German Hanchen seals Hanchen models Hanchen prices

Hanchen seals are materials or components that prevent leakage of fluids or solid particles from adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30°C to avoid high-temperature aging. Seals are classified into static seals and dynamic seals. Their main function is to prevent leakage of fluids or solid particles from adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers and containers, used for sealing letters and testamentary stamps.

Hanchen seal classification

Oil seals are generally divided into single-piece types and assembled types. Assembled types allow free combination of the cage and lip material, and are generally used for special oil seals. Based on sealing function, characteristics, structural type, operating condition, and sealing mechanism, oil seals can be categorized into various forms with different names. However, by convention, rotary shaft lip seals are referred to as oil seals, while seals for static and dynamic (generally reciprocating) applications are called seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal with a garter spring fully encapsulated in rubber. The term 'oil seal' commonly refers to this type of tc caged oil seal.

Hanchen seal materials

Common materials for oil seals include: Nitrile rubber, Fluorocarbon rubber, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat and wear resistance, and is resistant to various lubricating oils, greases, and oil-gas mixtures. The applicable temperature range is -30 to 120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic fluids or gear oils containing extreme pressure additives. It performs stably in gasoline and low-aniline-point mineral oils. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. It is especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. Suitable for operation in the range of -30 to 150 degrees Celsius. 3) Fluorocarbon rubber: Resistant to aging, heat, and oil. Suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, and exhibits significant permanent compression set. Suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: Outstanding high and low temperature resistance. Can be used long-term at 150 degrees Celsius without performance change; can be used continuously at 200 for 10000h; maintains its unique elasticity, ozone resistance, and weather resistance in the working temperature range of -70 to 260. 5) Polytetrafluoroethylene: Outstanding chemical stability, thermal stability, low friction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can operate normally in the temperature range of -200 to 300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing, though at a higher cost. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, making leakage relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft at high speeds must be considered. Generally, the lip temperature of an oil seal is 20 to 50°C higher than the working medium temperature, which should be noted during material selection. The operating range of an oil seal depends on the material: Nitrile rubber (NBR) is -40 to 120°C, Acrylic rubber (ACM) is -30 to 180°C, and Fluorocarbon rubber (FPM) is -25 to 300°C.

Hanchen seal precautions

1) Shaft speed: Due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals. Low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: In high-temperature conditions, select polyacrylate, silicone, fluorocarbon, or fluorosilicone rubber. Measures should be taken to reduce the oil temperature in the tank. In low-temperature conditions, select cold-resistant rubber. (3) Pressure: General oil seals have poor pressure resistance and will deform under excessive pressure. Under high-pressure conditions, pressure-resistant support rings or reinforced pressure-resistant oil seals should be used. 4) Installation eccentricity: Excessive eccentricity between the oil seal and the shaft reduces sealing performance, especially at high shaft speeds. If eccentricity is excessive, oil seals with a 'W' cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; a higher surface finish results in a longer service life. 6) Ensure there is an adequate amount of lubricating oil on the oil seal lip. 7) Take special care to prevent dust from entering the oil seal.

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