Kedi specializes in the research, production, and sales of vacuum equipment.

The JZJX Roots Blower Vacuum Unit is a combination of a Roots pump as the main pump and a scroll pump as the preliminary pump in series. By selecting a scroll pump as the preliminary pump, the Roots Blower Vacuum Unit overcomes the drawback of low vacuum extraction rate under certain pressure when using a scroll pump, while retaining the advantages of the Roots pump, such as quick operation and high vacuum extraction rate. Due to its compact structure, large extraction speed, and small land occupation, the unit can replace multiple mechanical vacuum pumps. Therefore, the Roots-Scroll pump unit is widely used in various industries, including vacuum smelting, electric capacitor, transformer vacuum heat treatment, vacuum coating equipment pre-evacuation, and electric vacuum semiconductor, for extracting gases from sealed containers with low oxygen content, non-explosive, non-corrosive to metals, non-reactive with pump oil, and free of particulate matter.