SU1603111A1 - Rod seal - Google Patents

Abstract

The invention relates to a sealing technique and makes it possible to increase the reliability of the seal. The pins 15 installed in the stem sealing chambers 1, under the action of the springs 16 with their conical surfaces 14, press the conical surfaces 9 of the segments 8 of the gland ring 7 in contact with them, unclenching the segments into the wedge between the chamber 1 and the support ring 5 and creating tight contact between the inclined planes 12 of the support ring 5 and the flat edges of the 13 segments 8. The heat released from the rubbing of the sealing elements 2 and 3 through the rod 10, to which they are pressed by pressure inside the chamber 1 and the bracelet springs 17, is effectively removed from the compaction elements through the support rings 4 and 5 and the gland ring 7 into chambers 1 and 6 due to the large contact area of the parts touching the planes. 5 il.

Description

FIG. one

The invention relates to a sealing technique, in particular to seals of piston compressor rods.

The aim of the invention is to improve the reliability of the seal by increasing the efficiency of heat removal from the sealing elements.

FIG. 1 shows the stem seal; in fig. 2 — gland ring structure; in fig. 3 shows section A-A in FIG. 2; in fig. 4 — support ring structure; in fig. 5 is a section BB in FIG. four.

The stem seal consists of a chamber 1, in which cavity there are flat annular sealing elements 2 and 3 made of a composite polymer material placed between the anti-extrusion support rings 4 and 5 of heat-conducting material, for example bronze, and pressed to the end surface of the adjacent chamber 6 and the inner the side surface of the chamber 1 by means of the gland heat-conducting ring 7. The ring is made in the form of a truncated polyhedral pyramid with a top cut along the edges into segments 8, directed in the direction of the low pressure zone - chamber b, and with the inner conical surface 9 with the apex of the cone, also directed towards the low pressure zone

On the end surface of the support ring 5, radial slopes are made in the low pressure direction and the stem 10 has grooves 11 with a flat bottom 12 in contact with their inclined planes with the faces of the 13 segments 8, which are the lateral faces of the pyramid.

Segments 8 with their inner conical surface 9 are in contact with the conical surface 14 of the conical pins 15, pressed by the springs 16 and movably mounted in the chamber 1.

Sealing elements 2 and 3. are mounted with bracelet springs 17,

The grooves 11 on the support ring 5 are delimited by the ribs 18.

The stem seal works as follows.

The pins 15 under the action of the springs 16 with their conical surfaces 14 press against the coic surfaces 9 of segments 6 that are in contact with them, unclenching the segments into a wedge between chamber 1 and the supporting

ring 5 and creating close contact of chambers 1 and 6 of segments 8, support ring 5, sealing elements 2 and 3 and support ring 4 with each other in the axial direction of 5 research institutes, with each two contacting parts contacting along the plane and not broken transverse displacements of the seal parts, and each segment 8 moves independently of the other segments even at different depths of the grooves 11, due to manufacturing errors.

The gas pressure from the side of the ring 7, penetrating the gaps between the segments 8

5 and the ribs 13 into the chamber 1, as well as the bracelet spring 17, press the sealing elements 2 and 3 against the rod 10.

The heat released due to the rubbing of the sealing elements along the stem is effectively removed from them through the support

. rings 4 and 5 and the camera pressure ring 7

1 and 6 due to the large contact area

parts in contact with planes,

as a result, reliability is improved.

5 seals

Formulas a and 3 o Brethrens A stem seal containing at least one chamber with sealing and support rings installed in it, a gland element in the form. a segmented ring in contact with the support ring on the side of the high pressure cavity, and an expandable element,

5 characterized in that, in order to increase reliability, the segment ring is made in the form of a truncated pyramid cut along the ribs into segments with the apex directed towards the low

0 pressure, with the inner conical surface, the top of the cone of which also faces the low pressure zone, on the end surface of the support ring facing the gland element, radial grooves with a flat bottom, inclined toward the low pressure zone, and the rod contacting inclined edges with the edges of the segments, and the expanding element is made

0 in the form of spring-loaded conical pins, which contact their conical surfaces with the internal conical surfaces of the segments.

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1603111

6 FIG.

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Claims (1)

Claim A stem seal, comprising at least one chamber with sealing and support rings installed therein, a clamping element in the form of a segment ring in contact with the support ring from the side of the high pressure cavity, and with an expanding element, characterized in that, in order to increase reliability, the segment ring is made in the form of a truncated pyramid cut along the edges into segments with a vertex directed towards the low-pressure zone, with an internal conical surface, the top of the cone of which also faces a hundred on the low pressure zone, on the end surface of the support ring facing the clamping element, there are made radial grooves with a flat bottom, inclined towards the low pressure zone and the rod, in contact with their inclined planes with the faces of the segments, and the expanding element is made in the form of spring-loaded conical pins, cantacting their conical surfaces with the inner conical surfaces of the segments. 1603111 _f Fie. Z. FIG. 5