German RIFOX seals RIFOX models RIFOX prices

RIFOX 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 in transmission systems, and also refers to general liquids), isolating lubricated parts from output parts in transmission components 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. Generally, when people refer to oil seals, they often mean this type of tc skeleton oil seal.

RIFOX seal principle

Since there is an oil film controlled by the oil seal lip between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end where the oil film contacts air to form a meniscus, preventing leakage of the working medium and thus achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis. If not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep out from the housing to achieve the formation of an oil film at the sealing surface.

RIFOX seal function

The function of a skeleton oil seal is generally to isolate lubricated parts from output parts in transmission components, preventing lubricating oil leakage. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like reinforcement bars in concrete components, providing strengthening and allowing the oil seal to maintain its shape and tension. Based on the skeleton type, it can be divided into inner skeleton oil seals, outer skeleton oil seals, and exposed inner/outer skeleton oil seals. Skeleton oil seals are made of high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles, motorcycles, crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, etc. 1) Prevent sand, dust, water vapor, etc., from entering the bearing from the outside; 2) Restrict lubricating oil in the bearing from leaking out. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) complying with regulations; appropriate elasticity to properly grip the shaft for sealing; heat resistance, wear resistance, good strength, media resistance (oil or water, etc.), and long service life.

RIFOX seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact 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 dynamic ring sealing ring, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if equipped with a shaft sleeve, the 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; (customary practice: face runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm; 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 ends of the shaft sleeve where the dynamic ring sealing ring is installed, and the ends of the gland (or housing) where the static ring sealing ring is installed, should be chamfered and smoothed. 7) Be careful when installing or removing mechanical seals; strictly prohibit using hammers and flat chisels to avoid damaging sealing elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, take care during assembly and disassembly to avoid neglecting one side while attending to 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 and should not be retightened for continued use. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surface.

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