Breaking News
December 12, 2018 - Sprayable gel could help prevent recurrences of cancer after surgery
December 12, 2018 - How do patients want to discuss symptoms with clinicians?
December 12, 2018 - Zinc chelation may be able to deliver drug to insulin-producing cells
December 12, 2018 - Brigham researchers develop automated, low-cost tool to predict a woman’s ovulation
December 12, 2018 - Some people with Type 2 diabetes may be testing their blood sugar more often than needed
December 12, 2018 - Slow-growing type of glioma may be vulnerable to immunotherapy, suggests study
December 12, 2018 - Study provides new information regarding microRNA function in cellular homeostasis of zebrafish
December 12, 2018 - Study provides new understanding of mysterious ‘hereditary swelling’
December 12, 2018 - Researchers shed new light on how to combat Shiga and ricin toxins
December 12, 2018 - Pregnant Women Commonly Refuse Vaccines
December 12, 2018 - Drug treatment could offer new hope for some patients with brain bleeding
December 12, 2018 - Health care financial burden of animal-related injuries is growing, study says
December 12, 2018 - Macrophage cells could help repair the heart following a heart attack, study finds
December 12, 2018 - Researchers develop new system for efficiently producing human norovirus
December 12, 2018 - New artificial intelligence-based system to differentiate between different types of cancer cells
December 11, 2018 - Brazilian professors propose guidelines for therapeutic use of melatonin
December 11, 2018 - Healthy Lifestyle Lowers Odds of Breast Cancer’s Return
December 11, 2018 - New research identifies two genes linked to serious congenital heart condition
December 11, 2018 - NIH Director talks science, STEM careers with preteens
December 11, 2018 - Disabling a Cellular Antivirus System Could Improve Gene Therapy
December 11, 2018 - New tool swiftly provides accurate measure of patients’ cognitive difficulties
December 11, 2018 - NICE releases new guidelines for diagnosis and management of COPD
December 11, 2018 - Without Obamacare penalty, think it’ll be nice to drop your plan? Better think twice
December 11, 2018 - Researchers capture high-resolution X-ray and NMR image of key immune regulator
December 11, 2018 - Natural flavonoid is effective at treating leishmanisis infections, study shows
December 11, 2018 - Avoidant grievers unconsciously monitor and block mind-wandering contents, study shows
December 11, 2018 - Study identifies how hantaviruses infect lung cells
December 11, 2018 - Improving PTSD care through genetics
December 11, 2018 - Dermatology providers show interest in recommending cannabinoids to patients
December 11, 2018 - Researchers to study effects of electroconvulsive therapy on Alzheimer’s patients with aggression
December 11, 2018 - Four dried fruits have lower glycemic index than starchy foods, study finds
December 11, 2018 - Optimization of drug dose sizes can reduce pharmaceutical wastage
December 11, 2018 - Ultrarestrictive opioid prescribing strategy linked with reduction in number of pills dispensed
December 11, 2018 - PET scans to optimize tuberculosis meningitis treatments and personalize care, study finds
December 11, 2018 - Researchers aim to identify and target high blood pressure indicators
December 11, 2018 - Researchers identify immune cell subset that may drive chronic inflammation
December 11, 2018 - Ezogabine treatment reduces motor neuron excitability in ALS patients, study shows
December 11, 2018 - One implant, two prices. It depends on who’s paying.
December 11, 2018 - Standardizing feeding practices improves growth trends for micro-preemies
December 11, 2018 - COPD Tied to Obesity in Male, Female Never-Smokers
December 11, 2018 - Flossing: Information for Caregivers
December 11, 2018 - Does breastfeeding hormone protect against type 2 diabetes?
December 11, 2018 - Educating future doctors to prescribe physical activity for their patients
December 11, 2018 - Krystal 2000 microplate design improves fluorescence and luminescence measurement
December 11, 2018 - FDA clears mobile medical app to help increase retention in recovery program for opioid use disorder
December 11, 2018 - Overcoming Challenges in High-Speed Centrifugation Experiments
December 11, 2018 - Study shows link between neighborhoods’ socioeconomic status and dietary choices
December 11, 2018 - Lower BMI before obesity surgery predicts greater post-operative weight loss, study finds
December 11, 2018 - Obesity May Be Driving Rise in Uterine Cancers
December 11, 2018 - Antioxidants may prevent cognitive impairment in diabetes
December 11, 2018 - Study discovers link between meditation and how individuals respond to feedback
December 11, 2018 - Researchers identify potential diagnostic tool for Alzheimer’s disease
December 11, 2018 - Oral cancer prognostic signature identified
December 11, 2018 - How Can I Find Out What Caused My Miscarriage?
December 11, 2018 - Novel personalized medicine tool for assessing inherited colorectal cancer syndrome risk developed
December 11, 2018 - Study uncovers 11 new genes associated with epilepsy
December 11, 2018 - Filling research gaps could help develop more disability-inclusive workplaces
December 11, 2018 - Cartilage tissue engineering brings good news for patients with cartilage defects
December 11, 2018 - Novel 3D printing workflow helps predict leaky heart valves
December 11, 2018 - Imagination can help overcome fear and anxiety-related disorders, shows study
December 11, 2018 - Are caries linked to political regime?
December 11, 2018 - Leader in Diabetes Clinical Trials Wins Naomi Berrie Award
December 11, 2018 - Scientists discover cellular mechanism that triggers pneumonia in humans
December 11, 2018 - Increasing mental health problems related to drug use in over 55’s
December 11, 2018 - High-intensity interval exercise could help combat cognitive dysfunction in obese people
December 11, 2018 - Annual flu shot can save lives of heart failure patients
December 11, 2018 - Researchers compare health outcomes for VA and non-VA hospitals
December 11, 2018 - Recommendations Developed for Psoriatic Arthritis Treatment
December 11, 2018 - Genetic analysis links obesity with diabetes, coronary artery disease
December 11, 2018 - Study shows that having genetic information can affect how the body responds
December 11, 2018 - UNAIDS Report: 9 Million Are Likely HIV Positive And Don't Know It
December 11, 2018 - Lund University researchers succeed in obtaining dendritic cells by direct reprogramming
December 11, 2018 - Breast tumors recruit bone marrow cells to boost their growth, study reveals
December 11, 2018 - Updated breast cancer screening guideline highlights importance of shared decision-making
December 11, 2018 - EHR-related stress associated with physician burnout
December 11, 2018 - AHA: 12-Year-Old Heart Defect Survivor Inspires NFL Player’s Foundation
December 11, 2018 - Breast cancer patients who take heart drug with trastuzumab have less heart damage
December 11, 2018 - Providing aid to those humans – and animals – affected by the California fires
December 11, 2018 - Even without proof, CBD is finding a niche as a cure-all
December 11, 2018 - Drawing leads to better memory than writing
New oil-free, dry compressing screw vacuum pump from Leybold

New oil-free, dry compressing screw vacuum pump from Leybold

image_pdfDownload PDFimage_print

The new VARODRY is a 100% oil-free, dry compressing screw vacuum pump. Screw pumps are currently state-of-the-art in the field of industrial vacuum pumps. The VARODRY will initially be available in the sizes VD65 (65 m³/h) and VD100 (100 m³/h), the sizes VD160 and VD200 are already in preparation.

What qualifies the pumps of the VARODRY series is their excellent suitability for the manufacturing industry. The reason: In industrial processes, pumps do not only need to handle clean air, but also dirt, particles, outgassing of media and vapors. Processes do also not always work stable, other disturbance factors might also be involved. The pump must be able to tolerate all of this. In general, screw pumps are the best choice for such demanding requirements. You can compare their function a bit to an extruder that pushes out the disturbing particles together with the regular material at its exhaust. In addition, these pumps are able to handle vapors in the best possible way. All those advantages of the screw-pump functional principle apply to the VARODRY, but next to this, due to its integrated silencer the pump offers also a quiet and pleasant sound profile.

However, there are other factors, which make a significant contribution to improving production processes. The variable inlet flange arrangement enables a flexible installation of the pump within the plant. Furthermore, the design of the silencer without “sponge-like” damper materials and the exhaust flange located at the lowest point of the pump facilitates pushing-out liquids or condensed vapors, which might incur in some industrial processes. This prevents potential formation of rust and contributes significantly to process reliability.

A further process advantage is the reliability and efficiency of the pump. It can be operated continuously at any inlet pressure and is fully resistant even against repeated shock venting. Any number of cycles can be run without overload, which is still not the current market standard.

A major differentiation of the VARODRY is its complete oil-freeness. All other screw-type vacuum pumps on the market are “dry compressing”; nevertheless, all these pumps have gear compartments partly filled with oil to lubricate the bearings and gear wheels.

Exactly this is not the case with the VARODRY pumps. The VARODRY is 100% oil-free. Because of this there is no chance for oil migration from the gear chamber into the pumps compression chamber where this oil might react with the pumped gases or in worst case even migrate backwards to the process chamber.

This hazard cannot happen with the VARODRY, as it uses grease-lubricated bearings and as even oil-lubricated synchronization gears are not used. Drive and synchronization is done with a high-tech tooth-belt, which on demand can be exchanged in a few minutes by the user himself. This also eliminates the gear oil exchanges which are still required at other screw-type pumps. It is therefore impossible that any oil can migrate backwards to the process chamber, will be blown out of the exhaust or might leak on the floor during gear-box exchange. The VARODRY is therefore the first pump on the market which is 100% oil-free which will have a significant impact on cost reduction and process room cleanliness.

Another technical advantage for industrial use is the complete air cooling of the pump. This simplifies the integration of the pump into the plant as there is no need for the sometimes complicated water supply.

In contrast to most competitor products, the VARODRY has a moderate temperature profile. The low internal temperatures which peak around 100 to 130°C (depending on operation point) also allow a handling of temperature sensitive media, often preventing that those react immediately and build-up layers inside the pump. This moderate heat is the optimum for many applications enabling long-time operation without need for compression room cleaning.

These properties qualify VARODRY for a number of applications:

Optical coatings such as spectacle lenses or decorative coatings, e.g. for bathroom fittings, usually produce dust in the sputtering process. A dry compressing screw-pump simply blows such dust through while in oil-sealed pumps the dust is trapped which causes strong wear of the motive parts.

The VARODRY is also a perfect pump for drying processes and industrial cleaning systems, e.g. for casted machine parts. Such parts must be dried thoroughly after cleaning to avoid immediate flash rust corrosion. The best method to dry such massive parts which have sometimes hidden solvent reservoirs inside bore-holes or cavities is vacuum drying. The moisture is extracted from even the smallest holes and the part is completely dried. This application requires pumps that can tolerate a lot of vapors – such as the VARODRY vacuum pumps.

The same prerequisite applies for successful cryo-pump regeneration. Cryo-pumps freeze the gases and require a regular regeneration, during which the pump is heated and the stored gas will be released and must be pumped out. Large quantities of water are appearing during this process.

In addition to drying processes in industrial cleaning systems, the VARODRY is also used in freeze drying application, as well in pharmaceutical as also in food-related freeze drying. Drying applications are also necessary in lithium-ion battery production and in the manufacture of power storage devices.

Another target market which involves vacuum drying is the manufacturing of transformers or other high-voltage transmission components. Such components contain insulation materials, i.e. paper windings, which must be absolutely dry. Under vacuum, the moisture in the insulation is reduced to a few ppm only. Water vapor compatibility is also important here.

In composite applications, the resin must be degassed prior to usage to ensure bubble-freeness. During the following infiltration step, the resin is then pulled into the pre-evacuated fiber material. In both process steps the resin is outgassing and vapors enter the pump which needs to tolerate this. In this application the VARODRY excels again with its moderate process room temperature, as the build-up of layers is widely prevented which ensures a long-time, trouble-free operation of the pumps.

Besides liquid, gaseous and solid, plasma is the fourth state of aggregation. Typical plasma applications are surface cleaning and activation or sterilization where bacteria are killed by the hot surface plasma without a real heat-load for heat-sensitive products. In plasma applications the pressure is typically reduced to <1 mbar, a reactive gas as O2 or H2O2 is introduced and then the plasma is ignited. The pumps need to handle the plasma-gases plus the “burnt” by-products. Using plasma, it is mostly complicated to define exactly the gases which need to be handled by the pump. A dry pump with its robustness is therefore ideal in these applications because it can convey nearly all substances without trouble.

With the attributes “easy”, “reliable”, “efficient” and “dry”, the VARODRY is a very good alternative to the usual pumps on the market.

Tagged with:

About author

Related Articles