Liquid ring pump
Although the liquid ring pump is a rough vacuum pump, it still has a large market in China's petroleum, chemical, electric power, textile, paper, and pharmaceutical fields. The working principle of the liquid ring pump is abroad. The sales of the liquid ring pump account for 14% of the total vacuum pump market, second only to the dry pump. Since most of the liquid ring pump is a casting, the processing requirements are not high, and it is a labor-intensive product. The domestic liquid ring pump has a competitive advantage in price. The key is to improve the design, reduce the volume, reduce the weight, improve the efficiency, and reduce the energy consumption.
Slide valve pump
Because the spool valve pump is more durable and reliable, all kinds of vacuum furnaces, coating machines, drying and impregnation equipments at home and abroad use the slide valve pump as the foreline pump. The working principle of the slide valve pump is that the sliding valve pump castings are heavy and the processing workload is heavy. Larger, so foreign vacuum plants are looking for partners in China. In order to enable the domestic spool valve to enter the international market, it is necessary to further reduce the vibration and noise of the pump, prevent fuel injection and oil leakage, and improve the reliability of the long-term operation of the spool pump.
Direct coupling 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 processing and assembly work is very large, and the price is very low, so some foreign vacuum manufacturers set up professional factories in China. The domestic small and medium-sized direct-coupled rotary vane pump has been technically passed, and the price is far cheaper than that of foreign pumps. Therefore, domestic pumps still have competitive advantages. The key is to solve the problem of shaft seal oil leakage and performance quality of rotary vane material and vacuum pump oil. To ensure the stability and reliable operation of the direct-coupled pump at high speed and high temperature, and to further improve the ability of the domestic direct-coupled rotary vane pump to remove water vapor.