Dual-end-face mechanical seal

Abstract

The invention relates to a dual-end-face mechanical seal. The dual-end-face mechanical seal comprises shaft sleeves, sealing boxes, sealing bearings, lower static ring base joints, sealing cavities, collection grooves, upper static rings, lower static rings and dynamic rings. The sealing boxes are provided with sealing liquid injection ports and sealing liquid outlets, the sealing liquid injectionports and the sealing liquid outlets communicate with the sealing cavities respectively, and liquidometers for detecting the level of the sealing liquid in the sealing cavities are fixedly connectedto the sealing boxes. The lower static ring bases are provided with discharge outlets communicating with the collection grooves. When the dual-end-face mechanical seal is used under the negative-pressure work condition, the risk that the sealing liquid leaks into a kettle does not exist. The level of the sealing liquid is observed in real time, and the leakage phenomenon of the sealing liquid is discovered in time. The collection cavities can completely contain the leaked sealing liquid, the sealing liquid cannot leak into the kettle, and the safety of the product is guaranteed. The sealing liquid is discharged in time, the mechanical seal is corrected, sealing liquid is supplemented, and the dual-end-face mechanical seal can be normally used after restoring.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a double-face mechanical seal. Background technique [0002] Compared with the single-end mechanical seal, the double-end mechanical seal has better performance, and is suitable for sealing in strong corrosion, high temperature, medium with suspended particles and fibers, gas medium, flammable, explosive, volatile low-viscosity medium, and high vacuum . The double-end mechanical seal is not just a repetition of the single-end mechanical seal. It can effectively prevent the leakage of dangerous, toxic, flammable and explosive substances in some key chemical occasions, and has a high-performance insurance function. When sealing high-pressure media, the pressure difference between the two ends of each seal can be reasonably distributed to increase the working pressure range of the seal. For some poor self-lubricating, easy to condense, and vaporized media, the sealing flu...

AI Technical Summary

Problems solved by technology

The principle of the double-end mechanical seal is basically the same as that of the single-end mechanical seal, which is composed of a cross section perpendicular to the axis of rotation under the action of the fluid pressure, the elastic force of the compensation mechanism and the cooperation of the auxiliary seal to keep fit and relatively slide to prevent fluid leakage. device, but there are the following problems, the double-end mechanical seal device often causes damage to the double-end mechanical seal due to the large pressure difference between the two sides of the mechanical seal caused by the blockage of the gas phase balance pipeline

[0003] To solve this technical problem, Chinese patent CN209180364U provides a double-end mechanical seal device for kettles, which solves the problem of double-end mechanical seals caused by large pressure differences on both sides of the mechanical seal. The problem of damage to the seal is to use the balance tank to balance the pressure in the kettle and the pressure in the mechanical seal cavity under positive pressure conditions to reduce the pressure difference, so that this type of mechanical seal can be used in a higher pressure working environment, but it is not suitable for Negative pressure working environment, because under the action of negative pressure and gravity, the mechanical seal is prone to leakage of sealing fluid, polluting the product, and causing quality accidents in severe cases

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