RU2494300C1 - End seal - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: in an end seal containing a housing and a rotating ring tightly installed on the shaft and a non-rotating ring contacting to it, which are arranged in the above end seal and forming pairs of friction, the rotating ring is fixed against axial movement with a hydrodynamic foot made in the form of a ring fixed on the housing and contacting to the rotating ring so that a closed cavity for supply of sealing liquid is formed.

EFFECT: possible manufacture of a seal of a pack type, which is installed on a compressor in the form of an assembly and does not require reworking for actual axial dimensions.

2 cl, 2 dwg

Description

The invention relates to the field of compressor engineering and pump engineering, namely to mechanical seals.

Known mechanical seal comprising a body and placed therein sealingly mounted on the shaft of the rotating ring and contacting them with the non-rotating axially movable ring, forming a friction pair. The rotating ring is located on the machine shaft and is fixed against axial movement by a nut. The mechanical seal also contains springs for creating contact between the end surfaces of the rotating and non-rotating rings, a consumable ring providing the consumption of sealing oil and secondary seals for sealing the stationary ring in the housing, the movable ring on the shaft. (see Design and calculation of centrifugal compressor machines. VB Shnepp. "Mechanical Engineering", Moscow, 1995, p. 137-140, Tribology of bearings and liquid friction seals of high-speed turbomachines. V.A. Maksimov, G.S. Batkis, Feng Publishing House, Kazan 1998, p. 366).

A disadvantage of the known technical solution is the presence of parts (nuts, screws) securing the rotating ring from axial displacement on the shaft. In this case, the final assembly of the seal is made directly in the compressor.

The technical result of the invention is the possibility of manufacturing a batch type seal, which is installed on the compressor fully assembled and does not require modification to the actual axial dimensions.

The technical result of the invention is achieved due to the fact that in the mechanical seal containing the housing and placed in it a rotating ring sealed on the shaft and a non-rotating ring in contact with it, forming friction pairs, according to the change, the rotating ring is fixed from the axial displacement by a hydrodynamic fifth made in the form a ring mounted on the housing and in contact with a rotating ring with the formation of a closed cavity for supplying a sealing fluid.

Preferably, the hydrodynamic heel has radial grooves on the surface in contact with the rotating ring.

The invention is illustrated in the drawing (figure 1), where:

1 - non-rotating axially movable ring;

2 - springs;

3 - case;

4 - a rotating ring;

5 - hydrodynamic heel;

6 - shaft;

7 - grooves;

8 - flange.

The mechanical seal includes a housing 3 and a rotating ring 4 installed therein, hermetically sealed on the shaft 6. The rotating ring 4 is rotatably mounted on the shaft 6 with it. A non-rotating axially movable ring 1, mounted on the housing 3, is hermetically sealed and spring-loaded by means of springs 2 in the axial direction in contact with the rotating ring 4. The rotating ring 4 and the non-rotating ring 1 form a friction pair. The non-rotating ring 1 is spring-loaded by means of a spring 2 installed between the housing 3 and the flange 8 of the non-rotating ring 1. The spring 2 abuts at one end on the flat surface of the flange 8, and the other end abuts against the housing 3. The rotating ring 4 is fixed from axial displacement by a hydrodynamic fifth 5 made in the form of a ring. The hydrodynamic heel 5 is fixed on the housing 3 freely and is in contact with the rotating ring 4 with the formation of a closed cavity for supplying a sealing fluid. The rotating ring 4 of the opposite side of the friction pair rests axially against the hydrodynamic heel 5. The hydrodynamic heel 5 has radial grooves 7 on the surface in contact with the rotating ring 4. The grooves 7 of the heel 5 are made to create hydrodynamic force.

The mechanical seal operates as follows.

A sealing fluid is supplied under pressure B to the hole B (FIG. 1), which washes a friction pair and cools it. Draining is carried out through the grooves 7. By rotating the rotating ring and between the fifth fluid due to wedge a hydrodynamic lifting force arises, which receives an axial load from the spring action and hydrostatic pressure in the friction pair.

Claims (2)

1. An end seal comprising a housing and a rotating ring sealed on the shaft and a non-rotating ring in contact with it, forming a friction pair, characterized in that the rotating ring is fixed from axial displacement by a hydrodynamic heel made in the form of a ring mounted on the housing and in contact with a rotating ring with the formation of a closed cavity for supplying a sealing fluid. 2. The mechanical seal according to claim 1, characterized in that the hydrodynamic heel has radial grooves on the surface in contact with the rotating ring.

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