1. the basic concept of the mechanical seal:
Mechanical seal means at at least one end surface perpendicular to the axis of rotation under fluid pressure and the force of the correction means (or magnetic), and the role of the secondary seal is held in abutment with the combined relative sliding means to prevent fluid leakage. Secondary seal ring is called compensation bellows mechanical seal is a metal bellows.
2. the mechanical seal consists of:
There are four main parts. a primary seal: ring and stationary ring. b auxiliary seals: seals. c pressing member: spring, pushing the ring. d transmission parts: Kei seat shells and keys or set screws
Normal operation and maintenance
1, preparations and precautions before starting
a, a comprehensive inspection of mechanical seals, and ancillary equipment and piping installation is complete, meets the technical requirements.
b, before starting a static test of mechanical seals, mechanical seals to check for leaks. If the leak is more, should try to find out the reason for cancellation. If still valid, you should check the disassembly and re-installation. General hydrostatic test pressure for 2 to 3 kg / cm.
c, by pump rotation plate car, check whether light evenly. If the disc does not move when the car difficult or, you should check whether the size of the assembly error, the installation is reasonable.
2, installation and decommissioning
a, should remain sealed before starting the cavity filled with liquid. When solidified medium for conveying applications vapor seal chamber heated to melt the media. Before starting the car must drive to prevent sudden start caused by soft ring fragmentation.
b, pump mechanical seal for use outside the seal oil system, you should start the seal oil system. After stopping the last stop seal oil systems.
c, the heat pump outage can not stop immediately and face seal seal oil chamber cooling water should be dropped when the face seal of the oil below 80 degrees, it can stop the cooling water to avoid damage to the sealing parts.
3, running
a, the pump starts if slight leakage, should be observed for a period of time. If four hours of continuous operation, the leakage is still reduced, you should check the pump stops.
b, the operating pressure of the pump to be stable, the pressure fluctuation is less than 1 kg / cm.
c, pump operation, the phenomenon should avoid taking the time to avoid dry friction and sealing sealing surface damage.
d, the situation should always check the seal. In operation, when the leakage exceeds the standard, heavy oil is not more than 5 drops / min, light oil is not more than 10 / min, such as 2-3 days, still no signs of improvement, the pump should be stopped to check the sealing bolt means.
Sealed "in the long history of China's development, the ancients have used cotton, hemp and other fibers do mechanical seals for water, and in 1782 was foreign to the use of fillers. Importance sealed, not much to say here and now abroad has Research the law appears sealed, the sealing device design technology and application of scientific principles of discipline - "Sealed science", research institutions have specialized sealing science curriculum, while in China, so far, to my knowledge, the university has a fluid mechanical and hydraulic transmission and other courses, but there is not a dedicated research sealed "sealed system", so our level of research compared with other countries, still have gaps.
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