Germany Kral seals Kral models Kral prices

Kral seals are a typical representative of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to 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 seal, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotary skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

Kral 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 where the oil film contacts the air to form a meniscus, preventing 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 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 to seep out from the housing to achieve the state of forming an oil film at the sealing surface.

Kral seal function

The function of a skeleton oil seal is generally to isolate components requiring lubrication in transmission parts from output 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 reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to skeleton type, they can be divided into inner skeleton oil seals, outer skeleton oil seals, and inner/outer exposed skeleton oil seals. Skeleton oil seals are made from high-quality nitrile rubber and steel plates, offering stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from invading bearings from the outside; 2) Restrict lubricating oil in bearings from leaking out. 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; heat resistance, wear resistance, good strength, media resistance (oil or water, etc.), and long service life are required.

Kral seal common issues

Zero leakage in sealing is the perpetual pursuit for chemical equipment; it is this requirement that has promoted the increasingly widespread application of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage, such as the service life issues of magnetic drive pump isolation cans and canned motor pump shielding cans, material pitting corrosion issues, the need for corrosion-resistant sealing materials, reliability issues of static seals, etc. A brief introduction to some basic situations regarding sealing is as follows: 1. Sealing forms For static seals, there are usually only two forms: gaskets and O-rings, with O rings being the most widely used; for dynamic seals, chemical pumps rarely use packing seals, primarily using mechanical seals. Mechanical seals are further divided into single-face and double-face, balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (typically referring to pressures greater than 1.0MPa). Double-face mechanical seals are mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or are toxic and volatile. For double-face mechanical seals, a barrier fluid should be injected into the seal chamber, with its pressure generally higher than the medium pressure by 0.07～0.1MPa. 2. Sealing materials Static sealing materials for chemical pumps generally use fluororubber, with PTFE materials used only in special cases; the material configuration of the stationary and rotating rings of mechanical seals is critical. It is not necessarily best to pair cemented carbide with cemented carbide; high cost is one aspect, and it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to differentiate based on the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed provisions for typical configurations of mechanical seals and piping systems in Appendix D).

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