RU2289742C1 - Method of producing brush seal - Google Patents

Abstract

FIELD: sealing engineering.

SUBSTANCE: method comprises winding the bristly material on the mandrel made of two members arranged so that to define a space between them and interconnected via fastening members, mounting linings on one of the members of the mandrel, locking the bristly material wound and linings, and cutting the bristly material in the space. The bristly material is cut alternatively from opposite sides of the mandrel. Subsequent to cutting, the members of the mandrel are disconnected and one of the mandrel members that is connected with the linings is used as a member of the brush seal.

EFFECT: simplified method of producing and enhanced reliability of the brush seal.

3 cl, 7 dwg

Description

The invention relates to sealing techniques, in particular to methods for manufacturing brush seals, and can be used in mechanical engineering, aircraft engine building and other technical fields.

A known method of manufacturing a brush seal, including winding the material for the bristles on the mandrel in the form of two, outer and inner, concentric rings connected to each other with the formation of an annular gap using fasteners located in the gap between the rings, the placement on the outer ring of the inner and outer ring pads on the lateral surfaces of the wound material at the non-working end, fixing the wound material by applying a compression force to the pads with subsequent welding or soldering two pairs of side plates, for cutting the bristle material in the gap sealing and separation from the mandrel (see. U.S. Patent №4934759, cl. B 25 B 1/29, publ. 19.06.1990).

However, the known method is laborious to manufacture, and the reliability of the seal obtained by this method is low.

The technical result of this method is the simplification of manufacturing technology and improving the reliability of the brush seal.

The specified technical result is achieved by the fact that in the method of manufacturing a brush seal, which includes winding the bristle material on a mandrel of two elements located to form a gap between them and connected to each other by fasteners located in the gap between the mandrel elements, the placement of overlays on one of the elements mandrels, fixing wound material with overlays and cutting the bristle material in the gap, according to the invention, the cutting of the bristle material is carried out alternately from different sides of the mandrel, le cutting elements of the mandrel is detached from each other and one of the mandrel member coupled to plates, is used as the brush seal element.

The bristle material can be cut at different distances from one element of the mandrel, which allows, for example, to seal stepped parts.

To facilitate assembly conditions, at least one of the mandrel elements may have a groove for fixing the fasteners to the mandrel.

Figure 1 schematically shows a mandrel in the form of two concentric rings - an embodiment;

figure 2 - mandrel in the form of two concentric rings (top view);

figure 3 - blank brush seal;

figure 4 - brush seal for the shaft;

figure 5 - brush seal for the stepped shaft (embodiment);

figure 6 - a mandrel of parallel elements (embodiment);

7 is an embodiment of a mandrel with grooves.

The mandrel for the manufacture of a brush seal contains two elements made, for example, in the form of two concentric rings - the outer ring 1 and the inner ring 2, located relative to each other with a gap 3 and interconnected by fasteners, for example screws 4, located in the gap 3, for example, radially between rings 1 and 2. The bristle material 5, for example, nichrome wire, pads 6, 7 are placed on the ring 1. The non-working part 8 of the brush seal is located in the housing 10, the working part 9 is on the side of the shaft 11 (see Fig. .four). As an embodiment, the fasteners can be made in the form of a rubber ring 12, and the mandrel elements can have grooves 13, 14 (see Fig. 7). As an embodiment, the mandrel can be made of parallel elements 15, 16 (see Fig.6).

The implementation of the method is considered on the example of manufacturing a brush seal for the rotor shaft of a gas turbine engine.

Connect the fasteners, for example screws 4, the outer and inner rings 1, 2 with a gap 3 between them (Fig.1, 2). The size of the gap 3 is set in advance depending on the operating conditions of the brush seal, taking into account the necessary size of the working part 9 (free ends of the bristles), i.e. Departures of wire bristles with cutting allowance. After that (see Fig. 3), the wire is wound on rings 1, 2. The wire is wound in a known manner and using standard devices, for example, according to the scheme when the mandrel is placed inside an annular shuttle having a certain supply of wire, rewound from the shuttle to the mandrel during their relative movement, while the turns of wire cover the surface of the mandrel and form a multilayer wire package. After winding the wire onto the lateral outer surfaces of the material 5 wound on the ring 1, the plates 6, 7 are placed and fixed by, for example, electron beam welding or by soldering with the wound material and simultaneously with the mandrel element, ring 1, in the zone of the inoperative part (end ) brush seals. After this, using the ring electrode, the wire is cut in the gap 3 alternately, first from one side of the mandrel, and then from the other side of the mandrel, to the fasteners - screws 4, thereby retaining the screws 4 and obtaining a bristle with free ends of the required length . After cutting by loosening the screws 4, the rings 1, 2 are disconnected. The inner ring 2 can be reused for the manufacture of new seals, and the outer ring 1 together with the pads 6, 7 are processed to the specified dimensions and a finished seal with a double bristle is obtained. However, options are possible when processing the outer ring 1 together with the linings 6, 7 is not needed.

The finished seal is installed by the base in the housing 10, and the free ends of the bristles - the working part - seal the area between the housing 10 and the shaft 11 (see figure 4).

In the case of a stepped shaft, the working part of the brush can cover each step of the shaft 11 (see figure 5).

One of the advantages of the proposed method is the possibility of its use in the manufacture of brush seals of almost any shape in any spatial position, for example at an angle to the horizontal axis of the shaft. To do this, it is necessary to make a mandrel of the appropriate shape and perform the operations described above.

As the fastening element, for example, a rubber ring 12 can be used, as shown in FIG. 7, which is located in the gap between the mandrel elements. Using a rubber ring, the mandrel elements are fixed relative to each other. The rubber ring 12 is fixed on the elements of the mandrel, for example, using centering grooves 13, 14 made in the elements of the mandrel.

Claims (3)

1. A method of manufacturing a brush seal, including winding the bristle material on a mandrel of two elements located with the formation of a gap between them and connected to each other by fasteners located in the gap between the mandrel elements, placing overlays on one of the mandrel elements, fixing the wound material with overlays and cutting the bristle material in the gap, characterized in that the cutting of the bristle material is carried out alternately from different sides of the mandrel, after cutting disconnect the mandrel elements from each other and a ding mandrel element connected to the pads is used as a brush seal element. 2. The manufacturing method according to claim 1, characterized in that the bristle material is cut at different distances from one element of the mandrel. 3. A manufacturing method according to any one of claims 1 and 2, characterized in that at least one of the mandrel elements has grooves for fixing the fasteners to the mandrel.

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