Double-end face mechanical sealing device

Abstract

The present invention relates to the field of mine and thermal power generation mechanical equipment, and provides a double-end face mechanical sealing device. The device comprises a sealing seat, a shaft sleeve, a driving ring, a positioning screw, a limiting block, a fitting screw, a medium end stationary ring, a medium end rotating ring and O-shaped sealing rings; the driving ring and the shaft sleeve are connected by the positioning screw; the limiting block for connecting the driving ring and the sealing seat is fixed on the driving ring by the fitting screw; the medium end rotating ring clamps one O-shaped sealing ring and is in interference fit with the shaft sleeve; and the medium end stationary ring clamps the other O-shaped sealing ring and is in interference fit with the sealing seat. The double-end face mechanical sealing device also comprises a rotary type structure and a stationary type balance structure, the rotary type structure is connected with the sleeve shaft, and the stationary type balance structure is positioned in a sealing seat cavity and connected with the sealing seat. The device provides cooling liquid with circulation power, closed-loop circulation of the cooling liquid is achieved, working pressure bearing capacity of the stationary ring is increased, the axial dimension of the whole device is shortened, and production efficiency is improved.

Description

technical field [0001] The invention relates to the field of mining machinery and thermal power generation machinery equipment, in particular to a double-end mechanical sealing device. Background technique [0002] At present, most of the mechanical seals used in pumps such as mineral processing plants, coal preparation plants, and thermal power plants are single-end mechanical seals, and there are two types of mechanical seals with cooling water and without cooling water; mechanical seals with cooling water generally use skeleton oil seals. Sealed cooling water, the service life of the skeleton oil seal is generally only 1-3 months; in water-scarce areas, due to the difficulty of water sources, the water consumption of mechanical seals is large, so anhydrous dry seals are generally used, and in some The industrial and mining temperature is high, and the medium concentration is also high. Anhydrous dry seals cannot meet the production needs, and the general service life is 1...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the mechanical seals used in pumps such as mineral processing plants, coal preparation plants, and thermal power plants are single-end mechanical seals, and there are two types of mechanical seals with cooling water and without cooling water; mechanical seals with cooling water generally use skeleton oil seals. Sealed cooling water, the service life of the skeleton oil seal is generally only 1-3 months; in water-scarce areas, due to the difficulty of water sources, the water consumption of mechanical seals is large, so anhydrous dry seals are generally used, and in some The industrial and mining temperature is high, and the concentration of the medium is also high. Anhydrous dry seals cannot meet the production needs, and the general service life is 1-2 months; the above methods require ordinary replacement of mechanical seals, which is costly and seriously affects production.

[0003] At the same time, due to the harsh working conditions of the sealing device, most of the sealing devices use a single spring structure, but the single spring can only run at low speeds, and the spring tends to twist at high speeds, causing uneven distribution of the liquid film on the sealing surface , the spring must match the journal, and the interchangeability is not good for manufacturing and use, which greatly shortens the service life

The above problems can be avoided by using a multi-spring sealing device, but the multi-springs are easy to corrode due to the small wire diameter, dirt and medium crystallization, which has a great impact on the spring pressure and makes it lose its compensation effect.

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