Determination of groove size of rubber O type sealing ring
Taiwan Asahi Meike seal (XOK), professional and technical skills. If you encounter problems in the actual work on Slotting problems, you can communicate directly with us. The following brief introduction of slotting related content.
To determine the O type ring groove size is the main content in the design of the seal; when the O-ring size is selected, the amount of compression, stretching and working conditions are decided by a trench, it is no exaggeration to say that the design and selection of groove on the seal sealing performance and service life of the impact is very large. At present, the most commonly used groove shape is rectangle. For example, has been selected the O ring diameter of 3.53mm, then how to choose the groove size? First of all, we need to determine whether the seal is static or dynamic. If static, it is suggested that the groove width is 4.5 mm and the groove depth is 2.7mm. If it is dynamic and liquid is used as the medium, it is suggested that the groove width is 4.2 mm and the groove depth is 3.1mm; if the gas is used as the medium, it is suggested that the groove width is 4.2 mm and the groove depth is 3.25mm. So, the above size is selected, is it done? Of course not. There are a little more important, is in motion to prevent damage and O-ring in the slot a chamfer, above the corresponding chamfer is recommended for 1.8.
Stretch and compression of two and O rings
Tension and compression are two basic forms of O rings installed in grooves. The magnitude of compression force is determined by the initial deformation degree of O ring and the hardness of the sealing material. Taiwan Asahi seal (XOK), 100% grams of imported rubber material, from the fundamental guarantee for the various parameters of sealing products, including good tensile and compression index. When the rubber ring is used as an internal seal, its maximum perimeter compression is 1%. If it exceeds this level, the service life of the rubber ring will be affected. As an outer circle seal, its inner diameter should be greater than the outer diameter of the groove, and the maximum elongation should be 3% (inner diameter > 50mm) or 5%. If the pressure comes from the inside, the outer diameter of the seal ring should be in contact with the outer diameter of the groove (its perimeter compression is less than 1%). If the pressure comes from the outer side, the inner diameter of the rubber ring should be in contact with the inner diameter of the groove, and the maximum allowable tension is 3%.
Three, how to choose the O-ring
O ring is standard, currently on the market can offer businesses is very much, but the product quality is uneven, can really meet their needs, cost-effective but not many. Select the O-ring, suggestions from the following aspects:
Clear use environment: seal state is static or dynamic; long-term use temperature and limit temperature; whether to require high pressure, pressure, so as to choose the hardness of the sealing ring; is the gas medium or liquid medium?.
In addition to the basic content above, seal material is a very important aspect in the choice of o-ring. Because the quality of the material directly affects the performance requirements of the product.
Is the tightness, resilience and compressibility of 1/ material good?;
Is the price of 2/ moderate and easy to shape?;
3/ anti-aging ability is strong, long life?;
Is the wear resistance of 4/ good and the friction is small?;
5/ does not expand or expand in a particular medium (acid, alkali, water, steam, oil, etc.)?;
6/ does not appear to soften or decompose at high temperature, and does not harden or crack at low temperature