Standard Seals Temperature Performance

standard seals Temperature performance

1, the basic concept of mechanical seal:

A mechanical seal means a means for preventing fluid leakage caused by at least one pair of end faces perpendicular to the axis of rotation which are retained and slid under the action of the fluid pressure and the resilient force (or magnetic force) of the compensating mechanism and the auxiliary seal. The auxiliary ring of the compensating ring is called a bellows mechanical seal for metal bellows.

2, the composition of mechanical seals:

There are four main components:

a. The main seal: moving ring and static ring.

b. auxiliary seal: seal.

c. Compressor: spring, push ring.

d. Transmission parts: jumping seat and key or fixed screw.

 Mechanical seal failure and treatment methods are as follows:

 First, the mechanical seal of the failure of the performance on the parts

1, sealing the end of the fault: wear, hot cracking, deformation, damage (especially non-metallic sealing face).

2, spring failure: relaxation, fracture and corrosion.

3, the failure of the auxiliary seal: assembly failure has broken pieces, cracks, bruises, curling and twisting; non-assembled fault deformation, hardening, rupture and deterioration.

Mechanical seal failure in the performance of the performance of vibration, heat, wear, and ultimately the form of media leakage.

Second, the mechanical seal vibration, heat causes analysis and treatment

1, static and dynamic ring and rough.

2, static and dynamic ring and seal the gap is too small, due to vibration caused by the collision. Treatment: increase the diameter of the sealed cavity or reduce the diameter of the rotating body, at least 0.75mm to ensure the gap.

3, sealed cross-section corrosion resistance and poor temperature performance, improper pair of friction pair. Treatment: change the static and dynamic ring material, so that temperature, corrosion resistance.

4, the lack of cooling or cross-section and then installed with particles of impurities. Treatment: increase the coolant pipe diameter or increase the hydraulic pressure.

Third, the mechanical seal leakage analysis and treatment

1, static pressure test leakage

① sealed face installation was bumped, deformation, damage.

② sealed face installation, clean up is not clean, folder with granular impurities.

③ Sealing end face As the positioning screw is loose or not tightened, the gland (static type static ring assembly is the pressure plate) is not pressed.

④ machine, equipment, precision is not enough, so that the sealing surface is not fully fit.

⑤ static ring ring is not compressed or compressed enough or damaged.