German HARDO Maschinenbau seals, HARDO Maschinenbau models, HARDO Maschinenbau prices

HARDO Maschinenbau seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the rotation axis maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with auxiliary seals. If the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components: a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or fixing screws.

HARDO Maschinenbau 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 it to form a meniscus at the interface with air, preventing the 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, 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 from the housing to seep out to form an oil film at the sealing surface.

HARDO Maschinenbau seal function

The function of a skeleton oil seal is generally to isolate components requiring lubrication in the transmission system 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 reinforcement bars in concrete components, providing strengthening and allowing the oil seal to maintain its shape and tension. Based on the skeleton type, they can be classified as inner skeleton oil seals, outer skeleton oil seals, and exposed inner/outer skeleton oil seals. Skeleton oil seals are made from 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 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, resistance to media (oil, water, etc.), and long service life.

HARDO Maschinenbau seal common issues

Preventing leakage through sealing is a perpetual pursuit for chemical equipment. It is this requirement that has led to the increasingly widespread adoption of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage. For example, issues such as the service life of the isolation sleeve in magnetic drive pumps and the can in canned motor pumps, pitting corrosion of materials, the need for sealing materials with good corrosion resistance, and the reliability of static seals. The following is a brief introduction to some basic situations regarding sealing: 1. Sealing types For static seals, there are usually only two types: gaskets and O-rings. Among O-rings, the O-type ring is the most widely used; for dynamic seals, chemical pumps rarely use packing seals, but primarily use mechanical seals. Mechanical seals are further classified into single-face and double-face, as well as 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. Its pressure is generally 0.07 to 0.1MPa higher than the media pressure. 2. Sealing materials For static seals in chemical pumps, fluororubber is generally used. PTFE materials are used only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily best to pair cemented carbide with cemented carbide. High cost is one factor; furthermore, having no hardness difference between the two is also unreasonable. Therefore, it is best to handle them differently according to the characteristics of the medium (Note: The eighth edition of the American Petroleum Institute API610 provides relatively detailed provisions for typical configurations of mechanical seals and piping systems in Appendix D).

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