German Ackmann seals Ackmann models Ackmann prices

Ackmann seals are the customary term for general seals, simply referring to lubricating oil seals. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission components from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; the term oil seal generally refers to this type of tc framed oil seal.

Ackmann seal classification

Oil seals are generally divided into single-piece types and assembled types. Assembled types allow free combination of the frame and lip material, generally used for special oil seals. Based on the sealing function, characteristics, structural type, working status, and sealing mechanism, oil seals can be divided into various forms and names. However, conventionally, rotary shaft lip seals are called oil seals, while seals used for static sealing and dynamic sealing (generally reciprocating motion) are called seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; the term oil seal generally refers to this type of tc framed oil seal.

Ackmann 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, resistant to various lubricating oils, greases, oil-gas mixtures, etc. Applicable temperature range: -30~120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic oils and gear oils containing extreme pressure additives. It performs stably in gasoline and mineral oils with low aniline points. 2) Polyacrylate Rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. Especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic oils containing extreme pressure agents. Suitable for working in the range of -30~150 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, its cold resistance and high-temperature wear resistance are poor, and it has significant permanent compression deformation. Suitable for temperatures -20~250 degrees Celsius. 4) Silicone Rubber: Has outstanding high and low-temperature resistance. It can be used super-long term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h. It maintains its unique elasticity, ozone resistance, and weather resistance within the working temperature range of -70~260. 5) Polytetrafluoroethylene: Has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can work normally in the temperature range of -200~300 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 negative commonalities of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena are still relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, one must consider the material's compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft during high-speed rotation. Generally, when an oil seal is working, the lip temperature is 20~50℃ higher than the working medium temperature, which should be noted when selecting oil seal materials. The working range of an oil seal depends on the material used: Nitrile Rubber (NBR) is -40~120℃, Acrylic Rubber (ACM) is -30~180℃, and Fluorocarbon Rubber (FPM) is -25~300℃.

Ackmann seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation greatly affect their service life. We generally follow the standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the mating parts of the mechanical seal are as follows: 1) Shaft bending: Maximum not greater than 0.05 mm; 2) Rotor runout: Near the shaft sleeve at the moving ring seal area, not greater than 0.06 mm; 3) Axial shaft movement is not allowed to exceed ±0.5 mm. If a shaft sleeve is present, the shaft sleeve must not be loose; 4) Coupling alignment error: For gear couplings, not greater than 0.08～0.10 mm (P2008C); for elastic couplings, not greater than 0.05～0.06 mm; (conventional practice: face runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm. The perpendicularity tolerance of the surface contacting the gasket relative to the centerline is 0.03～0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The end of the shaft sleeve where the moving ring seal is installed, and the end of the gland (or housing) where the static ring seal is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals. Strictly prohibit the use of hammers and flat chisels to avoid damaging seal elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, coordinate during assembly and disassembly to prevent neglecting one side for the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the stationary and rotating ring parts must be replaced. Do not simply re-tighten and continue using them. Because after loosening, the original operating trajectory of the friction pair changes, and the sealing of the contact surface is easily compromised.

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