Mechanical seals and wear characteristics

Mechanical seal is to rely on the elastic element static and dynamic preload ring face seal pair and media pressure and the pressure of the elastic element to achieve the axial face seal compression device. General sub-contact and non-contact mechanical seal mechanical seal two categories. Mechanical seal has the following six characteristics: inconvenient disassembly complex structure, long life, good vibration resistance, high sealing pressure, without adjustment operation (a spring and fluid pressure), the amount of leakage can be restricted to very few.

Mechanical seal includes a seal head and seal seat. Sealing head: sealing head is a resilient member so that the main seal ring for axial displacement follow the pairing of the metal seals ring component, which is called sealing head .2 sealing seat is inelastic components pairing seal ring assembly.

Classification of the mechanical security seals

Mechanical seal a variety of classification, according to different sub-law may be distinguished following.

According to the sealing head mechanical seal installation location can be divided into: built-in mechanical seals and externally mounted mechanical seals;
Mechanical seal according to the structure and arrangement of the elastic member of: single spring mechanical seals, multi-spring mechanical seals, bellows mechanical seal, diaphragm, etc.;
According to the sealing surface and the amount of the sealing head can be divided into: single mechanical seal and double mechanical seal;
Press the role of media in the sealed end surface pressure unloading were divided into: balanced and unbalanced mechanical seal mechanical seal.

Wear of the mechanical seal:

There are five points:
(A) mechanical seal erosion (brush) Wear: As high-speed flow of liquid or gas produced denudation caused;
(2) mechanical seal surface fatigue wear: sliding surface fatigue cracks and cracks caused by thermal stress.
(3) Mechanical seal abrasive wear: Due to chemical corrosion caused by the gap most likely to occur when temperatures are high such wear and tear;
(4) Mechanical seal abrasive wear: two rough surface of crushed cut effects or because the sealing cracks in charge of foreign debris caused by abrasive done;
(5) mechanical seal adhesive wear: Two sliding friction material surface forces attract each formed;