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ZJ Series Roots Pump


ZJ series Roots pump is a positive displacement vacuum pump. Its main advantage is that it has

a high pumping rate at a low inlet pressure. It is one of the main pumping equipment to obtain medium and high vacuum at present. Its disadvantage is that it is not allowed to work with high differential pressure, otherwise it will be damaged due to overload. Therefore, when using it, it must select a reasonable pre-stage vacuum pump to cooperate, one is to protect, the other is to improve the pumping efficiency and obtain higher vacuum. ZJP series Roots pump has a good protection effect on the pump due to its internal overflow valve.

Roots vacuum pump is widely used in smelting, degassing and rolling in vacuum metallurgy, as well as vacuum distillation, vacuum concentration and vacuum drying in chemical, food and pharmaceutical industries. In view of the process of extracting a large amount of water vapor and solvent in chemical, pharmaceutical and other industries, our company has improved the sealing structure of the pump cavity and bearing cavity of the ZJ series Roots vacuum pump, greatly reducing the emulsification of oil in the bearing cavity and gear cavity, It makes ZJ series Roots vacuum pump more suitable to cooperate with water ring vacuum pump to extract a large amount of water vapor and solvent.

2、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.

Low vibration, low noise.

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.

The front vacuum pump of ZJP series Roots vacuum pump is generally oil-sealed mechanical pump.However, if the limit vacuum requirement is not high, other forms of coarse vacuum pump can be selected as the front vacuum pump. Especially when the gas containing a lot of water vapor is pumped, it is reasonable to select the liquid-ring vacuum pump as the front vacuum pump. Of course, the limit vacuum reached is lower.

Because the rotor is processed by high-precision special CNC machine tool, and has fine balance

verification, it has good geometric symmetry, and the rotor meshing clearance is uniform. The pump body and side cover are processed by special machine tools with high accuracy. Therefore, the Roots vacuum pump of our company operates smoothly, with low noise, small vibration and high limit vacuum.

Because the driving parts of the pump adopt reliable clearance elimination structure, the pump can work for a long time under high pressure difference.

Fast start, can reach the limit vacuum in a short time.

Since there are no sliding parts in the pump cavity, no oil lubrication is required, thus avoiding

the pollution of oil vapor to the system.

Safe and reliable, ZJP series is equipped with bypass valve for automatic protection.

Compact structure and small floor area. One of the left, right and lower exhaust ports can be selected to facilitate user installation.

3、Technical parameter

4、Performance curve of Roots vacuum pump


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     Phone : +86-130-0288-6558
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    Telephone:+86-0531-8750-3139
    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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