New dry screw pump

Linear or non-linear, which is often asked questions experts. Why mention this problem? This is about the vacuum screw pump tooth profile problem. The invention of Rietschle Thomas gives a clear answer: a non-linear screw pump is better.

In the past year, many important vacuum applications have adopted a dry screw vacuum pump. Especially in the chemical industry, pharmaceutical and other industrial enterprises even more so. The design principle of this screw pump is very simple: the two screw rotors rotate relatively in the pump body, compressing the sucked air and pushing it toward the outlet. This kind of screw pump meshing tooth shape is linear. If one looks closely at the dynamic state of the machine tool , one can easily see that most of the compression work is done in the last third of the length of the screw. This situation allows the surface temperature of the screw to compress up to 250 ° C. Therefore, the safety of use is often a big issue when compressing some deflagration gases.

After a great deal of research and hard work by Rietschle Thomas, a new screw profile has been used in the new series of Twister screw pumps. This profile has a non-linear lift in its compressed work area. The advantages of shape are:

★ compression temperature is lower

★ save a lot of driving energy

★ compact structure

Due to the structural design has been improved to improve the basic performance of the vacuum pump, which can be a single-stage compression to obtain a high degree of vacuum, unlike the previous two-stage compression required intermediate cooling, which has good liquid compatibility, Simple structure, can fully realize dry operation.

The following table shows the vacuum displacement of 250m3 / h, linear screw and non-linear screw vacuum pump performance comparison.

Comparison between Linear Screw Pump and Nonlinear Screw Pump
Linear non-linear inhalation capacity 250m3 / h 250m3 / h
Drive power 11kw 7.5kw
The final pressure ≤ 0.3mbar ≤ 0.3mbar
Outlet temperature up to 250 ℃ Typical: T4 / 135 ℃

T4 program for the first time

With this new screw design, Rietschle Thomas introduced the T4 screw vacuum pump to the market for the first time. The modernization of the 430 and 800 screw pump speed down. Making this screw pump, which meets the T4 standard, work safely and reliably. When choosing dynamic and static seals, Rietschle Thomas chose a reliable sealing system.

★ Static sealing element: Viton material is preferred, with PTFE or PTFE seals being chosen for special requirements.

★ dynamic sealing element: vacuum pump suction side: double seal lip; vacuum pump exhaust side: simple with a gas ring to prevent gas spill to prevent solid matter into the pump.

In order to make this type of vacuum pump suitable for use in common workplaces, Rietschle Thomas designed this type of non-linear screw vacuum pump in a range of different sizes, for example 100, 200, 320, 430, 800 and so on. These models are based on the European vacuum technology standard final suction pressure as the standard, the new screw pump final pressure ≤ 0.3mbar.

Low final pressure and long lasting continuous operation make this pump suitable for use in the following areas: Diluent Recovery, Drying, Degassing, Evaporation, Continuous Sterilization or Disinfecting, Vacuum Packaging, Additives And coating process and so on.