VACUUM SCIENCE BLOG

Entries related to: vacuum-pumps

Vacuum applications in times of COVID-19 & other pandemics

Given the situation with COVID-19, many questions are being asked about how vacuum technology (specifically mass spectrometers) can help with health diagnostics and research.

With this in mind, in this short blog we’ll explore how mass spectrometers can be used in the medical field to tackle pandemics like COVID-19.

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Everything you need to know about oil diffusion pumps

Oil diffusion pumps have been the workhorse in high-vacuum pumping for many decades and remain the standard for industrial applications like brazing/soldering, E-Beam welding and large-area coating. Their investment costs are relatively low, and they can provide pumping speeds of up to 50.000 l/s. In this blog, we will explain the working principles of oil diffusion pumps, including how to apply and control them in vacuum systems, the typical dos and don'ts, and provide several application examples.

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Vacuum Technology for Space Simulation Chambers

 

According to the Union of Concerned Scientists (UCSUSA) about 2,200 active satellites orbit our planet and an additional 100 are launched every year. Most of these satellites are used for telecommunication and, with GPS projects like the European GALILEO and the SPACE-X Starlink (which intends to bring internet connection to every spot on earth) on the horizon, their number will continue to grow.

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Matching primary and secondary pumps

Secondary pumps require a primary pump to initially ‘prime’ them for operation and/or to support their continuous operation. There are several factors which need to be considered for the correct combination or ‘matching’ of primary and secondary pumps to ensure safe and optimized performance.

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66th American Vacuum Symposium Report

 

The Annual Symposium of the American Vacuum Society is the world’s main yearly vacuum conference held in Columbus, Ohio from the 20th to 25th October 2019.

There were 27 parallel sessions in a wide range of topics and over 2500 registrants.

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How cryopumps work: a detailed guide on their use

 

Cryopumps offer several advantages compared to other high-vacuum pumps. For instance, their pumping speed for water vapour is up to 4x higher than any other vacuum pump with the same inlet diameter. Furthermore, unlike gas transfer pumps, i.e. turbomolecular pumps or oil diffusion pumps, cryopumps condense all the gasses within them. The goal of this blog is to explain to you how they operate and where their capabilities are beneficial to the vacuum process. 

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10th Vacuum Symposium 2019 Report

Over the years, vacuum pumps have evolved to dry versions (no oil in the swept volume), robust, process specific, low power consumption and reduced footprint. With this shift in the industry, it was great to hear a range of discussions around this during the 10th Vacuum Symposium UK.

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Everything you need to know about screw pumps

Screw pumps belong to the family of dry compressing gas transfer pumps. (Learn more about the origins of dry pumps here) They are positive-displacement pumps that use two screw shaped intermeshing rotors to move gas along the screw’s axis. They are frequently used in industrial vacuum applications, often in combination with roots blowers and as oil-free roughing pumps in high and ultrahigh vacuum systems.

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Vacuum bake out: its importance and implementation

The presence of gaseous molecules, whether slow or fast moving, is what gives rise to pressure. A vacuum is created by reducing the number of molecules that exist within, for example, a chamber or a flask. However, by reducing the number of molecules that exert a pressure on the internal surface of such a chamber, one reduces the pressure. Unfortunately, this causes “additional” molecules to enter into play.

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The importance of gas ballast for vacuum pumps

When atmospheric air (or a gas) is used as a source for a vacuum system, it will however “pure” it may appear to be invariably contain some vapour. As the pressure drops this vapour will condense out and unless vented from the system form a contaminant which will prevent the pump from achieving its optimum vacuum pressure. In addition, this condensate can enter the pump’s oil-seal where as a contaminant, it can have a further detrimental effect.

In simple terms, a gas ballast valve incorporated into the system will allow a small portion of the compressed gas (containing this detrimental condensate) to be expelled without impacting upon the overall performance of the pump.

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