Vacuum pump is a very practical and very important pump nowadays. Because of its different use conditions and application scope, of course, there are more than one kind of it. Vacuum pumps generally have liquid ring pumps, sliding valve pumps, direct rotary vane pumps, Roots pumps and so on, so what are their characteristics?
Most of the liquid ring pumps are castings with low processing requirements. They are labor-intensive products. Therefore, domestic liquid ring pumps have competitive advantages in price. The key is to improve design, reduce volume, reduce weight, improve efficiency and reduce energy consumption.
The sliding valve pump is durable and reliable. Various vacuum furnaces, coating machines, drying and impregnation equipments at home and abroad use the sliding valve pump as the front pump. However, the casting of the sliding valve pump is heavy and the processing workload is heavy. In order to make domestic spool pump enter the international market, it is necessary to further reduce the vibration and noise of the pump, eliminate oil injection and leakage, and improve the reliability of long-term operation of spool pump.
There are many direct-coupled rotary vane pumps, which have a large workload in processing and assembling and a low price. Domestic small and medium-sized direct-coupled rotary vane pumps have passed the technical barrier and their prices are much cheaper than those of foreign pumps. Therefore, domestic pumps still have competitive advantages. The key is to solve the problems of oil leakage from shaft seals, the performance quality of rotary vane materials and vacuum pumps, and to ensure the stable performance and reliable operation of direct-coupled pumps at high speed and high temperature. At the same time, domestic pumps still have competitive advantages. Further improve the capacity of domestic direct rotary vane pump to extract water vapor.
Roots pump is equipped with a gas cooler under the exhaust port. Some of the cooled gas is returned to the pump chamber through the pipeline to cool the rotor, so that the heat of compression is balanced, so the pump can discharge the air directly. It is very popular in the fields of petroleum, chemical industry, plastics, pesticides, dynamic balance of steam turbine rotor and aerospace.
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