RU2485373C1 - Manufacturing method of brush seal - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: manufacturing method of a brush seal involves multi-layered winding of a wire on the mandrel so that the required inclination angle of its loops can be provided relative to the mandrel axis. The mandrel is assembled of two rings that are arranged concentrically in one and the same plane, and fixed with a filler; wire winding is fixed on the mandrel and wire is cut along an interannular gap. Easily removable mock-up mass is used as a filler. After the wire is wound on the mandrel, mock-up mass is removed from the interannular gap; after that, the inner ring of the mandrel is turned relative to the outer one through an angle corresponding to the required inclination of a wire bristle in the brush seal, and cutting of wire winding is performed after the brush seal is assembled.

EFFECT: invention increases operating efficiency of a sealing assembly during its operation since it allows obtaining winding of higher density.

5 cl, 12 dwg

Description

The invention relates to sealing equipment and can be used in mechanical engineering, aircraft engine manufacturing and gas turbine engineering.

A known method of manufacturing a brush seal, in which the wire is wound onto a parallel plane of the frame mandrel with the ability to provide the desired angle of inclination of its turns relative to the axis of the mandrel, while in the interval between the planes of the mandrel, an insert is placed, the wire is wound on the mandrel, the insert is removed from the gap and cut the wire in the gap on the individual bristles (US Pat. SU No. 1442917 for 87 g., CL F16J 15/16).

The disadvantage of this method is the following. Removing the cut wires from the coil and stringing them on an annular mandrel to form the bristles makes the assembly process of the brush seal laborious and painstaking, and the quality of the final result is not guaranteed.

A known method of manufacturing a brush seal, in which the wire is wound on a mandrel in a multilayer manner with the possibility of providing the required angle of inclination of its turns relative to the axis of the mandrel, while the mandrel is assembled from two rings, placed concentrically in one plane and connected by a filler along the inter-ring gap, the wire is wound on mandrel and cut the winding, forming a bristle (US Pat. RU No. 2289742 for 2005, CL F16J 15/16). This technical solution is taken as a prototype, because it has the greatest number of features common with the claimed.

The disadvantage of this method is the following. In the manufacture of brush seals in a known manner, it is difficult to tilt the winding turns to the mandrel axis of more than 20 °, because when this angle is exceeded, the winding turns begin to slide from the mandrel.

In addition, the fastening of the wire winding on the mandrel ring is carried out by welding, which does not allow to use, for example, non-metallic materials as a sealant.

The proposed method differs from the known one in that the model mass is used as a binder filler, after winding the wire onto the mandrel, this model mass is removed from the inter-ring gap, after which the inner mandrel ring is rotated relative to the outer ring by an angle corresponding to the required inclination of the wire bristles in the brush seal, and winding cutting is carried out after assembling the brush seal.

The proposed method differs from the known method in that the filling of the gap between the rings with a model mass is carried out in a mold, as well as in that the mandrel is made with a cross-section perimeter equal to the length of the winding wire in a position deviated by the required angle.

The proposed method differs from the known one in that, before cutting the wire winding, its coils are aligned by vibration processing, and also because the brush seal is assembled directly in the engine assembly.

The objective of the invention is to increase the reliability and efficiency of brush seals.

The task is carried out in that in a method for manufacturing a brush seal, in which a wire is wound onto a mandrel in a multilayer manner with the possibility of providing the required angle of inclination of its turns relative to the mandrel axis, the mandrel is assembled from two rings, placed concentrically in one plane and connected by a filler along the inter-ring gap and then the winding of the wire is fixed on the mandrel and cut it, forming a bristle, the model mass is used as a binder filler, after winding the wire on the mandrel this m contains detailed mass is removed from the inter-ring gap, whereupon the inner mandrel relative to the outer ring is rotated by an angle corresponding to the desired inclination of the wire bristles in the brush seal, and cutting the wire winding is performed after assembling the brush seal.

The task is carried out in that the filling of the gap between the rings with a model mass is carried out in a mold, and the mandrel is made with a cross-section perimeter equal to the length of the winding wire in a position deviated by the required angle.

The task is carried out by the fact that before cutting the wire winding, its coils are aligned by vibration processing, and the brush seal is assembled directly in the engine assembly.

The invention is illustrated by figures, which depict the following:

Figure 1 - mandrel in the context.

Figure 2 is a fragment of the mandrel (side view).

Figure 3 - mandrel with a radially wound wire.

Figure 4 - mandrel with a radially wound wire (side view).

Figure 5 - fixation of wound coils of wire using the device.

6 - sections of the fixation of the wound turns (view A).

7 - smelting model mass from the mandrel (in the case of using a wax model mass).

Fig - dissolution of the model mass: in the case of the use of urea, a water-soluble polymer in water or in the case of using the corresponding mass in an organic solvent.

Fig.9 - the twist of the wire turns after the operation to remove the model mass.

Figure 10 - position of the turns of wire winding after twisting.

11 - compression of the turns of wire with the formation of a seal.

Fig - sectional view of wire winding after crimping.

The mandrel for the manufacture of brush seals contains an outer 1 and an inner 2 rings placed concentrically in the same plane. The toroidal shape of the mandrel gives model mass 3, filling the gap between the rings 1, 2 and fastening them together (figure 1 and 2).

Figures 3 and 4 show a mandrel with a radially wound wire 4. The wire is wound tightly in several layers. The equipment for fixing the winding of the wire 4 is shown in the form of an outer collar 5 (Fig. 5) and an expanding ring 6. The fixing sections of the outer collar 5 and the expanding ring 6 are shown in FIG. 6 in close proximity and are indicated by 7 and 8, respectively. In Fig.7 depicts the melting of the model mass 3 from the mandrel in the receiving tank 9.

On Fig depicts the dissolution of the model mass 3 from the mandrel in water or an organic solvent (key 11) poured into the tank 10.

Figures 9 and 10 show the twist of the turns of wire at a given angle β

11 and 12 depict the final operation of the manufacture of the seal - compression of the lateral portions of the bristles and cutting.

The manufacture of brush seals is as follows. First, a mountainous mandrel for winding wire is assembled. The perimeter of the cross-section of the mandrel is calculated equal to the length of the coil of the wound wire in a position deviated by the required angle. In a special form for centrifugal casting with a perimeter of the cross-sectional profile equal to the perimeter of the mandrel, rings 1 and 2 are concentrically placed, centered and fixed. Then, a melt of a special model mass 3 or urea is fed into the gap between the rings and its solidification is ensured. After that, the mandrel blank is removed from the mold, its surface is scraped and the profile is controlled. After that, the wire 4 is wound radially to the coil on the mandrel. At the end of the winding, its thickness and continuity of the wound layers are monitored. Then fix the wound wire on the rings 1 and 2 of the mandrel. To do this, snap-ring is placed on the mandrel ring 1 in the form of an external coupling collar 5 with a profile groove 7 (Figs. 5 and 6), and on the mandrel ring 2, on its inner side, an expanding ring 6. In this form, the snap-in with the mandrel is placed in an oven for smelting model mass. If urea or a water-soluble polymer is used as the model mass, then the equipment with the mandrel is placed in a hot water bath where the urea dissolves.

To smelting the model mass 3, the rigging with the mandrel is placed in the drying cabinet, and the model mass flows into the receiving tank. In this case, the wire winding on the mandrel weakens and sags along with the expanding ring 6 (Fig. 8). Then, the inner ring 2 of the mandrel is rotated together with the expanding ring 6 relative to the outer 1 by an angle corresponding to the required angle of inclination of the turns of wire in the manufactured brush seal. In this case, the coils of the wound wire are pulled. Next, wire winding with rings 1 and 2 is inserted into the socket of the stator assembly of the motor and crimped it to the desired size (Fig. 11). The free sections of the turns of wire are fixed and cut. The inner mandrel inner ring 2 released in this case is used for the manufacture of the next brush seal. The outer ring 1 forms the outer frame of the brush seal and serves to fix the wire bristles in the stator assembly of the engine.

A method of manufacturing a brush seal increases the efficiency of the sealing unit during its operation, since it allows to obtain a winding of a higher density, which contributes to its vibration processing.

The method involves the manufacture of seals that are integrated into the socket of the engine housing, while minimizing the number of parts of the assembly, which helps to reduce the total weight of the product. In addition, the method provides for the processing of the brush seal under the rotor shaft directly in the assembled housing unit, which can significantly reduce the deviation from the alignment of the seal and the rotor during engine assembly. The method eliminates the welding of wire to the ring as an attachment element. At the same time, its bristles are not exposed to heat, which helps to increase the service life of the brush seal. Reduces the likelihood of separation of individual bristles from the seal, at the place of sealing, with their subsequent hit in the critical friction units, which allows you to use this design for sealing oil cavities.

Claims (5)

1. A method of manufacturing a brush seal, in which the wire is wound onto a mandrel in a multilayer manner with the possibility of providing the required angle of inclination of its turns relative to the axis of the mandrel, the mandrel being assembled from two rings, placed concentrically in one plane and connected by a filler along the inter-ring gap, and then onto the mandrel fixes the winding of the wire and cut it, forming a bristle, characterized in that the model mass is used as a binder filler, after winding the wire on the mandrel, this model m SSA removed from the inter-ring gap, whereupon the inner mandrel relative to the outer ring is rotated by an angle corresponding to the desired inclination of the wire bristles in the brush seal, and cutting the wire winding is performed after assembling the brush seal. 2. The manufacturing method according to claim 1, characterized in that the filling with the model mass of the annulus is carried out in a mold. 3. The manufacturing method according to claim 1, characterized in that the mandrel is made with a perimeter of the cross-section equal to the length of the coil of the wound wire in a position deflected by the required angle. 4. The manufacturing method according to claim 1, characterized in that before cutting the wire winding, its coils are aligned by vibration processing. 5. The manufacturing method according to claim 1, characterized in that the assembly of the brush seal is carried out directly in the engine assembly.

Images