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Screw vacuum pumps

Our products Operating principle
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Types of dry screw vacuum pumps

COBRA Industry dry screw vacuum pumps are ideally suited for industrial applications requiring reliable and contaminant-free extraction of gases and vapors.

Looking for a dry screw vacuum pump for demanding processes, such as coating or semiconductor manufacturing? Explore COBRA Semicon from Pfeiffer Vacuum+Fab Solutions (member of the Busch Group).

Product series
Nominal pumping speed
COBRA NX
350 m³/h - 950 m³/h
COBRA NC
110 m³/h – 2,500 m³/h
COBRA NS
70 m³/h - 600 m³/h
COBRA NF
750 m³/h - 950 m³/h
COBRA DX PLUS
650 m³/h - 1,900 m³/h
COBRA DS
70 m³/h - 1,640 m³/h
COBRA DH
2,700 m³/h - 6,200 m³/h
COBRA BA
85 m³/h - 105 m³/h

High-performance and robust vacuum generation for industrial applications

COBRA Industry

Applications

Dry screw vacuum pumps are used in a variety of industries. They are suitable for applications ranging from steel degassing to growing silicon crystals for solar panels.

Each industry and application has different needs. To find out which vacuum solution fits your needs best, get in touch with our Busch experts.

Find out more about how dry screw technology is used in different applications.

Your application is not mentioned? Check out our product finder!

Get your turnkey vacuum system with our COBRA vacuum pumps now!

vacuum_systems_building
Tailored to your needs. Including installation of pipework and control units.

Vacuum systems building

Our customer success stories

  • Busch Unveils the World’s Largest Dry and Air-Cooled Vacuum Pump: COBRA NC 2500 C

    Busch Unveils the World’s Largest Dry and Air-Cooled Vacuum Pump: COBRA NC 2500 C

    Busch Vacuum Solutions proudly announces the market launch of the air-cooled version of the COBRA NC 2500 C dry screw vacuum pump, the world’s largest dry and air-cooled vacuum pump.

    Learn more
  • Busch Vacuum Solutions Launches COBRA DH Series for Industrial Vacuum Applications

    Busch Vacuum Solutions Launches COBRA DH Series for Industrial Vacuum Applications

    Busch Vacuum Solutions introduces the COBRA DH series, a new generation of high-performance dry screw vacuum pumps specially designed for demanding industrial applications.

    Learn more
  • From Wind Tunnels to Space: Vacuum for Aerospace Research

    From Wind Tunnels to Space: Vacuum for Aerospace Research

    German Aerospace Center (DLR)

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  • Glass Coating Under Vacuum

    Glass Coating Under Vacuum

    Pumps and boosters from Busch Vacuum Solutions are used for the coating of low-E glass (low-emissivity glass) under vacuum.

    Learn more
  • Saving Energy with Sustainable Vacuum Solutions

    Saving Energy with Sustainable Vacuum Solutions

    Busch Vacuum Solutions has now launched the first vacuum pump of the new DX series on the market, the COBRA DX 0650/0950 A. It is a dry vacuum pump with state-of-the-art screw vacuum technology for excellent running characteristics, high vapor and particle tolerance, and extremely energy-efficient operation.

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  • High-Quality Bricks Thanks to State-of-the-Art Vacuum Technology

    High-Quality Bricks Thanks to State-of-the-Art Vacuum Technology

    Wienerberger GmbH

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  • Central Vacuum Supply Brings 50% Energy Savings in Rotor Blade Production

    Central Vacuum Supply Brings 50% Energy Savings in Rotor Blade Production

    Groß-Rotorblattfertigung GmbH

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  • Reliable Degassing at the Extrusion Press with Dry Vacuum Technology

    Reliable Degassing at the Extrusion Press with Dry Vacuum Technology

    Dachziegelwerke Nelskamp GmbH

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  • Pre-cooling lettuces reliably, thanks to cutting-edge vacuum technology

    Pre-cooling lettuces reliably, thanks to cutting-edge vacuum technology

    Heekeren GbR

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  • Screw Vacuum Pump for Arc PVD Coating

    Screw Vacuum Pump for Arc PVD Coating

    Dreistegen

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  • The Role of Vacuum Technology in Freeze Drying

    The Role of Vacuum Technology in Freeze Drying

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  • Dry Vacuum Technology for Chemical and Pharmaceutical Processes

    Dry Vacuum Technology for Chemical and Pharmaceutical Processes

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  • Latest Screw Vacuum Technology Lends Exceptional Reliability to ALD Coating

    Latest Screw Vacuum Technology Lends Exceptional Reliability to ALD Coating

    Inficon AG

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  • High-Quality Essential Oils and Essences Thanks to Vacuum Distillation

    High-Quality Essential Oils and Essences Thanks to Vacuum Distillation

    Learn more
  • Creating High Quality Surface Properties Through Fluorination with Reliable Vacuum Technology

    Creating High Quality Surface Properties Through Fluorination with Reliable Vacuum Technology

    Fluor Technik System GmbH

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  • Reducing Operating Costs by 40% in Wafer Handling with the Latest Vacuum Technology from Busch

    Reducing Operating Costs by 40% in Wafer Handling with the Latest Vacuum Technology from Busch

    IHP GmbH

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  • Vacuum for Cleaning and Drying Industrial Parts

    Vacuum for Cleaning and Drying Industrial Parts

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  • Leading the Trend Towards Individual Vacuum Solutions

    Leading the Trend Towards Individual Vacuum Solutions

    Vacuum Systems

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Self-adjusting cooling

Temperature independently balanced. The air condition for the pump. We invented it for you.

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FAQ

What is a dry screw vacuum pump?

A dry screw vacuum pump is a positive displacement pump that operates without oil. Two screw rotors rotate in opposite directions inside a cylindrical housing. The pumped medium enters via the inlet and is trapped and transported in chambers formed between the cylinder and the twin screws. Due to the rotation of the screws, the pumped medium is compressed and expelled via the outlet. No lubricants or operating fluids are required in the compression chamber. The minimal clearance between the screw rotors and the housing optimizes the internal seal.

The oil-free operation makes dry screw vacuum pumps ideal for applications requiring clean vacuum environments. They are used for various applications in industries ranging from lithium-ion battery production to vapor recovery.

How does a dry screw vacuum pump work?

Dry screw technology ensures high-performance and robust vacuum generation for industrial applications.

Inside dry screw vacuum pumps, two screw rotors rotate in opposite directions. The pumped medium is trapped between the cylinder and the screw chambers.

There, it is compressed and transported to the outlet. During this process, the screw rotors do not come in contact with each other or the cylinder.

Cooling is achieved through air or water cooling.

  • Illustration of screw technology

    Illustration of screw technology

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    Illustration of screw technology

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Vacuum generation in dry screw vacuum pumps explained in three steps

1. Inlet

  • The pumped medium enters via the inlet.
  • Two screw rotors rotate in opposite directions inside the cylindrical housing.

2. Compression

  • The pumped medium is trapped and transported in chambers formed between the cylinder and the twin screws.
  • The chamber size continuously decreases, and the pumped medium is compressed.
  • During the compression process, the screw rotors do not come in contact with each other or the housing.

3. Outlet

  • After compression, the pumped medium is expelled through the outlet.
  • The use of a twin screw design ensures the shortest possible gas path between the pump inlet and outlet, resulting in a fast compression process and quicker cycle times.

  • 3d_animation_screw_inlet

    Inlet

  • 3d_animation_screw_compression

    Compression

  • 3d_animation_screw_outlet

    Outlet

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    Inlet

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    Compression

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    Outlet

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Are dry screw vacuum pumps positive displacement pumps?

Yes, they are. A positive displacement pump is used to move and compress gas or air by repeatedly trapping a fixed volume of the pumped medium and moving it mechanically through a system. It maintains a constant flow and speed regardless of changes in pressure.

What are the differences between an oil-sealed screw vacuum pump and a dry screw vacuum pump?

In principle, oil-sealed screw vacuum pumps are just compressors that run the other way around. Therefore, they are not actual vacuum pumps but rather converted compressors.

What are the advantages and disadvantages of dry screw vacuum pumps?

Dry screw vacuum pumps from Busch are perfectly suited for demanding processes. They have several benefits:

  • Advanced screw design
  • Dry and contact-free operating principle
  • Highly energy-efficient
  • Low noise level
  • Compact dimensions

Vacuum pumps with this technology can be used for a large variety of applications, from chemical and pharmaceutical industries to packaging. However, they are not suitable for highly corrosive applications that require special alloys and coatings for housing and rotors.

How do I select the appropriate dry screw vacuum pump?

Several factors have to be considered when selecting the right vacuum solution. These factors vary depending on the application and the specific needs of your process.

Use our product finder to find your ideal vacuum pump. Or contact us to find out which vacuum solution fits your needs best. Our Busch experts are happy to help!

What makes Busch one of the leading manufacturers of dry screw vacuum pumps?

Busch has been improving dry screw vacuum technology for the past 30 years. With their patented self-balancing and self-draining screws, the dry screw vacuum pumps of the COBRA series set new standards in terms of efficiency. The design eliminates any risk of liquid accumulation inside the housing.

We offer different series types of dry screw vacuum pumps that enable us to provide the best solution for every application.