Self-priming sewage pump 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 water pump factory are some manufacturer is nitrile butadiene rubber fluorine rubber mechanical seal mechanical seal, if the corrosion is serious to choose four fluorine material mechanical seal.

Solution:

1. The first possibility of leakage in mechanical seal is machine seal movement and static ring plane wear. There are six reasons for machine seal movement and static ring plane wear:

2. The installation is too tight. Observe the mechanical seal of the static ring plane, if there is serious charred phenomenon, the plane is black and deep trace, the seal rubber becomes hard, lose the elasticity, this phenomenon is due to the installation of tight. Treatment: adjust the installation height. After the impeller is installed, use the screwdriver to pull the spring. The spring has a strong tension, and when it is released, it will be reset, and it will be able to move about 2-4mm.

3. Installed loose. Observe the machine moving and static ring sealing surface, the surface has a very thin layer of scale, can wipe, basic no wear surface, which is caused, poor lose elasticity and spring assembly or motor axial channeling move.

4. Water quality difference contains particles. Due to the poor quality of water, high salt content in small particles and medium, the surface of abrasive abrasion machine sealing surface or the surface of the pull surface produce groove, ring groove and other phenomena. Treatment method: improve water pressure or medium, change machine seal.

5. Dry mill damage caused by water shortage operation. This phenomenon found in the bottom valve type installation forms inlet negative pressure, there is air inlet pipe, inside the pump chamber, air pump after startup, friction generated when the high-speed operation of high temperature by the machine and to cool, check machine, spring tension is normal, the friction surface burning black, rubber harden craze. Treatment: although the channel and pump chamber air, replace mechanical seal.

6. Cavitation. Cavitation mainly occurs in hot water pumps. Since the medium is hot water, the water temperature is too high to produce steam pipe of the gas entering the pump cavity, this section of the vapour cannot be ruled out, resulting in lack of operation, machine sealing failure, dry grinding cavitation automatic exhaust valve, a replacement.

• Print
• Close This Page
• Recommendation：
• 
• Browse：