SU1403241A1 - End seal of submersible electric motor shaft - Google Patents

Abstract

The invention relates to the field of electrical engineering. The purpose of the invention is to improve the reliability of the seal. The mechanical seal contains a stationary ring fixed on the shaft 1, and a movable ring 4, the movement of which in the radial direction is limited by means of a rubber ring. In the axial direction, the ring 4 is compressed to the stationary ring by springs, which are mounted in the centering ring 8. The ring 4 is rotated from twisting by means of a protrusion 10, a ring 8 that enters the groove. the movement of the ring 4 in the axial direction ensures its constant compression to the fixed ring. The ability to turn the ring 4 at a certain angle at the time of a sudden change in speed eliminates shocks or jerks leading to the opening of the seal. 2 Il. i (L

Description

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This invention relates to mechanical engineering and relates to mechanical seals of shafts of submersible electric motors.

The purpose of the invention is to improve the reliability of the seal.

FIG. 1 shows the proposed seal on the shaft; incision; in fig. 2 shows section A-A in FIG. one.

The proposed mechanical seal contains a fixed ring 2 of the seal fixed by means of a locking screw on the shaft 1 (Fig. 1). The ring 2 is sealed on the shaft with a rubber ring 3. The movable NOLBCO 4 seals are impregnated in the ring 5 by means of a rubber ring 6, which restricts the movement of the ring 4 only in the radial direction. In the axial direction, the ring 4 is compressed to the ring 2 with fuzzes 7 fixed in the center-dieM ring 8. The junction of the rings 5 and 8 is sealed with a rubber ring 9. The ring 4 is secured from turning by means of a protrusion 10 made in the ring 4 (Fig. 2 ). The protrusion 10 enters the groove 11 of the ring 8. The groove 11 is made considerably wider than the protrusion 10. In the gaps in width between the protrusion 10 and the walls of the groove 11, elastic elements 12 are installed, made in the form of compression or expansion springs. The resilient elements 12 can be fixed by means of a ctBOM sleeve 13 mounted on the protrusion 10. On the sides of the sleeve 13 there are holes 14 in which the ends of the springs 12 abut.

The choice of springs 12 and the method of their attachment depends on the moment of friction forces in the end angle and on the permissible angle of rotation of the ring 4.

Seal works as follows.

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The ring 2, rotating with the shaft 1, at the expense of friction forces transmits the torque to the ring 4. The springs 12 perceive this torque. However, with axial movement, the ring 4 does not experience friction resistance. The characteristics of the springs 12 must be such that when the forces are perceived from the maximum possible twisting moment, if compression springs are used, there will be no collision of the turns. The resistance force of the springs 12 in these directions, especially for small axial displacements, which occur in the face seals, is small. The free running of the ring 4 in the axial direction ensures reliable sealing operation, since in this case the ring 4 is constantly pressed against the ring 2. In addition, the possibility of rotating the ring 4 at a certain angle at the moment of a sudden change in speed or direction of rotation of the shaft prevents jolts or jerks which may lead to a seal opening.

Claims (1)

Invention Formula The mechanical seal of the shaft of the submersible electric motor contains a ring fixed to the rotation and axial movements, which is pressed by means of an axially mounted ring fixed in the centering ring of springs, characterized in that, in order to increase the reliability of operation, in the centering ring an axial groove is made, and on a ring mounted with the possibility of axial movement, a protrusion included in said groove, while between the side walls of the groove and the protrusion placed elastic elements.