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Mechanical seals have a rich history that dates back to the early 20th century. Before their invention, gland packing was the most common method used to seal rotating equipment like pumps and mixers. However, gland packing had several limitations, such as high leakage rates, frequent maintenance requirements, and high energy consumption due to friction. The need for a more efficient and reliable sealing solution led to the development of mechanical seals. The first mechanical seal, known as the 'end face mechanical seal,' was invented and patented by George J. Cooke in the United States in . This invention marked a significant advancement in sealing technology, as it provided a way to create a nearly leak-free seal between rotating and stationary components.
Over the years, mechanical seals evolved and became more sophisticated, with improvements in materials, designs, and supporting systems. The development of new materials, such as advanced ceramics, elastomers, and alloy steels, allowed mechanical seals to withstand higher pressures, temperatures, and corrosive environments. Additionally, the design of mechanical seals was refined to improve their performance and reliability. For example, the introduction of cartridge seals, which are pre-assembled units that can be easily installed without the need for precise setting measurements, made the installation and maintenance of mechanical seals much easier.
Today, mechanical seals are widely used in various industries, such as oil and gas, chemical, pharmaceutical, and water and wastewater treatment, to seal rotating equipment like pumps, compressors, and agitators. They play a crucial role in ensuring the safe and efficient operation of this equipment, minimizing leakage, reducing energy consumption, and minimizing environmental impact. The continuous research and development in this field have led to the creation of highly specialized mechanical seals that can handle the most challenging applications, making them an indispensable component in modern industrial operations.
SEPCO has sealing solutions for many applications, even those with the strictest standards and the most challenging environments. We have decades of experience in providing solutions across multiple industries. We can help.
Posted by on 31st May
Oil seals are often called grease, fluid, or dirt seals. These seals close spaces between stationary and moving components in mechanical equipment. Oil seals are designed to prevent the escape of lubricant. They also block contaminants from entering machinery. This is especially important in severe environments where heat and foreign objects may be frequently present. They also prevent the mixing of different mediums like lubricating oil and water.
Oil seals come cataloged as metric oil seals or imperial sized oil seals. The seals can also be custom-made to match the bearings in new types of machinery. They are installed in practically every type of machine including vehicles, protecting all kinds of precision, precisely-fitted ball bearings, sleeve bearings, and roller bearings.
Want more information on oil seal custom? Feel free to contact us.
The oil seal gets its structural stability from an interior metal ring which serves as an inner skeleton. The outer skin is made of a more flexible material like nitrile rubber or other materials based on the physical environment of the seal. A spring on the lip of the seal supports the lip and keeps the lubricant from leaking. The lip construction is what blocks contaminants from outside.
Where loads are light, the outer skin layer can be made of silicone. It can be made of Fluroelastomer (orViton) to protect under high temperatures (more than 120 degrees Celcius). The skin can also be made of Poly Acrylate or Polytetra-FluroEthylene.
The shaft on which the oil seal is mounted has to be ground to a rough surface finish. The shaft also should be hardened to prevent grooves forming on the shaft when the pressure is exerted by the spring on the seal. The area where the seal is fitted also has to be ground to prevent grooves that tend to wear out the lip of the oil seal faster than normal.
Oil seals have a flexible lip that actually rubs against the rotating shaft or housing to prevent leakage. The spring keeps the lip in contact with the shaft. Bearing isolator oil seals are dynamic seals that incorporate a rotor or rotating member and a stator or stationary member. The rotor actually turns with the shaft. Some oil shafts are bearing isolators with a "labyrinth" construction. Others incorporate simpler O-rings.
A patent for an oil seal was filed by Nelson Thomas Edward on August 12, , and published a year later. There were two purposes described. The device was to provide an oil seal between a fixed housing and a rotating part. The seal is described as
made of a yieldable resilient material having flat sealing faces and comprising two ring portions connected together by an annular portion substantially v-shaped in cross-section which may yield or expand as the mounting requires.
The oil seal would seal one face against a rotating member and the other face to a stationary housing. It would prevent dirt from coming between the hub or shaft and the seal.
Early engines used O-rings (also called packing rings or toric joints) as seals (first patented in ). These are just mechanical gaskets in the shape of a torus (a circular ring--like a lifesaver), seated in a groove and compressed during assembly between two or more parts. It creates a seal at the interface. However, O-rings require a fluid film to lubricate them. They have limited usefulness in vacuum application and at extremes of temperature. The modern oil seal represents a significant improvement over the simple O-ring because it effectively seals in lubrication and prevents contamination from outside under a wide range of pressures and temperatures.
If you're looking for quality oil seals, bearings for industry or agriculture, ATV parts, and plenty more, check out The Big Bearing Store. With low prices and same day shipping in most cases, there's no reason to spend time searching the internet when everything you need is all in one place.
Contact us to discuss your requirements of t type oil seal. Our experienced sales team can help you identify the options that best suit your needs.