スタティック・シール

Static sealing with rubber seals refers to sealing achieved using a rubber seal between two immovable components, where the rubber seal does not undergo significant deformation or movement. This sealing method is usually used for stationary or static applications, such as valves, pipe joints, flange connections, containers, and other static or low-speed moving sealing parts. Since there is no friction, the requirements for wear resistance are not high, but there are strict requirements on operating temperature, mechanical strength, and deformation rate.

Overview of main types

O-rings: O-rings are annular rubber seals with a circular cross-section. They are commonly used in static sealing applications such as mechanical seals, pipe connections, valves, pumps, and automotive engines. O-rings can provide good sealing performance and are suitable for a variety of working conditions.

Flat gaskets: Flat gaskets are flat-shaped seals commonly used in static sealing applications such as flange connections, piping systems, and containers. They are usually made of rubber or other flexible materials and can fill in imperfectly flat surfaces to create a reliable seal.

X-rings: X-rings, also known as four-lip seals, have a cross-sectional shape. They provide better sealing performance than O-rings and can withstand higher pressures and greater deformations. X-rings are commonly used to seal hydraulic systems, pneumatic equipment, and rotating shaft seals.

Square rings: Square rings have a square or rectangular cross-sectional shape and are commonly used in static sealing applications such as valves, joints, and pipe connections. They provide a large sealing contact area and can provide good sealing performance in high-pressure and high-temperature environments.

V-rings: V-rings are rubber seals with a V-shaped cross-section that can be used for static seals and rotating shaft seals. They are suitable for sealing liquids, oils, and dust and are commonly used in automobiles, mechanical equipment, and hydraulic systems.

素材

Nitrile Butadiene Rubber (NBR): Nitrile Butadiene Rubber is a general-purpose rubber material that has good oil and abrasion resistance and is suitable for static sealing applications of liquids and gases. It is commonly used to seal automobile engines, hydraulic systems, pipe connections, etc.

Fluorine rubber (FKM/Viton): Fluorine rubber has excellent high-temperature resistance and chemical resistance, and can provide excellent sealing performance under extreme environmental conditions. It is often used in static sealing applications that require high-temperature resistance and corrosion resistance, such as chemical equipment, the petroleum industry, aerospace, etc.

エチレンプロピレンゴム (EPDM): Ethylene-propylene rubber has excellent weather resistance, aging resistance, and acid, and alkali resistance, and is suitable for static sealing applications in outdoor environments and some special chemical media. It is commonly used in piping systems, cooling systems, etc.

シリコーン: Silicone rubber has a wide operating temperature range and excellent high-temperature resistance, and can maintain elasticity and sealing performance under extreme temperature conditions. It is commonly used in high-temperature sealing applications such as hot water systems, engine components, stoves, etc.

Neoprene (CR): Neoprene has good oil and corrosion resistance and is suitable for static sealing applications of liquids and gases. It is commonly used in automobile manufacturing, shipbuilding industry, chemical equipment, etc.

Characteristics of static sealing

Static sealing refers to the sealing achieved by rubber sealing elements without relative movement between two or more parts. The following are some characteristics of static seals:

High sealing performance: Static sealing usually requires a high degree of sealing performance, which can effectively prevent the leakage of media and the entry of external impurities.

Stability: Static sealing generally does not involve relative movement of parts, so the sealing elements are relatively stable in the static sealing state and will not cause wear and fatigue due to movement.

Lower friction and wear: Since there is no relative movement, the contact surface between the sealing element of the static seal and the parts has no friction, so friction and wear are relatively low, and the service life of the sealing element is longer.

Suitable for high-pressure and high-temperature environments: Static seals can usually adapt to higher pressures and temperatures, and some sealing elements of special materials can even be used under extremely high-pressure and high-temperature conditions.

Relatively simple design and manufacturing: Compared with dynamic seals, the design and manufacturing of static seals are relatively simple. Usually, only the cooperation of the contact surface between the sealing element and the part and the selection of materials need to be considered.

Not suitable for dynamic applications: Static sealing is only suitable for situations where there is no relative movement. If there is relative movement or vibration of parts, static sealing usually cannot meet the requirements, and dynamic sealing is required.

応用分野

Rubber seals are widely used in many fields for static sealing.

Industrial Equipment: Rubber seals are used for static sealing in various industrial equipment, such as pumps, valves, pressure vessels, pipe connections, etc. They can effectively prevent medium leakage and the entry of external impurities, ensuring the normal operation and safety of the equipment.

Automobile industry: Rubber seals are widely used for static sealing in automobile manufacturing and repair. They are used for engine sealing, transmission systems, braking systems, fuel systems, and body parts to ensure the normal operation and sealing performance of each system.

Aerospace Industry: Rubber seals play an important role in the aerospace industry. They are used in static sealing applications such as aircraft engines, aerospace vehicle fuel systems, hydraulic systems, and pneumatic systems to ensure system reliability and safety.

Medical equipment: Rubber seals are widely used for static sealing in medical equipment, such as medical syringes, infusion sets, hemodialysis equipment, etc. They can effectively seal medical fluids and biological samples to ensure the hygiene and safety of medical equipment.

Electronic and electrical equipment: Rubber seals are used for static sealing in electronic and electrical equipment such as cable joints, switches, sockets, etc. They prevent dust, moisture, and other external substances from entering the equipment, protecting its normal operation and durability.