A kind of outside assembly welding tool for sealing behind transition section of combustion engine

Abstract

A kind of welding tool for the outside assembly of combustion engine transition section rear seal, it relates to combustion engine transition section rear seal welding technical field, the utility model discloses in order to solve the problem that the existing welding procedure is when welding special-shaped thin plate and fiber metal strip, it is easy to cause the severe deformation of workpiece, cannot satisfy product drawing and assembly requirement, including positioning base plate, clamping seat, compression bolt, arc pressing plate, side positioning device, special-shaped thin plate and fiber metal strip;The upper end surface of positioning base plate is fixed with clamping seat, a plurality of compression bolts passing through clamping seat are threadedly connected on clamping seat, the lower end of compression bolt is provided with arc pressing plate, and the front end of positioning base plate is detachably installed with side positioning device;Special-shaped thin plate is overall arc-shaped, and special-shaped thin plate includes straight part and vertical bending part, the front end of positioning base plate is provided with arc surface, and the vertical bending part is closely attached to the arc surface of the front end of positioning base plate, the utility model is used for welding special-shaped thin plate and fiber metal strip.

Description

Technical Field

[0001] This utility model relates to the field of welding technology for the rear seal of the transition section of a gas turbine, and in particular to a welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine. Background Technology

[0002] The transition section of the gas turbine is a critical connecting component between the combustion chamber and the turbine. It is used to uniformly guide the high-temperature, high-pressure gas from the combustion chamber outlet into the first-stage turbine stator blades, ensuring that the airflow angle and pressure distribution meet turbine design requirements. The front and rear sealing systems of the transition section act as aerodynamic-mechanical barriers between the combustion chamber and the turbine module. The front seal is installed at the combustion chamber outlet to establish a pressure boundary, preventing high-temperature gas leakage into undesigned paths and ensuring 100% gas entry into the transition section flow channel. The rear seal is located at the junction of the transition section and the turbine stator blades, preventing reverse gas leakage into the turbine disk cavity. The rear seal of the transition section is constructed by welding two stacked 0.75 mm irregularly shaped thin plates.

[0003] Before assembly, 1.5 mm thick fiber metal strips need to be welded onto the irregularly shaped thin plate. Because both the irregularly shaped thin plate and the fiber metal strips are thin-walled parts, welding is difficult. Existing clamping tools easily cause severe workpiece deformation during the welding process, failing to meet the product drawings and assembly requirements. Utility Model Content

[0004] In order to solve the problem that existing welding processes easily cause severe workpiece deformation when welding irregularly shaped thin plates and fiber metal strips, making it impossible to meet product drawings and assembly requirements, this utility model provides a welding fixture for assembling the outer side of the rear seal of the gas turbine transition section, thereby solving the problems mentioned in the background art.

[0005] The technical solution of this utility model is:

[0006] A welding fixture for assembling the outer side of the rear seal of a gas turbine transition section includes a positioning base plate, a clamping seat, a clamping bolt, an arc-shaped pressure plate, a side positioning device, a shaped thin plate, and a fiber metal strip;

[0007] A clamping seat is fixed on the upper end of the positioning base plate. Several clamping bolts are threaded onto the clamping seat and pass through the clamping seat. An arc-shaped pressure plate is provided at the lower end of the clamping bolts. A side positioning device is detachably installed at the front end of the positioning base plate.

[0008] The irregularly shaped thin plate is arc-shaped in general. The irregularly shaped thin plate includes a straight part and a vertically bent part. The front end of the positioning base plate is provided with an arc surface. The vertically bent part is closely attached to the arc surface of the front end of the positioning base plate. The fiber metal strip is stacked on the straight part. The fiber metal strip and the straight part are clamped between the arc-shaped pressure plate and the positioning base plate. The side positioning device abuts against the front end face of the fiber metal strip.

[0009] Furthermore, the side positioning device is a side positioning pressure plate installed at the front end of the positioning base plate. The side positioning pressure plate is arc-shaped, and a plurality of first positioning teeth are provided at the upper end of the side positioning pressure plate. The first positioning teeth abut against the front end face of the fiber metal strip.

[0010] Furthermore, the first positioning tooth is provided with 3-6 teeth.

[0011] Furthermore, the side positioning device consists of several side positioning blocks installed at the front end of the positioning base plate. The side positioning blocks are provided with second positioning teeth, which abut against the front end face of the fiber metal strip.

[0012] Furthermore, the side positioning pressure block is provided in 3-6 units.

[0013] Furthermore, the clamping bolts are provided in 8-13 pieces.

[0014] Furthermore, the arc diameter of the front arc surface of the positioning base plate and the arc diameter of the arc-shaped pressure plate are 1300-1350mm.

[0015] Furthermore, the arc surface at the front end of the positioning base plate and the arc of the arc-shaped pressure plate form an angle of 20-28°.

[0016] Furthermore, the side positioning plate is detachably fixed to the front end of the positioning base plate by 4-7 first hex socket screws.

[0017] Furthermore, the side positioning block is detachably fixed to the front end of the positioning base plate by a second internal hex screw.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. A welding fixture for assembling the outer side of the rear seal of a gas turbine transition section. This utility model is used to fix fiber metal strips onto an irregularly shaped thin plate, facilitating welding between the fiber metal strips and the irregularly shaped thin plate. The irregularly shaped thin plate and fiber metal strip, stacked vertically, are placed between an arc-shaped pressure plate and a positioning base plate. Tightening the clamping bolts presses down on the arc-shaped pressure plate, clamping the irregularly shaped thin plate and fiber metal strip. By setting the positioning base plate and the arc-shaped pressure plate, surface contact is achieved between the fixture and the irregularly shaped thin plate and fiber metal strip, increasing the contact area between the fixture and the workpiece. This prevents deformation of the irregularly shaped thin plate and fiber metal strip due to heat or stress concentration during welding, ensuring the assembly accuracy of the workpiece after welding.

[0020] 2. A side positioning device is provided for positioning the fiber metal strip. The side positioning device has two implementation methods: a side positioning plate and a side positioning block. The side positioning plate is a long, strip-shaped structure suitable for positioning wider fiber metal strips. The side positioning plate has multiple first positioning teeth. During installation, the arc-shaped front end of the fiber metal strip is pressed against the first positioning teeth to ensure accurate positioning. The side positioning block is a modular positioning device; its number can be adjusted according to the length of the fiber metal strip to position fiber metal strips of different lengths. The side positioning block has second positioning teeth. The arc-shaped front end of the fiber metal strip is pressed against the second positioning teeth to ensure accurate positioning, completing the clamping and positioning of the fiber metal strip.

[0021] 3. The front end of the positioning base plate is provided with an arc surface, which is used to position the irregular thin plate. During clamping, the vertical bending part of the irregular thin plate is pressed tightly against the arc surface at the front end of the positioning base plate to complete the positioning of the irregular thin plate and ensure that the relative position of the irregular thin plate and the fiber metal strip is accurate during welding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention after the irregularly shaped thin plate and the fiber metal strip are clamped together;

[0023] Figure 2 for Figure 1 Longitudinal cross-section;

[0024] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the clamping seat and the arc-shaped pressure plate.

[0026] Figure 5 This is a schematic diagram of the structure of an irregularly shaped thin plate and fiber metal strips;

[0027] Figure 6 for Figure 5 Longitudinal cross-section;

[0028] Figure 7 A schematic diagram showing the positional relationship between the side positioning pressure plate and the fiber metal strip;

[0029] Figure 8 This is a structural schematic diagram of the side positioning pressure plate;

[0030] Figure 9 This is a schematic diagram of the structure of the second embodiment of the present invention after the irregularly shaped thin plate and the fiber metal strip are clamped together;

[0031] Figure 10 for Figure 9 Longitudinal cross-section;

[0032] Figure 11 A schematic diagram showing the positional relationship between the side positioning pressure block and the fiber metal strip;

[0033] Figure 12 This is a schematic diagram of the side positioning pressure block.

[0034] In the diagram: 1. Positioning base plate; 2. Clamping seat; 3. Clamping bolt; 4. Arc-shaped pressure plate; 5. Side positioning device; 501. Side positioning pressure plate; 502. First positioning tooth; 503. Side positioning pressure block; 504. Second positioning tooth; 6. Irregularly shaped thin plate; 601. Straight part; 602. Vertical bending part; 7. Fiber metal strip; 8. First internal hexagon screw; 9. Second internal hexagon screw. Detailed Implementation

[0035] Specific implementation method one: See Figure 1-6 As shown, a welding fixture for assembling the outer side of the rear seal of a gas turbine transition section is provided in this embodiment. It includes a positioning base plate 1, a clamping seat 2, a clamping bolt 3, an arc-shaped pressure plate 4, a side positioning device 5, a shaped thin plate 6, and a fiber metal strip 7.

[0036] A clamping seat 2 is fixed on the upper end face of the positioning base plate 1. Several clamping bolts 3 are threaded onto the clamping seat 2 and pass through the clamping seat 2. An arc-shaped pressure plate 4 is provided at the lower end of the clamping bolts 3. A side positioning device 5 is detachably installed at the front end of the positioning base plate 1.

[0037] The irregularly shaped thin plate 6 is arc-shaped in general. The irregularly shaped thin plate 6 includes a straight part 601 and a vertically bent part 602. The front end of the positioning base plate 1 is provided with an arc surface. The vertically bent part 602 is closely attached to the arc surface of the front end of the positioning base plate 1. The fiber metal strip 7 is stacked on the straight part 601. The fiber metal strip 7 and the straight part 601 are clamped between the arc-shaped pressure plate 4 and the positioning base plate 1. The side positioning device 5 abuts against the front end surface of the fiber metal strip 7.

[0038] Furthermore, the positioning base plate 1 and clamping seat 2 are fixedly connected by bolts. Both the arc-shaped pressure plate 4 and the positioning base plate 1 are long plate-shaped arc structures, designed to increase the contact area. The irregularly shaped thin plate 6 has an overall arc-shaped structure, divided into a straight part 601 and a vertically bent part 602. Before assembling the irregularly shaped thin plate 6, the fiber metal strip 7 needs to be welded to the straight part 601 of the irregularly shaped thin plate 6. The arc surface at the front end of the positioning base plate 1 and the arc of the arc-shaped pressure plate 4 are the same as the arc of the irregularly shaped thin plate 6 and the fiber metal strip 7. The arc surface is used to position the irregularly shaped thin plate 6. During clamping, the vertically bent part 602 of the irregularly shaped thin plate 6 is pressed tightly against the arc surface at the front end of the positioning base plate 1 to ensure accurate relative positioning of the irregularly shaped thin plate 6 and the fiber metal strip 7 during welding. The clamping seat 2 is an inverted L-shaped structure, and the space formed between it and the positioning base plate 1 is used to place the irregularly shaped thin plate 6. The upper end face of the positioning base plate 1 and the lower end face of the arc-shaped pressure plate 4 are the two clamping surfaces of the fixture. During welding, the stacked irregular thin plates 6 and fiber metal strips 7 are placed between the arc-shaped pressure plate 4 and the positioning base plate 1, and the clamping bolts 3 are tightened. The clamping bolts 3 press down on the arc-shaped pressure plate 4 to clamp the irregular thin plates 6 and fiber metal strips 7. By setting the positioning base plate 1 and the arc-shaped pressure plate 4, the fixture and the irregular thin plates 6 and fiber metal strips 7 are in surface contact, which increases the contact area between the fixture and the workpiece, and avoids deformation of the irregular thin plates 6 and fiber metal strips 7 due to heat or stress concentration during welding. This ensures the assembly accuracy of the workpiece after welding. The side positioning device 5 is used to position the fiber metal strips 7 and to clamp the vertically bent part 602.

[0039] Specific Implementation Method Two: See Figure 7-8 As shown, the side positioning device 5 in this embodiment is a side positioning pressure plate 501 installed at the front end of the positioning base plate 1. The side positioning pressure plate 501 is arc-shaped, and a plurality of first positioning teeth 502 are provided at the upper end of the side positioning pressure plate 501. The first positioning teeth 502 abut against the front end face of the fiber metal strip 7.

[0040] Specific implementation method three: See Figure 7-8 As shown, the first positioning tooth 502 in this embodiment is provided with 3-6 teeth.

[0041] Furthermore, this embodiment is a first embodiment of the side positioning device 5. The side positioning pressure plate 501 is an arc-shaped long strip structure, suitable for positioning relatively wide fiber metal strips 7. The contact surface between the first positioning teeth 502 and the fiber metal strip 7 is the contact end face. The contact end faces of multiple first positioning teeth 502 are on the same arc surface, and the curvature of the arc surface is the same as the curvature of the fiber metal strip 7. Setting 3-6 first positioning teeth 502 achieves a multi-point positioning effect for the fiber metal strip 7. During installation, the arc-shaped front end face of the fiber metal strip 7 is pressed against the first positioning teeth 502 to ensure accurate positioning of the fiber metal strip 7. The clamping and positioning of the fiber metal strip 7 is completed.

[0042] Detailed Implementation Method Four: See [link] Figure 9-12 As shown, the side positioning device 5 in this embodiment consists of several side positioning blocks 503 installed at the front end of the positioning base plate 1. The side positioning blocks 503 are provided with second positioning teeth 504, which abut against the front end face of the fiber metal strip 7.

[0043] Specific implementation method five: See Figure 9-12 As shown, the side positioning pressure block 503 in this embodiment is provided with 3-6 blocks.

[0044] Furthermore, this embodiment is a second embodiment of the side positioning device 5. The side positioning blocks 503 are modular positioning devices, and their number can be adjusted according to the length of the fiber metal strip 7 to achieve positioning of fiber metal strips 7 of different lengths. The contact end faces of the second positioning teeth 504 on multiple side positioning blocks 503 are on the same arc surface, and the curvature of the arc surface is the same as the curvature of the fiber metal strip 7. By setting 3-6 side positioning blocks 503, a multi-point positioning effect for the fiber metal strip 7 can be achieved. During clamping, the arc-shaped front end face of the fiber metal strip 7 is pressed against the second positioning teeth 504 to ensure the accurate positioning of the fiber metal strip 7, thus completing the clamping and positioning of the fiber metal strip 7.

[0045] Specific implementation method six: See Figure 4 As shown, the clamping bolts 3 in this embodiment are provided with 8-13 bolts.

[0046] Furthermore, since the irregularly shaped thin plate 6 and the fiber metal strip 7 are long, thin-walled structures, 8-13 clamping bolts 3 are used to apply downward pressure to the arc-shaped pressure plate 4 to ensure uniform force distribution during clamping. As an alternative implementation, the arc-shaped pressure plate 4 is divided into three sections, with all three sections covering the fiber metal strip 7. Each arc-shaped pressure plate 4 is subjected to downward pressure by 3-4 clamping bolts 3. This allows each arc-shaped pressure plate 4 to be pressed down independently, enabling the clamping of irregularly shaped thin plates 6 and fiber metal strips 7 of different lengths, thus making operation more convenient.

[0047] Detailed implementation method seven: See Figure 5-6 As shown, the arc diameter of the front end of the positioning base plate 1 and the arc diameter of the arc-shaped pressure plate 4 in this embodiment are 1300-1350mm.

[0048] Detailed Implementation Method Eight: See also Figure 5-6 As shown, in this embodiment, the arc surface of the front end of the positioning base plate 1 and the arc of the arc-shaped pressure plate 4 are at a ratio of 20-28°.

[0049] Furthermore, the diameter of the arc surface on the positioning base plate 1 and the arc-shaped pressure plate 4 are the same as the arc diameter and arc angle of the irregular thin plate 6 and the arc-shaped pressure plate 4, with an arc diameter of 1300-1350mm and an arc angle of 20-28°.

[0050] Detailed implementation method nine: See Figure 7-9 As shown, in this embodiment, the side positioning plate 501 is detachably fixed to the front end of the positioning base plate 1 by 4-7 first hex socket screws 8.

[0051] Detailed Implementation Method Ten: See [link / details] Figure 11 As shown, the side positioning block 503 in this embodiment is detachably fixed to the front end of the positioning base plate 1 by the second internal hex screw 9.

[0052] In use, the positioning base plate 1 and clamping seat 2 are fixed with bolts. The irregularly shaped thin plate 6 is placed on the positioning base plate 1, and the vertical bending part 602 is pressed tightly against the arc surface on the positioning base plate 1. The fiber metal strip 7 is stacked on the upper end of the straight part 601. The side positioning pressure plate 501 is fixed so that the side positioning pressure plate 501 presses against the vertical bending part 602. At the same time, the first positioning tooth 502 on the side positioning pressure plate 501 abuts against the front end face of the fiber metal strip 7, completing the positioning of the fiber metal strip 7. Then, an arc-shaped pressure plate 4 is placed between the fiber metal strip 7 and the clamping bolt 3. Finally, the clamping bolt 3 is tightened to complete the fixing of the irregularly shaped thin plate 6 and the fiber metal strip 7, and then the welding process is performed. The side positioning pressure block 503 is used in the same way.

[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 utility model.

Claims

1. A welding fixture for assembling the outer side of the rear seal of a gas turbine transition section, comprising a positioning base plate (1), a clamping seat (2), and a clamping bolt (3), characterized in that: It also includes an arc-shaped pressure plate (4), a side positioning device (5), an irregularly shaped thin plate (6), and a fiber metal strip (7). A clamping seat (2) is fixed on the upper end of the positioning base plate (1). Several clamping bolts (3) passing through the clamping seat (2) are threaded on the clamping seat (2). An arc-shaped pressure plate (4) is provided at the lower end of the clamping bolts (3). A side positioning device (5) is detachably installed on the front end of the positioning base plate (1). The irregular thin plate (6) is arc-shaped in general. The irregular thin plate (6) includes a straight part (601) and a vertical bending part (602). The front end of the positioning base plate (1) is provided with an arc surface. The vertical bending part (602) is close to the arc surface of the front end of the positioning base plate (1). The fiber metal strip (7) is stacked on the straight part (601). The fiber metal strip (7) and the straight part (601) are clamped between the arc-shaped pressure plate (4) and the positioning base plate (1). The side positioning device (5) abuts against the front end surface of the fiber metal strip (7).

2. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 1, characterized in that: The side positioning device (5) is a side positioning pressure plate (501) installed at the front end of the positioning base plate (1). The side positioning pressure plate (501) is arc-shaped, and the upper end of the side positioning pressure plate (501) is provided with a plurality of first positioning teeth (502). The first positioning teeth (502) abut against the front end face of the fiber metal strip (7).

3. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 2, characterized in that: The first positioning tooth (502) has 3-6 teeth.

4. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 1, characterized in that: The side positioning device (5) consists of several side positioning blocks (503) installed at the front end of the positioning base plate (1). The side positioning blocks (503) are provided with second positioning teeth (504), which abut against the front end face of the fiber metal strip (7).

5. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 4, characterized in that: The side positioning pressure block (503) is provided in 3-6 units.

6. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 1, characterized in that: The clamping bolts (3) are provided in 8-13 pieces.

7. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 1, characterized in that: The arc diameter of the front end of the positioning base plate (1) and the arc diameter of the arc plate (4) are 1300-1350mm.

8. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 7, characterized in that: The arc surface of the front end of the positioning base plate (1) and the arc of the arc-shaped pressure plate (4) are 20-28° apart.

9. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 2, characterized in that: The side positioning plate (501) is detachably fixed to the front end of the positioning base plate (1) by 4-7 first internal hex screws (8).

10. The welding fixture for assembling the outer side of the rear seal of the transition section of a gas turbine according to claim 4, characterized in that: The side positioning block (503) is detachably fixed to the front end of the positioning base plate (1) by a second internal hex screw (9).

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