RU2430282C1 - Procedure for manufacture of circular wire brush packing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: package of metal bristles diverging from common base is formed from metal bar for manufacture of circular wire brush packing. The base is bent into a ring with bristles projecting outside and ends of the bent base are welded. Further, bristles are laid on and squeezed on both sides with equal-sized circular ferrules, external circumference of which coincides with ends of bristles diverging from the base, while diametre of internal circumference is bigger, than external diametre of the bent base. External diametre of the ferule with bristles is welded. Bristles are cut between the base and internal diametre of the ferrules. Wire brush packing is obtained upon separation of the base.

EFFECT: reduced labour input of manufacture and raised reliability of assembly of circular wire brush packing.

2 cl, 4 dwg

Description

The present invention relates to the field of sealing technology, and more specifically relates to a method of manufacturing an annular brush seal, which can be used in mechanical engineering, aircraft, engine building, mainly for gas turbine engines.

A known method of manufacturing a brush seal (RF patent No. 1462917, IPC F16J 15/16, 1987), in which the brush seal is made by wire winding. The manufacturing method involves obtaining oblique wires-seal bristles by shifting in the same plane the edges of the flat turns by the required angle. The method is carried out on a frame coil, which contains two pairs of pivotally mounted parallel rods. One pair of rods has a triangular section and supporting rectangular collars at their ends. The working coil also has a rectangular removable liner.

A known method of manufacturing brush seals for gas turbine engines (RF application No. 94023095/06, publ. 10.01.1996). In the known method, brush seals are made by forming tightly adjacent metal wires into a package by winding. The package is fixed by the compression force using the side plates of the seal, cut it along the working and opposite ends, and the package is welded to the plates along the latter. Moreover, in the process of forming metal wires, small groups of layers are positioned relative to each other using technological gaskets at the end face opposite to the worker. The compression force is applied only along the width of the gaskets between the side plates and connect the gaskets to the package when welding it with the plates. The most effective for the high-quality performance of the brush seal is electron beam welding of the butt end opposite to the worker. In this case, the welding zone is alloyed through technological gaskets, which are made of the material of the main component of the material of the wires with finely dispersed alloying elements uniformly located in it.

A known method of manufacturing a brush seal (RF patent No. 2289742, publ. 2006), 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, placing overlays on one of the mandrel elements, fixing wound material with overlays and cutting the bristle material in the gap, while cutting the bristle material is carried out alternately from different sides of the mandrel. After cutting, the mandrel elements are disconnected from each other and one mandrel element connected to the plates is used as a brush seal element.

A known method of manufacturing a brush seal (RF patent No. 2210694, publ. 2003), in which on a toroidal mandrel containing an annular base and two annular holders, the elastic material is wound in a usual manner, pressed with annular cheeks, the elastic material is cut along the outer diameter of the mandrel and fasten it with adjacent clip and cheek. Then cut the elastic material according to the inner diameter of the desired size. When cutting the elastic material of the inner circle, the adjacent part of the mandrel is also removed. Lastly, adjacent clips are separated and the remaining part of the base is removed, resulting in two complete brush seal kits.

The implementation of the known methods is characterized by increased complexity associated with certain operations for the preparation of bristle wires, their winding and styling.

The manufacture of an annular brush seal without winding and laying of metal wire-bristles was not detected.

The basis of the invention is to improve the manufacturability of the manufacture of brush seals and its reliability.

The technical result is to reduce the complexity of manufacturing, as well as increasing the reliability of the assembly of the annular brush seal.

The problem is solved in that in the manufacture of the brush seal, a package of metal bristles extending from the common base is formed from a metal bar, the base is bent into a ring with bristles protruding outward and the ends of the bent base are welded, then the bristles are applied and crimped on both sides with equal circular rings, the outer the circumference of which coincides with the ends of the bristles extending from the base, and the diameter of the inner circumference is greater than the outer diameter of the bent base, welded along the outer the tool holder with bristles, then cut the bristles between the base and the inner circumference of the holder, and, separating the base, get a brush seal.

It is advisable that the length of the metal bar be equal to the circumference of the annular brush seal.

The proposed method is illustrated by drawings, which show:

figure 1 is a fragment of a perforated metal matrix and a package of bristles,

figure 2 - a package of bristles, bent into a ring and welded at the ends of its base,

figure 3 - illustrates the imposition of ring clips,

4 is an annular brush seal.

The method is as follows.

The manufacturing process of the annular brush seal begins with the preparation of the metal bar 1 (figure 1). In order to avoid additional adjustment of the size of the ring brush seal to the required size of the diameter of the seal, it is advisable that the length of the metal bar 1 be equal to the circumference of the ring brush seal.

A package of metal bristles 2 is formed from a metal bar 1. The best known method for this formation is vibroimpulse electrochemical processing (VIEHO). The metal bar 1 is placed in a device for vibroimpulse electrochemical processing (not shown), a perforated metal matrix 4 is installed above it and VIEHO is produced. The holes 5 of the perforated metal matrix 4 must correspond to the diameter of the metal bristles 2 obtained as a result of VIEHO. To ensure a more snug fit between the bristles 2, the holes 5 in the perforated metal plate 4 are made with the smallest possible step.

During processing, the matrix 4 is lowered onto the surface of the metal bar 1. Metal is etched from the surface of the metal bar 1, with the exception of those places where holes 5 are made in the perforated metal matrix 4. As a result, protruding metal bristles 2 will form along the depth of the bar 1. Moreover, during processing using VIEHO, the perforated metal matrix 4 is not lowered to the entire depth of the metal bar 1, therefore, in its lower part there is an untreated section that serves as a fastening base, about developing a common base 3 for the obtained metal bristles 2. Thus, a package of free metal bristles 2 extending from the common base 3 is formed.

The resulting blank for the manufacture of a brush seal is removed from the device and the base 3 is bent into a ring (FIG. 2) so that the metal bristles 2 are directed outward and the ends of the bent base 3 are welded with a weld 6.

After welding 6 ends on both sides of the bristles 2 impose annular clips 7 (figure 3) and compress them with bristles 2.

The clips 7 are made equal, while the diameter of the inner (smaller) circle of the clips exceeds the outer diameter of the bent base 3, and the outer circle, when applied, does not exceed the length of the bristles 2, i.e. when applying the outer circumference of the clips coincides as if flush with the ends of the bristles 2.

The applied clips 7 are welded together with bristles 2 along the outer diameter of the clips 7 by a weld 8.

The proposed manufacturing method allows you to position the bristles 2 at any angle to the fastening base 3, shifting the clips 7 relative to each other.

After welding, the bristles 2 are cut from the fastening base 3, in a dotted line (Fig. 3), between the base and the inner diameter of the cage, adjusting the diameter of the seal 9 (Fig. 4) to the required size (D _acc. ), And, having separated the base 3, get brush seal 9 (figure 4).

In order to avoid additional adjustment of the size (D _upl. ) _{Of the} annular brush seal, it is advisable that the length of the metal bar 1 was equal to the circumference of the annular brush seal of a given diameter (D _upl. ).

In the manufacture of the VIEEHO package, between the bristles 2 a gap is formed equal to the width of the jumpers between the holes 5. Under the action of compression by the ring clips 7, the bristles 2 fit tightly against each other, without gaps, eliminating unwanted overflow of the working fluid through the seal 9 and thereby increasing the reliability of the brush seal.

The refusal of the operations of winding and laying individual wires reduces the complexity of manufacturing brush seals.

Claims (2)

1. A method of manufacturing an annular brush seal, in which a package of metal bristles extending from a common base is formed from a metal bar, the base is bent into a ring with bristles protruding outward and the ends of the bent base are welded, then the bristles are applied and crimped on both sides with equal circular rings, the outer the circle of which coincides with the ends of the bristles extending from the base, and the diameter of the inner circle is greater than the outer diameter of the bent base, welded around the outer circumference clips with bristles, then cut the bristles between the base and the inner circumference of the clips and, separating the base, get a brush seal. 2. The method according to claim 1, characterized in that the length of the metal bar is equal to the circumference of the annular brush seal.

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