Material Selection And Leakage Prevention Of Hydraulic Seals

Hydraulic seals play a vital role in hydraulic equipment, which can prevent the leakage of hydraulic oil and ensure the normal operation of the hydraulic system. However, in actual use, hydraulic seals may encounter various problems, the most common of which is leakage. This paper will deeply analyze the causes of leakage of hydraulic seals, and put forward the corresponding solutions.
First, the cause of leakage of hydraulic seals
1.1. Improper selection of seal material
The material selection of seals is very important to prevent leakage of hydraulic oil. If the sealing material is soft, under the extrusion of physical mechanical strength, it is easy to penetrate into the seal gap, resulting in leakage. On the contrary, if the material is strong and the elastic deformation is difficult, it will also affect the sealing effect. In addition, when the sealing material does not match the hydraulic oil, problems such as swelling, softening and dissolution may occur, causing leakage.
1.2, sealing installation problems
The installation accuracy of seals has an important impact on their ability to prevent leakage. If the dimensional accuracy of the installation is not reasonable enough, or the accuracy of the overall shape position is poor, it may lead to leakage. For example, if the radial section size of the sealing groove is too large and the initial contact stress of the sealing surface is too low, it is easy to leak hydraulic oil. In addition, if the sealing installation surface is uneven, there are burrs, scratches and other quality defects, it will also increase the risk of leakage.
1.3 Improper control of hydraulic seal installation clearance
In hydraulic equipment, the control of seal installation clearance is also the key to prevent leakage. If the gap is too large, the risk of hydraulic leakage under the action of pressure liquid will be greatly increased.
1.4. Pollution of hydraulic oil to seals
Impurities and contaminants in hydraulic oil can cause damage to seals, accelerate their wear and shorten their service life, thereby increasing the risk of leakage.
Second, hydraulic seal leakage solution
2.1, reasonable selection of seal material
For different hydraulic systems and hydraulic oil characteristics, it is very important to choose the right sealing material. In general, for high temperature, high pressure, high viscosity hydraulic oil, should choose high hardness, high temperature resistance, high pressure resistance, good wear resistance sealing material. For low temperature and low viscosity hydraulic oil, you can choose a sealing material with moderate hardness and good low temperature performance. In addition, it is also necessary to consider the compatibility of the sealing material and hydraulic oil to prevent swelling, softening and dissolution.
2.2. Improve the installation accuracy of seals
During the installation process, it is necessary to ensure that the dimensional accuracy and shape position accuracy of the seals meet the requirements. Advanced processing equipment and technology can be used to improve accuracy, such as CNC machine tool processing, laser cutting, etc. At the same time, quality defects such as scratches and scratches should be avoided during installation to ensure the smoothness and smoothness of the sealing surface.
2.3, reasonable control of hydraulic seal installation clearance
In the process of hydraulic device design and installation, the installation gap of seals should be reasonably controlled. It can be achieved by optimizing the design of hydraulic system and selecting reasonable hydraulic components and seals. In addition, during the installation process, it is necessary to ensure that the gap is uniform and consistent, so as to avoid adverse effects on the sealing effect of too large or too small gaps.
2.4. Prevent hydraulic oil pollution
In order to reduce the pollution of hydraulic oil to seals, the following measures should be taken: Use clean hydraulic oil; Replace the hydraulic oil filter element regularly; Strengthen the management and maintenance of hydraulic oil; Avoid external pollutants into the hydraulic system. In addition, devices such as filters can be set up in the hydraulic system to further purify the hydraulic oil.
Iii. Conclusion
Leakage of hydraulic seals is a common and complex problem, and its causes are various. In order to solve this problem, it is necessary to comprehensively consider the selection of seal material, installation accuracy control, clearance control and prevention of hydraulic oil pollution. Through reasonable material selection and design, strict installation and maintenance measures and effective pollution control means to reduce the risk of leakage and improve the reliability and service life of the equipment.