There are many reasons for the leakage of the water pump, mainly because of leakage of the mechanical seal. Shanghai Shangjiu Pump Co., Ltd. gives you a detailed introduction to the cause of leakage of the mechanical seal of the pump and its solution.
Mechanical seal overview:
Mechanical seals are also called end face seals. They have a pair of end faces perpendicular to the axis of rotation. Under the effect of fluid pressure and compensation of the external elasticity of the machine, the end face relies on the fit of the auxiliary seal to keep fit with the other end and slide relatively to prevent fluids. leakage.
Cause 1. During the test run, the pump was not filled with water, or the water supply was started without external water supply to the machine, or the pump was operated without water.
Inspection method: remove the pump check. Observe and check the damage of the mechanical seal.
State features: Cracks in the moving or stationary ring of the mechanical seal or signs of melting in the rubber seal.
Treatment method: Replace the mechanical seal and train the correct method of operation.
Reason 2: The machine seal is installed too tightly or too loosely. Check method: Check the pump and observe the damage of the mechanical seal.
State characteristics: The wear surfaces of the mechanical and static rings of the machine seal are partially worn or worn (only semi-circular) or dirt and the two friction surfaces are marked with some lines (circles). If the general pump is leaky, it is just a debugging operation. It may be that the two friction surfaces of the moving and static two rings are not worn or scratched. Check that the spindle is large.
Treatment method: check the mechanical seal, static ring, if no grinding, scratches, can be re-installed adjustment. If the mechanical seal and static ring have been scratched or scratched, replace the new seal. Check whether the length of the sleeve meets the requirements, or whether the seals of the machine-enclosed wave tube or O-ring are too loose, too large and not up to specification. Check the cause of the big spindle turbulence. Damaged bearings, replacement of bearings; bearing covers, suspensions, spindles and other related dimensions have errors, replacement of poorly-sized parts.
Cause 3: The liquid contains particles. Check method: Understand the liquid condition (with or without debris, etc.). Remove the pump and inspect and inspect the mechanical seal for damage.
State characteristics: There are debris in the seal chamber of the pump, or sediment or welding slag. Damage to the machine seal (damage of the fluid tube or wear of the stationary ring and moving ring friction surface).
Treatment method: There are debris in the pump chamber and seal chamber, welding slag or sand, etc., will cause damage to the machine seal, must replace the machine seal.
Cause 4: The type selection is incorrect (the machine seal that is suitable for the use condition is not selected according to the use requirements, especially the environment in which the corrosive liquid is transported).
Inspection method: Learn more about pumping liquid composition, temperature, and corrosion. Remove the pump and inspect and inspect the mechanical seal for damage.
State characteristics: The wave tube and other seals are deformed, deteriorated or melted. There may be grinding in the friction surfaces of the moving and stationary rings (especially if the use time is long, and the time is short, there may not be grinding).
Treatment method: According to the liquid temperature, composition, corrosive re-select the appropriate conditions for the machine seal.
Reason 5, the quality of the mechanical seal inspection method: remove the pump to check the main key dimensions of the parts to see which parts are not qualified.
State characteristics: When the spring is deformed, one end of the spring is placed on the platform surface, and the other side of the spring has a large difference in height. The static and dynamic rings shall be coated with clean red dan. The two mating surfaces shall be put together. Turn them with a little force and study a few times. Then separate them to check whether the two planes are in good contact. If there are any defects, the plane will have some Local contact, some of the non-contact remains reddish. Dynamic and static rings are matched by the same material, and the contact surfaces of the two friction surfaces are too large, causing the dynamic and static rings to bond together.
Processing method: If there are parts that need to be replaced, they will be replaced immediately; if there are no replacement parts, the whole set will be replaced.
Mechanical seal overview:
Mechanical seals are also called end face seals. They have a pair of end faces perpendicular to the axis of rotation. Under the effect of fluid pressure and compensation of the external elasticity of the machine, the end face relies on the fit of the auxiliary seal to keep fit with the other end and slide relatively to prevent fluids. leakage.
Cause 1. During the test run, the pump was not filled with water, or the water supply was started without external water supply to the machine, or the pump was operated without water.
Inspection method: remove the pump check. Observe and check the damage of the mechanical seal.
State features: Cracks in the moving or stationary ring of the mechanical seal or signs of melting in the rubber seal.
Treatment method: Replace the mechanical seal and train the correct method of operation.
Reason 2: The machine seal is installed too tightly or too loosely. Check method: Check the pump and observe the damage of the mechanical seal.
State characteristics: The wear surfaces of the mechanical and static rings of the machine seal are partially worn or worn (only semi-circular) or dirt and the two friction surfaces are marked with some lines (circles). If the general pump is leaky, it is just a debugging operation. It may be that the two friction surfaces of the moving and static two rings are not worn or scratched. Check that the spindle is large.
Treatment method: check the mechanical seal, static ring, if no grinding, scratches, can be re-installed adjustment. If the mechanical seal and static ring have been scratched or scratched, replace the new seal. Check whether the length of the sleeve meets the requirements, or whether the seals of the machine-enclosed wave tube or O-ring are too loose, too large and not up to specification. Check the cause of the big spindle turbulence. Damaged bearings, replacement of bearings; bearing covers, suspensions, spindles and other related dimensions have errors, replacement of poorly-sized parts.
Cause 3: The liquid contains particles. Check method: Understand the liquid condition (with or without debris, etc.). Remove the pump and inspect and inspect the mechanical seal for damage.
State characteristics: There are debris in the seal chamber of the pump, or sediment or welding slag. Damage to the machine seal (damage of the fluid tube or wear of the stationary ring and moving ring friction surface).
Treatment method: There are debris in the pump chamber and seal chamber, welding slag or sand, etc., will cause damage to the machine seal, must replace the machine seal.
Cause 4: The type selection is incorrect (the machine seal that is suitable for the use condition is not selected according to the use requirements, especially the environment in which the corrosive liquid is transported).
Inspection method: Learn more about pumping liquid composition, temperature, and corrosion. Remove the pump and inspect and inspect the mechanical seal for damage.
State characteristics: The wave tube and other seals are deformed, deteriorated or melted. There may be grinding in the friction surfaces of the moving and stationary rings (especially if the use time is long, and the time is short, there may not be grinding).
Treatment method: According to the liquid temperature, composition, corrosive re-select the appropriate conditions for the machine seal.
Reason 5, the quality of the mechanical seal inspection method: remove the pump to check the main key dimensions of the parts to see which parts are not qualified.
State characteristics: When the spring is deformed, one end of the spring is placed on the platform surface, and the other side of the spring has a large difference in height. The static and dynamic rings shall be coated with clean red dan. The two mating surfaces shall be put together. Turn them with a little force and study a few times. Then separate them to check whether the two planes are in good contact. If there are any defects, the plane will have some Local contact, some of the non-contact remains reddish. Dynamic and static rings are matched by the same material, and the contact surfaces of the two friction surfaces are too large, causing the dynamic and static rings to bond together.
Processing method: If there are parts that need to be replaced, they will be replaced immediately; if there are no replacement parts, the whole set will be replaced.
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