O- ring ( also known as O -ring, O -ring, seal oil seal, etc. ) is a common seal, widely used in various mechanical equipment and industrial fields, pneumatic pump metering pump valve field. Proper selection and installation of O -ring can guarantee its sealing performance and life to the greatest extent. Dongsheng Seals tells you that this article will introduce in detail how to correctly select and install the O - ring , and analyze its material, application, sealing principle and life.
1. How to choose an O-ring?
- Sealing environment: Select the appropriate material according to the medium, temperature, pressure, speed, chemical properties and other factors of the sealing environment to ensure the wear resistance, corrosion resistance, temperature resistance, oil resistance and other characteristics of the O -ring.
- Sealing requirements: Select appropriate parameters such as section size and hardness according to the sealing requirements to ensure the sealing performance of the O -ring.
- Installation method: Choose the appropriate shape and size according to the installation method to ensure that the sealing ring can work normally after installation.
- Working conditions: According to the working conditions, select the appropriate O -ring material with the characteristics of pressure resistance, temperature resistance, corrosion resistance and wear resistance to ensure that the sealing ring can work normally in different working environments.
- Cost considerations: Consider the cost issue according to the budget and service life, and select the appropriate O -ring material and size.
Second, the material of the O-ring
O -ring seals ( also known as O -rings, O -rings, seal oil seals, etc. ) are mainly made of rubber, silica gel, fluorine rubber, nitrile rubber, ethylene propylene rubber, etc. O -rings of different materials have different characteristics and scope of application.
- Rubber: Wear and corrosion resistance, good oil resistance, but poor high and low temperature resistance, suitable for general industrial equipment, water pumps, automobiles and other fields.
- Silicone: Good high and low temperature resistance, good oxidation resistance, radiation resistance, suitable for food, medical equipment, semiconductor equipment and other fields.
- Viton: good high temperature resistance, chemical corrosion resistance, good oil resistance, suitable for chemical, petroleum, aerospace, medical equipment and other fields.
- Nitrile rubber: good oil resistance, wear resistance and corrosion resistance, good high and low temperature resistance, suitable for petroleum, chemical industry, automobile, ship and other fields.
- Ethylene-propylene rubber: wear-resistant and corrosion-resistant, good oxidation resistance, good elasticity, suitable for general industrial equipment, electronics, communications, furniture and other fields.
3. Manufacturing process of O-ring
The manufacturing process of O -ring ( also called O -ring, O -ring, seal oil seal, etc. ) mainly includes extrusion molding, compression molding and injection molding.
- Extrusion molding: Extrude the rubber strip into a circle, then cut it into a certain length, and then shape it.
- Compression molding: the rubber sheet is cut, glued, and compressed into shape.
- Injection molding: The rubber material is plasticized and injected into the mold, and an O -ring is formed through high temperature and high pressure.
Fourth, the application field of O-ring
O -rings are widely used in machinery, automobiles, electric power, chemical industry, aerospace and other fields. Its main application scenarios include the following aspects:
- Mechanical field: O -rings are widely used in various mechanical equipment, such as water pumps, compressors, engines, transmission systems, etc., to ensure the sealing performance of mechanical equipment.
- Automotive field: O -rings are widely used in automobile engines, transmissions, oil pumps, water pumps and other components to ensure the sealing performance of automobile engines and prevent oil or coolant leakage.
- Power field: O -rings are used in power equipment, such as transformers, insulators, cable joints, etc., to ensure the sealing performance of power equipment.
- Chemical industry: O -rings are used in chemical equipment, such as pipelines, pumps, valves, etc., to ensure the sealing performance of chemical equipment.
- Aerospace field: O -rings are used in aerospace equipment, such as engines, hydraulic systems, fuel systems, etc., to ensure the sealing performance of aerospace equipment.
5. The sealing principle of the O-ring
The sealing principle of O -ring ( also called O -ring, O -ring, seal oil seal, etc. ) is to use its elastic deformation and extrusion deformation to fill the sealing gap and prevent medium leakage. When the O -ring is installed in the sealing groove, its cross-section is annular, and it contacts with the sealing groove wall to form a seal. When the medium is pressed into the sealing gap, the O -ring will undergo elastic deformation and extrusion deformation, filling the sealing gap, so as to realize the sealing effect.
Six, O-ring installation method
- Check the sealing groove and sealing ring: Before installation, it is necessary to check whether the sealing groove and sealing ring are clean, flat, free of damage or deformation.
- Apply lubricant: Before installation, apply a small amount of lubricant to make it easier for the seal to fit into the seal groove.
3. Appropriate stretching: When putting the sealing ring into the sealing groove, the sealing ring should be properly stretched to make it cling to the wall of the sealing groove to ensure the sealing performance of the sealing ring.
- Do not overstretch: When stretching, do not overstretch the sealing ring, otherwise it will cause deformation or fracture of the sealing ring and affect the sealing performance.
- Do not distort: Do not distort the sealing ring during installation, otherwise it will cause cracking or damage of the sealing ring and affect the sealing performance.
- Do not use tools: When installing, do not use tools for forced installation, so as not to damage the sealing ring or sealing groove.
- Check the installation quality: After installation, the installation quality must be checked, including whether the sealing ring is completely installed in the sealing groove, whether there is deformation or fracture, etc., to ensure the sealing performance.
Seven, O-ring life
The service life of O -ring ( also known as O -ring, O -ring, seal oil seal, etc. ) is affected by many factors, mainly including the following aspects:
- Material: O -rings of different materials have different lifespans. Generally, rubber seals have a shorter lifespan, while high-performance materials such as fluororubber and silicone have a longer lifespan.
- Working conditions: The service life of the O -ring is affected by working conditions, such as temperature, pressure, chemical properties of the medium, etc.
- Installation quality: The installation quality of the sealing ring will affect its service life. Improper installation will lead to deformation or damage of the sealing ring, thus affecting its sealing performance and life.
- Use environment: The dryness, humidity, chemical medium, vibration, etc. of the use environment will affect the service life of the sealing ring.
- Maintenance: regular inspection and maintenance of sealing rings, timely replacement of aging or damaged sealing rings can prolong the service life of sealing rings.
The service life of O -rings ( also known as O -rings, O -rings, seal oil seals, etc. ) is a comprehensive issue. The above factors need to be considered comprehensively, and reasonable selection and use should be made according to actual conditions.
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