A low-pressure turbine guide vane assembly method and its application

Abstract

This invention belongs to the field of mechanical assembly technology and discloses a method and application for assembling a low-pressure turbine guide. It simulates the assembly and welding of a low-pressure turbine guide and an outer casing. During the simulated assembly, no elastic sealing gasket is installed. The axial assembly clearance between the low-pressure turbine guide and the outer casing is achieved by installing a process gasket ring of thickness M. Due to the elastic effect of the elastic sealing gasket, this invention ensures an accurate assembly clearance between the low-pressure turbine guide and the outer casing by installing a process gasket ring of thickness M. The clearance after compression of the elastic sealing gasket is determined to ensure accuracy after installation. A secondary installation is then performed, ensuring stability between the low-pressure turbine guide and the outer casing. Compared to existing methods, this method provides a more secure fixation. Different numbers of adjusting bolts are placed on the positioning ring, allowing for very tight contact with the part's surface. By rotating the bolts, the positioning ring is driven to press the outer casing downwards and separate it upwards, enabling precise fine-tuning of the axial local runout of the outer casing.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly technology, specifically a method for assembling a low-pressure turbine guide vane and its application. Background Technology

[0002] For complex cavity-type combined workpieces, such as low-pressure turbine guides for aero-engines, the currently common process of assembling the low-pressure turbine guide with the inner assembly unit and the outer casing for combined machining can achieve the machining of complex cavity-type combined workpieces to a certain extent, but this method has obvious drawbacks in practical applications.

[0003] First, the circumferential and axial positioning and fixing of the low-pressure turbine guide vane welded to the inner assembly unit and the outer casing during assembly is a critical step. If the fixing is not secure, displacement or deviation can easily occur during machining, leading to a decrease in machining accuracy. Second, because the assembly process requires multiple clamping and adjustments, it not only increases the machining difficulty and cost but also easily introduces additional errors, affecting the final assembly quality of the workpiece. Furthermore, if the inner assembly unit and the outer casing cannot be successfully assembled after machining, it will directly lead to the scrapping of the workpiece, resulting in a waste of materials and resources, and will also fail to meet the requirements of the design drawings, affecting the overall performance and reliability of the product. Summary of the Invention

[0004] The present invention provides a method for assembling a low-pressure turbine guide and its application, which solves the problem of unreliable fixing of the traditional low-pressure turbine guide to the outer casing.

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

[0006] A method for assembling a low-pressure turbine guide vane includes:

[0007] The low-pressure turbine guide and outer casing are simulated for assembly and welding. During the simulated assembly, no elastic sealing gasket is installed. The axial assembly clearance between the low-pressure turbine guide and the outer casing is achieved by installing a process gasket ring with a thickness of M.

[0008] After simulating assembly, the circumferential pin holes are machined, and then the welded low-pressure turbine guide is separated from the outer casing.

[0009] Secondary assembly is performed, including assembling and welding the low-pressure turbine guide and the outer casing, while installing elastic sealing gaskets.

[0010] The assembly clearance between the welded low-pressure turbine guide and the outer casing is M±0.1mm.

[0011] Preferably, the process gasket is clamped at the contact surface between the welded low-pressure turbine guide and the outer casing.

[0012] Preferably, during simulated installation, the positioning ring is connected to the mounting edge of the outer casing using a set of fixing bolts.

[0013] Preferably, during simulated installation, the positioning sleeve is pressed tightly against the upper end face of the welded low-pressure turbine guide by adjusting the bolts to ensure the axial assembly clearance M±0.1mm.

[0014] Preferably, the circumferential pin hole extends through the outer casing and the welded low-pressure turbine guide.

[0015] Preferably, the elastic sealing gasket includes a first elastic sealing gasket and a second elastic sealing gasket, which are respectively installed in the groove of the welded low-pressure turbine guide.

[0016] Preferably, after installation, the first and second elastic sealing gaskets protrude from the groove end face and fit against the outer casing.

[0017] Preferably, after the welded low-pressure turbine guide and the outer casing are separated, the welded low-pressure turbine guide and the outer casing are cleaned separately.

[0018] Preferably, the secondary processing steps are as follows: the outer casing, the first elastic sealing gasket, the second elastic sealing gasket, the welded low-pressure turbine guide, and the positioning pin are assembled in sequence. The positioning pin passes through the outer casing and the welded low-pressure turbine guide. The assembly tooling is pressed into place on the upper end face of the welded low-pressure turbine guide. The adjusting bolts are tightened and loosened to ensure the axial assembly clearance M±0.1mm.

[0019] An application of a low-pressure turbine guide assembly method in the assembly of a welded low-pressure turbine guide with an outer casing.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for assembling a low-pressure turbine guide. First, it simulates the assembly and welding of the low-pressure turbine guide and the outer casing. During the simulated assembly, the elastic sealing gasket is not installed. The axial assembly gap between the low-pressure turbine guide and the outer casing is achieved by installing a process gasket ring with a thickness of M. Due to the elastic effect of the elastic sealing gasket, the present invention ensures the accurate assembly gap between the low-pressure turbine guide and the outer casing by installing a process gasket ring with a thickness of M, and determines the gap after the elastic sealing gasket is compressed to ensure the accuracy after installation. Then, a secondary installation is performed to ensure the stability between the low-pressure turbine guide and the outer casing. The fixation is more reliable than the existing methods.

[0021] Furthermore, by setting different numbers of adjusting bolts on the positioning ring, the lower end face of the positioning ring of the fixture is completely fitted with the upper surface of the outer casing, which can make very tight contact with the surface of the part. By rotating the bolts, the positioning ring is driven to press the outer casing downwards and separate the outer casing upwards. The adjustable bolts are tightened or loosened to adjust the upper end face of the inner and outer casings to fit firmly with the end face of the positioning sleeve, which can achieve precise fine adjustment of the axial local runout of the outer casing. Attached Figure Description

[0022] Figure 1 This is a flowchart of a low-pressure turbine guide assembly method according to the present invention;

[0023] Figure 2 This is a diagram showing an embodiment of the invention without the elastic sealing gasket installed.

[0024] Figure 3 A diagram showing the installation of an elastic sealing gasket in an embodiment of the present invention;

[0025] Figure 4 A three-dimensional view of the low-pressure turbine guide assembly positioning device of the present invention;

[0026] Figure 5 This is a cross-sectional view of the low-pressure turbine guide assembly positioning device of the present invention;

[0027] Figure 6 Top view of the low-pressure turbine guide assembly positioning device of the present invention;

[0028] In the diagram: 1-locating ring, 2-locating sleeve, 3-fixing bolt, 4-adjusting bolt, 5-washer ring, 6-locating pin, 7-first elastic sealing gasket, 8-second elastic sealing gasket, 9-low-pressure turbine guide, 10-outer casing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, this invention provides a method for assembling a low-pressure turbine guide. When assembling the welded low-pressure turbine guide 9 with the outer casing 10, it is necessary to ensure that the axial clearance M between the mating surfaces of the two elastic sealing gaskets after compression is M ± 0.1 mm, with circumferential angular position control, including:

[0037] The low-pressure turbine guide 9 and the outer casing 10 are simulated for assembly and welding in S101. During the simulated assembly, no elastic sealing gasket is installed. The axial assembly gap between the low-pressure turbine guide 9 and the outer casing 10 is achieved by installing a process gasket ring with a thickness of M.

[0038] After the S102 simulation assembly is completed, the circumferential pin holes are machined, and then the welded low-pressure turbine guide 9 is separated from the outer casing 10.

[0039] S103 undergoes secondary assembly, assembling and welding the low-pressure turbine guide 9 and the outer casing 10, while also installing elastic sealing gaskets.

[0040] The assembly clearance between the welded low-pressure turbine guide 9 and the outer casing 10 is M±0.1mm.

[0041] First, without installing the first elastic sealing gasket 7 and the first elastic sealing gasket 8, simulate the assembly and welding of the low-pressure turbine guide 9 and the outer casing 10. The axial assembly clearance is achieved by installing a process gasket ring of thickness M. The circumferential position is controlled by a pin passing through the pin hole on the outer casing 10 and the welded low-pressure turbine guide 9. The locating pin 6 has a clearance fit with the pin hole. Figure 2 As shown. After simulated assembly, the circumferential pin holes are machined to the final dimensions. Then, the welded low-pressure turbine guide 9, outer casing 10, and assembly device are disassembled and cleaned.

[0042] The low-pressure turbine guide 9, which is assembled and welded in the second stage, is fixed to the outer casing 10, the first elastic sealing gasket 7, the first elastic sealing gasket 8, and the circumferential positioning pin, thereby achieving precise positioning in the circumferential and axial directions.

[0043] During simulated assembly: 1. A process gasket ring of thickness M is clamped at the mating surface of the welded low-pressure turbine guide 9 and the outer casing 10. The first elastic sealing gasket 7 and the first elastic sealing gasket 8 are not installed. 2. A pin is passed through the pin holes on the outer casing 10 and the welded low-pressure turbine guide 9. 3. The locating ring is connected to the mounting edge of the outer casing 10 using a set of fixing bolts. 4. The locating sleeve is pressed against the upper end face of the welded low-pressure turbine guide 9 using adjusting bolts, ensuring that the axial assembly clearance M ± 0.1 mm is acceptable. 5. The circumferential locating pin hole is machined to its final size. The locating pin hole passes through the outer casing 10 and the welded low-pressure turbine guide 9, ensuring that the inner and outer parts are machined simultaneously. Figure 3 As shown in Figure 6, the formal assembly involves assembling the outer casing 10, the first elastic sealing gasket 7, the first elastic sealing gasket 8, the welded low-pressure turbine guide 9, and the locating pin. The locating pin passes through the outer casing 10 and the welded low-pressure turbine guide 9. The tooling is then tightened into place, and the upper end face of the welded low-pressure turbine guide 9 is secured. The adjusting bolts are tightened and loosened to ensure that the axial assembly clearance M ± 0.1 mm is within acceptable limits. This ensures that the elastic sealing gaskets seal the parts and that the elastic compression meets the design requirements.

[0044] The circumferential direction of the external and internal parts is fixed by the positioning pin 6 through the precision hole on the low-pressure turbine guide 9 and the outer casing 10 (the hole diameter is left with a margin during the simulated assembly).

[0045] The axial clearance M±0.1 is ensured by using process shims 5;

[0046] By tightly fitting the mounting edge of the outer casing 10 to the positioning ring 1 and the fixing bolt 3, the positioning ring 1 and the fixing bolt 3 are connected as one unit.

[0047] By adjusting the bolt 4 by tightening it downwards and loosening it upwards, the positioning sleeve 2 is driven to adjust the axial assembly dimension M between the welded low-pressure turbine guide 9 and the outer casing 10, so that the assembly gap after the elastic sealing gasket is installed on the parts is controlled within a certain range, thereby achieving effective control of the circumferential direction and circumferential dimensions during assembly.

[0048] Another embodiment of the present invention provides a method for assembling a low-pressure turbine guide.

[0049] During operation, the positioning ring 1 secures the mounting edge of the outer casing 10 to the positioning ring 1 using the fixing bolts 3. The positioning sleeve 2 presses against the end face of the low-pressure turbine guide 9 welded to the inner assembly unit. The positioning pin 6 passes through the outer casing 10 and the welded low-pressure turbine guide 9 and is inserted into the circumferential hole to ensure that the outer casing 10 and the welded low-pressure turbine guide 9 are positioned circumferentially. The adjusting bolts 4 are tightened downwards to press the positioning sleeve, ensuring that the welded low-pressure turbine guide 9 is assembled in the axial position. The positioning ring 5 ensures the assembly clearance M. The fixing bolts 3 and adjusting bolts 4 ensure the axial dimension position is fixed, and the positioning pin 6 fixes the circumferential position, thus realizing the assembly of the outer casing 10 and the welded low-pressure turbine guide 9. After assembly and tightening, the side assembly holes are machined for assembly. The outer casing 10 and the welded low-pressure turbine guide 9 are disassembled and cleaned. The outer casing 10, the first elastic sealing gasket 7, the first elastic sealing gasket 8, and the welded low-pressure turbine guide 9 are then assembled. The mounting edge of the outer casing 10 is tightly fixed to the positioning ring 1 using the fixing bolts 3. The positioning sleeve 2 is pressed against the end face of the welded low-pressure turbine guide 9 in the inner assembly unit. Assembly pins are inserted through the outer casing 10 and the welded low-pressure turbine guide 9 into the circumferential holes to ensure that the outer casing 10 and the welded low-pressure turbine guide 9 are positioned circumferentially. The adjusting bolts 4 are tightened downwards to press the positioning sleeve, ensuring the assembly clearance M of the welded low-pressure turbine guide 9. This achieves precise axial and circumferential assembly of the outer casing 10 and the welded low-pressure turbine guide 9.

[0050] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art, guided by the specification, can make many other modifications without departing from the scope of the claims of the present invention, and all of these modifications are within the scope of protection of the present invention.

Claims

1. A method for assembling a low-pressure turbine guide vane, characterized in that, include: The low-pressure turbine guide (9) and the outer casing (10) are simulated for assembly and welding. During the simulated assembly, no elastic sealing gasket is installed. The axial assembly gap between the low-pressure turbine guide (9) and the outer casing (10) is achieved by installing a process gasket ring with a thickness of M. After simulating assembly, the circumferential pin holes are machined, and then the welded low-pressure turbine guide (9) is separated from the outer casing (10); Secondary assembly is performed, and the low-pressure turbine guide (9) and outer casing (10) are assembled and welded together, while elastic sealing gaskets are installed. The assembly clearance between the welded low-pressure turbine guide (9) and the outer casing (10) is M±0.1mm; During the simulated installation, the positioning sleeve (2) is pressed against the upper end face of the welded low-pressure turbine guide (9) by adjusting the bolt (4) to ensure the axial assembly clearance M ± 0.1 mm; The elastic sealing gasket includes a first elastic sealing gasket (7) and a second elastic sealing gasket (8), which are respectively installed in the groove of the welded low-pressure turbine guide (9); The specific steps of the secondary processing are as follows: the outer casing (10), the first elastic sealing gasket (7), the second elastic sealing gasket (8), the welded low-pressure turbine guide (9) and the positioning pin (6) are assembled in sequence. The positioning pin (6) passes through the outer casing (10) and the welded low-pressure turbine guide (9). The upper end face of the welded low-pressure turbine guide (9) is pressed into place by the assembly tooling. The adjusting bolt (4) is tightened and loosened to ensure the axial assembly clearance M±0.1mm.

2. The method for assembling a low-pressure turbine guide vane according to claim 1, characterized in that, The process gasket (5) is clamped at the contact surface between the welded low-pressure turbine guide (9) and the outer casing (10).

3. The method for assembling a low-pressure turbine guide vane according to claim 1, characterized in that, During simulated installation, the positioning ring (1) is connected to the mounting edge of the outer casing (10) by a set of fixing bolts (3).

4. The method for assembling a low-pressure turbine guide vane according to claim 1, characterized in that, A circumferential pin hole runs through the outer casing (10) and the welded low-pressure turbine guide (9).

5. The method for assembling a low-pressure turbine guide vane according to claim 1, characterized in that, After installation, the first elastic sealing gasket (7) and the second elastic sealing gasket (8) protrude from the groove end face and fit against the outer casing (10).

6. The method for assembling a low-pressure turbine guide vane according to claim 1, characterized in that, After the welded low-pressure turbine guide (9) and the outer casing (10) are separated, the welded low-pressure turbine guide (9) and the outer casing (10) are cleaned respectively.

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