What are the problems of rotary joints and how to deal with them?

ruisi
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Membru din: Mie 13 Apr, 2022 10:08 am

What are the problems of rotary joints and how to deal with them?

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Rotary joints are very common in our lives, but does anyone know what problems can occur in the use of rotary joints? Can you provide a good solution?

ruisi
Mesaje: 2
Membru din: Mie 13 Apr, 2022 10:08 am

Re: What are the problems of rotary joints and how to deal with them?

Mesaj de ruisi »

Introduction to Rotary Joints
The rotary joint is a connection sealing device that inputs the fluid medium from the static pipeline into the rotating or reciprocating equipment, and then discharges it from the rotary joint, referred to as the "rotary joint".

Rotary joint problem
If the fluid is mixed with foreign matter, impurities, and crystal precipitation, it will cause damage to the sealing surface of the rotary joint, and the appearance of scratches and grooves on the sealing surface will directly lead to leakage; similarly, if the inner support spring type is used, it is easy to cause the spring to corrode, Stuck. As a result, the rotary joint seal fails.

Due to dry friction and sudden interruption of cooling water at the seal, radial cracks will appear on the annular surface.

Graphite carbonization is one of the main causes of seal failure when using carbon-graphite rings. In use, if the graphite ring exceeds the allowable temperature, the resin will precipitate on its surface, and the resin near the friction surface will be carbonized, which will increase the leakage of the sealing surface and cause the sealing to fail.

Auxiliary seals (such as fluorine rubber, ethylene-propylene rubber, all rubber) will rapidly age, crack, harden and lose elasticity after exceeding the allowable temperature. The flexible graphite used now has good high-temperature resistance and corrosion resistance, but it is easy to be brittle and cracked, so be careful when installing it.

Defective sealing material or not designed to adapt to different media can cause leakage.

Other aspects include leakage caused by vibration of the outer tube, leakage caused by poor quality or looseness of transmission, tightening and thrust parts, leakage caused by mechanical seal auxiliary mechanism, and frequent leakage caused by medium problems.

Rotary joint solutions
The sealing surface of the rotary joint must have a certain specific pressure so that it can play a sealing role. This requires that the spring of the mechanical seal must have a certain amount of compression, giving a thrust to the sealing end surface, and rotating the sealing surface to produce the required sealing force. than pressure. In order to ensure this specific pressure, the rotary joint requires that the shaft cannot move too much, generally within 0.15mm. Otherwise, the outer tube will move greatly, and periodic or paroxysmal leakage will occur.

Pay attention to temperature problems when using auxiliary seals and graphite rings.

Choose good quality sealing material, and change the sealing material for different media when designing.
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