RU2168088C2 - End-face contact seal - Google Patents

Abstract

FIELD: sealing engineering. SUBSTANCE: seal is intended for sealing of turbomachines, compressors and aircraft gas-turbine engines. It is designed to separate liquid and air media. Seal is made in the form of packet containing box-like yoke press-fitted in body of support. Yoke includes graphite ring and secondary seal. Laminated spring presses graphite ring to rotating metal ring. Graphite ring is locked by stop secured in yoke. Sealing packet is fixed by lock shaped as banding with lugs and secured in circular groove and slots located on external diameter of yoke. EFFECT: enhanced technological effectiveness. 1 dwg

Description

 The invention relates to a sealing technique, namely, to seals of turbomachines, and is intended for the separation of liquid and air environments.

 A mechanical seal is known that contains a cylindrical surface to be sealed, high and low pressure cavities, a sealing flange and an elastic material ring mating with a cylindrical surface to be sealed (see A.S. N 1332967, class F 16 J 15/34 of 12.30.85 g.).

 There is also known a mechanical seal with an adjustable clearance (see AS No. 1093849, class F 16 J 15/34 of 08.23.84), selected as a prototype, containing a rotating and non-rotating ring, an elastic element, a secondary seal, sealing surface.

 A disadvantage of the known devices is that their design does not allow for bench debugging of seals without the use of special devices simulating a support node.

 The present invention solves the problem of improving the manufacturability of the mechanical seal by providing the ability to repair or replace parts of the sealing bag with new ones without the use of special devices.

 To achieve this technical result, an end contact seal containing a rotating and non-rotating ring, a sealing element in the form of a graphite ring and an elastic element, a secondary seal, is made in the form of a package containing a box ring in which a graphite ring is installed, which is installed to interact with the elastic element and fixed by a stopper fixed in a cage, a fixer rigidly connected to the cage, made in the form of a bandage with petals, while on the outer diameter of ymy annular groove formed with the slots. The stopper is box-shaped, and the elastic element is made in the form of a leaf spring.

 Distinctive features of the proposed mechanical contact seal from the known closest to it is the presence of a clip and the implementation of the seal in the form of a package.

 The mechanical seal in the form of a package containing a box cage with a graphite ring located in it, an interacting element and a fixed clamp, provides the ability to repair the seal by replacing the package parts with new or repaired ones, the ability to replace the sealing bag without applying special requirements to the assembly conditions; allows to run in the seal without the use of special devices that mimic the support node.

 The drawing shows a General view of the mechanical contact seal.

 The seal contains a cage 1, which is pressed into the housing of the support 2. In the cage 1 there is a graphite ring 3, a secondary seal 4, a leaf spring 5, which presses the graphite ring 3 through the thrust ring 6 to the end of the metal ring 7. The stop enters the groove of the graphite ring 3 and rigidly connected to the holder 1. The sealing package is fixed with a special retainer 9, which is a bandage with petals and is fixed in an annular groove made on the outer diameter of the holder 1.

 Sealing works as follows.

 The graphite ring 3, the secondary seal 4 are installed in the holder 1. A leaf spring 5 presses the stationary graphite ring 3 against the end of the rotating metal ring 7. Through the thrust ring 6, the seal is made along the inner diameter B and end A of the graphite ring 3. The graphite ring 3 is locked by a box the stopper 8 included in the groove of the graphite ring 3. The entire sealing package is fixed with a special retainer 9, made in the form of a bandage with petals, which is fixed in the annular groove and grooves, located on the outer diameter of the cage 1.

 The package is pressed into the housing of the support 2. Dismantling is carried out by removing the latch 9 and replacing it when reassembling.

Claims (1)

 An end contact seal containing rotating and non-rotating rings, sealing and elastic elements, a secondary seal, characterized in that it is made in the form of a package containing a box cage, a graphite ring located in it, installed to interact with the elastic element and fixed by a stopper fixed in the cage, a latch rigidly connected to it, made in the form of a bandage with petals, while an annular groove with grooves is made on the outer diameter of the cage.