Customer service personnel for maintenance of the process, a considerable part of the problem is the leaking equipment. Variety of equipment leakage phenomenon, mainly mechanical seal leakage. This paper describes mechanical seal leakage is hereby causes and treatment.

Mechanical seal leakage of water at the first possibility is that machine closures of the dynamic and static wear ring plane. Caused by mechanical seal of the dynamic and static wear-ring plane because there are six areas:

One reason to install too tight. Observe the movement of mechanical seal ring plane, where the phenomenon seriously burned, flat and deep black marks, sealing rubber hardens, loss of elasticity, this phenomenon is caused by the installation of too tight. Approach: Installation height adjustment of the impeller installed, Stubbs spring with a screwdriver, a strong spring tension, release after reset, there are 2-4MM to the moving distance.

Second reason, the installation is too loose. Observed mechanical seal dynamic and static ring plane, the surface with a thin scale, to wipe the surface almost no wear, the spring loses its elasticity and it is caused by poor assembly, or motor causes axial movement.

Three reasons, including poor water quality grain. Because of poor water quality, with small particles and high salt content of hydrochloric acid medium to form abrasion machine seal groove surface of flat or strained, ring ditches and so on. Approach: to improve water pressure or media, replace the mechanical seal.

Four reasons, running water damage caused by dry grinding. This phenomenon was particularly prevalent in the form of the end of the inlet valve mounting negative pressure, an air inlet, an air pump chamber, pump power, the mechanical seal of the friction heat generated when high-speed operation can not be cooled, check the mechanical seal, spring tension normal friction surface charred black, rubber hard cracking. Approach: Pai Road and although the air pump chamber, the replacement of mechanical seals.

Five reasons, cavitation. Cavitation arising primarily from the heat pump. Because the medium is hot water, high temperature steam, the vapor inside the tubes into the pump cavity height, this part of the vapor can not be excluded, resulting in water running, dry grinding mechanical seal failure, cavitation as automatic scheduling valve, the replacement of mechanical seals.

Six reasons, the assembly problem. Install the pump cover, may not be installed flat, causing the vertical axis and the pump cover is not caused by movement plane can not match, the boot time is not long, wear and tear caused by water seepage side. Movement may also install the ring, the rubber is damaged, or static ring surface bumps. Approach: removal of heavy equipment, check the pump cover is installed level.

Water Leakage in mechanical seal at the second possibility is mechanical failure of sealant.

Mechanical Failure sealants: rubber aging, deformation, mainly in the aging heat pumps, deformation. The performance of mechanical seal failure phenomenon of plastic water temperature is too high, medium dissolved rubber. From the exterior view of rubber surface loose, rough, loss of elasticity, so that the rubber failure. Approach: replacement for the rubber material.

Mechanical seal leakage of water pump cover third possibility is causing static ring chamber.

Mainly due to static ring indoor Holes error, the surface rough. The phenomenon of the performance of water from the axial, static ring and the gap between the inner hole or rough inner hole, the static rings with the switch, rubber wear. Approach: replace the pump cover. Wrapped with Teflon tape or stationary ring outer ring, or add sealant for emergency treatment.

Water Leakage in mechanical seal at the fourth possibility is that the motor crankshaft machining accuracy, small size, roughness and the journal corrosion. Mainly due to the motor journal (put ring at) processing, small size, or due to corrosion of pumping corrosive media, as well as for a long time disabled, water as medium, steel shaft and impeller castings, pump cover different electrode potential to form a galvanic cell reaction, resulting in corrosion of the journal. Corrosion performance of the surface phenomenon is spotted.

Approach: the surface rust with sandpaper polishing, winding with the raw material after processing into the ring for the emergency, the best way is to change axis, or shaft mounting sleeve and processed back to the size of the original shaft.

What are the mechanical seal failure? How to deal with? Mechanical seal failure and treatment methods are as follows:

A mechanical seal failures on the part of the performance:

1, the seal face of failure: wear, thermal cracking, deformation, damage (especially non-metallic seal faces.)

2, spring failure: relaxation, fracture and corrosion.

3, the auxiliary seal failure: failure of the assembly of a swap block, cracks, bumps, curling and distortion; assembly of non-fault deformation, hardening, cracking and deterioration.

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

Second, the mechanical seal vibration, Analysis and treatment of fever

1, the static rings face rough.

2, the dynamic and static sealing chamber ring and the gap is too small, due to runout caused the collision. Treatment: Increase or decrease the diameter of the sealed chamber diameter rotating parts, or at least ensure that the gap 0.75mm.

3, the seal face poor corrosion resistance and heat resistance, friction match properly. Treatment: Change the static ring material, to temperature, corrosion-resistant.

4, inadequate cooling or face particles in the installation folder with impurities. Treatment: Increase coolant or increase the hydraulic pipe diameter.

Third, the mechanical seal and Treatment of Leakage

1, the static pressure leak test

(1) Seals to be bumps installed, deformation, damage.

(2) Seals installation, clean up dirty, there are the granular impurities.

(3) Seals screws loose or is not as tight, gland (the static stationary ring components for the plate) is not compressed.

(4) machinery, equipment, lack of precision, so that the sealing surface is not fully fit.

(5) static and dynamic compression ring or compression ring is not inadequate or damaged.

(6) V-ring seals the direction of movement upside down.

(7) If shaft leakage, seal sleeve assembly is not enough compression or compression or damage. Approach: to strengthen the inspection assembly, cleaning, in strict accordance with technical requirements of the assembly.