The principle of dimensional fit between sealing ring and sealing groove?

The size match between the sealing ring and the sealing groove should follow the following principles:

1. Appropriate clearance: The outer diameter of the sealing ring should be slightly larger than the inner diameter of the sealing groove to ensure that the sealing ring can be completely filled with the sealing groove and provide a good sealing effect. Generally, the outer diameter of the sealing ring should be about 0.2-0.5mm higher than the inner diameter of the sealing groove.

2. Appropriate compression: the sealing ring needs to be compressed during installation to produce a sealing effect. The amount of compression should be determined according to the characteristics of the sealing material and the application requirements. In general, the compression of the sealing ring should be maintained between 5-30%.

3. Consider thermal expansion and cold contraction: in high temperature or low temperature environment, the sealing material will have thermal expansion and cold contraction, so when choosing the size of the sealing ring and sealing groove, it is necessary to consider the coefficient of thermal expansion and cold contraction of the material to ensure that the good sealing performance can be maintained when the temperature changes.

4. Consider the elasticity and deformation of the material: the size of the sealing ring and the sealing groove should take into account the elastic and deformation characteristics of the sealing material. The sealing ring should be able to return to the proper shape after being compressed to ensure the sealing effect.

These principles can help ensure that the dimensions between the sealing ring and the sealing groove are properly matched to achieve a good sealing effect. In practical applications, it is also necessary to carry out specific design and selection according to specific engineering requirements and material characteristics.