The ZJ Roots vacuum pump is mainly composed of a pair of synchronous high-speed rotating "8" shaped rotors and two semicircular pump chambers.
The pump cannot be exhausted alone, and must be used in series with the backing pump (such as slide valve pump, rotary vane pump, water ring pump, oil ring pump, etc.).
Connecting the ZJ type roots vacuum pump in series in front of the air inlet of the foreline pump to form a unit can increase the vacuum of the foreline pump and greatly increase the pumping rate within the effective range.
The ultimate pressure of the roots vacuum pump is determined by the backing pump. The data in the table is the lowest ultimate pressure of the standard configuration (equipped with a two-stage oil-sealed mechanical vacuum pump).
Roots pumps are widely used in vacuum casting, vacuum melting, vacuum degassing, vacuum coating industry and vacuum distillation and vacuum drying in the chemical and pharmaceutical industries.
ZJ Roots vacuum pump is not sensitive to a small amount of dust.

Product introduction of Roots rotary vane vacuum unit: JSJX Roots rotary vane vacuum unit is composed of Roots pump as the main pump and rotary vane pump as the front pump in series. Its structure is compact and easy to operate. It is used to extract air and other non-condensable and non-corrosive gases, and is widely used in various vacuum systems that require high pumping speed and high vacuum. Such as: vacuum smelting, power capacitors, transformers, vacuum impregnation treatment, pre-pumping in vacuum coating equipment, etc. The purpose of the roots water ring vacuum unit: 　　 JZJ2B (S) series roots water ring unit is made of ZJ type roots pump as the main pump, 2BV (2SK) type liquid ring vacuum pump or roots-liquid ring vacuum unit as the front An air extraction unit composed of stage pumps. It can not only be used to remove general gas, but also gas containing water and a small amount of dust. Compared with general mechanical vacuum pumps, it has the advantages of not being afraid of oil pollution, moisture and fine dust; compared with general liquid ring vacuum pumps, it has the advantages of high ultimate vacuum and high pumping speed under higher vacuum conditions. It is an ideal vacuum pumping equipment for drying, dehydrating and vacuum degassing in textile, food, chemical, pharmaceutical and other industries.