A method for installing a centering ring of a gas turbine power turbine casing

Abstract

The present invention belongs to the technical field of gas turbines, and specifically relates to a method for installing a centering ring of a gas turbine power turbine casing, comprising the following steps: Step A: The guide blades are pressed and fixed by using a guide vane pressure plate tooling; Step B: All guide blades of the same stage are positioned and fixed; Step C: The annular positioning tooling is installed on the guide blades; Step D: All guide vane pressure plate tooling is disassembled, and the centering ring is installed on the casing ring segment. In this scheme, the guide vane pressure plate tooling can replace it to position and fix the guide blades one by one, thereby avoiding the problem that the inner edge of the guide blade shakes and damages the guide vane itself, the turbine blade or other parts; the annular positioning tooling can use the structure of the guide blade itself to position all guide blades of the same stage, so that after the guide vane pressure plate tooling is disassembled, the position of the guide blade can be maintained, thereby avoiding the damage to the parts of the power turbine caused by the unstable positioning of the guide blade.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbines, and in particular relates to a method for installing a centering ring of a power turbine casing of a gas turbine. Background Art

[0002] A gas turbine is a highly efficient power device that uses combustion of fuel gas as energy to generate high-temperature and high-pressure gas to drive the turbine to rotate, thereby achieving purposes such as power generation or propulsion.

[0003] The patent with publication number CN118855554A discloses a segmented power turbine casing of a gas turbine and an assembly method. The segmented power turbine casing includes casing ring segments, guide vanes and grate contact ring blocks; multiple casing ring segments are detachable; the lowermost casing ring segment is detachably connected to the supporting casing; multiple guide vanes are evenly distributed on the inner wall of each casing ring segment; a receiving cavity is preset on the front and lower sides of the guide vanes, and the receiving cavity is used to install turbine blades; the grate contact ring block is arranged on the outer side of the receiving cavity and is detachably connected to the casing ring segment, and the inner side wall of the grate contact ring block is used to perform grate sealing with the grate on the outer side of the turbine blade. The power turbine casing of this scheme does not need to disassemble and assemble the power turbine rotor that has been dynamically balanced during installation, and does not destroy the dynamic balance state of the power turbine rotor; this scheme adopts an axial segmented structure, which can install the casing ring segments and guide vanes step by step, and the weight of a single casing ring segment and guide vane is light, and the installation difficulty is low.

[0004] The weight of the guide blades of the power turbine casing is about 11 kilograms. Each stage of guide blades is composed of 18 individual guide blades arranged in a circle. Due to the structural limitations of the power turbine casing, during the general assembly process, the guide blades of each stage must be installed step by step from the back to the front without disassembling the power turbine rotor. Figure 1 Because each stage of guide blades consists of 18 guide blade units, they need to be installed one by one. After the installation of the first stage of guide blades is completed, the centering ring is installed to tighten the outer edges of all the guide blades of this stage.

[0005] However, this installation method has the following problems: since the guide vane itself is heavy and no casing ring segment is installed for support, during the installation of the centering ring, each guide vane may swing due to poor stability and high freedom of movement of the guide vane units. The inner edge of the guide vane is easily drooped due to gravity, resulting in unstable positioning, and may even damage the guide vane itself, turbine blades or other parts.

[0006] Therefore, it is necessary to design a centering ring installation method that avoids the above problems. Summary of the invention

[0007] In order to solve the above problems existing in the prior art, the present invention provides a method for installing a centering ring of a gas turbine power turbine casing.

[0008] The technical solution adopted by the present invention is:

[0009] A method for installing a centering ring of a gas turbine power turbine casing, wherein the power turbine casing comprises a casing ring segment, guide blades and a grate contact ring block;

[0010] An upper mounting fulcrum is arranged on the inner side of the upper end of the casing ring segment, and the upper mounting fulcrum, the upper end of the comb teeth contact ring block, the centering ring, and the lower end of the outer edge of the guide blade are engaged with each other; the cross section of the upper mounting fulcrum is in the shape of a letter Z extending inward and downward; the cross section of the centering ring is in the shape of a letter Z extending inward and upward; the upper end of the comb teeth contact ring block has a first U-shaped opening opening upward, and the lower end of the outer edge of the guide blade is provided with an L-shaped edge with an L-shaped cross section; the lower end of the upper mounting fulcrum is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring, and a clamping groove for clamping the L-shaped edge is formed between the upper mounting fulcrum, the comb teeth contact ring block, and the centering ring;

[0011] The centering ring installation method includes the following steps:

[0012] Step A: inserting the guide vanes between the adjacent guide vanes, and pressing and fixing the L-shaped edge of each guide vane with a guide vane pressing plate tooling;

[0013] The guide vane pressure plate fixture is an arc-shaped sheet structure, and the cross section of the guide vane pressure plate fixture is the same as the cross section of the centering ring; the guide vane pressure plate fixture is fixed to the casing ring segment by bolts; when the guide vane pressure plate fixture presses the guide vane, the lower end of the upper mounting fulcrum is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring, and the upper mounting fulcrum, the upper end of the comb tooth contact ring block, the guide vane pressure plate fixture, and the L-shaped edge of the guide vane are engaged with each other to realize the positioning and fixing of the guide vane;

[0014] Step B: Repeat step A to position and fix all guide vanes of the same stage, and the corresponding relationship between the guide vane pressing plate fixture and the guide vanes is one-to-one, one-to-two or one-to-three;

[0015] Step C: installing the annular positioning tool on the guide blade in step B; the upper end of the outer edge of the guide blade is provided with a third U-shaped opening opening upward; the annular positioning tool is a circular ring structure, and is matched and arranged in the third U-shaped opening to position and fix the upper ends of the outer edges of all the guide blades;

[0016] Step D: Disassemble all guide vane pressure plate fixtures, and install the centering ring on the casing ring segment, so that the centering ring replaces the guide vane pressure plate fixture to position and fix all guide vanes.

[0017] As an alternative or supplement to the above method: the multiple casing ring segments are all in a conical ring shape, and are coaxially connected in sequence along the axial direction of the power turbine casing, and adjacent casing ring segments are detachable; a plurality of guide blades are arranged on the inner wall of each casing ring segment, and the guide blades are detachably connected to the casing ring segment; the turbine blades of the power turbine are arranged between adjacent stage guide blades; the comb tooth contact ring block is in a circular ring shape and is arranged on the outside of the turbine blades; the comb tooth contact ring block is detachably connected to the casing ring segment, and the inner side wall of the comb tooth contact ring block is sealed with the comb teeth of the turbine blades.

[0018] As an alternative or supplement to the above method: after step D, the annular positioning fixture is disassembled, and another casing ring segment and another comb tooth contact ring block are installed on the outer side of the guide vane.

[0019] As an alternative or supplement to the above method: the third U-shaped opening adopts a closed-end structure.

[0020] As an alternative or supplement to the above method: the cross-section of the annular positioning tool is rectangular, the inner wall of the third U-shaped opening includes a first wall surface and a second wall surface, and the second wall surface is located radially outside the first wall surface; the outer ring surface of the annular positioning tool is against the second wall surface, and the inner ring surface of the annular positioning tool is against the first wall surface.

[0021] As an alternative or supplement to the above method: a convex ridge protruding radially outward is provided on the first wall surface; an annular groove is provided on the inner ring surface of the annular positioning tool; and the convex ridge and the groove are engaged with each other.

[0022] As an alternative or supplement to the above method: through holes are respectively provided at both ends of the guide vane pressure plate tooling, and bolts pass through the through holes to be fixedly connected to the casing ring segment.

[0023] As an alternative or supplement to the above method: a lower mounting fulcrum is provided on the inner side wall of the lower end of the casing ring segment; the lower mounting fulcrum, the lower end of the comb tooth contact ring block and the retaining ring are engaged with each other and are located in the third U-shaped opening of the guide vane.

[0024] As an alternative or supplement to the above method: the lower mounting support has a second U-shaped opening, the retaining ring has a notch, and the lower end of the comb tooth contact ring block has a clamping edge extending downward; the second U-shaped opening opens downward, and the inner wall of the second U-shaped opening and the clamping edge extend into the notch of the retaining ring together, and the retaining ring is pressed tightly into the second U-shaped opening.

[0025] The beneficial effects of the present invention are:

[0026] 1. The guide vane pressing plate tooling in this scheme can replace the centering ring to position and fix the guide vanes one by one before installing the centering ring, thereby avoiding the problem that the inner edge of the guide vane shakes and damages the guide vane itself, turbine blades or other parts;

[0027] 2. The annular positioning fixture in this scheme can utilize the structure of the guide vanes themselves to position all the guide vanes of the same stage, so that after the guide vane pressure plate fixture is disassembled, the position of the guide vanes can be maintained, avoiding damage to the components of the power turbine caused by unstable positioning of the guide vanes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0029] Figure 1 is a cross-sectional structural diagram of a power turbine casing of a gas turbine in this scheme;

[0030] Figure 2 This is the state diagram after the guide vane pressure plate tooling is installed;

[0031] Figure 3 It is a top view of the guide vane pressure plate tooling;

[0032] Figure 4 yes Figure 3 Middle SS cross-section structure diagram;

[0033] Figure 5 This is the state diagram after the annular positioning tooling is installed;

[0034] Figure 6 This is a diagram of the centering ring when it is installed.

[0035] In the figure: 1-guide vane; 2-casing ring segment; 3-centering ring; 4-turbine blade; 5-guide vane pressure plate tooling; 6-annular positioning tooling; 7-comb tooth contact ring block; 8-retaining ring. DETAILED DESCRIPTION

[0036] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0037] The directional words such as "upper", "lower", "inside" and "outside" in this scheme are based on the drawings as the reference system. When the orientation of the components in the drawings changes, the above-mentioned directional words should change accordingly. The directional words are not used to limit the absolute direction of the technical solution of this scheme.

[0038] like Figures 1 to 6 As shown, this embodiment designs a method for installing a centering ring of a gas turbine power turbine casing, wherein the power turbine casing includes a casing ring segment, guide vanes and a grate contact ring block.

[0039] The casing ring segment 2 is in a conical ring shape, and a plurality of casing ring segments 2 are coaxially connected in sequence from bottom to top along the axial direction of the power turbine casing, and adjacent casing ring segments 2 are detachable; for example: Figure 1 The number of the casing ring segments 2 in the casing is three. The bottom casing ring segment 2 is detachably connected to the supporting casing.

[0040] Fastening screws and embedded locating pins are provided at the connection between adjacent casing ring segments 2 and the connection between casing ring segments 2 and supporting casing. The locating pins are used for positioning when casing ring segments 2 are docked, thereby ensuring the alignment of power casing ring segments 2 during assembly. At the same time, the embedded locating pins are more suitable for installation scenarios with flanges of greater thickness.

[0041] Each casing ring segment 2 has a corresponding first-stage guide blade 1 on the inner side thereof, and each stage is a plurality of guide blades 1 arranged in a ring, and the guide blades 1 are detachably connected to the casing ring segment 2. When installing the segmented power turbine casing, each casing ring segment 2 and each stage of guide blades 1 are installed from bottom to top.

[0042] Each stage of guide blades 1 has a preset accommodation cavity on the upper and lower sides thereof, and the accommodation cavity is used to install turbine blades 4; each stage of guide blades 1 is correspondingly arranged between two adjacent stages of turbine blades 4. The turbine blades 4 of the power turbine are also arranged between adjacent stages of guide blades 1.

[0043] The grate contact ring block 7 is in a circular shape and is arranged outside the accommodating cavity. When in use, the grate contact ring block 7 is located outside the turbine blade 4. The grate contact ring block 7 is detachably connected to the casing ring segment 2, and the inner side wall of the grate contact ring block 7 is used to perform grate sealing with the grate on the outer side of the turbine blade 4. An airflow cavity can be formed between the grate contact ring block 7 and the inner wall of the casing ring segment 2. When air flows through the airflow cavity, the power turbine casing can be insulated and dissipated.

[0044] An upper mounting fulcrum is provided above each comb tooth contact ring block 7, the upper mounting fulcrum is fixed to the inner side of the upper end of the casing ring segment 2, and the upper side of the comb tooth contact ring block 7 is snap-connected with the upper mounting fulcrum. A lower mounting fulcrum is provided below each comb tooth contact ring block 7, the lower mounting fulcrum is relatively fixed to the inner ring side of the casing ring segment 2, and the lower side of the comb tooth contact ring block 7 is snap-connected with the lower mounting fulcrum. Some of the upper mounting fulcrum and the lower mounting fulcrum are integrally formed on the casing ring segment 2.

[0045] The upper mounting fulcrum, the upper end of the comb tooth contact ring block 7, the centering ring 3, and the lower end of the outer edge of the guide blade 1 are engaged with each other. Specifically: the cross section of the upper mounting fulcrum is a Z-shaped extending inward and downward, and the cross section of the centering ring 3 is a Z-shaped extending inward and upward; the upper end of the comb tooth contact ring block 7 has a first U-shaped opening that opens upward, and the lower end of the outer edge of the guide blade 1 is provided with an L-shaped edge with an L-shaped cross section. The lower end of the upper mounting fulcrum is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring 3. A clamping groove for clamping the L-shaped edge is formed between the upper mounting fulcrum, the comb tooth contact ring block 7, and the centering ring 3, and the L-shaped edge penetrates into the clamping groove to achieve an engaged connection. The function of the centering ring 3 is to clamp the guide blade 1 and center the guide blade 1, so that the ring center of the multiple guide blades 1 at each casing ring segment 2 is closer to the axis of the turbine rotor 13.

[0046] The lower mounting support, the lower end of the comb teeth contact ring block 7, the retaining ring 8, and the upper end of the outer edge of the guide blade 1 are engaged with each other. Specifically: the lower mounting support has a second U-shaped opening; the retaining ring 8 has a notch opening that opens upward, and the lower end of the comb teeth contact ring block 7 has a clamping edge extending downward. When the second U-shaped opening of the casing ring segment 2 opens downward, the inner wall of the second U-shaped opening and the clamping edge extend into the notch of the retaining ring 8 together, and the retaining ring 8 is pressed against the upper end notch of the corresponding guide blade 1, and the retaining ring 8 is interference fit with the lower mounting support and the comb teeth contact ring block 7.

[0047] The installation method of the centering ring 3 includes the following steps:

[0048] Step A: inserting the guide blade 1 between the guide blades 1 of adjacent stages, and pressing and fixing the L-shaped edge of each guide blade 1 by using the guide blade pressing plate tooling 5;

[0049] The guide vane pressure plate fixture 5 is an arc-shaped sheet structure, and the cross section of the guide vane pressure plate fixture 5 is the same as the cross section of the centering ring 3; the guide vane pressure plate fixture 5 is fixed to the casing ring segment 2 by bolts; when the guide vane pressure plate fixture 5 presses the guide vane 1, the lower end of the upper mounting fulcrum is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring 3, and the upper mounting fulcrum, the upper end of the comb tooth contact ring block 7, the guide vane pressure plate fixture 5, and the L-shaped edge of the guide vane 1 are engaged with each other to achieve the positioning and fixing of the guide vane 1. Through holes are respectively provided at both ends of the guide vane pressure plate fixture 5, and bolts are passed through the through holes to be fixedly connected to the casing ring segment 2.

[0050] Step B: repeating step A, positioning and fixing all guide blades 1 of the same stage, the corresponding relationship between the guide blade pressing plate fixture 5 and the guide blade 1 is one-to-one, one-to-two or one-to-three;

[0051] Step C: Install the annular positioning tool 6 onto the guide blade 1 in step B; a third U-shaped opening opening upward is provided at the upper end of the outer edge of the guide blade 1, and the third U-shaped opening can adopt a closed structure; the annular positioning tool 6 is a circular ring structure, and is matched and arranged in the third U-shaped opening to position and fix the upper end of the outer edge of all guide blades 1.

[0052] The cross section of the annular positioning fixture 6 is rectangular, and the inner wall of the third U-shaped opening includes a first wall surface and a second wall surface, and the second wall surface is located radially outside the first wall surface; the outer ring surface of the annular positioning fixture 6 abuts against the second wall surface, and the inner ring surface of the annular positioning fixture 6 abuts against the first wall surface. The first wall surface is provided with a convex ridge protruding radially outward; the inner ring surface of the annular positioning fixture 6 is provided with an annular concave pattern; the convex ridge and the concave pattern are engaged with each other. This improves the solidity of the annular positioning fixture 6 after being connected to the guide blade 1.

[0053] The second U-shaped opening is open downwards, and the inner wall and the clamping edge of the second U-shaped opening extend into the notch of the retaining ring 8 together, and the retaining ring 8 is pressed tightly into the second U-shaped opening.

[0054] Step D: disassemble all the guide vane pressure plate fixtures 5 and install the centering ring 3 on the casing ring segment 2 so that the centering ring 3 replaces the guide vane pressure plate fixtures 5 to position and fix all the guide vanes 1 .

[0055] After the above step D, the annular positioning fixture 6 is disassembled, and another casing ring segment 2 and another comb tooth contact ring block 7 are installed on the outer side of the guide vane 1 .

[0056] A lower mounting support is provided on the inner side wall of the lower end of the casing ring segment 2 ; the lower mounting support, the lower end of the comb tooth contact ring block 7 and the retaining ring 8 are engaged with each other and are located in the third U-shaped opening of the guide blade 1 .

[0057] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A method for installing a centering ring of a gas turbine power turbine casing, characterized in that: The power turbine casing comprises a casing ring segment (2), guide blades (1) and a comb tooth contact ring block (7); An upper mounting fulcrum is arranged on the inner side of the upper end of the casing ring segment (2); the upper mounting fulcrum, the upper end of the comb tooth contact ring block (7), the centering ring (3), and the lower end of the outer edge of the guide blade (1) are engaged with each other; the cross section of the upper mounting fulcrum is in the shape of a letter Z extending inwardly and downwardly; the cross section of the centering ring (3) is in the shape of a letter Z extending inwardly and upwardly; the upper end of the comb tooth contact ring block (7) has a first U-shaped opening opening upwardly, and the lower end of the outer edge of the guide blade (1) is provided with an L-shaped edge having an L-shaped cross section; the lower end of the upper mounting fulcrum is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring (3), and a clamping groove for clamping the L-shaped edge is formed between the upper mounting fulcrum, the comb tooth contact ring block (7), and the centering ring (3); The centering ring installation method includes the following steps: Step A: inserting the guide blade (1) between adjacent stages of guide blades (1), and pressing and fixing the L-shaped edge of each guide blade (1) using a guide blade pressing plate tooling (5); The guide vane pressure plate fixture (5) is an arc-shaped sheet structure, and the cross section of the guide vane pressure plate fixture (5) is the same as the cross section of the centering ring (3); the guide vane pressure plate fixture (5) is fixed to the casing ring segment (2) by bolts; when the guide vane pressure plate fixture (5) presses the guide vane (1), the lower end of the upper mounting support is inserted into the first U-shaped opening, and the upper end is fixedly connected to the centering ring (3), and the upper mounting support, the upper end of the comb tooth contact ring block (7), the guide vane pressure plate fixture (5), and the L-shaped edge of the guide vane (1) are engaged with each other to achieve positioning and fixing of the guide vane (1); Step B: repeating step A to position and fix all guide vanes (1) of the same stage, wherein the corresponding relationship between the guide vane pressing plate fixture (5) and the guide vanes (1) is one-to-one, one-to-two or one-to-three; Step C: installing the annular positioning fixture (6) onto the guide blade (1) in step B; a third U-shaped opening opening upward is provided at the upper end of the outer edge of the guide blade (1); the annular positioning fixture (6) is a circular ring structure and is matched and arranged in the third U-shaped opening to position and fix the upper ends of the outer edges of all the guide blades (1); Step D: disassemble all the guide vane pressure plate fixtures (5), and install the centering ring (3) on the casing ring segment (2), so that the centering ring (3) replaces the guide vane pressure plate fixture (5) to position and fix all the guide vanes (1).

2. The method for installing a centering ring of a gas turbine power turbine casing according to claim 1, characterized in that: The plurality of casing ring segments (2) are all in the shape of a cone ring and are coaxially connected in sequence along the axial direction of the power turbine casing, and adjacent casing ring segments (2) are detachable; a plurality of guide blades (1) are arranged on the inner wall of each casing ring segment (2), and the guide blades (1) are detachably connected to the casing ring segment (2); turbine blades (4) of the power turbine are arranged between adjacent stages of guide blades (1); the grate contact ring block (7) is in the shape of a circular ring and is arranged on the outer side of the turbine blade (4); the grate contact ring block (7) is detachably connected to the casing ring segment (2), and the inner side wall of the grate contact ring block (7) is grate-sealed with the turbine blade (4).

3. The method for installing a centering ring of a gas turbine power turbine casing according to claim 2, characterized in that: After step D, the annular positioning fixture (6) is disassembled, and another casing ring segment (2) and another comb tooth contact ring block (7) are installed on the outer side of the guide vane (1).

4. The method for installing a centering ring of a gas turbine power turbine casing according to claim 2, characterized in that: The third U-shaped opening adopts a closed-end structure.

5. The method for installing a centering ring of a gas turbine power turbine casing according to claim 4, characterized in that: The cross-section of the annular positioning fixture (6) is rectangular, and the inner wall of the third U-shaped opening comprises a first wall surface and a second wall surface, the second wall surface being located radially outside the first wall surface; the outer annular surface of the annular positioning fixture (6) abuts against the second wall surface, and the inner annular surface of the annular positioning fixture (6) abuts against the first wall surface.

6. The method for installing a centering ring of a gas turbine power turbine casing according to claim 5, characterized in that: The first wall surface is provided with a convex ridge protruding radially outward; the inner ring surface of the annular positioning tool (6) is provided with an annular concave pattern; the convex ridge and the concave pattern are engaged with each other.

7. The method for installing a centering ring of a gas turbine power turbine casing according to any one of claims 1 to 6, characterized in that: Through holes are respectively provided at both ends of the guide vane pressure plate tooling (5), and bolts pass through the through holes to be fixedly connected to the casing ring segment (2).

8. The method for installing a centering ring of a gas turbine power turbine casing according to any one of claims 1 to 5, characterized in that: A lower mounting support is provided on the inner side wall of the lower end of the casing ring segment (2); the lower mounting support, the lower end of the comb tooth contact ring block (7) and the retaining ring (8) are engaged with each other and are located in the third U-shaped opening of the guide blade (1).

9. The method for installing a centering ring of a gas turbine power turbine casing according to claim 8, characterized in that: The lower mounting support point has a second U-shaped opening, the retaining ring (8) has a notch, and the lower end of the comb tooth contact ring block (7) has a clamping edge extending downward; the second U-shaped opening opens downward, and the inner wall of the second U-shaped opening and the clamping edge jointly extend into the notch of the retaining ring (8), and the retaining ring (8) is pressed tightly into the second U-shaped opening.

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