Unit composition model
Construction of Pump System
Total power
Inlet diameter
Exhaust caliber
Main pump
Main pump
Intermediate pump
Foreline pump
Backing Pump
JZJWLW150.50 150 ≤300 ZJ-150 WLW-50 7 DN100 G2.5 ″
JZJWLW150.100 150 ≤300 ZJ-150 WLW-100 10.5 DN100 DN100
JZJWLW300.100 300 ≤300 ZJ-300 WLW-100 11.5 DN150 DN100
JZJWLW600.200 600 ≤300 ZJ-600 WLW-200 20.5 DN200 DN125
JZJWLW150.70.50 150 ≤20 ZJ-150 ZJ-70 WLW-50 8.5 DN100 G2.5 ″
JZJWLW150.150.100 150 ≤20 ZJ-150 ZJ-70 WLW-100 12 DN100 DN100
JZJWLW300.150.100 300 ≤20 ZJ-300 ZJ-150 WLW-100 14.5 DN150 DN100
JZJWLW300.300.100 300 ≤20 ZJ-300 ZJ-300 WLW-100 twenty three DN150 DN125
JZJWLW600.300.100 600 ≤20 ZJ-600 ZJ-300 WLW-100 17 DN200 DN100
JZJWLW600.300.200 600 ≤20 ZJ-600 ZJ-300 WLW-200 24.5 DN200 DN125

I. Preparations before starting the JZJWLW Roots reciprocating vacuum pump unit

1. Open the cooling water inlet valve and check if the cooling water is smooth.
2. Fill out the shaft seal cavity and the oil cup with lubricating oil, add the lubricating oil in the gear box and bearing box to the height of 2/3 ~ 3/4 of the diameter of the oil window, and use No. 1 vacuum oil for lubricating oil.
3. When used under the following conditions, corresponding measures must be taken:
a: When there is dust or particles in the suction gas, a dust collector or filter should be installed in front of the suction port; vacuum pump unit
b: If the inhaled gas is corrosive, neutralization measures must be taken;
c: When the suction gas contains water vapor, and the selected foreline pump is an oil-sealed mechanical pump, the foreline pump should be equipped with a gas ballast device. When there is too much water vapor, a condenser must be installed.

Second, the starting procedure:

1. Start the foreline pump.
2. Open the valve on the foreline pump pre-pump bypass pipe and the valve on the roots vacuum pump intake pipe.
3. JZJWLW Roots reciprocating vacuum pump unit will close the valve on the bypass pipeline when the pressure in the system reaches the inlet pressure allowed by the Roots vacuum pump. Restart the Roots vacuum pump; if bypass pipes and valves are not installed, the Roots vacuum pump should be started after the pressure in the system reaches the inlet pressure allowed by the Roots vacuum pump; if an automatic control device is used, the starting process can be automated .
4. According to the actual situation of the vacuum system, if it is a small sealed system, the Roots vacuum pump can be started immediately after starting the foreline pump; if it is a larger vacuum system, although the Roots vacuum pump with a bypass valve has overload protection Capacity, but considering the economy, the Roots vacuum pump should be started after the foreline pump has pumped to a certain pressure.

Third, the attention points in operation:

1. JZJWLW Roots reciprocating vacuum pump unit must be used in strict accordance with the technical specifications of Roots vacuum pumps. Under normal circumstances, the inlet pressure of Roots vacuum pumps is below 133 × 102Pa, and its maximum inlet pressure should not exceed its allowed maximum inlet pressure . If it is exceeded, although the ZJP Roots vacuum pump with bypass valve can be automatically protected, this protection is only an overload protection for the motor. Pumps can also fail due to overheating if they are operated for longer periods than the maximum allowable inlet pressure.
2. Pay attention to the load of the motor and the temperature rise of the pump at all times. Under normal circumstances, the maximum temperature rise of the pump must not exceed 40 ° C, and the maximum temperature must not exceed 80 ° C.
3. There should be no abnormal vibration during operation.
4. If you find that the motor is overloaded during operation, the temperature is too high, the sound is abnormal, or the vibration is too large, you should immediately stop the machine and check the cause, and remove the fault in time.

Fourth, shutdown procedures:

1. Close the foreline oil-sealed mechanical pump gas ballast valve (if the foreline pump is open when the ballast valve is in use).
2. Close the roots vacuum pump inlet valve. Vacuum pump unit
3. Stop the pump step by step: Stop the Roots vacuum pump first, and then stop the foreline pump. It is forbidden to mistake the shutdown sequence.
4. While stopping the foreline pump, deflate the inlet of the foreline pump immediately.
5. Close the cooling water inlet valve.
6. If you need to stop using the pump for a long time, or to prevent the pump body from freezing in winter, you must drain all the cooling water in the pump.

One, Regular inspection of JZJWLW Roots reciprocating vacuum pump unit

1. Daily inspection:
a: Check the oil level: too much oil will increase the temperature, and too little oil will cause poor lubrication;
b: Check temperature: Check the temperature of each part of the pump with a thermometer;
c: Check the motor load: Measure the motor load with a power meter or current and voltmeter.
2. Monthly check:
Whether the coupling and gasket are damaged or loose.
3. Check every three months:
Whether the lubricant in the gearbox has deteriorated.
4. Check every six months:
a: Whether the lubricant in the front cover bearing box has deteriorated;
b: Whether the oil seal is worn;
5. Checked annually:
a: Whether the bearing is worn;
b: Whether the piston ring and piston ring bush are worn;
c: Whether the slight wear of the gear will affect the normal operation of the rotor and whether it needs to be adjusted.

Second, disassembly:

When disassembling and reassembling the roots vacuum pump , it must be performed in the following order:
1. Before disassembly, the clearance of each part of the rotor should be measured and recorded.
2. Try to avoid hitting with a heavy hammer. The removed parts must not be injured and should be properly stored.
3. Record the replacement reasons and usage of the parts that need to be replaced in detail.
4. Before reassembly, all parts must be cleaned and the burrs repaired.
5. The static sealing surface without gasket or gasket is evenly coated with "106" silicone rubber coating; the rubber seals used for static sealing should be coated with vacuum crocodile grease; ZJP type with bypass valve vacuum pump bypass valve Rings and surfaces must not be coated with any grease.
6. Adjust the clearance of each part of the rotor according to the clearance list (Table 4). Vacuum pump unit
7. Leak test must be performed after all installation.
8. After reassembly, trial operation and necessary performance tests must be performed, and they can be put into use after normal.

Table 3: Fault analysis and troubleshooting table

the reason Elimination method
Extreme pressure is not high Leaks in pipes and systems System leak detection
Leak in the pump Leak test the pump
Foreline pump ultimate pressure drops Repair or replace the foreline pump
The lubricant is too dirty or does not match the grade Change lubricant
Oil seal wear Replace oil seal
Leak at bypass valve Cleaning the bypass valve
Insufficient pumping speed Insufficient pipeline conductivity Increase pipeline conductivity
Foreline pump speed drops Repair or replace the foreline pump
Leak at bypass valve Cleaning the bypass valve
Motor overload Inlet pressure is too high Adjust and control inlet pressure
The rotor end face is in contact with the cover Adjust rotor end clearance
Foreline pump returns oil into pump cavity Install anti-oil back device
Bypass valve blocked, making outlet pressure too high Cleaning the bypass valve
overheat The foreline pump selected has insufficient pumping speed, resulting in excessive compression Reselect the foreline pump
Inlet pressure is too high Adjust and control inlet pressure
Poor cooling Unblocked cooling water
Gearbox with too much lubricant Adjust the amount of oil
The rotor is in contact with the pump casing trim
Gear, bearing, oil seal poor lubrication Ensure proper oil volume and good lubrication
Sound abnormal Poor assembly Reassemble
The position of the guide gear and the rotor deviates, causing the rotor to collide Adjust position and ensure clearance
Inlet pressure is too high Adjust and control inlet pressure
Damage to gear due to overload or poor lubrication Change gear
Bearing wear Replace bearing
Bearing and gear wear early Defective lubricant Change lubricant
Insufficient lubricant Replenish

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