Rubber O-ring is a commonly used rubber product, it is […]
Rubber O-ring is a commonly used rubber product, it is widely used, the production process is also very simple, and the use of more raw materials. Most of the reasons for the destruction of O-rings do not come from the overall planning of the rubber O-rings or the working pressure. If the overall planning of a good overall plan only unilaterally expand the working pressure, it will not cause damage to the O-rings. , The basic 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. Rubber O-ring is a very typical actual 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 actual sealing effect will be caused. Cause a leak. So what are the factors that cause the rubber O-ring to deform?
1. The amount of contraction and the amount of stretch are indispensable factors.
Because the composition of rubber O-rings is different, the shrinkage and tension of rubber O-rings manufactured by different companies are also different. Under the condition of long-term contraction, the product can cause the imagination of stress relaxation of contraction. This kind of condition will expand slowly from time to time. The longer the time, the smaller the contraction amount and the amount of stretching, so that it will stretch. The lack of sex causes leakage, and the immediate way to change it is to add the cross-section limit of the product, but it will also lead to the expansion of the structural characteristics of the product.
2. Temperature is a very critical factor.
Temperature is very important for the degree of tension of rubber O-rings. No matter what kind of rubber raw material, it will accelerate its aging rate under continuous high temperature. When the temperature in the conditions is higher, the deformation of gas shrinkage will be greater. When the deformation of the product exceeds 40%, the o-ring will gradually lose its ductility and cause leakage. When the rubber O-ring is installed, the original ground stress will appear. This kind of long-term relaxation of the sleeping ring and the gradual decrease in temperature will gradually subside. In some cases, it is likely to follow the large increase in temperature. Decrease and subside, even if the rubber raw material is resistant to low temperatures, it will not exceed 25% of the ground stress caused at 20 degrees. Therefore, when installing the rubber O-ring, set the original ground stress and take the office environment into consideration. Factors in the temperature.
Rubber seal ring manufacturer
3. Material pressure is the prime culprit of the rubber O-ring deformation.
Compared with the above two factors, the working pressure of the material is more harmful to the deformation of rubber O-rings. It is a common situation that causes the deformation of rubber O-rings in working conditions. Following the development trend of intelligent hydraulic presses, hydraulic presses The working pressure of the material is getting higher and higher. The rubber O-ring will cause the O-ring to deform in such a high-pressure working environment for a long time. This kind of deformation is irreversible, so it is necessary to use different pressures for different pressures. For the same raw material, choose relatively compression-resistant rubber raw materials. Correspondingly, in order to solve the higher pressure, the hardness of the rubber ring of the compression-resistant raw material will also increase.
For rubber O-rings, the deformation means that the sealing performance 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, resulting in assets and even personal safety. Casualties. How can we prevent the O-ring from deforming?
First of all, it is necessary to do a good job in the purchase of rubber O-rings. Its friction resistance should be low, and the smoothness should be timely. The surface should be smooth and not smooth. There must be dirt. In the installation process, it is necessary to ensure the coaxial linearity used in the installation, and the deviation should not be too large. At the same time, it is also necessary to ensure the rationalization of the sealing system, and the limit deviation should not occur.