Introduction
As a popular type of slip ring, pneumatic slip rings can transmit various gases in rotating systems. But they also have specific limitations in gas transmission. As a leading slip ring manufacturer, ByTune will explore the types of gases suitable/unsuitable for pneumatic slip rings, influencing factors, and the solutions we provide in this article.
Suitable Gas Types for Pneumatic Slip Rings
Pneumatic slip rings are suitable for handling gases like:
Compressed Air
The most common medium for pneumatic slip rings. In most factory pneumatic control systems, it is a readily available and cost-effective power source. People transmit it to pneumatic actuators, such as cylinders and air motors, to drive the equipment to operate.
Inert Gases
Inert gases suitable for pneumatic slip rings include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and nitrogen (N₂). They are often used as protective gases and purge gases in industry.
Dry Process Gas
It refers to gases from which water vapour has been removed, or gases that naturally contain very little water, such as nitrogen and dry natural gas (which is primarily methane).
These gases are molecularly stable and non-corrosive. They do not react with the sealing material of the slip ring and do not cause excessive wear on the rotating interface.
Limited Gases of Hydraulic Slip Rings
1. Corrosive Gases
Ordinary pneumatic slip rings cannot transmit gases such as chlorine (Cl₂) and hydrogen chloride (HCl). These gases easily react chemically with metal seals and pipeline materials, causing corrosion and gas leakage.
2. High-humidity Gases
Refers to air with high water vapor concentration. Moist gases promote corrosion and freeze in low-temperature applications, damaging the slip ring.
3. Flammable/Explosive Gases
Includes gases like hydrogen (H₂) or methane (CH₄). During the conduction process, they can interfere with electrical contact, causing arcing, sparks, or corrosion.
4. High-temperature Gases
Generally, pneumatic slip rings can operate within the range of -20°C to 80°C. When the temperature of the transmitted gas exceeds this range, it will deform the slip ring sealing materials.
5. Toxic Gases
These gases typically originate from industrial processes or chemical reactions, such as carbon monoxide, hydrogen sulfide, and chlorine.
What Mainly Affects Their Transmission Capacity?
Channel Diameter and Quantity
If the slip ring's channels are too narrow, fluid flow resistance increases, reducing transmission efficiency. Conversely, overly large diameters may occupy excessive space, limiting the number of channels.
Material
The material of the slip ring affects its sealing performance, wear resistance, and corrosion resistance. Common metal housings (e.g., stainless steel, aluminum alloy) offer high strength but at a higher cost. Engineering plastics (e.g., PEEK) are lightweight and corrosion-resistant but have weaker pressure resistance.
Operating Pressure and Temperature
Changes in working pressure and temperature can cause material expansion or contraction. If slip ring components shrink excessively, leakage rates may increase, while overexpansion can lead to structural failure.
Gas Purity and Moisture Content
Contaminants in the gas (particles, oil, water vapor) can clog the slip ring's transmission channels, reducing efficiency. The ISO 8573-1 standard specifies compressed air purity levels (e.g., Class 1 requires particles ≤0.1μm and a dew point ≤-70°C).
Rotational Speed
Excessive rotational speed can cause dynamic seal failure or generate frictional heat. At speeds exceeding 5000 rpm, wear intensifies, necessitating alternative materials such as ceramics.
Machining Tolerances
Poor machining precision can result in uneven channel diameters and rough internal surfaces. This increases fluid resistance and creates dead zones where gas accumulates, reducing transmission efficiency.
How Can ByTune Customize the Pneumatic Slip Rings for You?
We provide pneumatic slip rings according to the parameters and working conditions you specify. The parameter range of the standard model is as follows:
• Electrical channels: 1 - 96
• Pneumatic/fluid channels: 1 - 16
• Working Pressure: within 35MPa
• Port size: 3 - 20mm
• Outer diameter: 56 - 108mm
• Housing material: plastic, aluminum, stainless steel
• Protection level: IP54 - IP68 (waterproof, dustproof, explosion - proof)
• Applicable gas types: compressed air, nitrogen, and special gases (such as argon)
• Installation methods: flange installation, sleeve installation, and other standards, as well as customized interface design
• .......
Conclusion
Understanding the gas transmission limitations of pneumatic slip rings helps keep the operation of the entire system safer. Standard models can transmit compressed air, dry air, and inert gases. However, when dealing with corrosive, high-pressure, or special gases, customized solutions are often the better choice.
ByTune - Professional Slip Ring Manufacturer
Is your rotating application facing gas transmission challenges? ByTune's engineering team can customize pneumatic slip ring solutions based on your specific gas type, pressure, and environmental conditions. Contact us now to discuss how to overcome your gas transmission limitations with reliable, high-performance rotational solutions - our experts are ready to collaborate with you.