German lung seals lung models lung prices

lung seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to working pressure, static seals can be further divided into medium and low-pressure static seals and high-pressure static seals. Medium and low-pressure static seals commonly use gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Others are classified as contact seals and non-contact seals based on whether the seal contacts the components moving relative to it; they can also be divided into circumferential seals and face seals based on the seal and contact location, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic seals achieve sealing by imparting kinetic energy to the medium during machine operation, hence they are sometimes called hydrodynamic seals.

lung seal principles

Due to the 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 of the oil film in contact with air to form a meniscus, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an 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 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 state of forming an oil film at the sealing surface.

lung seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing rotary and reciprocating motion. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents the permeation of sealed media (gas, liquid) and the entry of external foreign matter into the body. Precautions: The pressure-bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure needs to be sealed, high-pressure oil seals should be selected (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be chosen.

lung seal specifications and uses

1) Ordinary single-lip type: Generally used for sealing mineral oil, water, and other media on high and low-speed rotating shafts and reciprocating motion. Ordinary oil seals are used in environments with less dust and impurities, resistant to medium pressure< 0.05MPa, maximum linear speed 15m/s, reciprocating motion speed< 0.1m/s. 2) Ordinary double-lip type: In addition to the usage characteristics of the above-mentioned S type oil seals, it can also prevent dust. Ordinary oil seals with dust lips can prevent dust, resistant to medium pressure< 0.05MPa, linear speed ≤ 15m/s. 3) Springless type: Single-lip inner skeleton rubber oil seal without spring. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer skeleton single-lip type: Single-lip outer skeleton rubber oil seal with spring, thin waist, good followability, good rigidity. Ordinary oil seals are used in environments with less dust and impurities, resistant to medium pressure< 0.05MPa. Cases where rotational axis linear speed ≤ 15m/s. 5) Outer skeleton double-lip type: Double-lip outer skeleton rubber oil seal with auxiliary lip, thin waist, good followability, high rigidity, good coaxiality. Ordinary oil seals with dust lips can prevent dust, resistant to medium pressure< 0.05MPa. 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 conditions under high temperature and high speed, medium pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type right-hand, left-hand: Angled ribs are manufactured on the air side of the lip, utilizing hydrodynamic principles to produce a unidirectional pumping action with a return flow effect. Related to the rotation direction of the shaft, due to the return flow effect, the radial force is smaller than that of ordinary oil seals, reducing wear and heat generation, extending service life, suitable for medium pressure< 0.05MPa, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip, short and thick waist, has pressure-resistant function, working pressure ≤ 3MPa. Suitable for occasions where medium pressure ≤ 3MPa, suitable for shaft end oil seals of high-pressure pumps, generally PV value ≤ 8. Rotational axis linear speed ≤ 15m/s.

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