Rubber O-ring is a commonly used rubber product. It is widely used, the production process is also very simple, and many raw materials are used.
Most of the damage of the O-ring is not from the overall design of the rubber O-ring or the working pressure. If the working pressure is only increased unilaterally in a good overall plan, the damage of the O-ring will not occur. The factor is because of the deformation of the O-ring seal under the ultra-high pressure and high temperature of the office environment and the bite generated when it is squeezed into the gap.
The rubber O-ring is a very typical sealing effect caused by deformation caused by kneading. It causes contact stress with the raised surface during installation. When the working pressure exceeds the burden of the sealing material, the sealing effect is caused. cause leakage.
So what is the reason for the deformation of the rubber O-ring?
1. The amount of tightening and the amount of tension are indispensable factors
Because the composition of rubber O-ring plastic pellets is different, the amount of compression and tension of rubber O-rings manufactured by different companies are also different.
Under the condition of long-term contraction, the commodity can cause the imagination of the stress relaxation of contraction. This kind of situation will follow the slow expansion from time to time. The longer the time is, the smaller the amount of contraction and tension will be, making it extend The lack of sexuality causes leakage, and the immediate change method is to increase the cross-sectional limit of the commodity, but it will also lead to the expansion of the structural characteristics of the commodity.
2. Temperature is a very important factor
Temperature is very important for the relaxation of rubber O-rings. No matter what kind of rubber raw material, it will accelerate its aging rate under continuous high temperature. When the deformation of the product exceeds 40%, the O-ring will gradually lose its ductility and work ability, resulting in leakage.
When the rubber O-ring is installed, the original ground stress will appear, which will gradually subside due to the long-term relaxation of the sealing ring and the gradual decrease in temperature. In some cases, it is likely to follow the large temperature increase Reduce and subside, even if the rubber raw material is resistant to low temperature, the ground stress caused by 20 degrees will not exceed 25%. Therefore, when installing the rubber O-ring, the original ground stress should be set, taking into account the office environment. the temperature factor.
3. Material pressure is the culprit of rubber O-ring deformation
Compared with the above two factors, the working pressure of the material is more harmful to the deformation of the rubber O-ring, which is a common situation in the working condition that causes the deformation of the rubber O-ring. The working pressure of the material is increasing, and the rubber O-ring will be deformed in such a high-pressure working environment for a long time, which is irreversible.
Therefore, different raw materials should be used for different pressures, and rubber raw materials that are relatively compressive should be selected. Correspondingly, in order to solve the higher pressure, the hardness of the rubber ring of the compressive raw materials will also increase accordingly.
For rubber O-rings, deformation means that the sealing cannot be guaranteed. Although it does not seem to be a big problem, it often causes leakage of the hydraulic press system. When it is not optimistic, it will cause equipment problems, assets and even personal safety. casualties. How can we prevent the deformation of the O-ring?
In the purchase of rubber O-rings, it is necessary to do a good job. Its frictional resistance should be low, and its smoothness should be timely. Its surface should be smooth and clean, and it must not be smooth and dirty. In the installation process, to ensure the coaxial linearity of the installation and use, it is necessary to ensure the rationalization of the sealing system, and the limit deviation cannot be too large.