Assembly and disassembly method for double-seam allowance matched super large size drum in heavy type gas turbine

Abstract

The invention belongs to the field of machining and particularly relates to and an assembly and disassembly method for a double-seam allowance matched super large size drum in a heavy type gas turbine. According to the assembly and disassembly method for the double-seam allowance matched super large size drum in the heavy type gas turbine, the outer diameter of a tightly sealed ring is fully accommodated by a heating belt, a heat preservation belt is wrapped outside the heating belt, when the electricity is turned on, a wooden mallet is used to axially press different positions on the periphery of the drum, so that the assembly of the double-seam allowance matched super large size drum is achieved; the disassembly method of the double-seam allowance matched super large size drum in the heavy type gas turbine is characterized in that ten, twelve or fourteen lifting jacks are evenly disposed along circumferential direction on a bottom plane of a end face groove of the drum, the height of the lifting jacks is adjusted, according to a principle that counter points form a pair of points, and by means of a force limited spanner, the tightly sealed ring can be disassembled from the drum. The assembly and disassembly method achieves the assembly and disassembly of the double-seam allowance matched super large size drum in heavy type gas turbine, wherein the double-seam allowance matched super large size drum in the heavy type gas turbine is super big in size, complex in structure, precise and compact, and has the advantages of being practical, low in cost, easy to popularize, and capable of further improving product machining quality and efficiency and reducing machining period of parts.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to an assembly and disassembly method of a super-sized drum with double spigots in a heavy-duty gas turbine. Background technique [0002] The heavy-duty gas turbine is an industrial gas turbine for power generation. Its main engine part is a typical single-rotor engine structure. The connecting discs are connected into drum components and unit bodies by different methods such as welding, precision bolts or fastening pins. The diameter of each drum is at least 2m and the weight is more than 10 tons. It has super large size, complex structure, precision and Without losing its compactness. [0003] The connection relationship between the first-level drum, sealing ring and the second-level drum, the connection relationship between the second-level drum, the sealing ring, and the third-level drum, and the connection relationship between the third-level drum, sealing ri...

AI Technical Summary

Problems solved by technology

However, none of the three are suitable for the drum of a heavy-duty gas turbine. The reasons are as follows: First, there is currently no large-scale electric furnace that can accommodate a super-sized drum with a diameter of 2 meters. Even if there is a large-scale electric furnace, it cannot be used, because If the containing body (the sealing ring in the middle) is heated, the outer diameter of the ring groove on the end face of one of the fittings will increase within a certain range, which can reduce the interference amount of 0.015-0.218 or become a gap, and smooth The assembly here is realized, but the inner diameter of the end ring groove at the other mating mouth will also increase at the same time, so that the 0-0.05 gap here will become interference again, and the assembly still cannot be realized. Therefore, the first solution —Heating the containment body cannot be realized; secondly, if the containment body (drum) is cooled, the above-mentioned similar situation will occur, that is, the outer diameter of the drum at the matching seam will be reduced within a certain range, which can make the The interference amount 0.015-0.218 is reduced or turned into a gap, and the assembly here is successfully realized, but the inner diameter of the drum at the other matching seam will also be reduced at the same time, so that the 0-0.05 gap here will become an interference again, Assembly still cannot be achieved, so the second option—cooling the contained body is inoperable; again, the structural rigidity of the connection is not suitable for the connection method that applies a large axial pressure, and the third option—applying axial pressure The method of pressure-realized assembly cannot be used either.

[0005] Similarly, there are three conventional methods for decomposing the interference assembly: one is to use a special disassembly tool—a puller; Separation, the third is to use a wooden hammer or a rubber hammer to apply axial force to decompose the assembly, but for the reburning drum, the above three methods are also not applicable, the reasons are as follows: First, the decomposition method of the puller is applicable. For small parts, if the decomposition puller is specially designed and manufactured for the oversized re-ignition drum, then the weight and volume of the puller itself will be very large, not only its flexibility and accuracy will be greatly reduced, but also in order to overcome its Huge weight requires specially designed spreaders for it, which undoubtedly increases the manufacturing cost and prolongs the manufacturing cycle to a large extent, and the gain outweighs the gain; secondly, the assembly is raised to a certain height above the workbench, and the lower The self-weight of the parts, to achieve independent separation, there will be such a situation: because the mounting sides of the drum and the sealing ring are large-scale thin-walled structures, the inner and outer diameters of the mating surface cannot be an ideal circular surface, and it is bound to There is a certain degree of deformation. After the two parts are assembled to form a combination, the interference at each point along the circumference is not consistent. Therefore, when the combination is raised and the lower part is separated by its own weight, the matching surface is inconsistent The overweight will lead to asynchrony when the mating surfaces are separated. Then, for parts with such a huge weight, the surface that is first separated and landed is very easy to be injured, or even scrapped; third, use a wooden hammer or rubber hammer to decompose Parts, that is, by applying axial force to decompose the assembly, this method is suitable for assemblies with small interference, and the thin-walled weak rigidity of the connection is not suitable for the separation method of applying large axial pressure

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