Analysis and treatment of vibration and heat of mechanical seal
1. The end face of the dynamic and static ring is rough.
2. The gap between the stationary ring and the sealing cavity is too small, and the vibration caused by the pendulum is caused by the collision. Treatment methods: increase the inner diameter of the seal cavity or reduce the outer diameter of the rotating parts, at least ensure the clearance of 0.75mm.
3, the cooling is not enough or the end face is fitted with particulate matter when it is installed. Treatment: increase the pipe diameter of the coolant or improve the hydraulic pressure.
4, the seal end face corrosion resistance and temperature resistance are bad, and the pairs of friction pairs are mismatched. Treatment method: change the dynamic and static ring material to make it warm and corrosion resistant.
The first possibility of the leakage of water in the mechanical seal is the plane wear of the moving and static ring plane. There are six reasons for the cause of the wear of the dynamic and static ring plane.
One reason, the installation is too tight. Observe the mechanical seal's dynamic and static ring surface, such as serious burning phenomenon, plane blackening and deep traces, seal rubber becomes hard and lose elasticity, this phenomenon is caused by tight installation. The way of treatment is to adjust the installation height. After the impeller is installed, pull the spring with the screwdriver. The spring has stronger tension. After loosening, it is reset, and has the moving distance of 2-4MM.
Cause two, the installation is too loose. It is observed that there is a thin layer of scale on the surface of the machine, which can be erased and the surface is basically free from abrasion. This is caused by the loss of elasticity and improper assembly of the spring, or the axial movement of the motor.
The three reason is that the dry grinding damage is caused by the water shortage. This phenomenon is more common in valve mounted form inlet pressure, inlet air, air cavity pump, pump boot, high temperature friction high speed mechanical seal, can not be cooled, check sealing machine, spring tension, friction surface charred black, rubber hard crack. Treatment methods: exhaust pipe and pump cavity air, replace mechanical seal.
Cause four, cavitation. The cavitation is mainly produced in the hot water pump. Because the medium is hot water, the water temperature is too high to generate steam, and the steam inside the pipeline enters the high position of the pump cavity. This part of the steam body can not be excluded, resulting in water shortage operation. The machine seal is dry and worn out, and the automatic exhaust valve is installed on the cavitation, and the machine seal is replaced.
Reason five, assembly problem. When installing the pump cover, there may be no leveling, causing the shaft and pump cover not vertical, causing static and dynamic planes to not match, and the start-up time is not long, resulting in unilateral wear and seepage. It is also possible to damage the rubber parts or the surface of the static ring when the moving and static ring is installed. Treatment: remove heavy load, check whether the pump cover is flat.
The six reason is that the water quality is not particles. Because of poor water quality, the content of small particles and the content of salt in medium is high, and the formation of groove and ring groove on the surface of the abrasive wear machine is formed or on the drawing surface. Treatment methods: improve water pressure or medium, replace machine seal.
Two. The second possibility of leakage of the mechanical seal is the failure of mechanical sealant.
The cause of failure of mechanical sealant: the aging and deformation of the rubber parts is mainly the aging and deformation of the hot water pump. The phenomenon of mechanical sealant failure is that the water temperature is too high and the medium dissolves rubber. Loss of flexibility rubber surface loose, rough, from the appearance, so that failure of rubber. Treatment: replace the suitable rubber material.
Three, the third possibility of leakage of water in the mechanical seal is caused by the static ring chamber of the pump cover.
The main reason is the static ring interior hole size error processing surface. The phenomenon is from the axial water jet, the gap between the static ring and the inner hole, or the inner hole is rough, the static ring heel and the rubber wear. Treatment: replace the pump cover. Or with the raw material belt winding static ring outer ring, or encrypt sealing glue for emergency treatment.
Four. The fourth possibility of water leakage at the mechanical seal is the poor machining precision, small size, rough and rusty neck of the shaft neck. The main reason is that the motor shaft (put ring at) the small dimension, or due to corrosive medium corrosion pump, as well as the long time stopped, water as the medium, the electrode potential of steel castings, pump shaft and impeller cover, forming primary cell reaction caused by shaft corrosion. The appearance of the phenomenon is the spot on the surface of the corrosion.
Approach: the corrosion surface with sandpaper polish, wrapping with raw materials, into the ring for emergency treatment, the best way is to change the shaft or shaft bushing after processing and restored to the original size of the shaft.
What are the failures of mechanical seals? How to deal with them? The failure and treatment of mechanical seals are as follows:
1. The performance of mechanical seals on the parts:
1. The failure of the seal face: wear, thermal cracking, deformation and breakage (especially the non metal seal face).
2. The failure of the spring: relaxation, fracture and corrosion.
3, auxiliary sealing ring failure: assembly failures include falling blocks, cracking, bumping, curling and twisting. Non assembly failures include deformation, hardening, cracking and deterioration.
The mechanical seal fault appears in the form of vibration, heat and wear in operation, and finally in the form of medium leakage.
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