Oil-free vacuum pump
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Our factory currently uses water jet pumps to create a vacuum. Considering the large amount of water required and its impact on the environment, we would like to use oil-free vacuum pumps instead. Due to significant material corrosion, the oil-free vacuum pumps purchased recently do not perform as well as expected. Are there any oil-free vacuum pumps with good corrosion resistance? (Note: the exhaust volume is 150 L/S)
Oil-free vacuum pumps are generally referred to as dry pumps, with the claw pump being the most common type. Generally, claw pumps have anti-corrosion coatings applied to the rotor and the inner side of the pump body, so they don’t tend to corrode. You should inform the manufacturer of your requirements. For imported products, I recommend Edward; for domestic ones, I recommend Beijing Langhe Vacuum.
2# lxn_663: The oil-free vacuum pump mentioned by the original poster refers to the vertical W pump, right? Our experience shows that if the raw material is corrosive to iron ions, it is necessary to use a water flushing pump in severe cases; in less severe cases, adding a neutralization tank before the pump yields satisfactory results. Based on our experience, the products produced by Taizhou Xinyu are much better than those made by several companies in Jiangsu. Feel free to contact me if you have any questions. 13676886196
We also tried claw pumps, but it didn’t work. This is because the rotor clearance of claw pumps is small, similar to that of rotary vane pumps. Even a small amount of particles entering the pump chamber can cause it to jam.
Currently, WLW vacuum units are being used, but since a small amount of material gets mixed into the gas during vacuum creation, this causes severe corrosion to the piston vacuum pumps in the preceding stages. It has an unpleasant smell; I’m not sure what can be done to deal with it?
There are corrosion-resistant vacuum oil-free pumps; it’s really not possible to use three buffer tanks – the first one for buffering, the second one for absorbing water, and the third one for dry buffering
I think the best approach is to neutralize the corrosive gases first before letting them enter the vacuum pump. Our company faced similar issues, and things improved significantly after making that change. However, LZ, please be aware of the saturated vapor pressure of water under high vacuum conditions – it’s not possible to raise the temperature of the water! !
Thank you. The Roots pump currently in use is coated, but its performance isn’t very good. The mechanical vacuum pump used as a pre-stage pump has difficulties with feed intake and suffers from significant corrosion; two buffer tanks were used, yet the problem persists
Could you tell us what kind of corrosive gases you are dealing with, and what materials are used for the oil-free pumps at present? If you provide detailed information, everyone will be able to suggest appropriate solutions. Could we consider adding a condenser and a drying buffer tank before the pump?
The corrosive gases at present are mainly lipid-based gases. The material used for mechanical vacuum pumps is carbon steel, while rotary vane pumps have a carbon steel core coated with a layer of material. When gas is introduced into the mechanical vacuum pump, it can be seen from the current state of disassembly that the mechanical pump is severely corroded. I’m looking for a WLW-F type material that is resistant to corrosion; the material should be stainless steel. I’ve asked many manufacturers, but none have it in stock. It’s possible that the gas flow rate is too high (150 L/S). I’m not sure which manufacturer would be a good choice, especially one that offers excellent after-sales service