German ackrutat seals ackrutat models ackrutat prices

ackrutat seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and hydrodynamic seals.

ackrutat seal principle

Since there is an oil film controlled by the oil seal lip edge 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 of the oil film in contact with air to form a meniscus, preventing the leakage of the working medium and thereby 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 the thickness is 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 it is not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the formation of an oil film at the sealing surface.

ackrutat seal function

The function of a skeleton oil seal is generally to isolate components requiring lubrication in the transmission assembly from the output components, preventing lubricating oil from leaking. 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. According to the skeleton type, it can be divided into inner skeleton oil seals, outer skeleton oil seals, and exposed inner and 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, and other parts. 1) Prevent sand, dust, water vapor, etc., from entering the bearing from the outside; 2) Restrict the leakage of lubricating oil from the bearing. Requirements for oil seals include that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; appropriate elasticity is required to properly grip the shaft and achieve a sealing effect; they must be heat-resistant, wear-resistant, have good strength, be resistant to media (oil or water, etc.), and have a long service life.

ackrutat seal specifications and applications

1) Standard single-lip type: Generally used for sealing mineral oil, water, and other media on high- and low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with less dust and impurities, resisting media pressure<0.05MPa conditions, maximum linear speed 15m/s, reciprocating motion speed<0.1m/s. 2) Standard double-lip type: In addition to the usage characteristics of the above-mentioned S type oil seals, it also provides dust protection. Standard oil seals with a dust lip can prevent dust ingress, resisting media pressure<0.05MPa conditions, linear speed ≤ 15m/s. 3) Springless type: Single-lip internal skeleton rubber oil seal without a spring. Generally suitable for low-speed operating conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer skeleton single-lip type: Single-lip exposed skeleton rubber oil seal with a spring, featuring a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resisting media pressure<0.05MPa conditions. Cases where the rotating shaft linear speed is ≤ 15m/s. 5) Outer skeleton double-lip type: Double-lip exposed skeleton rubber oil seal with a secondary lip, featuring a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resisting media pressure<0.05MPa conditions. Rotational speed ≤ 15m/s. 6) Assembled single-lip type: Outer skeleton oil seal formed by assembling inner and outer skeletons with rolled edges, featuring high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load operating conditions under high temperature and high speed, media pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type, right-hand and left-hand rotation: Angled ribs are manufactured on the air side of the lip, utilizing hydrodynamic principles to generate a unidirectional pumping action with a return flow effect. Related to the direction of shaft rotation, due to the return flow effect, the radial force is smaller than that of standard oil seals, reducing wear and heat generation, and extending service life. Suitable for media pressure<0.05MPa conditions, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance, working pressure ≤ 3MPa. Suitable for applications where media pressure is ≤ 3MPa, suitable for shaft end oil seals of high-pressure pumps. Under normal circumstances, the PV value is ≤ 8. Rotating shaft linear speed ≤ 15m/s.

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