SU140681A1 - Hundred night seal - Google Patents

Description

In centrifugal pumps operating with aggressive fluids or in hazardous and explosive environments, the shaft seal is of great importance, especially at elevated ambient temperatures and pressures above or below normal. In order to prevent leakage of working fluids and to ensure the normal operation of the entire pumping installation, stand-alone seals are used that contain a spring-loaded sleeve rotating with the shaft, moving under the action of centrifugal weights along the shaft protection sleeve and closing the sealing end with its end face. However, such standing seals do not ensure the reliability of work and the safety of maintenance personnel due to the premature exit from the face of the contacting surfaces when raising or lowering the pressure. In the hundred-night seal according to the invention, in order to reduce the wear of the contacting end surfaces of the seal by reducing the specific pressure during the rotational speed of the pump shaft, a membrane mounted spring-loaded onto the shell with a ring pressed into it, contacting its end face with a rotating sleeve and garden fittings, is applied. with its tapered bore on the cone of the protective sleeve when the shaft stops rotating.

In the proposed hundred night seal ring in contact with the cone of the protective sleeve, can be made of fluoroplastic.

The drawing schematically shows the proposed one-night seal.

The rear disc / impeller has three annular grooves 2 in which three-piece fluoroplastic rings 3 are placed, moving in the radial direction under the action of centrifugal force. Between the first and second parts of the ring 3 there is a vertical drilling 4 connected to the spiral 5 by horizontal drilling No. 140681-2 with a hole 6, which serves to supply the working fluid to the hydraulic seal chamber (not shown).

In the rear cover 7 of the spiral housing 8 there is a shoulder 9, along the axis of which the ring W slides with a sleeve 11 made of fluoroplastic. The ring 10 and the sleeve // are fastened to the spiral casing S with a fluoroplastic diaphragm 2, which prevents leakage of the working fluid with the closed one-night seal. A protective sleeve 14 of a night seal and a ring 15 are mounted on the shaft 13, between which there are fluoroplastic gaskets to prevent slit leaks and stagnant fluid between the parts. Along the axis of the protective sleeve 14, a movable sleeve 16 is moved, connected to the ring 15 by two hinged links 17 with a load 18 and a steel spring 19.

The night-night sealing mechanism is closed by a detachable case 20, in the lower part of which there is a drainage tube 21 for draining the flowing liquid into the container. Under the action of the cylindrical spring 19, the movable sleeve 16, overcoming the resistance of the elastic element 22, moves the ring 10 and the sleeve 11 to a hundred night seal towards the suction side and closes the conical gap between the sleeve // hundred night seal and the protective sleeve 14.

Such a position of the parts and assemblies allows suction and filling of the pump cavities with the working fluid. Leakage and air suction with this design are absent.

Subject invention

Claims (2)

1. One hundred night seal with a spring-loaded sleeve rotating together with the shaft, moved by the action of centrifugal weights along the shaft protective sleeve and a sealing joint closing with its end, characterized in that, in order to reduce the wear of the contacting end seal surfaces by reducing the specific pressure during the buildup period the revolutions of the pump shaft, a spring-loaded shell is attached to the membrane, with a ring pressed into it, which contacts its end with the rotary sleeve 1 and sleeves its shaft with a bore boring, on a cone of protective gplzy when the shaft rotates. 2. Sealing according to claim 1, characterized in that the ring in contact with the cone of the protective sleeve is made of fluoroplastic.