Mechanical seal is the core component of industrial rotating equipment, which is a type of packing installed on the shaft that transmits power in rotating machinery. The main function is to establish a reliable seal between the shaft and the equipment cavity, prevent medium (liquid, gas, or slurry) leakage, and prevent external impurities and air from entering the equipment interior, ensuring stable operation of the system under harsh conditions such as high pressure, high temperature, and high corrosion, and maintaining equipment pressure.
Mechanical seal is the core component of industrial rotating equipment, which is a type of packing installed on the shaft that transmits power in rotating machinery. The main function is to establish a reliable seal between the shaft and the equipment cavity, prevent medium (liquid, gas, or slurry) leakage, and prevent external impurities and air from entering the equipment interior, ensuring stable operation of the system under harsh conditions such as high pressure, high temperature, and high corrosion, and maintaining equipment pressure. The core of a mechanical seal lies in its sealing interface, where two highly polished surfaces slide relative to each other under the action of fluid pressure and elastic elements, forming tiny gaps to control the formation of a fluid film. This can make the mechanical seal highly reliable and have a long service life. Mechanical seal is an important component in reciprocating compressors.
Sealing usually needs to be carried out under difficult conditions, such as the presence of hazardous substances that may cause environmental problems if leaked to the outside, or the presence of high-temperature, high-pressure fluids that may cause accidents. Although the mechanical seal structure is more complex than the packing seal, selecting the appropriate type according to the purpose and conditions can ensure safety and reliability. The main components are the moving ring, stationary ring, cooling device, and compression spring (depending on the specific equipment), which are divided into single end face and double end face; Balanced and unbalanced types; Arbitrary rotation direction, fixed rotation direction, etc.
It has applications in various fields, such as mechanical and petrochemical factories, food factories, air conditioning cold and hot water pumps, etc.
The specification of mechanical seals usually covers the following core dimensions, which are used to accurately match equipment operating conditions and installation requirements:
1.Basic dimensional specifications: shaft diameter (sealing inner diameter), installation outer diameter/flange size, axial installation length;
2.Applicable specifications for working conditions: pressure range, temperature range, speed range, medium compatibility;
3.Structure and material specifications: structural form, friction pair materials, auxiliary sealing materials, metal component materials;
4.Standards and performance parameters: execution standards, leakage rate indicators, and service life.
1.High sealing reliability: Through the precise fitting and compensation mechanism of the dynamic and static rings, it can adapt to the slight jumping and wear of the shaft, maintain low or even zero leakage for a long time, and meet the safety control requirements of flammable, explosive, toxic and harmful media;
2.Wide applicability: using wear-resistant and corrosion-resistant materials such as hard alloys and silicon carbide, combined with flexible rubber/fluororubber auxiliary sealing, it can adapt to complex working conditions such as strong corrosion, high particle size, high temperature (-50 ℃~450 ℃), high pressure (0~40MPa), etc;
3.Long lifespan and low maintenance: Optimized end face design and lubrication structure reduce friction and wear, significantly extend service life, reduce downtime and maintenance frequency, and lower equipment maintenance costs;
4.Safety and Environmental Protection: Effectively avoiding environmental pollution and safety accidents caused by medium leakage, meeting the high requirements of modern industry for green production and intrinsic safety.
