Low pressure turbine rotor-stator assembly and method of assembling same

Abstract

The present disclosure relates to a low-pressure turbine rotor-stator assembly device and an assembly method thereof. The low-pressure turbine rotor-stator assembly device comprises a base and a rotor adapter assembly arranged on the base, the rotor adapter assembly comprising a rotor adapter seat and a plurality of hook-shaped pressing plate mechanisms arranged on the rotor adapter seat, the hook-shaped pressing plate mechanisms having hook-shaped force applying members that are rotatable and movable up and down, the hook-shaped force applying members being configured to apply a downward force above the rotor adapter seat to press the low-pressure turbine first stage disk on the rotor adapter seat. Before the low-pressure turbine first stage disk is placed, the hook-shaped pressing plate mechanisms are moved upward and turned inward to avoid hindering the placement of the low-pressure turbine first stage disk; after the low-pressure turbine first stage disk is placed, the hook-shaped pressing plate mechanisms are turned outward and moved downward to press the low-pressure turbine first stage disk, thereby ensuring that the low-pressure turbine first stage disk is closely attached to the tooling, and the low-pressure turbine first stage disk has the characteristics of convenient clamping, stability and reliability, thereby greatly improving the assembly efficiency.

Description

Technical Field

[0001] This disclosure relates to a low-pressure turbine rotor-stator assembly device and its assembly method. Background Technology

[0002] The statements herein are provided only as background information in connection with this disclosure and do not necessarily constitute prior art.

[0003] The low-pressure turbine of a high-bypass commercial aero-engine mainly consists of two parts: a rotor and a stator. Compared to military aero-engines, it has more rotor and stator stages and a larger diameter, making assembly more challenging. Designing and manufacturing a fully functional, structurally sound, and easy-to-operate low-pressure turbine rotor-stator assembly device, and developing a complete assembly process plan, are key factors in ensuring high-quality assembly of the low-pressure turbine. Besides being able to lower the rotor as a whole or lift the stator as a whole, the assembly device should also possess high rotational accuracy to facilitate the measurement of the rotor-stator honeycomb surface and disk center runout, and high clamping accuracy to ensure that the reference surface does not shift during the step-by-step assembly process.

[0004] The existing assembly equipment suffers from insufficient rotational accuracy, failing to meet the requirements for measuring the runout of the sub-cell surface, rotor disk center, and end faces. Furthermore, the assembly equipment lacks sufficient clamping precision on the datum surface, leading to datum offset after assembly and necessitating repeated datum measurements during the assembly process. Additionally, after the stator and rotor are assembled, the rotor section cannot rotate, making it impossible to inspect for rotor blade damage in the assembled state, posing a potential quality hazard. The existing assembly equipment requires measurements to be performed on a precision turntable, and the installation of components such as sector blocks and outer ring blocks necessitates hammering, impacting the turntable's accuracy and lifespan. Summary of the Invention

[0005] One of the technical problems to be solved by this disclosure is to provide a low-pressure turbine rotor-stator assembly device and its assembly method, which can improve assembly efficiency and stability and reliability.

[0006] A low-pressure turbine stator assembly device according to some embodiments of the present disclosure includes: a base; and a rotor transfer assembly disposed on the base, which includes a rotor transfer seat and a plurality of hook-shaped pressure plate mechanisms disposed on the rotor transfer seat. The hook-shaped pressure plate mechanisms have rotatable and vertically movable hook-shaped force-applying members configured to apply a downward force above the rotor transfer seat to press the low-pressure turbine first-stage disk on the rotor transfer seat.

[0007] In some embodiments, a receiving cavity is formed inside the rotor adapter, and a plurality of hook-shaped pressure plate mechanisms are disposed on the inner wall of the rotor adapter.

[0008] In some embodiments, the hook-shaped pressure plate mechanism includes an L-shaped pressure plate as a hook-shaped force-applying component and a driving component. The driving component includes a rotating cylinder and a telescopic cylinder that respectively drive the L-shaped pressure plate to rotate and move up and down.

[0009] In some embodiments, a plurality of hook-shaped pressure plate mechanisms are arranged at equal intervals in the circumferential direction of the rotor adapter.

[0010] In some embodiments, it includes 4 to 6 hook-shaped pressure plate mechanisms.

[0011] In some embodiments, a rotor support ring disposed on a rotor adapter is also included, configured to support the low-pressure turbine first-stage disk.

[0012] In some embodiments, the device further includes a plurality of tilting blocks and a plurality of adjusting bolts. The adjusting bolts are threadedly connected to the rotor support ring. The tilting blocks are movably disposed within the rotor support ring. By rotating the adjusting bolts, the tilting blocks can protrude from the upper end face of the rotor support ring along the height direction to abut against the low-pressure turbine first-stage disk.

[0013] In some embodiments, a rotary mounting base is also included, through which the rotor adapter assembly is rotatably mounted on a base, the rotary mounting base including a rotary air-bearing platform.

[0014] In some embodiments, the rotary assembly further includes a hydraulic clamping mechanism, and the rotor transfer assembly further includes a rotor support shaft disposed at the bottom of the rotor transfer assembly, which is disposed within the hydraulic clamping mechanism to enable the rotor transfer assembly to be mounted on the rotary assembly.

[0015] An assembly method according to some embodiments of this disclosure, applied to the aforementioned low-pressure turbine rotor-stator assembly device, includes:

[0016] Before placing the low-pressure turbine first-stage disk, control the hook-shaped pressure plate mechanism to move upward and rotate inward;

[0017] After placing the low-pressure turbine first-stage disk, control the hook-shaped pressure plate mechanism to rotate outward and move downward to press it against the low-pressure turbine first-stage disk.

[0018] In the technical solution disclosed herein, multiple hook-shaped pressure plate mechanisms are set on the rotor adapter seat. The hook-shaped pressure plate mechanisms have rotatable and vertically movable hook-shaped force-applying components. Before placing the low-pressure turbine first-stage disk, the hook-shaped pressure plate mechanisms move upward and rotate inward to avoid obstructing the placement of the low-pressure turbine first-stage disk. After placing the low-pressure turbine first-stage disk, the hook-shaped pressure plate mechanisms rotate outward and move downward to press the low-pressure turbine first-stage disk tightly, ensuring that the low-pressure turbine first-stage disk fits tightly with the tooling. It has the characteristics of convenient clamping and stable reliability, thereby greatly improving the assembly efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view structural schematic diagram of some embodiments of the low-pressure turbine rotor-stator assembly device according to the present disclosure;

[0021] Figure 2 This is a top view schematic diagram of some embodiments of the low-pressure turbine rotor-stator assembly device according to the present disclosure;

[0022] Figure 3 This is a cross-sectional view during assembly of some embodiments of the low-pressure turbine rotor-stator assembly apparatus according to the present disclosure.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Base; 2. Rotary mounting base; 3. Rotor adapter assembly; 4. Low-pressure turbine first stage disc; 5. Low-pressure turbine casing; 6. Stator mounting base; 31. Rotor support ring; 32. Rotor support shaft; 33. Hook-shaped pressure plate mechanism; 34. Rotor adapter base. Detailed Implementation

[0025] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0026] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0027] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0028] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0030] Combination Figures 1-3 As shown, a low-pressure turbine stator assembly device according to some embodiments of the present disclosure includes: a base 1 and a rotor adapter assembly 3, wherein the rotor adapter assembly 3 is disposed on the base 1, and includes a rotor adapter seat 34 and a plurality of hook-shaped pressure plate mechanisms 33. The hook-shaped pressure plate mechanisms 33 are disposed on the rotor adapter seat 34, and the hook-shaped pressure plate mechanisms 33 have rotatable and vertically movable hook-shaped force-applying members, which are configured to apply a downward force above the rotor adapter seat 34 to press the low-pressure turbine first-stage disk 4 on the rotor adapter seat 34.

[0031] In this illustrative embodiment, by providing multiple hook-shaped pressure plate mechanisms 33 on the rotor adapter 34, each hook-shaped pressure plate mechanism 33 has a rotatable and vertically movable hook-shaped force-applying component. Before placing the low-pressure turbine first-stage disk 4, the hook-shaped pressure plate mechanism 33 moves upward and rotates inward to avoid obstructing the placement of the low-pressure turbine first-stage disk 4. After placing the low-pressure turbine first-stage disk 4, the hook-shaped pressure plate mechanism 33 rotates outward and moves downward to press the low-pressure turbine first-stage disk 4, ensuring that the low-pressure turbine first-stage disk 4 fits tightly with the tooling. This method features convenient clamping and stable and reliable operation, thereby greatly improving assembly efficiency.

[0032] Combination Figures 1-3 As shown, in some embodiments, a receiving cavity is formed inside the rotor adapter 34, and multiple hook-shaped pressure plate mechanisms 33 are disposed on the inner wall of the rotor adapter 34. The arrangement of the receiving cavity provides accommodating space for the multiple hook-shaped pressure plate mechanisms 33, which can reduce the space occupied, optimize the structural design, and has high feasibility.

[0033] Regarding how to achieve the rotation and vertical movement of the hook-shaped force-applying component of the hook-shaped pressure plate mechanism 33, in some embodiments, the hook-shaped pressure plate mechanism 33 includes an L-shaped pressure plate as the hook-shaped force-applying component and a driving component. The driving component includes a rotating hydraulic cylinder and a telescopic hydraulic cylinder that respectively drive the L-shaped pressure plate to rotate and move vertically. Using hydraulic cylinders to achieve the rotation and vertical movement of the hook-shaped force-applying component is stable and reliable, ensuring clamping stability. Hydraulic cylinders are easy to obtain and install, making it highly feasible. In other embodiments, the driving component can be an electric component.

[0034] To ensure compression stability and uniformity, such as Figure 2 As shown, in some embodiments, multiple hook-shaped pressure plate mechanisms 33 are arranged at equal intervals in the circumferential direction of the rotor adapter 34. In some embodiments, 4 to 6 hook-shaped pressure plate mechanisms 33 are included. Setting 4 to 6 hook-shaped pressure plate mechanisms 33 can achieve better clamping stability and is a reasonable arrangement.

[0035] To facilitate adjustment, in some embodiments, the low-pressure turbine stator assembly device also includes a rotor support ring 31 disposed on the rotor adapter 34. The rotor support ring 31 is configured to support the low-pressure turbine first-stage disk 4. By setting the rotor support ring 31, the low-pressure turbine first-stage disk 4 can be tilted, further improving the assembly efficiency.

[0036] Regarding how to tilt the first-stage disk of the low-pressure turbine, in some embodiments, the low-pressure turbine rotor-stator assembly device further includes multiple tilting blocks and multiple adjusting bolts. The adjusting bolts are threadedly connected to the rotor support ring 31. The tilting blocks are movably disposed within the rotor support ring 31. By rotating the adjusting bolts, the tilting blocks can protrude from the upper end face of the rotor support ring 31 along the height direction of the rotor support ring 31 to abut against the first-stage disk 4 of the low-pressure turbine. The adjustment is convenient and reliable, and the adjusting bolts will not cause wear to the first-stage disk 4 of the low-pressure turbine, thus having high feasibility.

[0037] like Figure 1 As shown, in some embodiments, the low-pressure turbine stator assembly device further includes a rotating assembly base 2, and the rotor transfer assembly 3 is rotatably mounted on the base 1 via the rotating assembly base 2. The rotating assembly base 2 includes a rotating air-bearing platform. The rotor transfer assembly 3 can rotate during the assembly process, facilitating the inspection of rotor blade damage in the assembled state. The use of a rotating air-bearing platform achieves a stable and reliable connection between the rotating assembly base 2 and the rotor transfer assembly 3, with high clamping accuracy and reliability, and high feasibility.

[0038] like Figure 1 and Figure 3As shown, in some embodiments, the rotary assembly base 2 further includes a hydraulic clamping mechanism, and the rotor transfer assembly 3 further includes a rotor support shaft 32 disposed at the bottom of the rotor transfer base 34, which is disposed within the hydraulic clamping mechanism to enable the rotor transfer assembly 3 to be mounted on the rotary assembly base 2. By setting up the hydraulic clamping mechanism, reliable clamping of the assembly datum is achieved, and there is no need to repeatedly align the datum during the assembly process, which greatly improves the assembly efficiency.

[0039] In some embodiments, such as Figure 3 As shown, the low-pressure turbine rotor-stator assembly device also includes a stator assembly seat 6 mounted on a fixed platform of the rotating assembly seat 2, which can be firmly fixed, thus allowing for the practical need to perform hammering during the assembly process. This allows the low-pressure turbine rotor and stator to be supported separately on the assembly seats, meeting the practical need to inspect the flow channel for damage and foreign matter after assembly. Furthermore, it achieves integrated assembly and measurement of the low-pressure turbine rotor-stator assembly, greatly improving the assembly efficiency of the low-pressure turbine rotor-stator.

[0040] Accordingly, an assembly method provided by some embodiments of this disclosure is applied to the aforementioned low-pressure turbine stator assembly device, comprising: before placing the low-pressure turbine first-stage disk 4, controlling the hook-shaped pressure plate mechanism 33 to move upward and rotate inward to avoid obstructing the placement of the low-pressure turbine first-stage disk 4; after placing the low-pressure turbine first-stage disk 4, controlling the hook-shaped pressure plate mechanism 33 to rotate outward and move downward to press the low-pressure turbine first-stage disk 4 tightly, ensuring that the low-pressure turbine first-stage disk 4 is closely fitted with the tooling, which has the characteristics of convenient clamping and stable reliability, thereby greatly improving the assembly efficiency.

[0041] The following is based on Figures 1-3 The assembly process is illustrated below using the example shown:

[0042] (1) Place the rotor support shaft 32 on the rotating assembly seat 2, adjust the hydraulic clamping mechanism so that the hydraulic pressure is between 1000 and 1500 PSI, check the runout of the mating end face and radial surface of the low-pressure turbine first stage disk 4, record the actual value, rotate the rotor support shaft 32 to 4 angular positions, select the appropriate angular position for marking, and remove the rotor support shaft 32.

[0043] (2) Place the stator assembly 6 on the fixed platform of the rotating assembly 2 and transfer it through the stator adapter. At the same time, adjust the radial position of the stator assembly 6 by adjusting the screw and fix it with screws and nuts so that the runout of the cylindrical surface of the rotating assembly 2 and the stator housing does not exceed 0.01mm.

[0044] (3) Place the riveting assembly of the low-pressure turbine casing 5 onto the stator assembly seat 6, install the first-stage outer ring welding assembly, and after installation, use a magnetic meter stand to measure the radial runout of the first-stage outer ring welding assembly and record the actual value.

[0045] (4) Install the rotor adapter 3 on the rotating mounting base 2, use dry ice to cool the stop where the rotor support shaft 32 and the disk center of the low-pressure turbine first-stage disk 4 meet, or heat the disk center of the low-pressure turbine first-stage disk 4, install the low-pressure turbine first-stage disk 4, and press it with the hook-shaped pressure plate mechanism 33, and leave it for 30 minutes to restore room temperature.

[0046] (5) Measure the runout of the upper end face and the cylindrical surface of the disk center of the low-pressure turbine first stage disk 4. The runout value should be less than 0.01mm.

[0047] (6) Assemble the second to sixth level discs one by one, and measure the runout of the rotor and stator as required. Since the mating surface of the first level disc is an interference fit and is firmly attached to the hydraulic chuck, the reference will not be offset, thus greatly improving the assembly efficiency.

[0048] (7) Remove the assembled low-pressure turbine rotor-stator unit, loosen the hydraulic clamping mechanism, and use the rotor-stator centering lifting tool to lift the assembled low-pressure turbine rotor-stator unit and rotor support shaft 32 and place them on the assembly table surface.

[0049] (8) Use the disassembly tool provided with the tooling to separate the rotor support shaft and complete the assembly of the low-pressure turbine rotor-stator unit.

[0050] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0051] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A low-pressure turbine rotor-stator assembly device, characterized in that, include: Base (1); The rotor adapter assembly (3) is disposed on the base (1) and includes a rotor adapter seat (34) and a plurality of hook-shaped pressure plate mechanisms (33). The hook-shaped pressure plate mechanisms (33) are disposed on the rotor adapter seat (34) and have rotatable and vertically movable hook-shaped force-applying members. The hook-shaped force-applying members are configured to apply a downward force above the rotor adapter seat (34) to press the low-pressure turbine first-stage disk (4) on the rotor adapter seat (34). A rotor support ring (31) is disposed on the rotor adapter (34) and is configured to support the low-pressure turbine first stage disk (4); Multiple tilting blocks, which are movably disposed within the rotor support ring (31); and Multiple adjusting bolts are threadedly connected to the rotor support ring (31). By rotating the adjusting bolts, the tilting block can protrude from the upper end face of the rotor support ring (31) along the height direction to abut against the low-pressure turbine first stage disk (4).

2. The low-pressure turbine rotor-stator assembly device according to claim 1, characterized in that, The rotor adapter (34) has a receiving cavity, and a plurality of hook-shaped pressure plate mechanisms (33) are disposed on the inner wall of the rotor adapter (34).

3. The low-pressure turbine rotor-stator assembly device according to claim 1, characterized in that, The hook-shaped pressure plate mechanism (33) includes an L-shaped pressure plate as a hook-shaped force-applying component and a driving component. The driving component includes a rotating cylinder and a telescopic cylinder that drive the L-shaped pressure plate to rotate and move up and down, respectively.

4. The low-pressure turbine rotor-stator assembly device according to claim 1, characterized in that, Multiple hook-shaped pressure plate mechanisms (33) are arranged at equal intervals in the circumferential direction of the rotor adapter (34).

5. The low-pressure turbine rotor-stator assembly device according to claim 1, characterized in that, Includes 4 to 6 of the hook-shaped pressure plate mechanisms (33).

6. The low-pressure turbine rotor-stator assembly device according to any one of claims 1 to 5, characterized in that, It also includes a rotating assembly base (2), the rotor transfer assembly (3) being rotatably mounted on the base (1) via the rotating assembly base (2), the rotating assembly base (2) including a rotating air-bearing platform.

7. The low-pressure turbine rotor-stator assembly device according to claim 6, characterized in that, The rotary assembly base (2) further includes a hydraulic clamping mechanism, and the rotor transfer assembly (3) further includes a rotor support shaft (32) disposed at the bottom of the rotor transfer base (34), which is disposed within the hydraulic clamping mechanism, so as to realize that the rotor transfer assembly (3) is installed on the rotary assembly base (2).

8. An assembly method, applied to the low-pressure turbine rotor-stator assembly device according to any one of claims 1 to 7, comprising: Before placing the low-pressure turbine first-stage disk (4), control the hook-shaped pressure plate mechanism (33) to move upward and rotate inward; After the low-pressure turbine first-stage disk (4) is placed, the hook-shaped pressure plate mechanism (33) is controlled to rotate outward and move downward so as to press the low-pressure turbine first-stage disk (4) tightly.

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