A method of interfacing a power turbine with a gas generator

Abstract

The application discloses a power turbine and gas generator butt joint assembly method, and the butt joint assembly method comprises the following steps: sequentially assembling and balancing a power turbine rotor; measuring a guide vane throat area of the power turbine; sequentially performing general assembly of the power turbine; disassembling a first guide vane from the power turbine, hoisting the first guide vane and adjusting the first guide vane to be horizontal, and then butt joining the first guide vane with a gas generator; and butt joining the gas generator and the power turbine through a first guide vane rear mounting edge of the power turbine, leveling a part of the power turbine after the first guide vane is disassembled, butt joining the part with the first guide vane of the gas generator which has been butt joined, and completing the assembly. The method is simple and easy to implement, has no safety hidden danger, is convenient for workers to quickly master the butt joint technology of the power turbine and the gas generator, and can effectively improve assembly efficiency and qualification rate.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine assembly technology, specifically relating to a method for docking and assembling a power turbine and a gas generator. Background Technology

[0002] A gas turbine is composed of a gas generator and a power turbine assembly. The gas generator is the core unit, consisting of a compressor, transition section, combustion chamber, and turbine. Key technologies in power turbine assembly include power turbine shaft assembly and balancing, power turbine guide vane area measurement, power turbine final assembly process, and gas generator-power turbine docking assembly technology. Matching the gas generator and power turbine is crucial; the challenge lies in performance matching methods, requiring the design of a suitable power turbine to meet the overall turbine delivery specifications.

[0003] Given the availability of methods for testing the gas generator, the successful completion of the overall test depends on whether the performance indicators of the gas generator and the power turbine meet the requirements after installation, as well as the assembly balance of the power turbine and the measurement of the throat area. These are the technical challenges and key points. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a method for docking and assembling a power turbine and a gas generator, which can quickly complete the docking of the power turbine and the gas generator and ensure the smooth installation of the gas turbine.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for docking and assembling a power turbine and a gas generator includes the following steps:

[0007] The power turbine rotor is assembled and balanced in sequence.

[0008] The power turbines are assembled sequentially.

[0009] The gas generator and power turbine are connected to each other via the first-stage guide of the power turbine to complete the assembly.

[0010] As a preferred embodiment, the steps of assembling and balancing the power turbine rotor in sequence include:

[0011] The first-stage turbine disk is assembled with a first-stage disk, first-stage blades and lock plates, and the first-stage turbine disk is statically balanced.

[0012] The second-stage turbine disk is assembled with a second-stage disk, second-stage blades, and lock plates, and then statically balanced.

[0013] Complete the installation of the shaft assembly, which includes a sleeve, graphite ring, and sound wheel, and perform dynamic balancing on the shaft assembly;

[0014] The first-stage turbine disk and the second-stage turbine disk are fitted together by the arc-shaped end teeth of the first-stage turbine disk and the second-stage turbine disk. After the shaft assembly is assembled, the three are connected to form a power turbine rotor, and the power turbine rotor is dynamically balanced.

[0015] As a preferred embodiment, after the primary turbine disk, secondary turbine disk, and shaft assembly are assembled in place, they are connected to form a power turbine rotor by multiple tie rods.

[0016] As a preferred embodiment, after the steps of assembling and balancing the power turbine rotor in sequence, the method further includes measuring the guide throat area of ​​the power turbine, and guiding the final assembly of the power turbine based on the guide throat area of ​​the power turbine.

[0017] As a preferred embodiment, the step of measuring the guide throat area of ​​the power turbine includes:

[0018] The guide of the power turbine includes a primary guide and a secondary guide, and the outer diameter of both the primary guide and the secondary guide is greater than Φ1200mm;

[0019] The trailing edge of the blade is scanned using a joint wall measuring instrument to form a cloud map. The characteristic width and characteristic height of the trailing edge of the blade are measured through the cloud map. The throat area of ​​the guide is calculated based on the characteristic width and characteristic height of the trailing edge of the blade.

[0020] As a preferred embodiment, in the step of sequentially assembling the power turbine, the assembly sequence of the power turbine is as follows:

[0021] Assemble the support unit—disassemble the power turbine rotor—assemble the shaft assembly—assemble the second-stage turbine disc—assemble the second-stage guide—assemble the interstage sealing ring—assemble the first-stage turbine disc—assemble the power turbine rotor—assemble the first-stage guide.

[0022] As a preferred embodiment, before the step of docking the gas generator and the power turbine via the rear mounting edge of the first-stage guide of the power turbine, the method further includes the step of disassembling the first-stage guide from the power turbine, lifting and leveling the first-stage guide, and then docking the first-stage guide with the gas generator. When docking the first-stage guide with the gas generator, the front mounting edge of the first-stage guide is first connected and tightened to the outer ring of the rear mounting surface of the low-pressure turbine support ring of the gas generator with screws, and then the inner ring screws are tightened.

[0023] As a preferred embodiment, the portion of the power turbine after the first-stage guide vane is first leveled before being docked with the first-stage guide vane of the already docked gas generator.

[0024] As a preferred embodiment, the portion of the power turbine after the first-stage guide vane is leveled using the following method:

[0025] The support unit of the power turbine is fixed by a sling, which is then connected to a hoist. After the hoist lifts the turbine, the sling is tightened. The effective chain length of the hoist is adjusted according to the stress on the sling to keep the power turbine horizontal.

[0026] As a preferred embodiment, the bolt holes on the rear mounting edge of the first-stage guide and the front mounting edge of the second-stage guide of the power turbine are aligned, and the power turbine is connected by bolts.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] Given the capability to assemble and test gas generators, the method of this invention enables rapid overall machine testing. By assembling and balancing the power turbine rotor sequentially, repeated disassembly and assembly are reduced, facilitating a single, successful installation. Given the large size of the power turbine components, this invention's method, based on the structural characteristics of each unit and the requirements of the testing system, establishes a comprehensive assembly route for the power turbine. Sequential assembly ensures first-time qualification, prevents interference during assembly, meets drawing requirements, and improves assembly efficiency. To facilitate the docking of the gas generator and power turbine, this invention modifies the docking edge. The gas generator and power turbine are docked via the mounting edge after the power turbine's first-stage guide, allowing the inner ring screws to be tightened directly without any tooling. This invention is simple, easy to implement, and eliminates safety hazards, enabling workers to quickly master the docking technology between the power turbine and the gas generator. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 Flowchart of the assembly method for docking the power turbine and the gas generator according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the connection between the gas generator and the power turbine in an embodiment of the present invention;

[0032] Figure 3 A schematic diagram illustrating the calculation of the guide throat area according to an embodiment of the present invention;

[0033] Figure 4 A schematic diagram illustrating the measurement of the cold-state equivalent exhaust area of ​​a single window on a blade according to an embodiment of the present invention;

[0034] Figure 5 Figure 4 Schematic diagram of the BB cross section; Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain other embodiments without creative effort.

[0036] The docking and assembly of the gas generator and the power turbine is of great significance to the processing and manufacturing of gas turbines. Whether the whole machine can be successfully tested depends on whether the performance indicators of the gas generator and the power turbine meet the requirements after installation.

[0037] See Figure 1 This invention provides a method for docking and assembling a power turbine and a gas generator, comprising the following steps:

[0038] S1. Assemble and balance the power turbine rotor in sequence;

[0039] S2. Measure the throat area of ​​the guide tube of the power turbine;

[0040] S3. Perform the assembly of the power turbine in sequence;

[0041] S4. Remove the first-stage guide vane from the power turbine, lift and level the first-stage guide vane, and then connect the first-stage guide vane to the gas generator.

[0042] S5. Connect the gas generator and the power turbine via the first-stage guide post of the power turbine. First, level the part of the power turbine after the first-stage guide post, and then connect it with the first-stage guide post of the already connected gas generator to complete the assembly.

[0043] The power turbine shaft assembly comprises components such as a primary turbine disk and blades, a secondary turbine disk and blades, a shaft, bearing sleeves, a graphite ring, and a sound wheel, with a total weight exceeding 1000 kg. This invention, through repeated trial assembly and adjustments, provides the most reasonable installation sequence, reducing repeated disassembly and assembly, and facilitating installation in one go. In one possible implementation, step S1, which involves sequentially assembling and balancing the power turbine rotor, includes:

[0044] The first-stage turbine disk is assembled with a first-stage disk, first-stage blades and lock plates, and the first-stage turbine disk is statically balanced.

[0045] The second-stage turbine disk is assembled with a second-stage disk, second-stage blades, and lock plates, and then statically balanced.

[0046] Complete the installation of the shaft assembly, which includes a sleeve, graphite ring, and sound wheel, and perform dynamic balancing on the shaft assembly;

[0047] The first-stage turbine disk and the second-stage turbine disk are fitted together by the arc-shaped end teeth of the first-stage turbine disk and the second-stage turbine disk. After the shaft assembly is assembled, the three are connected by multiple tie rods to form a power turbine rotor, and the power turbine rotor is dynamically balanced.

[0048] On the other hand, the throat area is the flow passage of a gas turbine, affecting its power and efficiency performance indicators. Power turbines have a first-stage guide vane and a second-stage guide vane, with outer diameters of Φ1550mm and Φ1650mm respectively. To determine the actual flow area of ​​the guide vane, the throat area must be measured. However, the maximum measurement stroke of existing coordinate measuring machines is only about Φ1200mm. Therefore, in step S2 of this invention's method embodiment, the throat area measured by the coordinate measuring machine is analyzed. A joint wall measuring instrument is used to scan the blade trailing edge, forming a cloud map. The characteristic width and height of the blade trailing edge are measured using this cloud map, and the guide vane throat area is calculated based on these characteristics.

[0049] like Figures 3-5 As shown, Figure 3 This is a schematic diagram of the cross-section for measuring the width of the equivalent exhaust area in the cold state. Figure 3 The mm, pp, and nn sections are the sections used to measure the width. Figure 4 This is a schematic diagram of the cold-state equivalent exhaust area measurement of a single window on a blade. Figure 4 In the middle point C, the starting point for measuring the throat width is indicated, point A is another measurement point, and TW is the width being measured. Figure 5 for Figure 4 The diagram shows the BB section, where G and D are height measuring points and H is the measured height.

[0050] The cold-state equivalent exhaust area F of the low-pressure turbine first-stage guide vane is calculated using the following formula:

[0051]

[0052] The cold equivalent exhaust area Fi of a single window on the blade is calculated using the following formula:

[0053] Fi=(T wni +T wpi +T wmi ) / 3×Hi / 100

[0054] In the above formula:

[0055] Fi represents the cold equivalent exhaust area of ​​a single window, in cm². 2 ;

[0056] T wni The width of the throat at a height Z of 440 mm is expressed in mm.

[0057] T wpi The width of the throat at the cross-section where the height Z is 392 mm is expressed in mm.

[0058] T wmi The width of the throat at the cross-section where the height Z is 346 mm is expressed in mm.

[0059] H represents the height, in mm;

[0060] The subscript i represents the window number.

[0061] In this embodiment, the throat area and its measurement parameters are shown in Table 1, and the coordinates of the measurement points are shown in Table 2.

[0062] Table 1

[0063]

[0064] Table 2

[0065]

[0066] In one possible implementation, step S3 of the present invention determines the assembly sequence of the power turbine. The power turbine components are large, and the exhaust support plate is formed by welding sheet metal parts. Furthermore, the accumulated tolerances during component machining cause assembly interference. Therefore, during assembly, necessary calibration and grinding are performed while ensuring the functionality of the components. Based on the structural characteristics of each unit of the power turbine and the requirements of the testing system, this embodiment of the present invention assembles the power turbine in the following order: assembling the support unit—disassembling the power turbine rotor—assembling the shaft assembly—assembling the second-stage turbine disc—assembling the second-stage guide—assembling the interstage sealing ring—assembling the first-stage turbine disc—assembling the power turbine rotor—assembling the first-stage guide. This assembly method was obtained through repeated experiments and theoretical calculations. This assembly method ensures that the assembly is qualified on the first attempt, prevents assembly interference, meets drawing requirements, and improves assembly efficiency.

[0067] Finally, the gas generator and power turbine are connected via the first-stage guide vane of the power turbine to complete the assembly. For example... Figure 2 As shown, in the prior art, the original mounting surfaces of the gas generator and the power turbine are connected by screws, with inner and outer ring screws, directly connecting the two components, but the inner ring screws cannot be tightened. Therefore, this embodiment of the invention ensures the connection between the gas generator and the power turbine by changing the mounting cross-section. Analysis of the power turbine structure shows that changing the mounting cross-section to a first-stage guide rail allows the mounting edge to meet the requirements.

[0068] In one possible implementation, step S4 involves first disassembling the first-stage guide from the power turbine, then lifting the first-stage guide with a crane, adjusting its level, and finally connecting the first-stage guide to the gas generator. Specifically, the front mounting edge of the first-stage guide is first connected and tightened to the outer ring of the rear mounting surface of the low-pressure turbine support ring with screws, and then the inner ring screws are tightened. Since the power turbine rotor is not installed at this time, the inner ring screws can be tightened directly without any tooling.

[0069] Step S5 involves leveling the portion of the power turbine after the first-stage guide vane, and then connecting it to the already connected first-stage guide vane of the gas generator. Considering the tight prototyping cycle of the power turbine and the lack of sufficient time to prepare specialized tools for lifting and leveling it, this embodiment of the invention adapts to local conditions, using existing tools and fixtures to achieve the leveling of the power turbine components other than the first-stage guide vane and volute: Two fan-shaped lifting devices supporting the second-stage guide vane are installed on the mounting surface behind the second-stage guide vane, and two 4m long slings are threaded through and installed on the aforementioned fan-shaped lifting points. An 8T hoist and a 2m long sling are assembled, and the sling is fixed to the lifting ring directly above the casing supporting the second-stage guide vane. The two 2m long slings and the 8T hoist are fixed to the crane hook, and the crane is lifted until the slings are taut. Based on the stress on the three slings, the effective chain length of the 8T hoist is adjusted appropriately to keep the power turbine components horizontal.

[0070] Align the bolt holes on the rear mounting surface of the first-stage guide and the front mounting surface of the second-stage guide, install screws and pins and tighten them to complete the docking of the power turbine.

[0071] The present invention provides a method for docking and assembling a power turbine and a gas generator. Under existing conditions, this method is simple and easy to implement, poses no safety hazards, and meets the docking requirements of the gas generator and the power turbine. By following the method proposed in this invention for docking, installing, or commissioning the power turbine and gas generator, installers can quickly master the docking techniques, understand the key technical points of the complete unit assembly, and facilitate the product's fulfillment of delivery conditions.

[0072] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for docking and assembling a power turbine and a gas generator, characterized in that, Includes the following steps: The power turbine rotor is assembled and balanced in sequence. The power turbines are assembled sequentially. The gas generator and the power turbine are connected to each other via the first-stage guide of the power turbine to complete the assembly. The steps of assembling and balancing the power turbine rotor in sequence include: The first-stage turbine disk is assembled with a first-stage disk, first-stage blades and lock plates, and the first-stage turbine disk is statically balanced. The second-stage turbine disk is assembled with a second-stage disk, second-stage blades, and lock plates, and then statically balanced. Complete the installation of the shaft assembly, which includes a sleeve, graphite ring, and sound wheel, and perform dynamic balancing on the shaft assembly; The first-stage turbine disk and the second-stage turbine disk are fitted together by the arc-shaped end teeth of the first-stage turbine disk and the second-stage turbine disk. After the shaft assembly is assembled, the three are connected to form a power turbine rotor, and the power turbine rotor is dynamically balanced. After the steps of assembling and balancing the power turbine rotor in sequence, the method further includes measuring the guide throat area of ​​the power turbine, and guiding the final assembly of the power turbine based on the guide throat area of ​​the power turbine.

2. The method for docking and assembling a power turbine and a gas generator according to claim 1, characterized in that, After the first-stage turbine disk, the second-stage turbine disk, and the shaft assembly are assembled in place, they are connected to form a power turbine rotor by multiple tie rods.

3. The method for docking and assembling a power turbine and a gas generator according to claim 1, characterized in that, The step of measuring the guide throat area of ​​the power turbine includes: The guide of the power turbine includes a primary guide and a secondary guide, and the outer diameter of both the primary guide and the secondary guide is greater than Φ1200mm; The trailing edge of the blade is scanned using a joint wall measuring instrument to form a cloud map. The characteristic width and characteristic height of the trailing edge of the blade are measured through the cloud map. The throat area of ​​the guide is calculated based on the characteristic width and characteristic height of the trailing edge of the blade.

4. The method for docking and assembling a power turbine and a gas generator according to claim 3, characterized in that, In the step of sequentially assembling the power turbine, the assembly sequence of the power turbine is as follows: Assemble the support unit—disassemble the power turbine rotor—assemble the shaft assembly—assemble the second-stage turbine disc—assemble the second-stage guide—assemble the interstage sealing ring—assemble the first-stage turbine disc—assemble the power turbine rotor—assemble the first-stage guide.

5. The method for docking and assembling a power turbine and a gas generator according to claim 4, characterized in that, Before the step of docking the gas generator and the power turbine via the rear mounting edge of the first-stage guide of the power turbine, the process includes disassembling the first-stage guide from the power turbine, lifting and leveling the first-stage guide, and then docking the first-stage guide with the gas generator. When docking the first-stage guide with the gas generator, the front mounting edge of the first-stage guide is first connected and tightened to the outer ring of the rear mounting surface of the low-pressure turbine support ring of the gas generator with screws, and then the inner ring screws are tightened.

6. The method for docking and assembling a power turbine and a gas generator according to claim 5, characterized in that, The section of the power turbine after the first-stage guide is first leveled, and then docked with the first-stage guide of the already docked gas generator.

7. The method for docking and assembling a power turbine and a gas generator according to claim 6, characterized in that, The section after the first-stage guide vane of the power turbine is leveled using the following method: The support unit of the power turbine is fixed by a sling, which is then connected to a hoist. After the hoist lifts the turbine, the sling is tightened. The effective chain length of the hoist is adjusted according to the stress on the sling to keep the power turbine horizontal.

8. The method for docking and assembling a power turbine and a gas generator according to claim 6, characterized in that, Align the bolt holes on the rear mounting edge of the first-stage guide and the front mounting edge of the second-stage guide of the power turbine, and connect them with bolts to achieve docking of the power turbine.

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