Low pressure turbine guide vane and nozzle assembly gap control device and method

Abstract

The application discloses a low-pressure turbine guide vane and flow guide pipe assembly gap control device and method, and belongs to the field of aero-engines.The low-pressure turbine guide vane and flow guide pipe assembly gap control device comprises a blade large-end transverse shape correcting die, a blade large-end longitudinal shape correcting die, a blade small-end transverse shape correcting die and a blade small-end longitudinal shape correcting die.The blade large-end transverse shape correcting die comprises a first force transmission structure, a first screw assembly and a first working block.The first screw assembly is connected to the tail end of the first force transmission structure.The low-pressure turbine guide vane and flow guide pipe assembly gap control device and method can effectively control the gap between the blade and the flow guide pipe, and the gap is increased from not more than 0.2 mm to not more than 0.05 mm, and can be widely applied to the development and batch production of all low-pressure turbine guide vanes involving welded flow guide pipes, and greater economic benefits are created.

Description

Technical Field

[0001] This invention relates to the fields of structural design and application technology in the field of aero-engines, and in particular provides a device and method for controlling the assembly clearance between a low-pressure turbine guide vane and a guide tube. Background Technology

[0002] With the increasing thrust-to-weight ratio of aero-engines, the technical specifications of blades, as core components of aero-engines, are also increasing. Hollow guide vanes generally require the installation of guide tubes within the blade cavity to cool the blade in its high-temperature operating environment. Previously, the clearance between the guide vane and the guide tube was generally required to be no greater than 0.2 mm. With the development of guide vane technology, the requirement for the assembly clearance between the blade and the guide tube has gradually increased to no greater than 0.05 mm. A hollow low-pressure turbine guide vane is a twin-cast structure; a schematic diagram of the blade structure is shown below. Figure 1 The hollow blade needs to be fitted with a guide tube inside its cavity, and the assembly gap between the blade and the guide tube must not exceed 0.05 mm. A schematic diagram of the guide tube structure can be found here. Figure 4 The blade's surface to be assembled is a cast surface, while the guide tube is manufactured using sheet metal forming. Therefore, the assembly gap between the blade and the guide tube is actually the gap between the blade's cast surface and the sheet metal part. The casting surface and the sheet metal part have low precision, with a cumulative tolerance far exceeding 0.05mm. Existing assembly methods cannot meet the technical requirement of an assembly gap between the blade and the guide tube not exceeding 0.05mm. Therefore, inventing an assembly method that ensures the blade-guide tube assembly gap is no greater than 0.05mm is of significant importance.

[0003] There is an urgent need for a high-performance device and method for controlling the assembly gap between low-pressure turbine guide vanes and guide tubes. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for controlling the assembly gap between low-pressure turbine guide vanes and guide tubes, which offers superior technical performance. This solves the problem of achieving the required assembly gap between low-pressure turbine guide vanes and guide tubes. The goal is to ensure that the assembly gap between the low-pressure turbine guide vanes and guide tubes meets the technical requirement of no more than 0.05 mm, thus satisfying the performance requirements of the blades.

[0005] The low-pressure turbine guide vane and guide tube assembly gap control device includes: a blade large end lateral straightening mold, a blade large end longitudinal straightening mold, a blade small end lateral straightening mold, and a blade small end longitudinal straightening mold; the blade large end lateral straightening mold includes a first force transmission structure, a first screw assembly, and a first working block; the first screw assembly is connected to the tail end of the first force transmission structure, the tail end of the first working block is connected to the front end of the first force transmission structure, and the top end of the first working block is a straightening working surface for fitting the transverse inner surface of the guide tube large end; the blade large end lateral straightening mold adopts the lever expansion principle, the first screw assembly is a force-applying structure, and the working surface on the first working block is a complex curved surface structure for fitting the transverse inner surface of the guide tube large end. The longitudinal straightening mold for the large end of the blade includes a second force transmission structure, a second screw assembly, and a second working block. The second screw assembly is connected to the tail end of the second force transmission structure, and the tail end of the second working block is connected to the front end of the second force transmission structure. The top of the second working block is a straightening curved surface structure that fits the longitudinal inner surface of the large end of the guide tube. The longitudinal straightening mold for the large end of the blade adopts the lever expansion principle. The second screw assembly at the tail end of the longitudinal straightening mold for the large end of the blade is a force-applying structure. The top of the longitudinal straightening mold for the large end of the blade is a complex curved surface structure that fits the longitudinal inner surface of the large end of the guide tube, which is the working surface. The transverse straightening mold for the small end of the blade includes a positioning base, a third screw assembly, and a wedge block. The positioning base is connected to the blade, and the third screw assembly passes through the positioning base and is connected to the bottom end of the wedge block. The top of the wedge block is a complex curved surface structure that fits the transverse contour of the small end of the guide tube, which is the working surface of the straightening mold. The transverse straightening mold for the small end of the blade adopts a wedge-shaped expansion and flanging principle, with a positioning base used to tighten the wedge block. The longitudinal straightening mold for the small end of the blade includes a fourth screw assembly, a fourth force transmission structure, a fourth working block, and a positioning block. The fourth screw assembly is connected to the tail end of the fourth force transmission structure, and the tail end of the fourth working block is connected to the front end of the fourth force transmission structure. The top of the fourth working block is a straightening curved surface structure that fits the longitudinal inner surface of the small end of the guide tube; it is the working surface of the straightening mold. The positioning block is connected to the blade. The blade is flat and cannot provide stable support for the fourth working block. The positioning block provides an inclined surface to support the fourth working block, thereby enabling the fourth working block to effectively apply tension and achieve the straightening purpose. A positioning surface is provided on the positioning block, which also provides support for the clamping structure. The longitudinal straightening mold for the small end of the blade adopts a hinge clamping principle.

[0006] Preferably, the first force transmission structure is a scissor-shaped force transmission structure.

[0007] Preferably, the second force transmission structure is an H-shaped force transmission structure.

[0008] Preferably, the fourth screw assembly is a hinge screw structure. The hinge screw structure is the force-applying structure of the forming mold. The method for controlling the assembly gap between the low-pressure turbine guide vane and the guide tube employs a device for controlling the assembly gap between the low-pressure turbine guide vane and the guide tube. The specific steps are as follows: Step 1: Select and install the appropriate guide tube into the blade cavity. The appropriate guide tube refers to the guide tubes from the same batch being tested and assembled with the blades from the same batch. The guide tubes with the smallest relative gap between them and the blades are selected as a group, which can reduce the workload of calibration. Step 2: Use the blade large end lateral straightening mold to laterally straighten the large end of the guide tube; Insert the top of the blade large-end lateral straightening mold into the large end of the guide tube. Apply force by tightening the first screw assembly at the tail end of the blade large-end lateral straightening mold to open the top of the blade large-end lateral straightening mold for lateral straightening of the guide tube large end. After the gap between the guide tube and the blade meets the requirements, spot weld it in place. Loosen the first screw assembly 12 and remove the blade large-end lateral straightening mold to complete the lateral straightening of the blade large end. Step 3: Use the blade large end longitudinal straightening mold to longitudinally straighten the large end of the guide tube; Insert the top of the longitudinal alignment mold at the large end of the blade into the large end of the guide tube. Apply force by tightening the second screw assembly at the tail end of the longitudinal alignment mold at the large end of the blade to open the top of the longitudinal alignment mold and perform longitudinal alignment of the large end of the guide tube. After the gap between the guide tube and the blade meets the requirements, spot weld it in place. Loosen the second screw assembly and remove the longitudinal alignment mold at the large end of the blade to complete the longitudinal alignment of the large end of the blade. Step 4: Use the blade small end lateral straightening mold to laterally straighten the small end of the guide tube; Insert the wedge block at the top of the blade small end lateral straightening mold into the small end of the blade guide tube and pass through the guide tube. Install the wedge block at the large end of the guide tube onto the positioning base at the tail end of the blade small end lateral straightening mold. Tighten the screws on the positioning base to tighten the top of the wedge block and perform lateral straightening of the small end of the guide tube. When the gap between the guide tube and the blade meets the requirements, spot weld it in place. Remove the wedge block from the positioning base and take it out. This completes the lateral straightening of the blade small end. Step 5: Use the blade small end longitudinal shaping mold to longitudinally shape the small end of the guide tube; Insert the top of the longitudinal alignment mold for the small end of the blade into the small end of the guide tube. Apply force at the tail end of the fixture by tightening the fourth screw assembly to close the top of the longitudinal alignment mold for the small end of the guide tube and perform longitudinal alignment. Once the gap between the guide tube and the blade meets the requirements, spot weld it in place. Loosen the fourth screw assembly and remove the longitudinal alignment mold for the small end of the blade to complete the entire alignment process.

[0009] The aforementioned low-pressure turbine guide vane and guide tube assembly gap control device and method can effectively control the gap between the vane and the guide tube, increasing the gap from no more than 0.2 mm to no more than 0.05 mm. It can be widely applied in the research and mass production of all low-pressure turbine guide vanes, creating greater economic benefits. Attached Figure Description

[0010] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the blade structure; Figure 2 Schematic diagram of the large end of the blade Figure 3 Schematic diagram of the small end of the blade Figure 4 This is a schematic diagram of the flow guide tube structure; Figure 5 This is a schematic diagram of the longitudinal shaping mold structure for the large end of the blade; Figure 6 A schematic diagram of the transverse straightening mold structure for the large end of the blade; Figure 7 A schematic diagram of the working state of the lateral straightening mold at the small end of the blade; Figure 8 A schematic diagram of the lateral straightening mold structure for the small end of the blade; Figure 9 A schematic diagram of the working state of the longitudinal straightening mold at the small end of the blade; Figure 10 Schematic diagram of the positioning block for the longitudinal alignment mold at the small end; Figure 11 This is a schematic diagram of the longitudinal shaping mold structure for the small end of the blade. Detailed Implementation

[0011] Example 1 The low-pressure turbine guide vane and guide tube assembly gap control device includes: a blade large end lateral straightening mold, a blade large end longitudinal straightening mold, a blade small end lateral straightening mold, and a blade small end longitudinal straightening mold; the blade large end lateral straightening mold includes a first force transmission structure 11, a first screw assembly 12, and a first working block 13; the first screw assembly 12 is connected to the tail end of the first force transmission structure 11, the tail end of the first working block 13 is connected to the front end of the first force transmission structure 11, and the top end of the first working block 13 is a straightening working surface for fitting the transverse inner surface of the guide tube large end; the blade large end lateral straightening mold 1 adopts the lever expansion principle, the first screw assembly 12 is a force-applying structure, and the working surface on the first working block 13 is a complex curved surface structure for fitting the transverse inner surface of the guide tube large end. The longitudinal straightening mold for the large end of the blade includes a second force transmission structure 21, a second screw assembly 22, and a second working block 23. The second screw assembly 22 is connected to the tail end of the second force transmission structure 21, and the tail end of the second working block 23 is connected to the front end of the second force transmission structure 21. The top of the second working block 23 is a straightening curved surface structure that fits the longitudinal inner surface of the large end of the guide tube. The longitudinal straightening mold for the large end of the blade adopts the lever expansion principle. The second screw assembly 22 at the tail end of the longitudinal straightening mold for the large end of the blade is a force-applying structure. The top of the longitudinal straightening mold for the large end of the blade is a complex curved surface structure that fits the longitudinal inner surface of the large end of the guide tube, which is the working surface. The transverse straightening mold for the small end of the blade includes a positioning base 31, a third screw assembly 32, and a wedge block 33. The positioning base 31 is connected to the blade, and the third screw assembly 32 passes through the positioning base 31 and is connected to the bottom end of the wedge block 33. The top of the wedge block 33 is a complex curved surface structure that fits the transverse contour of the small end of the guide tube, which is the working surface of the straightening mold. The transverse straightening mold for the small end of the blade adopts the wedge-shaped expansion and flanging principle, and the positioning base 31 is used to tighten the wedge block 33. The longitudinal straightening mold for the small end of the blade includes a fourth screw assembly 41, a fourth force transmission structure 42, a fourth working block 43, and a positioning block 44. The fourth screw assembly 41 is connected to the tail end of the fourth force transmission structure 42, and the tail end of the fourth working block 43 is connected to the front end of the fourth force transmission structure 42. The top of the fourth working block 43 is a straightening curved surface structure that fits the longitudinal inner surface of the small end of the guide tube; it is the working surface of the straightening mold. The positioning block 44 is connected to the blade. The blade is flat and cannot provide stable support for the fourth working block 43. The positioning block 44 provides an inclined surface to provide support for the fourth working block 43, so that the fourth working block 43 can effectively apply tension force to achieve the straightening purpose. The positioning block 44 is provided with a positioning surface and provides support for the clamping structure. The longitudinal straightening mold for the small end of the blade adopts the hinge clamping principle.

[0012] Preferably, the first force transmission structure 11 is a scissor-shaped force transmission structure.

[0013] Preferably, the second force transmission structure 21 is specifically an H-shaped force transmission structure.

[0014] Preferably, the fourth screw assembly 41 is specifically a hinge screw structure. The hinge screw structure is the force-applying structure of the forming mold. The method for controlling the assembly gap between the low-pressure turbine guide vane and the guide tube employs a device for controlling the assembly gap between the low-pressure turbine guide vane and the guide tube. The specific steps are as follows: Step 1: Select and install the appropriate guide tube into the blade cavity. The appropriate guide tube refers to the guide tubes from the same batch being tested and assembled with the blades from the same batch. The guide tubes with the smallest relative gap between them and the blades are selected as a group, which can reduce the workload of calibration. Step 2: Use the blade large end lateral straightening mold to laterally straighten the large end of the guide tube; Insert the top of the blade large-end lateral straightening mold into the large end of the guide tube. Apply force by tightening the first screw assembly 12 at the tail end of the blade large-end lateral straightening mold to open the top of the blade large-end lateral straightening mold and perform lateral straightening of the guide tube large end. After the gap between the guide tube and the blade meets the requirements, spot weld it in place. Loosen the first screw assembly 12 and remove the blade large-end lateral straightening mold to complete the lateral straightening of the blade large end. Step 3: Use the blade large end longitudinal straightening mold to longitudinally straighten the large end of the guide tube; Insert the top of the longitudinal alignment mold for the large end of the blade into the large end of the guide tube. Apply force by tightening the second screw assembly 22 at the tail end of the longitudinal alignment mold to open the top of the longitudinal alignment mold for the large end of the guide tube to perform longitudinal alignment. After the gap between the guide tube and the blade meets the requirements, spot weld it in place. Loosen the second screw assembly 22 and remove the longitudinal alignment mold for the large end of the blade to complete the longitudinal alignment of the large end of the blade. Step 4: Use the blade small end lateral straightening mold to laterally straighten the small end of the guide tube; Insert the wedge block at the top of the blade small end lateral straightening mold into the small end of the blade guide tube and pass through the guide tube. Install the wedge block 33 onto the positioning base 31 at the tail end of the blade small end lateral straightening mold at the large end of the guide tube. Tighten the screws on the positioning base 31 to tighten the top of the wedge block 33 and perform lateral straightening of the small end of the guide tube. After the gap between the guide tube and the blade meets the requirements, spot weld it in place. Remove the wedge block 33 from the positioning base 31 and take it out. This completes the lateral straightening of the blade small end. Step 5: Use the blade small end longitudinal shaping mold to longitudinally shape the small end of the guide tube; Insert the top of the longitudinal alignment mold for the small end of the blade into the small end of the guide tube. Apply force at the tail end of the fixture by tightening the fourth screw assembly 41 to close the top of the longitudinal alignment mold for the small end of the blade and perform longitudinal alignment of the small end of the guide tube. After the gap between the guide tube and the blade meets the requirements, spot weld to fix it. Loosen the fourth screw assembly 41 and take out the longitudinal alignment mold for the small end of the blade to complete the entire alignment process.

Claims

1. A device for controlling the assembly clearance between a low-pressure turbine guide vane and a guide pipe, characterized in that: The low-pressure turbine guide vane and guide tube assembly clearance control device includes: a blade large end transverse straightening mold, a blade large end longitudinal straightening mold, a blade small end transverse straightening mold, and a blade small end longitudinal straightening mold; the blade large end transverse straightening mold includes a first force transmission structure (11), a first screw assembly (12), and a first working block (13); the first screw assembly (12) is connected to the tail end of the first force transmission structure (11), the tail end of the first working block (13) is connected to the front end of the first force transmission structure (11), and the top end of the first working block (13) is a straightening working surface for fitting the transverse inner surface of the guide tube large end; the blade large end longitudinal straightening mold includes a second force transmission structure (21), a second screw assembly (22), and a second working block (23); the second screw assembly (22) is connected to the tail end of the second force transmission structure (21), the tail end of the second working block (23) is connected to the front end of the second force transmission structure (21), and the second working block (23) is connected to the front end of the second force transmission structure (21), and the second working block (23) is connected to the front end of the second force transmission structure (21), and the second working block (23) is connected to the tail ... tail end of the second force transmission structure ( The top of the working block (23) is a correction surface structure for fitting the longitudinal inner surface of the large end of the guide tube; the transverse correction mold for the small end of the blade includes a positioning base (31), a third screw assembly (32) and a wedge block (33); the positioning base (31) is connected to the blade, the third screw assembly (32) passes through the positioning base (31) and is connected to the bottom end of the wedge block (33), the top of the wedge block (33) is a curved surface structure for fitting the transverse contour of the small end of the guide tube; the longitudinal correction mold for the small end of the blade includes a fourth screw assembly (41), a fourth force transmission structure (42), a fourth working block (43) and a positioning block (44); the fourth screw assembly (41) is connected to the tail end of the fourth force transmission structure (42), the tail end of the fourth working block (43) is connected to the front end of the fourth force transmission structure (42), the top of the fourth working block (43) is a correction surface structure for fitting the longitudinal inner surface of the small end of the guide tube; the positioning block (44) is connected to the blade.

2. The low-pressure turbine guide vane and guide tube assembly clearance control device according to claim 1, characterized in that: The first force transmission structure (11) is specifically a shear-shaped force transmission structure.

3. The low-pressure turbine guide vane and guide tube assembly clearance control device according to claim 2, characterized in that: The second force transmission structure (21) is specifically an H-shaped force transmission structure.

4. The low-pressure turbine guide vane and guide pipe assembly clearance control device according to claim 3, characterized in that: The fourth screw assembly (41) is specifically a hinge screw structure.

5. A method for controlling the assembly clearance between a low-pressure turbine guide vane and a guide tube, characterized in that: The specific steps of using the low-pressure turbine guide vane and guide tube assembly clearance control device as described in claim 4 are as follows: Step 1: Select and install the appropriate guide tube into the blade cavity. The appropriate guide tube refers to the guide tubes from the same batch being tested and assembled with the blades from the same batch. The guide tubes with the smallest relative gap between them and the blades are selected as a group, which can reduce the workload of calibration. Step 2: Use the blade large end lateral straightening mold to laterally straighten the large end of the guide tube; Insert the top of the blade large end lateral straightening mold into the large end of the guide tube. Apply force at the tail end of the blade large end lateral straightening mold by tightening the first screw assembly (12). Open the top of the blade large end lateral straightening mold to perform lateral straightening of the guide tube. When the gap between the guide tube and the blade meets the requirements, spot weld and fix it. Loosen the first screw assembly (12) and take out the blade large end lateral straightening mold to complete the blade large end lateral straightening. Step 3: Use the blade large end longitudinal straightening mold to longitudinally straighten the large end of the guide tube; Insert the top of the longitudinal alignment mold of the blade large end into the large end of the guide tube. Apply force at the tail end of the longitudinal alignment mold of the blade large end by tightening the second screw assembly (22) to open the top of the longitudinal alignment mold of the blade large end for longitudinal alignment of the guide tube. When the gap between the guide tube and the blade meets the requirements, spot weld and fix it. Loosen the second screw assembly (22) and take out the longitudinal alignment mold of the blade large end to complete the longitudinal alignment of the blade large end. Step 4: Use the blade small end lateral straightening mold to laterally straighten the small end of the guide tube; Insert the wedge block at the top of the blade small end lateral straightening mold into the small end of the blade guide tube and pass through the guide tube. Install the wedge block (33) at the large end of the guide tube onto the positioning base (31) at the tail end of the blade small end lateral straightening mold. Tighten the screw on the positioning base (31) to tighten the top of the wedge block (33) and perform lateral straightening of the guide tube small end. When the gap between the guide tube and the blade meets the requirements, spot weld it to fix it. Remove the wedge block (33) from the positioning base (31) and take it out. The lateral straightening of the blade small end is completed. Step 5: Use the blade small end longitudinal shaping mold to longitudinally shape the small end of the guide tube; Insert the top of the blade end longitudinal alignment mold into the small end of the guide tube. Apply force at the tail end of the fixture by tightening the fourth screw assembly (41) to close the top of the blade end longitudinal alignment mold and perform longitudinal alignment of the small end of the guide tube. When the gap between the guide tube and the blade meets the requirements, spot weld and fix it. Loosen the fourth screw assembly (41) and take out the blade end longitudinal alignment mold to complete the entire alignment process.

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