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Analysis of several objective causes of O-ring failure

Release time:

2019-06-04 12:30

Source:

O-ringAnalysis and (I) of several objective causes of failure
 
The most common seals in the hydraulic system are O-ring, lip seal ring, combined seal, sealing belt, sealing gasket, rotating hole shaft seal ring, etc. Among them, O-ring is the most widely used in hydraulic system. Taking O-ring as an example and combining with practical application, several objective reasons for its failure are analyzed in detail. O-ring analysis of several objective factors analysis results such:
 
1. storage (daily storage) problem
1. The packaging of the seal is damaged, dust is attached to the seal, and the seal is scratched by others;
2. The user does not check the installation;
3. The seal section is damaged, affecting the sealing effect;
4. With wire, rope hanging seals will happen rubber deterioration and size changes;
5. In the sunlight or close to the heat source, the seal changes.
 
2. structural design problems
1. The compression rate is too large to cause premature wear of the seal;
2. The gap is too large and the seal is squeezed into the gap;
3. The sealing groove is too wide, the friction is large, and it is easy to heat up, causing the seal to crawl or damage;
4. seal groove is too narrow, because the jet seal wear;
5. The bonding surface is too rough, causing severe wear; 6. The pipe joint is inconsistent with the pressure and use conditions, and the seal leaks due to vibration or high pressure.
 
Analysis and (II) of several objective reasons for the failure of O-ring
 
The most common seals in the hydraulic system are O-ring, lip seal ring, combined seal, sealing belt, sealing gasket, rotating hole shaft seal ring, etc. Among them, O-ring is the most widely used in hydraulic system. Taking O-ring as an example and combining with practical application, several objective reasons for its failure are analyzed in detail. O-ring analysis of several objective factors analysis results are as follows:
 
Problems to be paid attention to during 1. installation:
1. The installation work is not appropriate, the use of sharp tools such as screwdriver, resulting in damage to the seal and premature failure;
2. The installation is not or the installation stroke is too long, the O-ring is twisted or leaked due to spiral fracture;
3. The sealing edge is twisted during installation, and the sealing element leaks when starting.
2. oil (such as hydraulic oil, etc.) pollution problem 1. Contaminated particles cause seal wear and cause leakage, and dust particles enter the guide through the scraper ring seal and cause functional damage; 2. Water in the oil causes hydraulic oil to hydrolyze (such as polyurethane); 3. Solid particles in the system cause seal grinding and wear.

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