Overview of mechanical seals:
Mechanical seal, also known as end face, a pair of perpendicular to the axis of rotation of the face, the face under the role of fluid pressure and compensation mechanical stretch dependent auxiliary seal fit with the other end of the stay fit, and relative sliding, thereby preventing the leakage of the fluid.
1. reasons, the trial operation is not first filled with water or water from the outside of the pump is not the first to open the pump to run the pump, or the use of water running in the process.
Inspection method: check the pump. Inspection and inspection of mechanical seal damage.
State characteristics: the mechanical seal of the dynamic ring or static ring there is a crack or rubber seal parts with signs of melting.
Processing method: replace mechanical seal, cultivate the correct operation method.
2. mechanical seal installation is too tight or loose
Inspection method: remove the pump inspection, inspection and inspection of mechanical seal damage.
Characteristics: mechanical seal of the dynamic and static ring two mating surfaces are part of whet flower or wear scar (only half part) or dirt to friction surface draw some lines (circle). Generally open the pump that is, if only the commissioning of the test run, may be moving, static two ring of the two friction surface without grinding flowers and scratches. Check the main shaft to move large.
Processing method: check the machine seal of the dynamic, static ring, if no grinding flowers, scratches, can be re installed adjustment. If the machine is sealed, the static ring has been worn or there are scratches, the replacement of the new machine seal. Inspection sleeve length of whether it meets the requirements, the wave pipe or O type circle or mechanical seal seal is too loose, too large, substandard. Check the cause of the main shaft. Bearing damage, replacement of bearings; bearing cover, suspension, etc. the spindle size error, replace the size difference of parts.
3. liquid containing particles
Inspection methods: to understand the situation of the liquid (with no debris, such as sand and silt, etc.). Check the pump, observe and inspect the mechanical seal.
Status features: pump seal cavity with debris, or sediment or slag, etc.. Machine sealing damage (liquid pipe damage or static ring, dynamic ring friction surface wear).
Treatment methods: the pump cavity and the sealing cavity with debris, welding slag or sand, etc., will cause damage to the machine, the machine must be replaced.
4. the selection is not (not based on the use of the requirements of the use of suitable for the use of mechanical seals, especially the use of corrosive liquid transport environment).
Inspection methods: a detailed understanding of liquid composition, temperature, corrosion resistance. Check the pump, observe and inspect the mechanical seal.
State characteristic: the deformation, metamorphism and melting of the seal such as the wave grade pipe. Dynamic and static ring friction surface may be grinding flowers (especially the use of a long time, time is not necessarily a short time to wear).
Processing method: according to the temperature of the liquid, the composition, the corrosion to select the suitable condition of the machine seal.
5.the quality of the machine itself.
Inspection methods: the pump inspection machine to seal the main parts of the key dimensions, to see which parts size is not qualified.
When the spring is deformed, the spring is placed on the face of the platform, and the other side of the spring is different from the other side of the spring. , static ring two matched painted face some clean Hongdan, two matched surfaces are combined together, the hand with a rotation, to research a few, separately, and then, check two plane contact is good, if bad is plane will contact with some local, some do not contact remains Hongdan color. Dynamic and static ring of the same material matching, two with the friction surface is too large, resulting in dynamic and static ring bonded together.
Processing method: there is a need to replace the parts, it is immediately replaced; if there is no replacement parts, the whole set of replacement.
