October 22, 2020
The axial movement of the pump rotor is large
Under the action of fluid pressure and compensating mechanical external elastic
force, the end face relies on the cooperation of the auxiliary seal to keep fit
with the other end, and relatively slide, thereby preventing fluid leakage. The axial movement of the pump rotor is large, the
auxiliary seal and the shaft have a large interference, and the moving ring
cannot move flexibly on the shaft.1mm, and the interference between the
auxiliary seal and the shaft should be moderate.
After the pump is turned over
and the moving and static rings are worn, the displacement cannot be
compensated.While ensuring the radial seal, the movable ring can be
flexibly moved on the shaft after assembly ( Press the moving ring against the
spring to spring back freely).　　 Countermeasures: The above problems can be
corrected according to the maintenance standards. Countermeasures: When
assembling the mechanical seal, the axial movement of the shaft should be less
than . The main positions of the grinding shafts are as follows: moving ring
auxiliary sealing ring, static ring position, A few springs have shaft grinding.
Some have rotted and lost their proper function, resulting in the phenomenon of
shaft grinding.　　
Countermeasures: The height of the lubricating oil surface in
the oil chamber cavity should be higher than the sealing surface of the dynamic
and static rings. Due to the corrosion of the weak acid and weak alkali of the
moving and static ring auxiliary seals, the rubber parts have no elasticity. The
operation of mechanical seals directly affects the normal operation of pumps.
The summary analysis is as follows. The main part of the grinding shaft is a
rubber bellows, and because the upper sealing surface is in a poor lubrication
state, the friction torque between the moving and static rings is greater than
the transmission torque between the rubber bellows and the shaft, and relative
rotation occurs.
When using mechanical seals, various factors of using
mechanical seals should be analyzed, so that the mechanical seals are suitable
for the technical requirements and medium requirements of various pumps and have
sufficient lubrication conditions, so as to ensure long-term and reliable
operation of the seal. Insufficient lubricant on the sealing surface causes
dry friction or roughness on the sealing end surface.The main reasons for
shaft grinding: BIA type double end face mechanical seal, the back pressure
state is a bad working condition, particles and impurities in the medium can
easily enter the sealing surface and cause the seal to fail.
The reason is the
misalignment of the stator and the upper and lower end caps or the imbalance of
the impeller and the main shaft, cavitation or bearing damage (wear), this
situation will shorten the seal life and cause leakage.The rotor vibrates
periodically. It has a pair of end faces perpendicular to the axis of rotation.Shaft grinding phenomenon caused by seal leakage of small submersible pumps The mechanical seal failure of small pumps below 715kW often produces
grinding shafts. Common leakage phenomena The leakage of mechanical seals
accounts for more than 50% of all repaired pumps. A mechanical seal is also
called an end face seal.The mechanical seal itself is a demanding PTFE
coated adhesive tapes precision component, which has high requirements on
design, machining, and assembly quality.
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October 14, 2020
Such bonding is generally solved by bonding or welding
After the problems of bonding and welding are solved, PTFE will surely have more advantages in the field of anti-corrosion. However, because PTFE material itself has extremely high chemical stability and non-stickiness, its bonding and welding are more troublesome, which has always been a major problem in the application of PTFE materials. Introduction to the welding methods of polytetrafluoroethylene (PTFE) With the rapid development of modern industry, the problem of material anti-corrosion has attracted widespread attention from all over the world.
With the advancement of scientific research methods and production processes, new adhesives, bonding processes and welding methods suitable for bonding and welding of PTFE materials will continue to appear. Introduction PTFE fiberglass adhesive tapeto the commonly used bonding methods of polytetrafluoroethylene (PTFE) 2.With the advancement of anti-corrosion technology, anti-corrosion materials are constantly being introduced. Such bonding is generally solved by bonding or welding.
It can be used alone or in combination with other materials, such as combined with stainless steel. However, in specific applications, the problem of mutual bonding between materials is involved, including between PTFE and PTFE and between PTFE and stainless steel. Among them, polytetrafluoroethylene (PTFE) has attracted more and more attention due to its excellent chemical stability, high temperature resistance and chemical corrosion resistance. It is an ideal anti-corrosion material.
It is currently one of the most widely used and best-effect materials in industrial anti-corrosion. In a large number of anti-corrosion production practices, PTFE has been adopted by many enterprises due to its unique properties. Based on experience, we will introduce several commonly used and effective methods of bonding and welding PTFE workpieces.
The latter can not only exert FITE's unique anti-corrosion properties, At the same time, the high strength of stainless steel can be used, which can avoid the shortcomings of low strength of FITE and poor anti-corrosion ability of stainless steel, which plays a good role in promoting strengths and avoiding weaknesses.
After solving the problems of bonding and welding of PTFE, the application of PTFE as an anticorrosive material in industrial production will be more extensive. , Has become one of the indispensable important materials today. Big deed. As a special anti-corrosion material, PTFE mostly appears in the form of workpieces in daily applications
Posted by: meshbelt at
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