RU2267689C2 - Device for compensation of relocations of a gas duct - Google Patents

Abstract

FIELD: pipeline transportation; devices for compensation of relocations of the gas ducts.

SUBSTANCE: the invention is pertaining to pipeline transportation, in particular, to a device used for compensation of the temperature and technological displacements of abutting parts of the gas ducts of the gas-turbine plants exhaust tract. The device contains two branch-pipes, a thermal-protective coating, an elastic shell overlapping a clearance between the branch-pipes and made in the form of a band, the ends of which are tightly pressed to each other between two flexible bands, for example, by means of a threaded connection. At that the ends of the internal band are fixed to the branch-pipes of the gas duct. The invention ensures simplification of realization of the pipe ducts repair works.

EFFECT: the invention ensures the simplified realization of the pipe ducts repair works.

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Description

The invention relates to mechanical engineering and can be used to connect gas ducts, in particular, to compensate for temperature and technological displacements of the joined parts of the gas ducts of the exhaust tract of gas turbine plants.

Known technical solutions (AS No. 582435, F 16 L 51/02, 1977, AS No. 945580, F 16 L 51/00, 1982, Russian patent No. 1752194, F 16 L 51 / 02, 1989), in which flexible or elastic shells are used to connect the pipes, overlapping the gap between the edges (flanges) of the nozzles. The disadvantage of these designs is the lack of internal thermal protection of the elastic shell.

For the prototype, the technical solution closest to the claimed object was described, described in certificate No. 24262, F 16 L 51/00 for the utility model "Device for compensating the movement of the gas duct", in which an internal heat-insulating coating of the elastic shell and nozzles is installed, fixed with an internal lining with compensation movements of the inner lining due to the overlap of the cladding sheets in the direction of gas flow.

The disadvantage of this design is its low maintainability due to the inability to replace the tubular elastic shell without completely disassembling the junction of the pipes. When repairing a gas duct, a new elastic shell made in the form of a single ring cannot be installed in place of its fastening from the inside of the gas duct, since it is necessary to dismantle the inner lining and the heat-protective coating. It is also impossible to install an elastic tubular shell on the gas duct from the outside, since it is necessary to dismantle the exhaust pipe and supports on which the gas duct stands. These disadvantages are characteristic of any shell made in the form of a single ring, regardless of the method of manufacturing the shell and the profile of its cross section.

The technical task of the invention is to remedy this drawback.

The technical result aimed at ensuring maintainability is achieved by the fact that in the device for compensating the movement of the gas duct, containing two nozzles, a heat-shielding coating that covers the gap between the nozzles, the elastic sheath, the latter is made of tape, the ends of the tape elastic sheath are hermetically compressed with each other between two flexible strips , for example, using a threaded connection, while the ends of the inner strip are fastened to the gas pipe.

The specified set of features ensures the maintainability of the device due to the possibility of installing an elastic shell on the joint of the gas pipe nozzles without disassembling the gas pipe supports or heat-shielding coating located at the pipe joint. In this case, the tight connection of the ends of the elastic shell obtained by compressing them between two flexible strips does not impair the performance of the elastic shell.

Figure 1 shows a device for compensating for the movement of the gas duct (section along the axis of the gas duct).

Figure 2 - fastening of the ends of the elastic shell (cut across the axis of the gas duct).

Figure 3 - hinged ends of the flexible strip to the pipes of the gas duct through the intermediate bracket.

The device for compensating the movement of the gas duct consists of nozzles 1 and 2 having flanges 3 and 4 for fastening the elastic band 5 using bolt joints 6 and pressure bars 7. The heat-insulating coating 8 is fixed by the inner shell 9. The gap between the nozzles 1, 2 is filled with thermal protection 10 fixed by the movable cover 11. The ends of the elastic band 5 in FIG. 2 are compressed with each other by flexible strips 12 and 13 through the sealing layer of rubber 14 using a threaded connection (bolts 15 and nuts 16), while the head of the bolt 15 welded to the plate 12. For the case of large lateral movements of the pipes 1, 2 relative to each other, the ends of the strip 12 can be pivotally connected to the flanges of the pipes through the intermediate brackets 17 using a riveted axis 18.

The work of the proposed device does not differ from the work of the prototype. So, when heating the pipes 1, 2 of the gas duct, the pipes are displaced relative to each other in the axial and transverse directions. Tightness of the exhaust tract is ensured by maintaining the integrity of the tape elastic shell 5 when it is deformed together with the movements of the nozzles 1, 2. The ends of the tape elastic shell 5, fastened together by flexible strips 12, 13, are deformed together with the strips 12, 13. If the ends of the strip are articulated 12 with pipes 1, 2 the deformability of the strip 12 in the transverse direction is increased.

The advantages of the proposed device to compensate for the movement of the gas duct are manifested during its installation (repair). The implementation of the elastic membrane 5 tape allows you to install it on the gas duct at any time, which is especially important when replacing the elastic membrane at the expiration of its working life.

At the same time, a strip 12 with bolts 15 welded to it is first installed on the nozzles. One end of the elastic band 5 is mounted on the strip 12, while the holes for the bolts 15 are cut in place in the shell. In the overlapping zone of the ends of the sheath 5, a sealing layer of rubber 14 is installed. After fastening the tape elastic sheath 5 with the flanges of the nozzles 1, 2 along their perimeter with the help of strips 7 and bolt joints 6, the second end of the tape elastic sheath 5 is also mounted on the strip 12, with the holes in the shell 5 under the bolts 15 are cut in place, and the excess shell 5 is cut off. A strip 13 with grooves for bolts 15 is installed over the overlap of the ends of the shell 5. The nuts 16 are tightened from the middle (top point) of the strip 12. Then the last section of the plates 7 is installed. The tight connection of one end of the shell 5 with the strip 12 can be made at the factory shell.

In addition, the proposed device design is much simpler than the prototype in terms of installation, because when installing a tape elastic sheath with cutting off the excess of its perimeter, it is not necessary to ensure the equality of the perimeters of the tubular elastic sheath and the perimeters of the nozzles. The difference in perimeters arising due to technological tolerances for the manufacture of flanges of pipes and a tubular elastic shell without a cut is usually eliminated by installing additional layers of elastic material between the flange and the elastic shell. This process operation is usually performed at the factory of the device for compensating the movement of the gas duct. At the same time, the elastic shell is fastened to the gas duct sections - pipes, which are joined to the gas ducts at the place of use by means of flanges. To transport such a device from the manufacturer, a large container is required that eliminates damage to the elastic shell.

The elastic shell is made of rubberized NT-7 fabric (heat-resistant).

Thus, the set of essential features of the proposed device to compensate for the movement of the gas duct allows for maintainability and adaptability of its design.

Claims (1)

A device for compensating the movement of the gas duct, comprising two nozzles, a heat-shielding coating that covers the gap between the nozzles, an elastic shell, characterized in that the latter is made of tape, the ends of the tape elastic shell are hermetically compressed with each other between two flexible strips, for example, using a threaded connection, the ends of the inner strip are fastened to the pipes of the gas duct.

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