Analysis of failure leakage of rubber seal

With the rapid development of the information age, sealing technology plays an important role, if the superiority of the technology can not get to play, it will lead to the occurrence of serious consequences. And for the reliability of the hydraulic technology, because in the hydraulic system, the internal leakage will cause a sharp drop in volumetric efficiency, fail to work pressure and leakage will cause working medium waste and environmental pollution and equipment failure. Because of the sealing technology is widely used and the failure caused by hazards, at present at home and abroad attach great importance to the sealing technology application and research.

Rubber seals have a certain mechanical strength, elasticity, hardness, flexibility and other properties of the material between the filling coupling, isolation, cut off the flow channel liquid fluid; or increase the resistance to flow, eliminating the pressure difference between pages; or additional acting element, the leakage flow back into the source chamber

Rubber seals according the pressure level can be divided into: low pressure seal (0 ~ 5MPa), medium-pressure seal (5 ~ 16MPa), high pressure seal (16 ~ 40MPa), ultra-high pressure seal (40 ~ 70MPa), super high pressure seal (greater than 70MPa ).

Rubber seal modes and performance characteristics of failure are as follows:

(1) mechanical damage squeeze destruction;

(2) seals aging, cracks or cracks;

(3) chemical etching of the seal;

(4) local ablation, carbonization;

(5) the surface of serious wear and tear;

(6) Deformation kink.

The main reason for the sealing problems are: the problem of raw materials, storage problems of the seal, the seal structure design problem, choice of the seal, the seal assembly, hydraulic system contamination and the use, when find the problem, and solve it will be relatively simple. Firstly make sure that the two main parameters of the hydraulic system: pressure and flow. Wherein the pressure depends on the external load, and the flow velocity depends on the size and structure of the hydraulic actuator. There are different load factor for different external loads, and you need to consider the flow of hydraulic seal pressure rating, end mask pressure, medium pressure and friction during exercise and other factors to select more suitable sealing material.