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　　Mechanical seal Foundation
　　Mechanical seal because of its good sealing performance, stable operation, low leakage, low friction power consumption, the use of long cycle, the shaft wear is very small, and can meet the requirements of a variety of conditions, so it is widely used. But the structure is more complex, the manufacturing precision is high, the price is expensive, the maintenance is inconvenient.
　　Principle and composition:
　　Mechanical seal is also known for the seal, it has at least a pair of perpendicular to the axis of rotation of the face, the face under the role of fluid pressure and compensation of external mechanical forces (or magnetic), coupled with the auxiliary sealing, and another end remain attached with relative sliding, thereby preventing leakage of fluid. Due to the tight joint of the end face, the seal between the face form a tiny gap, when the medium through the gap and form thin film, resulting in resistance to prevent leakage, and lubricant end face, long sealing effect.
　　Basic composition:
　　Still rings and rotating rings (rings and rings), usually for the grinding surface, also known as the friction pair.
　　Supplementary buffer mechanism based on elastic elements.
　　Auxiliary sealing ring
　　The drive parts that make the moving ring and the shaft rotate together.
　　Classification of mechanical seals
　　Classification by application:
　　According to the equipment can be divided into pumps, reactors, centrifuge, wind machine, submersible pump motor, a freezer, internal combustion engine, cooling water pump, ship use pumps and other.
　　Classification according to the principle of action:
　　The logarithm of the seal face: single end face, double end face, and multi end face. The double end face is divided into two axial and radial double ends.
　　In accordance with the role of sealing fluid pressure in the face of the unloading or non unloading can be divided into: non - balanced, partial balance, full - balanced.
　　In accordance with the rest of the ring is installed in the inner or outer surface of the sealing surface, into the internal and external.
　　The spring is arranged in the fluid as a spring, and the external form of the spring is divided into single spring type and multi spring type according to the amount of the compensation mechanism.
　　According to whether the elastic element with the axis of rotation into rotary, stationary mechanical seal.
　　The leakage direction of the sealing fluid in the seal face is the same as that of the axial rotation of the centrifugal direction.
　　In accordance with the seal face direct contact and non contact type mechanical seal and vice versa for the non contact type, it can be for hydrostatic pressure and fluid dynamic pressure.
　　According to whether the bellows can be classified as non corrugated tubular bellows type, which in turn can be classified as metal corrugated tube, PTFE bellows, rubber corrugated pipe several.