Germany grossmann seals grossmann model grossmann price

grossmann 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, in conjunction with auxiliary seals. When 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.

grossmann 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 the end 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 not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from 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.

grossmann seal function

The function of a skeleton oil seal is generally to isolate the components requiring lubrication in the transmission parts from the output parts, 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 enabling 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, motorcycle 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. The requirements for oil seals are that the 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.

grossmann seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam to escape from the shaft seal, making it easy for water to enter the oil and causing deterioration of the turbine oil quality. Excessively high shaft seal pressure will cause the equalizing box safety valve to operate, wasting the working medium and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, which seriously threatens equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, if the temperature is too high, it will cause intense heating at the shaft end steam seal and the rotor steam seal section, producing local stress concentration phenomena, thereby causing certain deformation, which may change the clearance between the rotor and the cylinder, increase the amount of steam leakage from the shaft seal, and increase differential expansion, potentially leading to serious dynamic and static friction. When the shaft seal temperature is too low, it will cool the shaft end steam seal and the rotor steam seal section; similarly, it will produce local stress concentration phenomena, changing the clearance between the cylinder and the rotor, increasing the amount of air leakage at the shaft end, and decreasing differential expansion. When the shaft seal temperature is too low, the steam supplied to the shaft seal may contain water, causing water hammer in the shaft seal steam supply pipeline. In severe cases, this can cause water ingress into the steam turbine.

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