1. Vacuum degree

The limit vacuum degree of dry screw vacuum pump, claw type vacuum pump and oil-free scroll vacuum pump are very high, and the maximum limit vacuum can reach 1-2pa. The limit vacuum of kelexi's dry screw vacuum pump has exceeded 0.1pA; the oil-free reciprocating vacuum pump is a coarse vacuum equipment with low limit vacuum, which needs to be improved with roots and other vacuum pumps.

2. Pumping capacity

Due to the internal structure problems, the oil-free scroll vacuum pump has a small pumping capacity, so it can only be used in the process of small air extraction; the dry screw vacuum pump has a complete range of models, which can be used in the process of large gas extraction, and can meet the needs of different customers with roots vacuum pump.

3. Stability

The dry screw vacuum pump has stable performance, low noise and low failure rate; the oil-free reciprocating vacuum pump has simple structure and high noise, so it needs to replace the sliding vane frequently. Due to the complex assembly of claw type vacuum pump, the rotor and shaft are not integrated. In case of failure, all of them need to be disassembled and assembled again and again, so as to reduce the product performance and stability.

4. Special working condition treatment

Due to the flammable, explosive and corrosive gases contained in the process gas of chemical, pharmaceutical and semiconductor industries, the dry vacuum pump needs special treatment. The internal structure of the dry-type screw vacuum pump is simple, two rotors and pump cavity can be treated with anti-corrosion treatment. The common coatings are Ni-P coating and Teflon coating. The kalexi dry-type screw vacuum pump adopts special multi-layer nickel plating and nano material coating, which can effectively prevent the corrosion of high corrosive medium such as hydrochloric acid on the equipment. It is very difficult to do anti-corrosion treatment for claw type vacuum pump, and the surface treatment is almost impossible between all stages of clapboard, and the anti-corrosion coating on the surface of rotor is easy to be damaged during assembly. The oil-free scroll vacuum pump is only suitable for pumping clean gas, but not flammable, explosive and corrosive gas.