Dry screw pump is a new type of vacuum pump, which is developed to replace the traditional water ring vacuum pump, oil ring vacuum pump and other pump types. Because of its unique design principle, it can be oil-free and water-free, and can be used as corrosion-resistant coating. The excellent sealing design will far surpass the performance of traditional vacuum pump in any aspect except for a little more expensive price.

How to judge whether the dry screw vacuum pump is qualified can be judged from the following aspects:

1. Limit vacuum degree: of course, the lower the limit vacuum, the better. At present, the domestic one is about 5pa, while the imported one is about 1pA.

2. Vibration and noise: vibration must be small, noise must be less than 80 dB.

3. If it is used in a corrosive environment, it is better to ask the manufacturer for a sample of the same coating, and put it in the factory for a test. If the coating or coating ratio used by each manufacturer is different, its performance will be greatly different.

4. Sealing: This is also very important, but we can only learn from the manufacturer's instructions. The most direct way is to determine whether there is leakage through the medium after connecting to the system.

Basically, judging from the above points, the first and second points determine the level of machining and design technology of vacuum pump, which will really affect the service life of the pump, and the third and fourth points will also affect its service life, but it also needs to be proved by experiments.

Generally speaking, due to the high cost of screw pump, it is recommended to choose imported screw pump. It is relatively expensive in Europe, America, Japan and South Korea. Taiwan series is also a good choice.