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The Agitator Seal Has Good Abrasion Resistance
Jun 21, 2017

First, the application principle

The agitator is sealed, and, in particular, the rotating machine end seal is an axial seal that seals against static and dynamic end face friction pairs by preloading and media pressure and pressing of the resilient element pressure to seal.

(Static ring 1 and movable ring 2), elastic element (spring 4), auxiliary seal (0 ring 8,9), transmission parts (transmission pin 3, drive screw (drive ring 3), the main components of the stirrer are: 6, 7), anti-rotation (reverse pin 10) and fastening (spring 5 and gland 11).

The effect of the agitator seal base element is as follows:

(1) the end of the friction (moving, static ring) to keep tight fit to form a sealing surface to prevent media leakage. Requirements dynamic and static ring with good wear resistance, Agitator Seals dynamic ring can be moved axially, automatically compensate for sealing surface wear, make it And the static ring with a good fit, static ring floating, from the buffer effect.

(2) elastic components (spring, corrugated board, snake-shaped sets, etc.) mainly from the compensation, preload and cushioning effect, but also on the sealing face to produce a reasonable pressure of the factors required to always maintain flexibility to overcome the auxiliary seal and transmission friction , Agitator Seals The starting ring compensation effect. Material requirements corrosion resistance 0

(3) auxiliary seal (0-ring, V-ring, wedge ring and other special-shaped seal ring) mainly play a static ring and dynamic ring seal, but also play a role in floating and cushioning. The sealing element ensures the sealing between the static ring and the gland, so that the static ring has a certain degree of floatability; the moving ring of the auxiliary sealing element ensures the dynamic ring and the seal between the shaft and the sleeve. The material requires heat resistance, Medium close.

(4) Drive (drive pin, drive ring, drive block, drive sleeve, drive key, drive lug or jaw connector), the role of the shaft torque is transmitted to the dynamic ring. Agitator Seals Materials require corrosion and durable.

(5) fastening (set screws, spring seat, gland, assembly sleeve, sleeve) plays a static, moving ring positioning, tightening. Requirements positioning is correct, to ensure that the friction seal surface in the correct position, And to maintain a good fit spring than the pressure; Agitator Seals at the same time require easy disassembly, easy to place, can be reused. With the auxiliary seal should pay attention to the installation of sealing ring chamfering and compression volume, with particular attention to the ring ring and shaft Set with the Department, requiring corrosion and wear resistance, if necessary, the use of hard layer.

The possible leaks of the agitator seal may have three main:

(1) the side of the friction side of the sealing surface of the leakage A, which is the main sealing surface, determine the mixer seal friction and sealing performance

Of the key, but also determine the working life of the agitator seal.Therefore, the requirements of the contact surface is very high, roughness requirements close to the mirror, flatness to be 0.O009mm. For different media, require the use of appropriate friction material combination, Pay attention to wear resistance, corrosion resistance, use the appropriate geometric parameters (load factor, width ratio, etc.) and performance parameters (specific pressure, spring, pressure ratio, etc.).

(2) static ring and gland of the static ring seal leakage and dynamic ring and shaft (sleeve) of the dynamic ring seal leakage D, is the auxiliary sealing surface, Agitator Seals determine the seal of the stirrer seal and dynamic ring floating The key, especially the ring and the shaft (sleeve) of the sealing surface, should first prevent the corrosion of scale or chemical reaction material accumulation caused by moving ring "hold" (not bomb).

(3) static seal of the gland and the sealed box C and the static seal E of the shaft and the shaft, both of which are static sealing, can be used according to the sealing medium compatible materials.In addition, the movable ring such as the use of mosaic structure, May also be in the mosaic surface with a leak, must pay attention to the coordination of the place.

Second, the characteristics

The seal of the stirrer seal is much smaller than the packing seal, generally 0.O1 ~ 3mL / h.

The agitator seal is a rotary shaft seal, or a rotating mechanical end seal, which appeared in the UK as a patent in 1885 until the start of the year 1900. For the refrigeration unit in 1920, it was used as a bearing seal, The use of the seal is very low. Until 1930 began for the internal combustion engine pump .1939 ~ 1945, due to the development of petrochemical and materials appear graphite, ceramic, carbide, Agitator Seals processing technology in the surface roughness, the use of parameters The former Soviet Union in the mid-50s will be used to seal the mixer used in the refinery centrifugal pump, in China's Lanzhou, the United States, the United States and the United States, Refinery construction, the centrifugal oil pump with a stirrer seal.China's 60's self-made blender sealed and promote the use of other refineries are also one by one to promote and make use .In the mid-60s, in the introduction of platinum reforming Almost all of the device using a stirrer seal, which the refining industry, the development of agitator sealing technology has been a great help.With China's oil Chemical industry development, the factories and mines, the school, have been on the agitator seal in-depth study, China has its own mixer seal series, professional manufacturers up to nearly one hundred, but the stirrer sealed in the structure, Materials and ancillary measures are still constantly evolving and updated.

From the selection, operation and maintenance point of view, there are four key issues. That is the choice of structural type; sealing components of the material selection; sealed cavity lubrication, washing and cooling of the normal operation;