First, the sealing principle of the sealing ring
The sealing principle of the sealing ring is mainly based on the following aspects:
Mechanical compression: During the sealing ring installation process, the sealing ring will be compressed, resulting in a sealing force. This force makes the sealing ring in close contact with the contact surface, preventing the leakage of the medium.
Elastic deformation: Seals are usually made of elastic material and are able to recover their original shape after compression. This elastic deformation helps to fill small irregularities in the contact surface, thus improving the sealing effect.
Material adaptability: Sealing ring materials such as rubber, polyurethane, silicone, etc., can play a role in a variety of environmental conditions, including high temperature, low temperature and chemical corrosion.
Two, sealing ring design
Designing an effective seal requires consideration of several factors:
Size: The size of the seal must match the mounting space. Its diameter and thickness should be selected according to actual needs to ensure that sufficient sealing force can be provided after compression.
Material selection: Select the appropriate material according to the use environment. For example, fluororubbers are suitable for high temperature environments, while EPDM is suitable for chemical corrosion resistance. The choice of material directly affects the performance and life of the sealing ring.
Shape: The common sealing ring shapes are round, square, double lips and so on. Different shapes are suitable for different sealing needs, and the design needs to choose the right shape according to the actual situation.
Surface treatment: The contact surface of the sealing ring needs to be properly treated to reduce friction and wear. This includes smoothing the seal to ensure a good fit with the contact surface.
Third, the sealing ring verification
Verifying the performance of the seal ring is a key step to ensure that it can work effectively. Common verification methods include:
Static seal test: In the absence of movement, check the sealing effect of the seal ring. This includes detecting the presence of liquid or gas leaks.
Dynamic seal test: Test the performance of the seal ring under actual operating conditions. This includes simulating vibration, pressure changes, etc. that may occur during the operation of the equipment to ensure that the seal can maintain an effective seal.
Life test: Test the durability of the seal by simulating its long-term use. This includes the evaluation of the wear resistance, aging and other properties of the sealing ring.
Fourth, the failure of the sealing ring
The failure of the seal ring may be caused by several factors:
Material aging: Due to environmental factors such as high temperature and ultraviolet radiation, the sealing ring material may age, resulting in a decline in its elasticity and sealing performance.
Mechanical damage: During installation or use, the sealing ring may suffer physical damage, such as cutting and scratching, which will lead to a decline in sealing performance.
Improper design: Improper selection of seal size, shape or material can lead to inadequate sealing performance, which can lead to leakage problems.
Excessive pressure or temperature: If the pressure or temperature in the working condition exceeds the design range of the seal, it may cause its failure.
Improper installation: If the installation of the seal ring is offset, distortion and other problems, it will affect the sealing effect, resulting in leakage.
conclusion
Seals play a vital role in a variety of application scenarios, and their design, verification and maintenance are directly related to the reliability and performance of the equipment. By understanding the sealing principle of the seal ring, optimizing the design, strict verification and timely handling of failure problems, the performance of the seal ring can be effectively improved, its service life can be extended, and the normal operation of the equipment can be ensured.