German Micromat Spannhydraulik seals, Micromat Spannhydraulik models, Micromat Spannhydraulik prices

Micromat Spannhydraulik seals are typical representatives of oil seals. The term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is to isolate components requiring lubrication within transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like rebar in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves as a dust shield, preventing external dust, impurities, and other contaminants from entering the machine interior. Based on skeleton type, they can be classified as inner-encased skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be classified as rotary skeleton oil seals and reciprocating skeleton oil seals. They are used in applications such as gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, and axles.

Micromat Spannhydraulik seal principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft; this oil film possesses fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the interface with air, 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 excessive, 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, overheating and wear are likely. 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 from the housing to maintain the formation of an oil film at the sealing surface.

Micromat Spannhydraulik 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 motions. They are installed on heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their primary function is to prevent the permeation of sealed media (gases, liquids) and the ingress of external foreign matter into the body. Precautions: Standard oil seals have a very limited pressure-bearing range, typically 0.03 MPa. This pressure is generally generated by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

Micromat Spannhydraulik seal installation and shutdown

1) Before startup, ensure the seal chamber is filled with liquid. When transporting solidified media, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before startup to prevent sudden startup from causing fracture of the soft ring. 2) For mechanical seals utilizing an external seal oil system, start the seal oil system first. After shutdown, stop the seal oil system last. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging the seal components.

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