External mechanical sealing structure

Abstract

The invention discloses an external mechanical sealing structure. The external mechanical sealing structure structurally comprises a movable ring seat, a first sealing ring, springs, a friction ring assembly, a static ring, a second sealing ring and a fixing piece, wherein the movable ring seat, the friction ring assembly and the static ring are coaxially and sequentially arranged from left to right; the movable ring seat is arranged on the outer circumferential face of the friction ring assembly in a sleeving manner, and the second sealing ring is arranged between the contact faces of the movable ring seat and the friction ring assembly; a plurality of springs are uniformly distributed between the inner end face of the movable ring seat and the end face of the friction ring assembly; thefriction ring assembly is attached to the end face of the static ring; the fixing piece is arranged on the outer circumferential face of the friction ring assembly in a sleeving manner, and the friction ring assembly and the movable ring seat are connected through connecting screws; a notch matched with the first sealing ring is formed in the inner circumferential face of the movable ring seat; and a plurality of threaded holes are uniformly distributed in the tail part of the movable ring seat in the radial direction. After the above technical scheme is adopted, the good pressure change resisting capability is achieved, and installation is simple and convenient. Due to the adoption of the assembly type structure, the same material does not need to be adopted in all parts, and the number of selectable material types is large.

Description

technical field [0001] The invention relates to an external mechanical seal structure. Background technique [0002] The bellows type mechanical seal has a wide range of applications. The bellows is a sealing element that integrates elastic elements, auxiliary seals and torque transmission mechanisms. The common bellows are produced by laser welding process. The process is relatively complicated and the defective rate is high. , so the cost is relatively high. [0003] When the bellows-type mechanical seal encounters the increase of water pressure, the bellows will deform, which will increase the specific pressure of the friction surface and prevent leakage; however, frequent deformation will cause the weld of the bellows to crack. The mechanical seal is then scrapped and cannot be maintained, so the cost of maintenance and replacement is also relatively high. Contents of the invention [0004] In view of the above problems, the present invention provides an external mec...

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Problems solved by technology

[0002] The bellows type mechanical seal has a wide range of applications. The bellows is a sealing element that integrates elastic elements, auxiliary seals and torque transmission mechanisms. The common bellows are produced by laser welding process. The process is relatively complicated and the defective rate is high. , so the cost is relatively high

[0003] When the bellows-type mechanical seal encounters the increase of water pressure, the bellows will deform, which will increase the specific pressure of the friction surface and prevent leakage; however, frequent deformation will cause the weld of the bellows to crack. The mechanical seal is then scrapped and cannot be maintained, so the cost of maintenance and replacement is also high

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