CN101418859A - Dry friction proof outer-mounted clutch type mechanical seal - Google Patents

Abstract

The invention discloses a structure improvement mainly aiming at the problem that the conventional external mounted mechanical sealing always generates dry friction accident. The invention disposes a clutch sealing case 1 on the radial and external part of the original external mounted mechanical sealing, arranges a centrifugal block 2 in the case, and arranges the centrifugal block on a centrifugal shaft 3. One end of the centrifugal block is pressed on a rotating pressure plate 4, and the rotating pressure plate is pressed on the external part of the sealing surface of the rotating ring 5, thereby effectively preventing the generation of the dry friction accident in mechanical sealing, ending the history that the mechanical sealing can not operation under dry friction status, and greatly improving the service life of the mechanical sealing.

Description

Dry friction proof outer-mounted clutch type mechanical seal

Technical field; The present invention relates to the improvement of mechanical seal structure.

As everyone knows, in the working specification of installing and using specification of mechanical seal, total bound a word like this, " not allowing mechanical seal under dry condition, to turn round ".This is because sealing surface turns round under dry condition, owing to lost lubricated, the cooling of meson, the sealing surface friction temperature raises rapidly, and sealing surface will soon be destroyed, causes seal failure immediately.However regulation also is difficult to avoid the generation of dry friction accident.Because the pump depletion phenomenon is the artificial control that is difficult to.

We have proposed following corrective measure and technological scheme at the problems referred to above; See that Fig. 2 is provided with centrifugal seal box 1 at the radially outer of all external mechanical seals, be provided with centrifugal 2 in the box, centrifugal is arranged on the centrifugal shaft 3.Centrifugal vertical end is pressed on the rotation platen 4, and the rotation platen is pressed in the outside of rotating ring 5 sealing surfaces.

Above measure and technological scheme are to realize like this

Analyze according to erection drawing 2, spring force H must be greater than more than 20% of centrifugal force L sum of the sticking centrifugal generation of system power N+ of the meson between the meson pressure F+ sealing surface in the Seal cage, could safety play seal action.We make centrifugal centrifugal force L equate with the sticking system power N of the meson between the sealing surface when the centrifugal force of centrifugal generation of design.Like this when in a single day pump occurs finding time, the sticking system power N of the meson between the sealing surface disappears immediately, and when F+L power sum during greater than H, spring will be compressed, sealing surface is opened automatically, natural sealing surface also just can not be destroyed, sealing just can not lost efficacy yet.

Description of drawings:

Fig. 1 be former routine can not dry friction proof the external mechanical seal structural drawing

Fig. 2 is a dry friction proof centrifugal force external mechanical seal structural drawing of the present invention

The effect that the present invention is useful

1. effectively prevented dry friction, thereby mechanical seal can have been remained in operation and not when pump depletion Destroyed.

2. effectively prevent the generation of mechanical seal dry friction accident, improved the use longevity of sealing Life.

Claims (1)

1, the present invention is characterized in to be provided with clutch sealing case 1 at the radially outer of external mechanical seal, be provided with centrifugal 2 in the box, centrifugal is arranged on the centrifugal shaft 3.An end of centrifugal is pressed on the rotation platen 4, and the rotation platen is pressed in the outside of rotating ring 5 sealing surfaces.

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