KDI focuses on the research, development, production, and sales of vacuum equipment.

Standard vacuum systems cannot meet the requirements of oil-free and corrosion-resistant cleaning. Many oil-filled vacuum systems have been replaced by oil-free, clean vacuum systems. Oil-free and environmentally friendly dry vacuum systems are set to accelerate the replacement of water ring pumps, water jet vacuum pumps, reciprocating pumps, and oil-sealed mechanical pumps. Screw vacuum pumps are a non-contact dry pump that emerged as an ideal vacuum pump in the early 1990s. They are characterized by a wide suction speed range, simple and compact design, friction-free suction chamber components, long service life, low energy consumption, and oil-free contamination.

The screw vacuum pump consists of a working chamber formed by a pair of parallel helical rotors and the pump housing, with no friction between the rotors and the housing and maintaining a certain gap. The two rotors and the housing form a sealed cavity, and as the rotors rotate, they continuously compress and discharge the gas within the sealed cavity to the exhaust port. Since the screw vacuum pump does not require oil lubrication or water sealing, the pump chamber is oil-free, making it an oil-free dry vacuum pump. It offers unparalleled advantages in solvent recovery processes in applications requiring oil-free cleanliness in the semiconductor and electronics industries. It is a replacement product for reciprocating pumps, water ring pumps, water jet vacuum pumps, oil-sealed slide valve vacuum pumps, diaphragm vacuum pumps, and Roots blower units.

A single stroke of a screw vacuum pump is equivalent to a single stage pump, while a multi-stroke screw vacuum pump is akin to a multi-stage pump in series. Compared to dry vacuum pumps with multi-stage series like claw vacuum pumps and multi-stage Roots vacuum pumps, the screw vacuum pump, with no internal channels between stages, directly pushes gas from the suction side to the discharge side. This makes it less prone to clogging and easier to clean when removing condensable gases, dusty, and particulate-laden gases. The pressure of the inhaled gas is smoothly increased above the pressure at the discharge point. This design ensures that the discharged gas does not contain any oily substances. The motor's power is transmitted to the drive shaft via a coupling device, and the main rotating shaft then transmits power to the driven shaft through a gear ratio transmission.

Application Range

① Power: Transformers, Current Transformers, Epoxy Resin Vacuum Impregnation, Capacitor Vacuum Oil Immersion, Vacuum Pressure Impregnation.

Chemical: Product distillation, drying, degassing, concentration, material conveyance.

③ Industrial Furnaces: Vacuum brazing, vacuum sintering, vacuum annealing, vacuum pressure quenching, vacuum dehydroxylation, etc.

④ Vacuum Coating: Vacuum Evaporation Coating, Vacuum Magnetron Sputtering Coating, Continuous Coating on Film Rolls, Ion Plating, etc.

⑤ Metallurgy: Special steel smelting, vacuum induction furnace, vacuum desulfurization, degassing.

⑥ Aerospace: Vacuum simulation tests including spacecraft orbital module, reentry module, rocket attitude adjustment module, astronaut suits, extravehicular activity by astronauts, and aircraft takeoff.

⑦ Vacuum Drying: Vacuum drying by pressure reduction, gas oil tank drying, wood drying, vegetable freeze-drying, etc.

Section 8: Electronics Industry, Semiconductor Industry.