Reactor with a mechanical seal principle introduced

Mechanical seal is by one pair or several pairs perpendicular to the axis relative to the sliding face in the fluid pressure and compensation institutions elastic ( or magnetic ) to keep under seal affixed to achieve the merger with auxiliary shaft seal leakage resistance device .
Common mechanical seal structure consists of stationary ring ( stationary ring ) 1, the rotating ring ( ring ) 2, the elastic element 3, the spring seat four , set screws 5 , 6 secondary seal rotating ring and the stationary ring seal 8 and other auxiliary components , anti-rotation pin 7 is fixed to prevent the gland 9 stationary ring is rotated . Rotating ring and the stationary ring often also according to whether they have the ability to compensate for axial cyclic or compensation is also referred to as compensation .
Mechanical seal possible leakage of fluid channels are A, B, C, D four channels.
C, D leakage channels are stationary ring and the gland , the gland seal between the housing , the two are static seal .ss cable ties B channel between the rotary shaft sealing ring and , when Friction and wear , it can follow the compensation ring only for a small amount of movement in the axial direction , in fact, still a relatively static seal .
Therefore, these leak paths are relatively easy closure. The most commonly used static sealing rubber O-ring or PTFE V-ring , and as compensation or stationary rotating ring ring ring secondary seal , sometimes using both elastic elements feature rubber, PTFE or metal bellows structures.
A channel is a rotating ring and the stationary ring opposite end faces sliding Lamination dynamic seal , it is the mechanical seal device of the main seal , mechanical seal in determining the performance and life of the key. Thus , the processing requirements of the seal face is high , while the sealing end faces in order to maintain the necessary lubrication film , the system must be strictly the end surface of the cavity pressure per unit area , the pressure is too large, difficult to form a stable lubricating film , will accelerate the end wear ; pressure is too small , increase of leakage . Therefore, to obtain good sealing performance and enough life , in the design and installation of mechanical seals , we must ensure that the pressure per unit area of ​​face value in the most appropriate range.
Mechanical seal with relatively soft packing seal , has the following advantages:
① reliable sealing in a long period of operation, the sealed state is very stable, very small leakage , wire seals according to rough statistics, the leakage is typically only soft packing seal 1/100 ;
② long life in oil, aqueous medium, generally up to 1 to 2 years or more, usually in the chemical medium can be more than six months ;
③ friction small power consumption of the mechanical seal is only soft packing seal friction power of 10% to 50%.