RU2499937C2 - Manufacturing method of brush seals - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: manufacturing method of brush seal implies winding of brush material on fixing members located on a flat surface of mandrel elements. Brush material is wound at required angle increased by 3°…5° to mandrel diameter and required tension in sequence passing over fixing members of internal and external elements of mandrel in a circle. Required number of rows of brush material is considered. Then brush material is compressed by the second cover plate. During compression tension of brush material is gradually released by turning external element at an angle 3°-5° for better sealing, and the whole material is finally compressed by fasteners. Wound brush material is cut by outer circumference and external element of mandrel is removed. Then brush material is attached to cover plates by, for example welding. Mandrel is dismantled, obtained brush seal is treated by inner diameter.

EFFECT: invention improves brush seal reliability.

2 cl, 7 dwg

Description

The invention relates to the field of engineering, in particular, to methods for manufacturing brush seals.

A device for the manufacture of brush seals described in patent RU 2313021 C1, F16J 15/00, publ. December 20, 2007. The device includes mounting flanges fixed to the bar of the articulated parallelogram mandrel. The device is equipped with a clamp adjusting the mandrel, as well as removable rods mounted on the slats. The disadvantage of this device is that the winding is performed on a straight mandrel, which makes it difficult in the future, the layout of the wound material in the ring, it is also possible to slip off the wound material when winding at an angle to the mandrel.

A known method of manufacturing a brush seal, adopted as a prototype, in which the bristle material is wound 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 the bristle material is cut alternately from different sides of the mandrel, after cutting, the mandrel elements are disconnected from each other and one mandrel element is connected ny with overlays, used as an element of the brush seal (patent RU 2289742 C1, F16J 15/16, publ. 20.12.2006 g).

The disadvantage of the prototype is that in the manufacture of the brush seal in this way, it becomes difficult to wind the bristle material at an angle to a radius of more than 45 ° because of the danger of it sliding off the mandrel during winding, in addition, one mandrel element used as a brush seal element leads to an increase in the mass of the latter.

The problem solved by this invention is to prevent slipping of the wound material during winding, maintaining the required angle of inclination of the bristle material and reducing the weight of the brush seal.

This problem is solved by winding the bristle material, including wire, onto the fixing elements of the mandrel according to the "sinusoidal" winding pattern with the required angle p. A manufacturing method is that a mandrel is assembled, consisting of external and internal elements interconnected by fasteners, a pad and a fastener are placed on one of the mandrel elements, the bristle material is wound on the fixing elements. In this case, the locking elements can be, for example, T-shaped to prevent slipping of the wound material of the bristles during the winding process. The fixing elements are arranged on the inner and outer mandrel elements around the circles forming the preliminary inner and outer diameter of the brush seal, while the outer mandrel element is pre-rotated relative to the inner mandrel element, the winding angle β + is maintained (3 ° -5 °). To obtain a denser package of bristle material, the locking elements are staggered. The wound material of the bristles is sealed with the clamping element of the mandrel with an overlay located in it, and as it compresses, the tension of the bristle material is gradually weakened by turning the outer element of the mandrel by a small angle (3 ° -5 °) with simultaneous compression for better sealing. Then they tighten the assembled mandrel using a fastener. The wound material of the bristles is cut around the outer circumference and the outer mandrel element is removed. Next, the bristle material with overlays is fastened at the cut point, for example, by welding. Disassemble the mandrel, the resulting brush seal is treated according to the inner diameter.

The invention is illustrated figure 1-5:

figure 1 - scheme of winding option 1;

figure 2 - scheme of winding option 2;

figure 3 - device with wound bristle material;

figure 4 - brush seal (section);

5 is a section aa.

Figure 1 shows a winding diagram. On the flat surfaces of the mandrel elements, fixing elements 1 are located on the inner mandrel element 4 and 2 on the outer mandrel element 5, while the bristles 3 are wound at an angle β + (3 ° -5 °) and the necessary tension, so that when turning the outer the mandrel element at 3 ° -5 °, a predetermined angle β to the diameter of the mandrel was obtained, alternately bypassing the fixing elements 1 and 2 of the inner and outer mandrel elements, moving in a circle (Fig. 1), while the required number of rows of bristle material was recorded.

Figure 2 shows a winding diagram with the location of the locking elements 1 and 2 in a checkerboard pattern, the principle of winding is similar to the scheme described above.

Figure 3 presents an example of a device for implementing a method of manufacturing a brush seal, containing the inner element of the mandrel 4 with installed around the circumference, for example, T-shaped locking elements 1, forming the inner diameter of the material of the bristles, the outer casing 5 with installed in it, for example, T -shaped locking elements 2 forming the outer diameter of the bristle material. The T-shape of the locking elements prevents the wound bristle material from slipping off during the winding process. The pad of the brush seal 6 (FIG. 3 and FIG. 4) is installed on the bore diameter of the inner element of the mandrel 4. On the inner element of the mandrel 4 there is a hole for the threaded rod 7 for screed material bristles. To prevent rotation when winding the inner element of the mandrel 4 relative to the outer element of the mandrel 5, in the inner element of the mandrel, together with the outer element of the mandrel, a hole is made for the stopper 12. On the outer element of the mandrel 5 there are two threaded holes with handles 8 installed for removal and rotation outer mandrel element. The clamping mandrel 9 is made with a bore diameter for installing on it the lining of the brush seal 10 (Fig.3 and Fig.4). All assembled device and wound bristle material are pulled together with nut 11.

Figures 4 and 5 show the finished brush seal.

The proposed method differs from the known one in that the winding is carried out in a manner that allows the bristle material to be wound at any angle to the diameter and thereby to prevent the bias and slipping of the bristle material during winding and to provide the exact required winding angle, in addition to reduce the weight of the brush seal.

Claims (2)

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, placing overlays on one of the mandrel elements, fixing the wound material with overlays and cutting the bristle material in the gap alternately from different sides of the mandrel, characterized in that when winding the bristle material using locking elements located on a flat surface of the mandrel elements, while winding the material bristles are produced at the required angle of inclination to the diameter, increased by 3 ... 5 °, and alternately, bypassing the fixing elements of the inner and outer mandrel elements, moving in a circle, then compress the resulting annular packet of bristle material with a second patch, and gradually compress the tension bristle material by turning the outer element of the mandrel by 3 ... 5 °, providing the required angle of inclination to the diameter, after which the bristle material is trimmed according to the outer and inner diameter. 2. The method according to claim 1, characterized in that the locking elements are staggered.

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