Sealing rings are used in all walks of life in today’s society, and are indispensable sealing elements in much equipment. Its main function is to ensure the sealing of the equipment, prevent medium leakage and external impurities from entering the interior of the equipment, to achieve the purpose of ensuring the normal operation and safety of the equipment. As for the working principle of the sealing ring, Linde Polymer will introduce it to you from the following aspects.

Classification of sealing rings

Sealing rings are mainly divided into two types: dynamic and static. Dynamic sealing rings are generally used for the sealing of rotating shafts, and are used in automotive wheel loads, generators, compressors, pumps and other equipment. Static sealing rings are more commonly used in gas or liquid sealing, such as valves, pipelines, hydraulic systems and closed instruments and other equipment. According to the material classification, the sealing ring is made of rubber, plastic, metal and composite materials.

The effect of the sealing rings

It mainly includes two aspects: one is to adaptively fill the tiny gaps in the sealing surface gap according to the elasticity and deformability of the material to prevent medium leakage. The second is to prevent external media from entering the sealed equipment according to the principle of friction.

Since the main material used is rubber and other elastic materials, for irregular sealing surfaces such as threads, convex and concave, the gap can be adaptively filled according to the elasticity and deformability of the material, to achieve the purpose of complete sealing. For example, when the compressor is connected to the valve, the sealing ring at the lower part of the valve stem is directly installed on the stationary valve seat, while the upper part of the sealing ring is in contact with the end of the piston rod, because the piston carried by the piston rod moves up and down under the action of compressed gas. Because of the reciprocating motion, there must be a certain gap between the valve with the sealing ring and the piston rod, but because the material of the sealing ring has certain elasticity, the gap can be filled adaptively and achieve a complete sealing effect.

The external medium is prevented from entering the sealed equipment through the principle of friction to ensure the airtightness of the equipment. For example, in the pneumatic device of automatic production equipment, the sealing ring of the cylinder should not only seal the gas, but also prevent impurities such as dust and moisture from entering, to ensure the precision of cylinder processing and the safety of operation.

Sealing rings design and selection

Design and material selection are very important. According to different pressures, temperatures, media, friction conditions and use requirements, the selection of appropriate materials and specifications can give full play to the performance of the seal and avoid medium leakage and equipment failure.

When designing the sealing ring, it is necessary to consider factors such as the gap between the sealing surfaces, the cross-sectional shape of the sealing ring, and the contact area to ensure normal sealing performance. At the same time, it is also necessary to consider the wear resistance, oil resistance, high temperature resistance, corrosion resistance and other properties of the sealing ring.

According to different usage requirements, different sealing materials can be selected:

Rubber materials have excellent elasticity, deformability and wear resistance, and are widely used in automotive, aviation, chemical and other fields.
Metal materials have good high temperature resistance, corrosion resistance and compression resistance, and are widely used in aerospace, nuclear engineering and other fields.
Plastic materials are light in weight, corrosion resistant, and have exceptional insulation properties, and are widely used in electronics, electrical appliances and other fields.
Composite materials combine the advantages of multiple materials to design seals with more exceptional sealing performance.

Application range of sealing rings

Widely used in machinery, aviation, automobile, chemical industry, construction and other fields, mainly used in the following aspects:

Automobile industry: engine, transmission, oil pump, brake, clutch, etc.
Industrial machinery: air compressors, water pumps, hydraulic cylinders, turbines, generators, etc.
Electronic appliances: batteries, motors, instruments and meters, etc.
Chemical industry: pipes, containers, pumps, valves, etc.

Maintenance of sealing rings

Regularly check the deformation and damage to the sealing ring, and replace it in time if any abnormality is found.
Keep surfaces clean and free from contamination from dust, foreign objects and chemicals.

Choose adaptable and anti-aging materials, and pay attention to the maintenance of the sealing ring under extreme, The sealing ring is a key sealing element, and its quality directly affects the operation and safety of the equipment. In the selection and use, we need to comprehensively consider different factors to ensure its performance and stability.