Mechanical seal device

Abstract

A first seal ring (3) has a clearance H allowing the passage of a sealed fluid, between a shaft (70) and the first seal ring (3) and constituted to communicate a flushing port (41) with the inner peripheral side of the seal face (6) through the clearance (H). A mounting part (30) has a cooling annular groove (32) in the form of covering the seal face (6) of the first seal ring (3) mounted to the inner peripheral surface (8), from the outer diameter side, and the outer throttle face (33) of the cooling annular groove (32) is fitted in proximity to the outer peripheral seal face of a second seal ring (10) while having a cooling fluid passage (40) communicating with the cooling annular groove (32). The invention reduce the sliding heat of a seal face while preventing clogging and sticking of solid matter of a sealed fluid to a mechanical seal externally mounted to a device body.

Description

technical field [0001] The present invention relates to a mechanical seal device, in particular to a ferrule-type mechanical seal device suitable for sealing a sealed fluid containing a high viscosity sealed fluid or slurry without adhesion or clogging between constituent parts by solids of the sealed fluid. Background technique [0002] The technology prior to the present invention is that described in the detailed specification of US Patent No. 4,290,611. Figure 5 is the appendix of this U.S. Patent No. 4,290,611 Figure 4 A half cross-sectional view of a generally marketed mechanical seal arrangement shown and associated with this patent. [0003] Figure 5 Among them, 100 is a mechanical seal device, the mechanical seal device 100 is mounted on the rotating shaft 151, and is mounted in the stuffing box 150 by bolts 160, and a pair is formed for this purpose. [0004] The main components of the mechanical seal device 100 are the liquid seal device 101 , the first seal f...

AI Technical Summary

Problems solved by technology

However, due to the structural limitations of the device, it is often not possible to enlarge the diameter of the inner peripheral surface of the stuffing box 150.

Therefore, the gap between the inner peripheral surface 156 of the stuffing box 150 and the liquid sealing device 101 becomes smaller, causing the fluidity of the sealing fluid to deteriorate, and the sliding friction between the rotating sealing surface 103 and the fixed sealing surface 113 cannot be cooled. damage to the sealing surface

[0012] Moreover, even if liquid is injected from the flush port 158, it is difficult to clean the liquid sealing device 101.

[0013] Especially, in the case of the fluid to be sealed containing slurry or the fluid to be sealed with high viscosity, between the liquid sealing device 101 and the inner peripheral surface 156 of the stuffing box 150, it is easy to be clogged by the slurry contained in the sealing fluid, thereby causing sliding. When the cooling effect of the sealing surfaces 103, 113 is deteriorated, the sealing ability of the two sealing surfaces 103, 113 is reduced at the same time, which in turn causes the sealed fluid to leak from between the sealing surfaces 103, 113

[0014] There is also the problem that the spring 105 is in direct contact with the sealed fluid, causing the spring 105 to corrode, rust, and reduce its elasticity, or the mud of the sealed fluid is attached to the spring 105, causing the spring 105 to elastically push the rotating seal ring 102. Furthermore, sludge will adhere to and enter the sliding surface between the rotating seal ring 102 and the sleeve 153, or the sliding surface between the liner 108 and the sleeve 153, resulting in a decrease in the surface pressure of the rotating sealing ring 102. Responsiveness deteriorates, reducing sealing ability

[0015] In this way, the liquid sealing device 101 must be provided with a double sealing device due to the reduced sealing ability, the overall structure becomes complicated, and the necessary assembly accuracy must be achieved.

In particular, the complicated structure of the liquid sealing device 101 makes it difficult to cool the rotating seal ring 102 and the stationary seal ring 113, which may cause thermal deformation of the sealing surfaces 103, 113, reduce the sealing performance, and cause damage to the sealing surfaces.

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