O-ring is a common sealing ring, because of its cross-section shape like the English letter "O", so named. It is widely used in various machinery and equipment, and plays an important role in sealing. During the use of O-ring, the compression permanent deformation is one of the important indexes to evaluate its performance. The concept, evaluation method and standard of O-ring compression permanent deformation are described in detail below.
1. the concept of compression permanent deformation
Compression permanent deformation refers to the characteristics of the O-ring under continuous pressure, the shape and size of the irreversible change. It is one of the important indexes to evaluate the sealing performance of O-ring. When the O-ring is subjected to pressure for a long time, its shape and size may change, resulting in reduced sealing performance or even loss of sealing effect.
2. Evaluation method of compression permanent deformation
Compression permanent deformation assessment is a method to detect the shape and size change of O-rings under continuous pressure. There are three commonly used evaluation methods: compression rebound test, compression permanent deformation test and oven test.
Compression rebound test: The O-ring is placed on a standard test bench, continuous pressure is applied by a weight, and the change of the resilience of the O-ring is recorded to evaluate its compression permanent deformation performance.
Compression permanent deformation test: the O-ring is placed on a standard test bench, continuous pressure is applied by a weight, and after a certain time, the pressure is relieved and the permanent deformation of the O-ring is measured to evaluate its compression permanent deformation performance.
Oven test: The O-ring is placed in the oven, the temperature is raised and held for a certain time, and then the size change and hardness change of the O-ring are detected to evaluate its compression permanent deformation performance.
3. Evaluation standard of compression permanent deformation
The evaluation standard of compressive permanent deformation is the basis to measure the performance of O-ring compressive permanent deformation. According to different materials and uses of O-rings, the evaluation standards will be different. In general, the compression permanent deformation of the O-ring should be no more than 5%, and it should be able to quickly return to its original state after relieving the pressure to ensure its sealing performance and service life.
In short, compressive permanent deformation is one of the important indexes to evaluate the performance of O-rings. By mastering the concept, evaluation method and standard of compression permanent deformation, it is helpful to correctly select and use suitable O-rings, and improve the performance and stability of equipment.
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