Pump mechanical seal damage how to do?
Mechanical seal is also known as end seal. It has a pair of end faces perpendicular to the axis of rotation. Under the action of fluid pressure and compensatory mechanical external elastic force, the auxiliary seal relies on the other end to keep fit, and relative sliding, so as to prevent fluid leakage.
Mechanical seal leakage fault is one of the most prone to failure in pump failure, so the water pump mechanical seal also belong to the water pump is one of the key parts in the component, model selection of the water pump mechanical seal material must be appropriate to the user conveying liquid medium, usually gear pump factory are the fluorine rubber mechanical seal, mechanical seal some manufacturer is nitrile butadiene rubber If the corrosion is more serious have to choose the mechanical seal of PTFE material.
Pump mechanical seal damage how to do?
The solution:
- The first possibility of water leakage in the mechanical seal is the wear of the moving and static ring plane of the machine seal. There are six reasons for the plane wear of the dynamic and static ring of the machine seal:
- The installation is too tight. Observe the dynamic and static ring plane of the mechanical seal. If there is serious scorching phenomenon, plane blackening and deep marks, sealing rubber becomes hard and loses elasticity. This phenomenon is caused by too tight installation. Solution: adjust the installation height, after the installation of the impeller, pull the spring with a screwdriver, the spring has a strong tension, release that is reset, there is a 2-4mm moving distance can be.
- The installation is too loose. Observe the machine sealing and static ring plane, its surface has a very thin layer of scale, can be wiped off, the surface is basically no wear, this is caused by the spring loss of elasticity and poor assembly, or the motor axial movement caused by.
- Water contains particles. Due to the poor water quality, containing small particles and high content of carbonate salt in the medium, the formation of abrasive wear machine seal plane or strain surface grooves, ring grooves and other phenomena. Treatment method: improve the water pressure or medium, change the machine seal.
- Dry wear damage caused by water shortage operation. This phenomenon is more commonly seen in the negative pressure at the inlet of the bottom valve installation form, the inlet pipe has air, the air in the pump chamber, after the pump is started, the friction of the machine seal produces high temperature when running at high speed, can not be cooled, check the machine seal, the spring tension is normal, the friction surface is burnt black, and the rubber becomes hard and cracked. Treatment: exhaust the air in the channel and pump chamber, replace the mechanical seal.
- Cavitation erosion. Cavitation mainly occurs in hot oil pump. Because the medium is hot oil, the oil temperature is too high to produce steam, the vapor body in the pipeline into the pump cavity height, this part of the vapor body can not be excluded, resulting in water shortage operation, machine seal dry wear failure, cavitation automatic exhaust valve, replacement machine seal.