Regarding questions about dry screw vacuum pumps, feel free to share and ask for advice
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Over the past few years, with the rise of dry screw vacuum pumps, more and more people have become interested in learning about this type of equipment. Therefore, to help more people understand this environmentally friendly new device that can replace traditional water ring pumps, jet pumps, reciprocating pumps, and slide valve pumps, this post is created! To avoid having our posts deleted, we will not mention our company’s name here. Having been in the vacuum industry for nearly three years, I have experienced several cases firsthand, and I hope this can help others. I also hope to take this opportunity to learn and accumulate more knowledge, so as to be better able to solve problems for customers in the future. Everyone is welcome to ask questions and speak actively.
What is the biggest difference between dry pumps and conventional water ring pumps? In which industries is it mainly used?
The following response is intended mainly for those who are not familiar with dry pumps; it is explained from the perspective of someone who was once an outsider, so professionals should please avoid criticizing it! Thank you! In foreign countries, a dry pump mainly refers to a dry screw vacuum pump (hereinafter referred to as a dry pump). It is a true dry pump. The main difference between it and a water ring pump is that a water ring pump uses the rotation of an impeller to create a non-circular water ring inside the pump chamber; by changing the properties of this water ring, gas is drawn in, thereby creating a vacuum. In a dry screw vacuum pump, there is no medium such as water or oil inside the chamber; it relies on the sealed volume formed between a pair of high-speed rotating rotors within the pump chamber to draw in gas and thereby create a vacuum. Currently, dry pumps used in China generally feature small clearances and low rotation speeds, unlike the large-scale dry pumps produced by German company Schich, which have large clearances and high rotation speeds; the synchronous motors used in these German pumps rotate at nearly 10,000 revolutions per minute. China does not yet have the capability to produce such motors. As a result, Schich’s pumps are able to operate quietly even under harsh working conditions, which is truly admirable on the part of this competitor. At present, dry pumps are not as widely used as water ring pumps; however, in recent years they have been extensively applied in applications that require a clean vacuum, such as in the semiconductor, photovoltaic, and LED industries ； ’At the same time, its advantages in pharmaceutical production, particularly in areas such as three-in-one drying, vacuum distillation, and rectification for active pharmaceutical ingredients, are becoming increasingly evident; as a result, it is being adopted by more and more customers ； There is also a strong demand for dry pumps in the field of fine chemicals. However, the biggest obstacle at present is the inability to completely solve the problem of corrosion. Due to limitations in the materials used for dry pump rotors, the main anti-corrosion measures involve applying coatings such as Hastelloy plating, nickel-phosphorus plating, Teflon coating, or ceramic coatings. It is known that in conditions involving severe corrosion, easy polymerization, or crystallization, the effectiveness of these coatings is almost negligible; as a result, rotor jamming occurs frequently. This makes those who want to use dry pumps more cautious when making their choices. The above are merely some of my personal experiences; I hope they will be useful to everyone. Those who find them superficial may just laugh it off – please forgive me! :lol
Welcome to exchanges with peers; experts, please feel free to ask questions~! !