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HIGH-PERFORMANCE POLYMERS FOR FLUID TECHNOLOGY

08-01-2020
by 
in 

Lubrication- and maintenance-free igus plain bearing technology is proving popular in fluid engineering applications.

The range of applications of iglidur plain bearings and drylin linear guides and lead screws is growing constantly, and when used in the moving parts of pumps and drives, these plain bearings and linear bearings can be used without lubricant.

The iglidur products have proven particularly successful in pumps, valves, fittings and lifting systems. The drylin thread technology is also used in fittings with rotary knobs and vertical pumping movements.

And as aggressive media are no problem for these chemical-resistant materials, plain bearings and piston rings made of iglidur and dryspin lead screw nuts are frequently used in fluid technology.

In fluid technology drives are moved by the effects of pressure on liquids or gases. This mechanism is mainly used in pumps where the flow of fluids serves to drive the mechanism.

Whether in the rotor bearings of wet-running pumps or as knife-edge rollers in peristaltic pumps, iglidur plain bearings can be used on a large number of moving parts.

Conventional solutions made of metal require complicated seals, so that the lubricant does not get into the medium being conveyed. The use of iglidur plain bearings eliminates this risk.

Piston rings in fittings and valves

To move the fluids and gases used in fluid technology, the flow through the valves is typically controlled using diaphragms or pistons. Here, iglidur clip-on piston rings ensure that the piston can move linearly without any lubrication.

For example, the cost-effective igus piston rings from Treotham are used to replace elaborately processed PTFE tapes with just one guide ring, which is simply clipped into place.

The ability to get rid of lubricants is particularly an advantage in medical technology and in the beverage industry. These applications would typically use specialised lubricants, and the regular cleaning cycles necessitate a regular relubrication of conventional solutions.

Chemical and wear resistance in pumps

iglidur is used in piston or rotary pumps where pistons as well as gears or screws are used for displacement. The iglidur plain bearings meet the special bearing requirements of these devices. They enable very high precision and are also designed for high speeds and loads. In addition, they are suitable for tumbling loads caused by the pumping motion.

In peristaltic pumps, where the medium is forced through the housing with rotating rollers, iglidur knife-edge rollers are used, which are maintenance-free and wear-resistant.

While the plain bearings usually do not come into contact with the medium in displacement pumps, they do so in flow pumps. A flow is generated by a rotating impeller, which drives the fluid. Depending on the design of the pump, the motor and shaft also run completely in the medium, which lubricates and cools the bearing. In this way higher speeds and a longer service life can be achieved.

Such wet-running pumps can be found, for example, in the water cooling of vehicles. Due to their high resistance to media and chemicals, iglidur plastics are suitable for use directly in the fluid medium.

Vibration-free pumping

Vertical pumping movements must be performed as precisely and reliably as possible. Lead screws and matching lead screw nuts enable smooth running vertical pumping motions. In addition to the conventional drylin lead screws, igus dryspin technology is also used.

The flank angle of the dryspin lead screws is flatter than that of standard high helix lead screws. As a result, the force is converted more efficiently into a translational movement. This results in a comparatively high degree of efficiency and a longer service life.

In addition, the radius tooth design reduces the contact surface between the lead screw nut and the lead screw. This is why dryspin lead screw nuts are vibration-free and virtually silent.

Materials for every application

High pressure loads in pumping systems and the properties of the media can create special material requirements. These can include extreme pv values, which occur when the pump operates without the medium to be pumped, and additional influences such as high temperatures or cleaning agents.

Mineral oils are usually used to generate flow energy in hydraulics applications, and iglidur materials are ideal, with their comprehensive resistance to media and chemicals. These include the all-rounder iglidur G, the endurance runner iglidur J, or iglidur X as a specialist for high temperatures and chemical resistance.

Otherwise, iglidur H1 and iglidur H370, for example, are excellent for high media resistance, while iglidur A181 and iglidur A500 are usually used in the food industry.

Treotham Automation
1300 65 75 64
www.treotham.com.au

 

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