Analytical equipment needs vacuum pumps, and the durability of such pumps is crucial. Frequently, the working conditions of rotary vane pumps inside an analyzer's interior include restricted venting and complicated access to the pump compartment. The pump's heat output might cause problems with the reliability of electrical parts.
The Importance of Choosing the Right Rotary Vane Pump to Minimize Overheating Issues
A rotary vane pump optimized for low temperatures is used to reduce the impact of temperature on the system. It might have its tolerance for water vapor optimized throughout the design process. It causes the pump to overheat. Water vapor tolerance is beneficial for the pump, while oil back-diffusion and limited heat dissipation are bad.
Cooling slots are standard in pump housings. Always keep the minimum distance between the wall and the analyzer that the manufacturer suggests for optimum cooling. Thermal performance and leakage varied significantly between rotary vane pumps and their accessories. Selecting the right pump and accessories might provide notable benefits.
Recurring Issue: Oil in the Compartment
Besides giving off heat, rotary vane pumps often cause oil to get into the compartment of analytical instruments. One possible cause is oil leakage at the output. The presence of an oil mist filter is assumed. Integrating an oil return system into an oil mist filter increases the system's longevity by preventing prolonged periods of inadequate lubrication. An oil mist filter with an integrated oil return system is advised for dry operations. It is especially useful when working with built-in rotary vane pumps when the oil sight glass is not easily accessible. However, this does not absolve the operator from checking the oil level and inspecting the oil mist filter's filter element regularly.
Another possible source of oil buildup is a leaking pump. There are still several modern rotary vane pumps that utilize antiquated compressed cork seals for the oil reservoir. But it is better to use rotary vane pumps with guided O-ring seals instead.
The pump motor's shaft seal to the suction chamber is another possible leak point. Most oil leaks in rotary vane pumps may be traced back to a faulty shaft seal. Particles may shatter the shaft seal, for instance. It is possible to produce particles inside the pump itself, in addition to having them introduced by external processes. Attrition might occur due to loose connections at the couplings that connect the various pumping stages. The produced particles might then accumulate on the shaft or shaft sleeve, crushing or wearing down the seal. The shaft seal hardens less when the pump is run at lower temperatures.
A-VAC Industries cares about our clients' applications and performance so we provide specialized equipment to avoid these issues, like the DuoLine by Pfeiffer Vacuum.
The Pfeiffer Vacuum DuoLine is best for analytical systems because it eliminates temperature issues caused by the rotary vane pump's thermal output. When compared to other pump types, the airflow throughout this series is much better because of an optimized motor Lange design and an enhanced device base.
Due to the new DuoLine pumps' low operating temperature and lack of coupling steps, the shaft seal lasts much longer between servicing. By including magnetic connections in the initial design phase, shaft seals are eliminated. Long-term leak tightness is best achieved with rotary vane pumps like those found in the DUO M series since there are no spinning shafts protruding from the pump block.
We offer multiple vacuum pumps from the Pfeiffer DuoLine. You can count on A-Vac to help you choose the vacuum solution that best fits your needs. Contact us for more information!