Composite cassette double shaft seal

Abstract

The invention discloses a composite clamping box type double-shaft seal, which comprises a seal cover unit, a shaft sleeve unit, an outer sealing unit and an inner sealing unit. The seal cover unit comprises a seal cover component; the shaft sleeve unit comprises a shaft sleeve penetrating through the seal cover component; the outer sealing unit comprises a conveying ring and an outer sealing mechanism, wherein the conveying ring is arranged on the shaft sleeve and located in an accommodating space of the seal cover component, and the outer sealing mechanism is arranged on the seal cover component and is sleeved on the shaft sleeve. The inner sealing unit comprises an inner sealing mechanism and a flexible mechanism, wherein the shaft sleeve and the conveying ring are sleeved on the shaft sleeve at intervals, and the flexible mechanism and the inner sealing mechanism are sleeved on the shaft sleeve in a combining way. By means of the deformation amount of a corrugated pipe of the flexible mechanism, the composite clamping box type double-shaft seal can bear the axial pressure, radial pressure and the torsion force, absorb the vibration and reduce the vibration and wear between members; therefore, the double-shaft seal is suitable to the field which is at the high temperature and likely to generate steam shock due to the fact that the process liquid is easy to vaporize.

Description

technical field [0001] The invention relates to a shaft seal, in particular to a composite cassette double shaft seal suitable for high-temperature easy-to-vaporize process. Background technique [0002] The shaft seal is installed in the gap between the wall surface of the rotating mechanical equipment and the rotating mandrel, and is used to prevent the fluid or gas in the rotating mechanical equipment from seeping through the gap. The double-shaft seal is used when the process fluid conveyed by the rotating mechanical equipment is a volatile substance (VOC), or a toxic or corrosive substance, or a rotating mechanical equipment that requires high temperature cooling. . [0003] refer to figure 1 , China Taiwan Announcement No. 459938 "Clamp Type Shaft Sealing Device for Rotating Machinery" new patent, the shaft sealing device 2 includes a sleeve 21 set on the mandrel 10 of a rotating machine 1 and has an end cover 211 1. A first rotating ring group 22 movably sleeved ou...

AI Technical Summary

Problems solved by technology

[0008] If it is used to deal with high-temperature or easily vaporized fluid, the fluid will not only generate axial and radial pressure on the entire structure, but also generate radial pressure and torque on the first rotating ring group 22 in the shaft hole 12, and the fluid will vaporize at the same time Steam shock will also occur to affect the stability of the overall structure, which affects the sealing and leak-proof effect of the first rotating ring group 22, and greatly shortens the service life of the shaft sealing device 2

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