Classification of vacuum pumps

liquid ring pump

Although the liquid ring pump is a rough vacuum pump, it still has a large market in the fields of petroleum, chemical industry, electric power, light textile, papermaking, medicine and so on. The working principle of liquid ring pumps In foreign countries, the sales of liquid ring pumps account for 14% of the total vacuum pump market, second only to dry pumps. Because most liquid ring pumps are castings, the processing requirements are not high, and they are labor-intensive products. Domestic liquid ring pumps have a competitive advantage in price. The key is to improve design, reduce volume, reduce weight, improve efficiency and reduce energy consumption.

Sliding valve pump

Because the spool valve pump is relatively reliable, various vacuum furnaces, coating machines, drying, dipping and other equipment at home and abroad use the spool valve pump as the backing pump. , so foreign vacuum factories are looking for partners. In order for the domestic spool valve pump to enter the market, it is necessary to further reduce the vibration and noise of the pump, avoid oil injection and oil leakage, and improve the long-term operation reliability of the spool valve pump.

Direct-connected rotary vane pump

With the continuous expansion of vacuum technology in various application fields, the demand for direct-coupled rotary vane pumps is increasing. Due to the large number of such pumps, the heavy processing and assembly workload, and the low price, some foreign vacuum manufacturers are establishing specialized factories. Domestic small and medium-sized direct-coupled rotary vane pumps have passed the technical level, and the price is far cheaper than foreign pumps, so domestic pumps still have a competitive advantage. The key is to solve the oil leakage of shaft seals and the performance and quality of rotary vane materials and vacuum pump oil. , to ensure that the direct-coupled pump has stable performance and reliable operation at high speed and high temperature, and at the same time, it is necessary to further improve the ability of domestic direct-coupled rotary vane pumps to remove water vapor.

Roots pump

From the perspective of foreign Roots pump production, several large foreign companies, such as Leybold, Balzers, Alcatell, Edwards and ULVAC, the sales of their Roots pumps account for less than 5% of the sales of Roots pumps. The total of these 5 companies is only 20%. The output of Roots pumps is not large, but the price of foreign Roots pumps is much higher than that of domestic pumps. Almost all large or small high vacuum and medium vacuum systems at home and abroad are equipped with Roots pumps in order to shorten the pumping time and improve production efficiency. Therefore, domestic Roots pumps must try to enter the market on the basis of occupying the domestic market. Further reduce the vibration and noise of the domestic Roots pump, solve the oil leakage problem of the shaft seal, improve the appearance quality of the pump, and improve the smoothness and cleanliness of the pump. In addition, it is also necessary to take into account that the power frequency of some countries and regions is 60Hz, and it is necessary to ensure the reliability of the long-term operation of the Roots pump under the condition of increasing the speed.