There are many manufacturers of vacuum mixers in China. The annual sales of all vacuum mixers are about 100 million to 500 million yuan, which is only equivalent to the annual sales of a vacuum mixer. Through the analysis of the global vacuum mixer Market, we can see that the market and application fields of various vacuum mixers are constantly changing and developing. China's vacuum mixer manufacturing industry has a long history and strong foundation. Domestic true mixers have been applied and verified in various fields. Some mixers are also exported abroad, recognized and praised by foreign users. It should be said that China's vacuum mixer manufacturing industry still has a huge development space in the domestic and foreign markets.
1. Liquid ring mixer
Although liquid ring mixer belongs to coarse vacuum mixer, it still has a large market in China's petroleum, chemical industry, electric power, light textile, papermaking, medicine and other fields. In foreign countries, the sales of liquid ring mixers account for 14% of the total vacuum mixer Market, second only to dry mixers. Therefore, Nash, seimems and Kinney have invested in building factories or sales networks in China to continuously expand their market share in China. Since most of the liquid ring mixers are castings with low processing requirements and belong to labor-intensive products, the domestic liquid ring mixers have competitive advantages in price. The key is to improve the design, reduce the volume, reduce the weight, improve the efficiency and reduce the energy consumption.
2. Slide valve mixer
Because the slide valve mixer is relatively durable and reliable, all kinds of vacuum furnaces, coating machines, drying, impregnation and other equipment at home and abroad use the slide valve mixer as the front mixer. However, the slide valve mixer has heavy casting and large processing workload, so foreign vacuum plants are looking for partners in China. In order to make the domestic slide valve mixer enter the international market, it is necessary to further reduce the vibration and noise of the mixer, eliminate oil injection and oil leakage, and improve the long-term operation reliability of the slide valve mixer.
3. Direct rotary vane mixer
With the continuous expansion of vacuum technology in various application fields, the demand for direct rotary vane mixer is increasing. Due to the large number of such mixers, large processing and assembly workload and low price, some foreign vacuum manufacturers have established professional factories in China. Domestic small and medium-sized direct coupled rotary vane mixers have passed the technical test, and the price is much cheaper than foreign mixers. Therefore, domestic mixers still have competitive advantages. The key is to solve the problems of oil leakage of shaft seal and the performance and quality of rotary vane materials and vacuum mixing oil, so as to ensure the stable performance and reliable operation of direct coupled mixers at high speed and high temperature, At the same time, we should further improve the ability of domestic direct connected rotary vane mixer to remove water vapor.
4. Roots mixer
From the production of roots mixers abroad, the sales of their roots mixers account for no more than 5% of the global sales of roots mixers, and the total output of these five companies is only 20%. The output of roots mixers is small, but the price of foreign roots mixers is much higher than that of domestic mixers. At present, almost all large or small high vacuum and medium vacuum systems at home and abroad are equipped with roots mixers in order to shorten the extraction time and improve production efficiency. Therefore, domestic roots mixers must try to enter the international market on the basis of occupying the domestic market. In this way, it is necessary to further reduce the vibration and noise of domestic roots mixers and completely solve the problem of shaft seal oil leakage, Improve the appearance quality of the mixer and improve the smoothness and cleanliness in the mixer. In addition, considering that the power frequency in some countries and regions is 60Hz, it is also necessary to ensure the long-term operation reliability of roots mixer under the condition of increasing the speed.
At present, the domestic air-cooled direct exhaust roots mixer has made rapid progress and is technically mature. Because the mixer is equipped with a gas cooler under the exhaust port, part of the cooled gas returns to the mixer cavity through the pipe to cool the rotor, so as to balance the compression heat, the mixer can directly exhaust the atmosphere. In order to meet the requirements of different limit vacuum degrees, this mixer can be used in series. Generally, an air-cooled direct exhaust atmospheric Roots mixer is added in front of it, and the limit vacuum reached is one order of magnitude higher than that of the previous mixer. Because there is no working medium in the mixer cavity, this mixer actually belongs to a dry mixer. At present, this air-cooled direct exhaust roots mixer and unit have been used in petroleum, chemical industry, plastics, pesticides and steam turbine rotor dynamic balance.
5. Molecular mixer
Molecular mixer is used to replace low-temperature mixer in many process occasions in foreign semiconductor field, especially sputtering, etching and LCVD. Color composite molecular mixer and traction mixer are used as the main mixer.
Because the pumping speed of the molecular mixer for water vapor is only one fourth of that of the low-temperature mixer with the same caliber, the exhaust time of the molecular mixer is longer than that of the low-temperature mixer. In order to improve the pumping speed, a low-temperature cold plate of - 130 ℃ ~ - 150 ℃ is installed at the inlet side of the molecular mixer abroad, which is called the low-temperature molecular mixer. The water vapor is captured by the low-temperature plate, and other gases are pumped away by the molecular mixer. The application of this low temperature molecular mixer in vacuum coating device not only improves the production efficiency, but also improves the film quality. With the rapid development of China's semiconductor industry, film industry and scientific research, molecular mixer should be the focus of China's vacuum mixer manufacturing industry. Firstly, a complete series of molecular mixers should be established from small to large, and various composite molecular mixers, traction mixers and low-temperature molecular mixers should be studied and developed to meet the needs of different occasions.
6. Dry mixer
The continuous growth of foreign dry mixer Market is mainly driven by the rapid development of semiconductor industry, chemical industry and film industry. In Japan, the semiconductor industry has completely replaced the oil sealed mechanical mixer with dry vacuum mixer, and more than 45% of the European and American semiconductor industries have replaced the oil sealed mechanical mixer with dry vacuum mixer, greatly improving the performance and quality of products. In order to meet the requirements of different application fields and working conditions, there are multistage roots vacuum mixer, multistage claw vacuum mixer, screw vacuum mixer, vortex vacuum mixer, reciprocating piston vacuum mixer and turbine oil-free vacuum mixer abroad. The limit pressure is from 10Pa to 10-2Pa, and the pumping speed is from 20m3 / h to 500m3 / h. According to statistics, at present, the application of domestic dry mixers is less than 1%. All dry mixers for domestic semiconductor industry are imported from abroad, and their prices are very expensive. Therefore, China should vigorously research and develop dry mixer to make it a new economic growth point of vacuum industry in China.