Rotary Joints for Air manufacturer

Rotary Joints for Air: A Comprehensive Guide

In the world of industrial machinery and equipment, the efficient transfer of air often plays a crucial role. Rotary joints for air come into play right here. Rotary unions, also known as swivels or rotary joints. They are mechanical devices that enable us to transfer air (and in some cases, other fluids or media as well) between a stationary and a rotating part of a machine. In this blog post, we will explore in detail various aspects of rotary unions for air, including their working principles, applications, different types available in the market, and the way to select the appropriate one for your specific needs.

Working Principles of Rotary Unions for Air

We design Rotary Joints for Air to provide a leak-free connection for transferring air between a stationary supply source and a rotating component. The basic working principle involves a set of seals and bearings. The seals prevent air leakage, ensuring that we direct the air precisely to where it is needed in the rotating part of the machinery. We use different types of seals, such as mechanical seals, o-rings, and lip seals, each having its advantages depending on the operating conditions.

Bearings, on the other hand, support the rotating part of the union, allowing it to turn smoothly. They help to reduce friction and wear, which is essential for the long-term performance and reliability of the rotary union. In some advanced designs, we use self-aligning bearings to accommodate any misalignment between the stationary and rotating parts, further enhancing the union’s efficiency.

Applications of Rotary Joints for Air

Pneumatic Conveying Systems

In industries like food processing, pharmaceuticals, and bulk material handling, we widely use pneumatic conveying systems to transport powders, granules, and other materials. Rotary unions for airplay a vital role in these systems, enabling the transfer of air to drive the movement of materials through pipes. For example, in a food processing plant, a rotary union supplies air to a rotating conveyor belt that moves food products from one stage of production to another. This ensures a continuous and efficient flow of materials without any air leakage, which could otherwise disrupt the conveying process.

Air-Operated Tools and Machinery

Many industrial tools and machinery rely on air as a power source. We use rotary unions to supply air to rotating components in these devices. For instance, in a high-speed air-driven grinder, the rotary union provides a constant supply of air to the rotating grinding wheel. This allows the grinder to operate at high speeds with precision, as a stable air supply is crucial for the performance of the tool. Similarly, in air-operated drills, compressors, and pneumatic actuators, we use rotary unions to ensure that air reaches the rotating parts smoothly, enabling them to function effectively.

Packaging Machinery

In the packaging industry, we use Rotary Joints for Air in various types of packaging machines. For example, in a rotary filling machine that fills bottles with liquid products, we use air to control the filling process. Rotary unions supply air to the rotating components of the machine, such as the filling valves and the indexing mechanism. This enables the accurate and efficient filling of bottles, ensuring that the packaging process is fast and reliable. In addition, in packaging machinery that uses air-powered seals or clamping devices, rotary unions provide the necessary air supply to these components, which are often part of the rotating assembly of the machine.

Automotive Manufacturing

Automotive manufacturing plants use a wide range of machinery and equipment that require the transfer of air. We use rotary unions in robotic arms, which are an integral part of the automotive production line. These robotic arms perform tasks such as welding, painting, and assembly. The rotary unions supply air to the rotating joints of the robot, which allows them to move with precision and flexibility. In addition, in automotive testing equipment, such as wheel balancers and engine test stands. We use rotary unions to transfer air to rotating components, ensuring the proper functioning of these testing devices.

Different Types of Rotary Joints for Air

Single-Channel Air Unions

Single-channel air unions are the simplest form of rotary unions for air. We design them to transfer air through a single passage. People often use these unions in applications where a basic air supply is required for a rotating part. For example, in a small-scale air-operated fan, a single-channel air union can supply air to the rotating fan blades. Some single-channel air unions are self-supported, meaning we can install them without the need for additional support structures. They also come in different sizes, from small-diameter unions for low-volume air applications to larger ones for more substantial air requirements.

Multi-Channel Air Unions

As the name implies, we design multi-channel air unions to transfer air through multiple passages. This type of union is useful in applications where the rotating part of the machinery requires different air pressures or air-controlled functions. For instance, in a complex industrial machine that has multiple air-operated components on a rotating shaft, a multi-channel air union can supply air to each of these components independently. We design some multi-channel air unions with independent sealing for each channel to prevent cross-contamination between the different air supplies. This is crucial in applications where the air in each channel has a specific function or composition.

Low-Speed Air Unions

We optimize low-speed air unions for applications where the rotating part operates at relatively slow speeds. And we design these unions with seals and bearings that are suitable for lower rotational speeds. They often use compounded o-rings or specially designed seals to ensure a long-lasting and leak-free connection. People commonly use low-speed air unions in applications such as certain conveyor systems where the rotation speed is not very high, but a reliable air transfer is still necessary. They are also cost-effective solutions for applications that do not require high-speed performance.

High-Speed Air Unions

In contrast to low-speed air unions, we engineer high-speed air unions to handle high rotational speeds. These unions need seals and bearings that can withstand the increased centrifugal forces and frictional heat generated at high speeds. We often use high-performance materials, such as tungsten carbide, for seals in high-speed air unions to ensure smooth rotation and excellent seal wear resistance. We typically use them in applications like high-speed spindles in machine tools or high-speed air turbines, where the reliable transfer of air at high speeds is essential for the proper functioning of the equipment.

High-Pressure Air Unions

We design high-pressure air unions to transfer air at elevated pressures. And we build these unions with robust construction and high-quality seals to prevent air leakage under high-pressure conditions. We use them in applications such as air-powered hydraulic intensifiers, where high-pressure air generates even higher hydraulic pressures. In these types of applications, the integrity of the rotary union is critical, as any air leakage could lead to a loss of performance or even safety issues. High-pressure air unions often feature balanced mechanical seals, which help to extend the life of the union and reduce the need for frequent maintenance.

Popular Brands and Their Product Offerings

Deublin Company

Deublin is a well-known manufacturer of Rotary Joints for Air. They offer a wide range of products to suit different applications.

1005 Series:

This self-supported rotary union can serve various air-hydraulic applications. We design it with balanced mechanical seals, which significantly reduce seal wear, making it suitable for long-term use in demanding applications.

1102 Series:

The Deublin 1102 air rotating union is compact yet durable, making it ideal for applications like small air clutches. It uses carbon graphite to tool steel seals and has an oil port for relubrication in pneumatic applications, ensuring smooth operation and long service life.

1115 Series:

With its 3/8″ size, this rotary joints are perfect for small air applications. The compact design features seal materials that enhance the union’s service life, and it also has an oiler for relubrication.

1205 Series:

The 1/2″ Deublin rotary union in the 1205 series is a self-supported, monoflow design. It features lubricated-for-life bearings, which extend its life and reduce downtime and maintenance in air-related rotary union applications.

2200 Series:

Deublin designs unions in this series to handle any pneumatic applications that require continuous high speeds or high pressures. They build these unions with high-quality components to meet the demands of these challenging applications.

250 Series:

The single-passage rotary union in the 250 series is for transferring large volumes of air. The 3/4″ design features balanced mechanical seals to extend the life of the union and minimize unwanted maintenance.

355 Air Series:

We use this series to transfer large volumes of media, such as air, to a stationary source. It is designed to handle high-volume air transfer efficiently.

452 Series:

Deublin’s compact pneumatic design in the 452 series can be configured to fit custom applications, providing flexibility for users with unique requirements.

1300 Series:

The monoflow rotary unions in the 1300 series have more than twice the flow capacity of 1/4″ pneumatic and hydraulic unions, making them suitable for applications that require a high – flow rate of air.

17 Series:

People consider the 17 series the best solution for low-speed air rotary union applications. It offers specially designed seals and compounded o-rings to ensure a longer life. It is an economical yet reliable option.

21 Series:

For low-speed rotary union applications in pneumatic systems, the 21 series uses special sealing with a compounded o-ring to achieve a longer seal life.

AP Series:

The high-pressure and high-speed AP rotary union features balanced mechanical seals made with tungsten carbide, which enables smooth rotation and excellent seal wear resistance.

D Series:

The D series is a high-pressure swivel that can handle angular movement. People often use it in power-steering systems in earth-moving equipment, where reliable air transfer under high-pressure and angular conditions is necessary.

2117 Series:

Deublin’s unique tandem rotary union in the 2117 series combines two unions to prevent cross-contamination, with independent sealing in each. It is suitable for several different media combinations, including air.

1690 Series:

The Deu – -plex air rotary union in the 1690 series is designed with two 1/4″ channels for low-speed applications, providing a reliable solution for applications that require multiple air channels at low speeds.

1790 Series:

The 3/8″ rotary union in the 1790 series is ideal for small air applications. Its compact design features seal materials that enhance the union’s service life and an oiler for relubrication.

1379 Series:

We designed the 1379 rotary union with four independent passages, and it can operate with various types of media, including air. A vent in between passages eliminates cross-contamination of two types of media, making it suitable for applications like clamping and unclamping.

1479 Series:

The 1479 rotary union operates at a higher flow rate with various types of media, such as air. The design features widely spaced ball bearings to absorb large side loads and reduce wear, making it suitable for applications like workpieces or spindle cooling.

1890 Series:

The 1/2″ two-channel unions in the 1890 series for pneumatic applications allow for alternating pressure, providing versatility in air-related applications.

1500 Series:

Deublin’s Deu-plex rotating union in the 1500 series is a precision solution ideal for pneumatic clutch and brake applications. We should use the two-passage design only with the same media to extend the seal life.

1590 Series:

The Deublin Deu – plex air rotary union in the 1590 series, best suited for air clutches, is for continuous operation. It uses carbon graphite to ceramic seals to ensure a long service life.

2620 Series:

To prevent contamination among media, such as air, the two-channel union in the 2620 series features independent passages with balanced mechanical seals. The seals allow for maximum operation and an increased lifespan.

7000 Series:

Deublin’s dual-passage rotary union in the 7000 series is custom-designed for pneumatic, around-the-shaft applications, providing a tailored solution for specific installation requirements.

Other Notable Brands

Some other brands in the market also offer high – quality rotary unions for air. For example, Fluid – O – Tech manufactures rotary unions that are known for their reliability and performance. We use their products in a variety of industries, including printing, textile, and plastics. They offer different types of rotary unions, such as single – and multi-channel models, with options for different sizes and pressure ratings.

Another brand is Tuthill, which produces rotary unions. Their products are designed to meet the specific needs of various applications. We design them with advanced sealing technologies and high-quality materials to ensure long-term performance and durability. We use Tuthill’s rotary unions in industries such as oil and gas, mining, and power generation, where the transfer of air under harsh operating conditions is necessary.

Choosing the Right Rotary Joints for Air

Consider the Operating Parameters

The first step in choosing the right rotary union for air is to consider the operating parameters of your application. This includes factors such as air pressure, temperature, and rotational speed. If your application requires high-pressure air transfer, you should select a rotary union that has the appropriate rating for that specific pressure. Similarly, if the air temperature is high, you need to choose a union with seals and materials capable of withstanding the elevated temperature. The rotational speed also influences the choice of rotary union, as high-speed applications demand unions with specialized bearings and seals to handle the centrifugal forces.

Determine the Required Number of Channels

Based on your application, you need to figure out how many air transfer channels you require. If you only need to supply a single air source to a rotating part, a single – channel air union will suffice. However, if your application involves multiple air – controlled functions or different air pressures in the rotating part, you should opt for a multi – channel air union. Make sure to take into account any future expansion or changes in your application that might call for additional air channels.

Evaluate the Sealing and Bearing Technologies

The sealing and bearing technologies in a rotary union are crucial for its performance and reliability. Different types of seals, such as mechanical seals, o-rings, and lip seals, have distinct advantages and are suitable for different operating conditions. For example, we often use mechanical seals in high-pressure and high-speed applications, while o-rings are more common in lower-pressure and lower-speed scenarios. Similarly, when choosing bearings, such as ball bearings, roller bearings, or self-aligning bearings, you should base your decision on the load requirements and the potential degree of misalignment in your application.

Look for Compatibility with Your System

It is essential to make sure that the rotary union you choose is compatible with your existing system. This involves considering factors like the connection types (e.g., threaded, flanged), the size and dimensions of the union, and the materials used in its construction. The rotary union should integrate seamlessly with the stationary and rotating parts of your machinery, without causing any installation or compatibility problems.

Consider the Brand Reputation and After-Sales Support

It’s always a good idea to choose a rotary union from a reputable brand. Reputable brands are more likely to produce high-quality products that meet industry standards. Moreover, they often provide better after-sales support, such as technical assistance, spare parts availability, and warranty coverage. Before making a purchase, research the brand’s reputation in the market, read customer reviews, and consider the level of support they offer.

Maintenance and Troubleshooting of Rotary Unions for Air

Regular Maintenance

Regular maintenance is vital to ensure the long-term performance and reliability of rotary unions for air. This includes tasks like checking for air leaks, inspecting the seals and bearings for wear, and lubricating the moving parts. You can detect air leaks by using a soap-bubble solution or an electronic leak detector. If you find any leaks, you should replace the seals immediately. You should inspect the seals and bearings regularly for signs of wear, such as excessive play or damage to the seal faces. Follow the manufacturer’s recommendations and use the appropriate lubricant to lubricate the bearings and other moving parts.

Troubleshooting Common Issues

Air Leakage:

As mentioned before, air leakage is a common problem. If air leakage occurs, start by checking the seals. Worn-out or damaged seals are the most common cause of air leaks. If the seals are in good condition, check the connection points to make sure they are tightened properly. In some cases, a crack or damage in the body of the rotary union can also cause air leakage, and in such a situation, you may need to replace the union.

Excessive Vibration or Noise:

Excessive vibration or noise during the operation of the rotary union may indicate a problem with the bearings. Check the bearings for signs of wear, like pitting or roughness. If the bearings are worn, you should replace them. Uneven airflow or pressure fluctuations can also lead to vibration and noise. In such cases, check the air supply system to ensure that the air pressure is stable and the airflow is smooth. Reduced Performance:

If the equipment using the rotary union for air shows reduced performance, there could be several reasons. A clogged air passage in the rotary union may restrict the airflow, resulting in reduced performance. Check for any debris or contaminants in the air passages and clean them if needed. Additionally, worn-out seals or bearings can also cause a decrease in performance, as they may allow air leakage or increase friction.

FAQ

Q1: What’s the ideal maintenance schedule for air rotary unions?

A: Daily leak checks, monthly lubrication (if needed), and annual seal/bearing replacements ensure longevity.

Q2: Can air rotary unions work in explosive environments?

A: Yes, ATEX-certified models with stainless steel/anti-static parts safely handle hazardous zones.

Q3: How do I troubleshoot low air pressure?

A: Check for clogged filters, misaligned seals, or worn bearings—common causes of pressure drops.

conclusion

Rotary unions for air are essential components in many industrial applications. Understanding their working principles, applications, different types, and how to choose and maintain them. It is crucial for ensuring the efficient and reliable operation of machinery and equipment. By carefully considering the factors discussed in this blog post. You can select the right rotary union for your specific air-transfer needs and keep it in good working condition for a long time.