In today's increasingly stringent environmental protection requirements, oil-free clean DVE vacuum pumps play an important role in modern industry. The configuration of oil-free DVE vacuum pumps and other related equipment is directly related to the quality of oil-free DVE vacuum pumps. Whether the performance can be effectively exerted, but the major drawback of oil-free DVE vacuum pumps is that the vacuum degree is not high, like WX series oil-free rotary vane DVE vacuum pumps; WLW series vertical oil-free reciprocating pumps have a vacuum degree of about 2000pa. But this pump also needs DVE vacuum pump oil as a lubricant, which is less than 100% oil-free; but there is also a pure oil-free scroll DVE vacuum pump with a vacuum degree of 10pa, but the price will be much higher. Many companies Not willing to invest, had to continue to use the original DVE vacuum pump, causing continued damage to the environment.

The material vapor is basically condensed into a liquid in the main condenser, but under vacuum conditions, the gas molecules move faster, the gas density decreases, the condensation temperature of the material drops, and the total heat transfer coefficient of the condenser decreases exponentially. Condensation of lower materials (one-time condensation) is often not very sufficient, especially for low-boiling solvents.

Part of the gas that is not sufficiently condensed is liquefied in the DVE vacuum pump as the pressure changes, and the other part is condensed under normal pressure in the exhaust-side condenser (secondary condensation).
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