A vacuum is a state of space without any matter.In fact, in vacuum technology, vacuum is for the atmosphere.Industrial vacuum refers to the gas space where the pressure is less than the standard atmosphere.In general, it refers to the degree of thinness of the gas in a particular space.Vacuum in industrial applications can be roughly divided into three categories: high vacuum, medium vacuum and low vacuum.The vacuum can be obtained in a variety of ways, and the rotary vane vacuum pump is one of the most basic vacuum collection devices in vacuum technology.
Rotary vane pumps are mainly small and medium pumps. Rotary vane vacuum pump rotates in the pump chamber by a bias rotor with a rotating vane, which periodically changes the volume of the pump chamber separated by the rotating vane to achieve the process of suction, compression and exhaust, thus achieving the goal of continuous suction. Generally speaking, according to the mode of operation, there are oil-type rotary vane vacuum pump and oil-free rotary vane vacuum pump, that is, the difference between oil lubrication and oil-free lubrication; according to the classification of cylinder block, single-stage and double-stage are the main types.The so-called two-stage structure is the connection of two single-stage pumps, usually made into two-stage pumps, in order to obtain a higher vacuum.
The rotating vane vacuum pump can extract dry gas from the sealed container, and a certain amount of condensable gas can also be extracted if the additional gas ballast.But it is not suitable for extracting gases with high oxygen content, corrosive to metals, chemical reaction to pump oil and particulate dust.Most rotary vane vacuum pumps adopt direct connection structure, which can start vacuum pumps directly in the atmosphere, and equipped with air filters, effectively isolate small dust particles, and have longer service life.
Advantages and disadvantages of oil-type rotary vane vacuum pump and oil-free rotary vane vacuum pump
1.one. At the same pumping speed, the oil-type rotary vane vacuum pump has a higher vacuum degree than the oil-free rotary vane vacuum pump. In the continuous operation of oil-type rotary vane vacuum pump, the double-layer seal of mechanical seals and lubricants makes the vacuum pump more stable in a series of actions of pumping, compressing and exhausting, and reduces the probability of gas leakage.
2. Oil rotating blade vacuum pump is more easily affected by water than oil-free rotating blade vacuum pump.Due to the limitation of blades, the oil-free rotary vane vacuum pump is easy to expand and break after contact with water, and has high sensitivity to water.The unique structure design of oil-type rotary vane vacuum pump can effectively separate oil and water, and has been widely used in industries with limited water content. Under the trend of paying more and more attention to environmental protection, the oil-type rotary vane vacuum pump with its own oil-water separator structure has been recognized and used by the public to effectively protect the environment clean.Such as PCB industry, glass production and so on.
3. Although the oil-free rotating blade vacuum pump is slightly lower than the oil-based rotating blade vacuum pump to some extent, it is more likely to be adopted by customers in some oil-sensitive industries because it does not require oil lubrication.Oil-free operation can limit the impact of oil on the product and reduce the oil pollution caused by chemical reactions between the oil and the product, such as the pharmaceutical industry, printing process.
Selection of single rotating blade and double rotating blade vacuum pump
Because the structure of the two-stage rotary vane vacuum pump is more than that of the single-stage rotary vane vacuum pump, the exhausted gas is compressed by the multi-stage cylinder, and the final vacuum degree is much better than that of the single-stage rotary vane vacuum pump.For example, the vacuum degree of the single-stage rotary vane vacuum pump is 0.1 ≤ 0.5 mbar, and the vacuum degree of the two-stage vacuum pump is about 4 × 10 ~ （- 4） mbar.
For the production process, the higher the vacuum, the better, suitable for your own production needs, is the best choice. Low vacuum degree will make the products can not achieve the desired effect, requiring secondary processing and increasing cost; while high vacuum degree may destroy product density, or even make the products irreparable, leading to product scrap.
As far as industrial use is concerned, the oil rotary blade vacuum pump has a wider range of applications and has been recognized and used by larger groups.Mainly used in vacuum packaging and food processing technology, vacuum degassing, defoaming, osmosis, concentration, drying vacuum adsorption, fixtures, hangers, suckers, etc. Oil-type rotary vane vacuum pump can be used in practical applications to transform the industrial vacuum central system according to the needs of customers‘own process, and become a powerful front-end pump to supply the real needs of production process.Empty, empty.
At present, there are many brands of vacuum pumps in the domestic market, which gives more choices to users. Imported and domestic vacuum pumps have been recognized by the public. The import pumps that customers need to choose are mainly vacuum pumps from Germany, Japan, Britain, France and the United States. At present, Puxu, Leibo, Richelle and Baker are widely used in Germany, Ephako, Heliwan, Junihara, Cassiyama, Edward, Atlas and Alcatel, France. With the continuous improvement of domestic technology, imports are made. The high cost of purchasing and repairing vacuum pumps limits their application to a great extent. Domestic imported brands of maintenance service providers and imported vacuum replacement pumps emerge as the times require. Domestic has formed a certain scale of vacuum pump entity manufacturers, such as Dongguan Dalutong, Shanghai Zhongde, Nantong Weishi, Beiyi Youcheng and so on, and has gradually been recognized and promoted by customers.
Under the tide of information technology reform, the global sharing of technology, domestic vacuum technology has gained more confident users. More and more customers tend to have the ability of physical manufacturing manufacturers, in the trend of price and quality peer, domestic manufacturers regardless of price and after-sales service follow-up, highlighting the advantages.