German DICKOW PUMPEN seals, DICKOW PUMPEN models, DICKOW PUMPEN prices

DICKOW PUMPEN seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; the oil seal commonly referred to is this type of tc skeleton oil seal.

DICKOW PUMPEN 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 slightly to achieve the state of forming an oil film at the sealing surface.

DICKOW PUMPEN 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. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents the penetration 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 (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

DICKOW PUMPEN seal installation precautions

1) During installation, pay close attention to avoid installation deviations generated during the process. Tightening the pressure cover should be performed after coupling alignment. Bolts should be tightened evenly to prevent skewing of the pressure cover end face. Check each point with a feeler gauge; the error shall not exceed 0.05 mm. Check the fit clearance (i.e., concentricity) between the pressure cover and the outer diameter of the shaft or shaft sleeve; it must be uniform around the circumference. Check each point with a feeler gauge; the allowable error shall not exceed 0.01 mm. 2) Spring compression must be carried out according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression will increase the specific pressure on the end face, accelerating end face wear. Insufficient compression will result in inadequate specific pressure and fail to achieve a sealing effect. 3) After installing the moving ring, pressing it against the spring should allow it to spring back automatically. 4) Position requirements during installation: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, it is very important to install it correctly on the machine. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, pay attention to any abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve in contact with packing, sealing rings (O rings), flanges, and other components. If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than needed to the site. In this way, if there are remaining parts after installation, it indicates missing installations; if parts are insufficient, it means unnecessary parts were assembled, thus serving as a self-check during installation.

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