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Kettle Mechanical Seal Structure Features
Mar 23, 2018

Kettle mechanical seal structure features


From the principle of sealing, the mechanical and mechanical seals for the kettle and discharge chutes are the same, but they have unique operating conditions and operating procedures. Therefore, there are some requirements for seal structure design and sealing systems and mechanical seals for pumps. Differences, and have their own characteristics:


1. In-path vibration and axial turbulence of the stirring shaft

The rotary shafts of the tanks and discharge chutes are of vertical structure with large shaft diameters of Φ178 and Φ120 mm and long cantilever. When stirring, the eddy current produced by the material will generate vertical circulation, and therefore, it will generate circulation flow upward and downward. Stirring shaft radial vibration. In addition, the axial thrust generated by the agitation, the axial weight of the agitator shaft due to the self weight of the agitator shaft and the superimposed material pressure cause axial turbulence. These unfavorable factors can easily cause the sealing end surface to adhere poorly, the liquid film is unstable, and sometimes the liquid film is unstable. The soft seal environment cracked, causing the mechanical seal of the reactor to fail.


2. gas seal

Most of the sealed media used in mechanical seals for tanks and chutes are in gas, not liquids, because the contents of tanks are generally not full, and only when the materials are full, they are liquids. Therefore, the working conditions for sealing are harsh. Sealed end faces are often in dry state in the gas phase, causing increased wear on the seal face.


3. change operating conditions

The material undergoes a chemical reaction in the kettle. The temperature and pressure of the material are reduced to high temperatures and pressures, and the temperature and pressure in the kettle are returned to high temperature and high pressure when the new material enters the kettle. Pressure and temperature alternately change repeatedly, which brings disadvantages to the seal. It is easy to cause hydraulic deformation and thermal deformation at the end face of the mechanical seal, resulting in leakage of the seal face. At the same time, repeated changes in temperature and pressure can also easily accelerate the aging deformation of the secondary seal, causing seal failure.


4. seal assembly and disassembly should be convenient

The reactor is generally a vertical device, and its installation form: electric type - reducer - frame - reactor. The mechanical seal is between the flange of the mouthpiece and the coupling of the frame so that when the mechanical seal is replaced, it can be withdrawn from the axial neutral between the two shafts. The mechanical seal of the kettle adopts a container type, which is assembled with flanges, shaft sleeves, short shafts and mechanical seals. It can be overhauled on the outside of the kettle and then directly replaced, so that it can be easily assembled and disassembled. There is no gap between the shaft of the spout shaft and the drive shaft. The mechanical seal is directly mounted on the shaft. There are two thrust bearing supports on the upper end of the seal. When installing or removing, remove the motor and the rack, and then install the mechanical seal. Heavy and bulky, it takes lifting equipment to be able to carry it out. It takes time and labor to install and disassemble mechanical seals.


Contact way:

Susie Ding

Email: susie@jxburgmann.com

Skype: susiecc0523