Dry screw vacuum pumps are the trend

For dry pumps, compared to liquid ring pumps, the biggest issue is outlet temperature control; if this problem isn’t properly addressed, their range of application will be limited. Additionally, too low an air volume is also a problem – as far as I remember, the maximum value is around 2000

Not suitable for dust and particle environments

There is another issue: aside from Europe, where dry pump units must have explosion-proof certification, manufacturers in other regions do not take explosion protection into consideration. China also lacks specific standards in this regard; usually, flame arresters are used during import and export to address this issue, but this approach poses certain safety risks

If the problems of those mentioned above can be resolved, there is indeed great potential for development; however, using water ring pumps for wastewater treatment is quite troublesome

During operation of the dry pump, the temperature inside the pump chamber reaches around 250 degrees at most. As mentioned on the second floor, the outlet temperature is high; however, after the gas exits the dry pump and passes through the built-in water-cooled silencer, its temperature can be reduced significantly, to around 70 degrees. This level is generally acceptable for most processes. For certain processes, however, there have been cases where the gas composition led to low temperatures that caused crystallization, and in such situations, it was desired that the exhaust gas be directed directly into a condenser afin to enable solvent recovery. There are also series of dry pumps suitable for applications involving dust and particles. Generally, before the gas enters the suction inlet of the dry pump, there are certain requirements regarding the gas temperature, which is usually required to be below 40 degrees. The standard series handles gases containing dust and particulates; filtration takes place first on the inlet side, and even a small amount that enters the pump body is forced out by the twin screws of the dry pump. During operation, the twin screws of the dry pump function like a meat grinder. The air volume of dry pumps is indeed not very high, generally ranging from a few hundred to over a thousand cubic feet per hour; this is unlike rotary vane pumps, which can achieve volumes of tens of thousands of cubic feet per hour. Due to limitations in current manufacturing techniques, dry pumps cannot have a very high air volume, but they can be used in combination with rotary pumps, with the dry pump serving as the pre-stage pump, thereby allowing for an increase in the air volume.

:):handshake

During operation, the temperature inside the pump chamber of a dry screw pump is around 250 degrees. The temperature at the exhaust port of the vacuum pump is relatively high; however, after passing through the custom-made water-cooled silencer, the outlet temperature drops to around 60 or 70 degrees. The function of the silencer is to provide cooling, noise reduction, and fire protection. This temperature is generally acceptable for most processes, depending on the specific process conditions. I once had a client whose gas mixture contained substances that tend to crystallize; this client did not want the temperature to be lowered and instead wanted the gas to be discharged directly into their condenser for solvent recovery. Our company’s dry screw pumps are designed specifically for use in environments with dust and particles. Additionally, these dry pumps have certain requirements regarding the temperature of the gas being drawn in – it generally should not be higher than 40 degrees. Gases containing dust and particles usually pass through a filtering device before reaching the inlet. The twin screws inside the dry pump function like a meat grinder, allowing dust and particle matter to be expelled from the pump during the compression process. The gas pumping capacity of dry screw pumps is indeed not as high as that of water ring pumps, which can reach tens of thousands of cubic meters per hour; however, such pumps can be designed according to specific operating conditions. By using them in combination with rotary vane pumps as pre-pumps, the gas flow rate can be significantly increased. Dry pumps have the advantages of being oil- and water-free, environmentally friendly and clean, as well as offering high vacuum levels. However, their initial investment cost is relatively high; yet when operational costs are taken into account, they still present significant advantages. The best choice should be made based on different processing requirements and customer needs.

There is significant pressure to protect the environment these days, and it is a trend, as well as an inevitable necessity, for oil-free and water-free dry screw vacuum pumps to replace traditional water ring pumps, jet pumps, and oil-based pumps. Chemical industrial parks adopt policies specific to each park and each factory, aiming at the integrated utilization of resources within those parks through a process of survival of the fittest. The mindset of some companies is gradually changing. The future market for dry pumps is very promising. Our company specializes in providing vacuum solutions and dry screw vacuum pump products. We welcome inquiries and discussions from clients; please contact us at 17625827482, Mr. Wan: handshake

Nash, Puxu, and Edward all have similar pumps; nowadays many companies are upgrading to dry screw pumps in place of steam-jet vacuum systems in order to reduce costs