Self-locking steam turbine air seal

Abstract

The utility model discloses a self-locking steam turbine air seal, relates to the technical field of steam turbine air seals, and aims to solve the problems that air seal teeth of an existing steam turbine shaft end air seal are not linearly inserted into T-shaped grooves of an air seal body in the mounting process, and the air seal teeth are deformed and damaged by tangential component force generated in the process of knocking the air seal teeth; the air seal comprises an air seal body, a T-shaped groove is formed in the air seal body, and the T-shaped groove is composed of a transverse part and a vertical part 202; the multi-section plug-in type air seal device is detachably plugged in the T-shaped groove to form a ring-shaped air seal; each section of plug-in type air sealing device comprises a throat neck, static air sealing teeth and a movable insertion tongue mechanism, the throat neck is plugged in the vertical part 202 of the T-shaped groove, the static air sealing teeth are arranged at the lower end of the throat neck, and the static air sealing teeth are matched with the movable air sealing teeth on the rotor.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine air seal technical field, especially a steam turbine air seal of self -locking. BACKGROUND

[0002] Steam turbine is the external combustion rotary machine that can convert steam heat energy into mechanical work. After the steam from the boiler enters the steam cylinder, it successively passes through the nozzle and the moving blade, and converts the heat energy of the steam into the mechanical energy of the rotation of the steam turbine rotor. In order to reduce steam leakage and prevent air leakage, steam turbine needs sealing device, commonly known as air seal. According to the different installation positions, air seal can be divided into through-flow part air seal, partition plate air seal and shaft end air seal.

[0003] Steam turbine shaft end air seal is a sealing device arranged at the steam turbine rotor passing through the cylinder, which is used for solving the gap sealing problem between the rotating rotor and the stationary cylinder. The core is a labyrinth structure, and multiple annular metal teeth are fixed on the holding ring at the end of the cylinder, forming a 0.2-0.5mm small gap with the rotor shaft sleeve, which constitutes a tortuous steam passage. Steam flows through the gap between the teeth and generates a throttling effect, and the pressure and temperature drop sharply. After entering the expansion chamber, the volume changes suddenly to form a strong vortex, most of the kinetic energy is converted into heat energy and absorbed, and the residual energy is repeatedly consumed through multiple stages, so that the pressure is gradually reduced, and finally the leakage is effectively controlled.

[0004] Because steam turbine will produce axial vibration when starting and stopping, the shaft end air seal collides and rubs with the steam turbine shaft, causing air seal wear, and the air seal needs to be repaired and replaced regularly. The existing steam turbine shaft end air seal is usually a semicircular structure, and when replacing the air seal, the air seal needs to be pulled out from the T-shaped slot of the air seal body in a rotating manner, and when installing, the new air seal tooth needs to be inserted into the T-shaped slot of the air seal body. In the process of inserting into the T-shaped slot, the staff needs to align the throat neck of the air seal tooth with the end of the T-shaped slot of the air seal body, and slide the air seal tooth into the T-shaped slot along the circumference. If resistance is encountered during the insertion of the air seal tooth, the air seal tooth needs to be knocked several times until the air seal tooth is aligned with the edge of the T-shaped slot of the air seal body, and finally fixed with bolts. The whole process requires higher requirements for the staff. Because the air seal tooth is not inserted along a straight line during installation, the tangential component force generated during the knocking of the air seal tooth will cause the air seal tooth to deform and damage, resulting in a very cumbersome replacement process. UTILITY MODEL CONTENTS

[0005] The utility model discloses a steam turbine air seal that can be self-locked to solve the problem in the background art.

[0006] The technical scheme of the utility model discloses

[0007] A self-locking steam turbine gas seal, comprising a gas seal body, a T-shaped slot is formed in the gas seal body, and the T-shaped slot comprises a horizontal portion and a vertical portion;

[0008] Further comprising a multi-section plug-in type gas seal device, which is detachably plugged into the T-shaped slot to form a circular ring-shaped gas seal.

[0009] Each plug-in type gas seal device comprises a throat neck, a static gas seal tooth and a movable plug mechanism, the throat neck is plugged into the vertical portion of the T-shaped slot, the lower end of the throat neck is provided with the static gas seal tooth, the static gas seal tooth is matched with a movable gas seal tooth on a rotor, and the throat neck is provided with the movable plug mechanism which is telescopically slidably plugged into the horizontal portion of the T-shaped slot.

[0010] Further, the movable plug mechanism comprises an even number of synchronous extension assemblies and a linkage mechanism; the even number of synchronous extension assemblies are respectively located on the left and right sides of the linkage mechanism in a symmetrical manner and are simultaneously extended out of the throat neck and clamped on the horizontal portion under the drive of the linkage mechanism.

[0011] Further, each synchronous extension assembly comprises a first sliding block and a second sliding block.

[0012] The first sliding block and the second sliding block are oppositely arranged in the width direction of the throat neck, the left end face of the first sliding block and the right end face of the second sliding block are provided with plugs which can be extended out of the throat neck, and the plugs can be plugged into the horizontal portion of the T-shaped slot.

[0013] Further, the linkage mechanism comprises a third sliding block, a sliding rod and a bolt.

[0014] The third sliding block is slidably installed in the throat neck in the vertical direction, and the left and right sides of the middle part of the third sliding block are respectively provided with a sliding rod.

[0015] The first sliding inclined slot is formed from the lower left to the upper right of the first sliding block, and the second sliding inclined slot is formed from the upper left to the lower right of the second sliding block.

[0016] The sliding rod is simultaneously arranged in the first sliding inclined slot and the second sliding inclined slot, and in the initial state, the sliding rod is located at the bottom of the first sliding inclined slot and the second sliding inclined slot.

[0017] After the bolt is sequentially slid upward through the third sliding block and the throat neck, only the upper part of the bolt is threadedly connected with the gas seal body, the sliding rod and the third sliding block are vertically displaced according to the screwing degree between the bolt and the gas seal body, the sliding rod generates an extension and retraction movement trend on the plug through extruding the inner side walls of the first sliding inclined slot and the second sliding inclined slot, and the plug-in type gas seal device is disassembled from the T-shaped slot.

[0018] Further, the plug is in a flat strip structure and is attached to the lower end face of the horizontal portion of the T-shaped slot.

[0019] Further, the first sliding chute and the second sliding chute are long strip-shaped holes.

[0020] Further, the bolt head of the bolt is embedded in the lower part of the third slider, the bolt and the mating surface of the third slider are in shaft hole cooperation, and the middle part to the upper part of the bolt is provided with external threads.

[0021] Further, the linkage mechanism further comprises a reset spring, the reset spring is sleeved on the bolt between the third slider and the throat neck, when the upper part of the bolt is unscrewed from the gas seal body, the reset spring releases the pre-tightening force and provides a downward force for the third slider, so that the sliding rod drives the plugs on the first slider and the second slider to be retracted in the horizontal part of the T-shaped slot.

[0022] Further, the throat neck is provided with a second sliding groove, and the third slider is slidingly connected in the second sliding groove.

[0023] A plurality of first sliding grooves are symmetrically arranged on the left and right sides of the second sliding groove, and one synchronous extension assembly is slidingly arranged in each first sliding groove.

[0024] Further, the static gas seal teeth are inclined to the air inlet side and are circular arc-shaped, and the thickness gradually decreases.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The movable plug mechanism is arranged in the gas seal throat neck, the movable plug mechanism can be retracted into the throat neck when the gas seal is disassembled, and the movable plug mechanism can be inserted into the T-shaped slot when the gas seal is installed, so that convenient installation and fixation are realized. The movable plug mechanism comprises: the first slider and the second slider provided with the plug, the third slider for driving the first slider and the second slider to move synchronously, the bolt for driving the third slider to move upward, and the reset spring for driving the third slider to reset downward. When the plug-in type gas seal device is fixed, the bolt is screwed into the gas seal body, the bolt drives the third slider to move upward along with the gradual upward movement of the bolt, the sliding rod on the third slider drives the first slider and the second slider to move to the left and right sides respectively, so that the plug is inserted into the horizontal part of the T-shaped slot, and the locking of the gas seal is completed. When the plug-in type gas seal device is disassembled, the reset spring drives the third slider to move downward, the sliding rod on the third slider drives the plug on the first slider and the second slider to retract into the throat neck, and the unlocking of the gas seal is completed.

[0027] 2. The static gas seal teeth are inclined to the air inlet side and are circular arc-shaped, and the thickness gradually decreases, so that the sealing effect of the gas seal is improved. The static gas seal teeth and the dynamic gas seal teeth are arranged as inclined arc surfaces on the air inlet side, so that the gap between the rotor and the static gas seal teeth or the gap between the gas seal body and the dynamic gas seal teeth forms a gas vortex opposite to the steam inlet direction. The gas vortex collides with the steam, so that the flow at the gap is turbulent, the flow rate at the gap is slowed down, and the sealing effect is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic view of the utility model;

[0029] Figure 2 It is a side view of the utility model;

[0030] Figure 3 It is an explosion view of the utility model;

[0031] Figure 4 It is a structural schematic view of the plug-in type air seal device plug tongue extension state;

[0032] Figure 5 It is a structural schematic view of the plug-in type air seal device plug tongue retraction state;

[0033] Figure 6 It is an explosion view of the plug-in type air seal device;

[0034] Figure 7 It is an assembly view of the first slider and the second slider;

[0035] Figure 8 It is a longitudinal section view of the plug-in type air seal device;

[0036] Figure 9 It is a longitudinal section view of the throat neck.

[0037] In the figure: 1, air seal body; 201, horizontal part; 202, vertical part; 2, T-shaped groove; 3, throat neck; 4, static air seal tooth; 401, circular arc surface; 501, first slider; 502, second slider; 503, plug tongue; 504, third slider; 505, sliding rod; 506, first sliding inclined groove; 507, second sliding inclined groove; 508, bolt; 509, reset spring; 510, first sliding groove; 511, second sliding groove; 6, rotor; 7, dynamic air seal tooth. DETAILED DESCRIPTION

[0038] Specific implementation one: see Figures 1-5 As shown in the figure, a self-locking steam turbine air seal, the embodiment includes air seal body 1, the air seal body 1 is provided with T-shaped groove 2, the T-shaped groove 2 is composed of horizontal part 201 and vertical part 202; it also includes multi-section plug-in type air seal device, the multi-section plug-in type air seal device is detachably inserted in T-shaped groove 2, forming a circular ring air seal; Each section of plug-in type air seal device includes throat neck 3, static air seal tooth 4 and movable plug tongue mechanism, the throat neck 3 is inserted in the vertical part 202 of T-shaped groove 2, the lower end of throat neck 3 is provided with static air seal tooth 4, and static air seal tooth 4 is matched with dynamic air seal tooth 7 on rotor 6, and the throat neck 3 is provided with movable plug tongue mechanism that can be extended and retracted slidingly with the horizontal part 201 of T-shaped groove 2.

[0039] Further, the gas seal body 1 is a casing part of the steam turbine, and the T-shaped slot 2 is divided into a horizontal part 201 at the top end and a vertical part 202. The vertical part 202 of the T-shaped slot 2 has the same width as the throat neck 3, and can be inserted and matched. The movable plug mechanism can be inserted and matched with the horizontal part 201 of the T-shaped slot 2, and the throat neck 3 and the gas seal body 1 are fixed. The cavity for installing the movable plug mechanism is arranged in the throat neck 3.

[0040] When the plug-in type gas seal device needs to be replaced, the movable plug mechanism is retracted into the throat neck 3 from the horizontal part 201 of the T-shaped slot 2, so that the plug-in type gas seal device is taken out from the T-shaped slot 2 along the vertical part 202; when the gas seal is fixed, the movable plug mechanism is extended out of the throat neck 3 and inserted into the horizontal part 201 of the T-shaped slot 2, so that the throat neck 3 and the gas seal body 1 are fixed; through the above operation, the plug-in type gas seal device is quickly replaced and fixed.

[0041] Further, the static gas seal tooth 4 in the embodiment is designed to have four gas seal teeth, the static gas seal tooth 4 and the dynamic gas seal tooth 7 on the rotor 6 are alternately arranged, and the gap is matched to form a labyrinth structure, which effectively reduces the steam leakage.

[0042] Specific implementation method two: referring to Figures 6-8 As shown in the figure, the movable plug mechanism of the embodiment includes an even number of synchronous extension assemblies and a linkage mechanism; the even number of synchronous extension assemblies are respectively located on the left and right sides of the linkage mechanism in a symmetrical manner, and are simultaneously extended out of the throat neck 3 and clamped on the horizontal part 201 under the driving of the linkage mechanism.

[0043] Further, when the plug-in type gas seal device needs to be fixed, the synchronous extension assemblies can be extended out of the left side or the right side of the throat neck 3 and clamped on the horizontal part 201, and the number of synchronous extension assemblies extended out of the left side and the right side is the same, so that the plug-in type gas seal device is uniformly stressed. When the plug-in type gas seal device is disassembled, the synchronous extension assemblies are retracted and flush with the side wall of the throat neck 3, so that the synchronous extension assemblies do not interfere with the horizontal part 201 during disassembly, and the disassembly is smooth.

[0044] Specific implementation method three: referring to Figures 6-8 As shown in the figure, each synchronous extension assembly of the embodiment includes a first sliding block 501 and a second sliding block 502; the first sliding block 501 and the second sliding block 502 are oppositely arranged in the width direction of the throat neck 3, and the left end face of the first sliding block 501 and the right end face of the second sliding block 502 are provided with a plug 503 which can be extended out of the throat neck 3, and the plug 503 can be inserted into the horizontal part 201 of the T-shaped slot 2.

[0045] Further, the first slider 501 and the second slider 502 are both cuboid structures, and the inner wall of the throat neck 3 limits the first slider 501 and the second slider 502, so that they can only slide in the throat neck 3 along the width direction. The side wall of the throat neck 3 is provided with a square opening, through which the plug 503 can extend or retract. In the embodiment, two first sliders 501 and two second sliders 502 are provided, and the first sliders 501 and the second sliders 502 are alternately arranged.

[0046] The linkage mechanism is used to drive each first slider 501 and second slider 502 to slide synchronously, so as to ensure that the plug 503 keeps consistent action during extension or retraction, thereby improving the stability and convenience of the plug-in type air seal device during installation and disassembly.

[0047] Specific implementation four: referring to Figures 6-8 The linkage mechanism of the embodiment includes a third slider 504, a sliding rod 505, and a bolt 508. The third slider 504 is vertically slidingly installed in the throat neck 3, and the middle part of the third slider 504 is provided with a sliding rod 505 on each side. The middle part of the first slider 501 and the second slider 502 is respectively provided with a first sliding inclined groove 506 and a second sliding inclined groove 507, and the inclination directions of the first sliding inclined groove 506 and the second sliding inclined groove 507 are opposite.

[0048] The sliding rod 505 is arranged in the first sliding inclined groove 506 and the second sliding inclined groove 507. After the bolt 508 is sequentially slidingly arranged through the third slider 504 and the throat neck 3 upwards, only the upper part of the bolt 508 is threadedly connected with the air seal body 1. The sliding rod 505 and the third slider 504 vertically displace with the screwing degree between the bolt 508 and the air seal body 1. The sliding rod 505 generates the extension and retraction movement trend of the plug 503 by extruding the inner side walls of the first sliding inclined groove 506 and the second sliding inclined groove 507, so as to realize the disassembly of the plug-in type air seal device and the T-shaped groove 2.

[0049] Further, the third slider 504 is slidingly installed in the middle part of the throat neck 3, and the throat neck 3 limits the third slider 504, so that the third slider 504 can only slide in the throat neck 3 along the vertical direction. The sliding rod 505 is columnar and integrally formed with the third slider 504.

[0050] The first sliding inclined groove 506 is arranged from the lower left to the upper right of the first slider 501, and the second sliding inclined groove 507 is arranged from the upper left to the lower right of the second slider 502. The sliding rod 505 is arranged in the first sliding inclined groove 506 and the second sliding inclined groove 507, and in the initial state, the sliding rod 505 is located at the bottom of the first sliding inclined groove 506 and the second sliding inclined groove 507.

[0051] The movement trend of the embodiment is that the plug 503 is driven to extend or retract, specifically, when the third slider 504 moves upward, the sliding rod 505 pushes the left side wall of the first sliding chute 506 and the right side wall of the second sliding chute 507, drives the first slider 501 to move leftward and the second slider 502 to move rightward, and the plug 503 is extended. Similarly, when the third slider 504 moves downward, the sliding rod 505 pushes the right side wall of the first sliding chute 506 and the left side wall of the second sliding chute 507, drives the first slider 501 to move rightward and the second slider 502 to move leftward, and the plug 503 is retracted.

[0052] A circular hole is provided in the middle of the housing of the throat neck 3, the circular hole is coaxially arranged with the bolt 508 mounted on the third slider 504, the middle and upper part of the rod of the bolt 508 slides through the circular hole of the throat neck 3. The bolt 508 is used to drive the third slider 504 to move upward, the bolt head of the bolt 508 abuts against the lower end surface of the third slider 504, and the middle and upper part of the bolt 508 is threadedly connected to the gas seal body 1. By tightening the bolt 508, the bolt 508 moves upward and pushes the third slider 504 to move upward, the third slider 504 cooperates with the synchronous extension assembly to make the plug extend and be clamped on the horizontal part 201, thereby realizing the fixing function of the plug-in gas seal device.

[0053] Specific implementation method five: see Figures 6-8 As shown in the figure, the plug 503 of the embodiment is in a flat strip structure and is attached to the lower end surface of the horizontal part 201 of the T-shaped groove 2.

[0054] Further, since the overall T-shaped groove 2 is semicircular, the lower end surface of the plug 503 is provided as a circular arc matched with the T-shaped groove 2, so as to ensure the maximum contact area and uniform stress.

[0055] Specific implementation method six: see Figures 6-7 As shown in the figure, the first sliding chute 506 and the second sliding chute 507 of the embodiment are long strip holes.

[0056] Further, the first sliding chute 506 and the second sliding chute 507 are provided as through long strip holes. The sliding rod 505 is convenient to pass through each first sliding chute 506 and second sliding chute 507.

[0057] Specific implementation method seven: see Figure 8 As shown in the figure, the bolt head on the bolt 508 is embedded in the lower part of the third slider 504, and the bolt 508 and the cooperation surface of the third slider 504 are in shaft hole cooperation, and the middle to upper part of the bolt 508 is provided with external threads.

[0058] Further, the third sliding block 504 is provided with a counterbore, and the bolt head of the bolt 508 is arranged in the counterbore to push the third sliding block 504 to move upward.

[0059] Specific embodiment eight: refer to Figures 6-8 As shown in the figure, the linkage mechanism of the embodiment further comprises a reset spring 509, which is sleeved on the bolt 508 between the third sliding block 504 and the throat neck 3. When the upper part of the bolt 508 is unscrewed from the air seal body 1, the reset spring 509 releases the pre-tightening force and provides a downward force for the third sliding block 504, so that the sliding rod 505 drives the plug 503 on the first sliding block 501 and the second sliding block 502 to retract in the transverse part 201 of the T-shaped slot 2.

[0060] Further, the reset spring 509 is in a compressed state during installation, so that the third sliding block 504 has a downward movement tendency, and is used to push the third sliding block 504 to move downward during disassembly of the plug-in air seal device.

[0061] When the plug-in air seal device is fixed, the third sliding block 504 moves upward by screwing the bolt 508, the reset spring 509 is compressed, and the reset spring 509 accumulates elastic potential energy.

[0062] When the plug-in air seal device is disassembled, the bolt 508 is loosened, the reset spring 509 releases the elastic potential energy, and the reset spring 509 pushes the third sliding block 504 to move downward, thereby completing the retraction action of the plug 503.

[0063] Specific embodiment nine: refer to Figure 9 As shown in the figure, the throat neck 3 of the embodiment is provided with a second sliding groove 511, and the third sliding block 504 is slidingly connected in the second sliding groove 511.

[0064] The left and right sides of the second sliding groove 511 are symmetrically provided with a plurality of first sliding grooves 510, and each first sliding groove 510 is slidingly installed with a synchronous extension assembly.

[0065] Further, the first sliding block 501 and the second sliding block 502 are slidingly connected in the first sliding groove 510, and the first sliding groove 510 limits the first sliding block 501 and the second sliding block 502 to offset the deflection torque in the sliding process. Ensure that the first sliding block 501 and the second sliding block 502 slide along their respective predetermined trajectories. The third sliding block 504 is slidingly connected in the second sliding groove 511, and its function is the same as above.

[0066] Specific embodiment ten: refer to Figures 1-3 As shown in the figure, the static air seal tooth 4 of the embodiment is inclined towards the air inlet side and is in a circular arc shape, and the thickness gradually decreases.

[0067] Further, the static gas seal tooth 4 is arranged in an inclined state, for improving the labyrinth sealing effect, when the steam passes, the gap between the rotor 6 and the static gas seal tooth 4 forms a vortex opposite to the steam inlet direction, the vortex collides with the steam, slows down the flow rate at the gap to enhance the sealing effect. The static gas seal tooth 4 is inclined towards the steam inlet side and forms a circular arc surface 401, the circular arc surface 401 optimizes the guiding effect of the steam, the arc shape is similar to the profile of the vortex, so that the steam can form a vortex more smoothly when passing through.

[0068] In combination Figures 1 to 9 The working principle of the utility model is explained as follows:

[0069] When the plug-in type gas seal device needs to be installed, first, the throat neck 3 is inserted into the gas seal body 1, at this time, the first sliding block 501 and the second sliding block 502 are retracted in the throat neck 3, the bolt 508 is screwed into the gas seal body 1, at this time, the third sliding block 504 moves upward under the pushing of the bolt 508, the third sliding block 504 drives the sliding rod 505 to move upward, with the sliding rod 505 sliding upward in the first sliding inclined groove 506 and the second sliding inclined groove 507, the sliding rod 505 drives the first sliding block 501 and the second sliding block 502 to slide to both sides respectively, so that the insertion tongues 503 of the first sliding block 501 and the second sliding block 502 extend into the horizontal part 201 of the T-shaped slot 2, and the self-locking installation and fixation are completed. The self-locking refers to that the insertion tongues 503 are clamped on the horizontal part 201 by extending to realize self-fixing, and prevent the throat neck 3 from falling off during the installation process of the plug-in type gas seal device.

[0070] When the plug-in type gas seal device needs to be disassembled, the bolt 508 is unscrewed, the third sliding block 504 moves downward under the action of the reset spring 509, the third sliding block 504 drives the sliding rod 505 to slide downward, with the sliding rod 505 sliding downward in the first sliding inclined groove 506 and the second sliding inclined groove 507, the sliding rod 505 drives the first sliding block 501 and the second sliding block 502 to be retracted in the throat neck 3, so that the insertion tongues 503 are separated from the horizontal part 201 of the T-shaped slot 2, and the disassembly operation is completed.

[0071] The above embodiments are only used to illustrate the technical solutions of the utility model, but not limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and range of the technical solutions of the embodiments of the utility model.

Claims

1. A self-locking steam turbine gas seal, comprising a gas seal body (1), wherein a T-shaped groove (2) is provided on the gas seal body (1), and the T-shaped groove (2) is composed of a horizontal part (201) and a vertical part (202); Its features are: It also includes a multi-segment plug-in air seal device, which can be detachably plugged into the T-slot (2) to form a circular air seal; Each plug-in air seal device includes a throat (3), a static air seal tooth (4), and a movable tongue mechanism. The throat (3) is inserted into the vertical part (202) of the T-shaped groove (2). The lower end of the throat (3) is provided with a static air seal tooth (4), and the static air seal tooth (4) is adapted to the dynamic air seal tooth (7) on the rotor (6). The throat (3) is provided with a movable tongue mechanism that can be extended and slidably inserted into the horizontal part (201) of the T-shaped groove (2).

2. The self-locking turbine gas seal according to claim 1, characterized in that: The movable tongue mechanism includes an even number of synchronously extending components and a linkage mechanism; the even number of synchronously extending components are located symmetrically on the left and right sides of the linkage mechanism, and under the drive of the linkage mechanism, they simultaneously extend the throat (3) and lock onto the transverse part (201).

3. The self-locking turbine gas seal according to claim 2, characterized in that: Each synchronous extension component includes a first slider (501) and a second slider (502); The first slider (501) and the second slider (502) are slidably mounted in the width direction of the throat (3) and are arranged opposite to each other. The left end face of the first slider (501) and the right end face of the second slider (502) are provided with tongues (503) that can extend out of the throat (3). The tongues (503) can be inserted into the transverse part (201) of the T-shaped groove (2).

4. The self-locking turbine gas seal according to claim 3, characterized in that: The linkage mechanism includes a third slider (504), a sliding rod (505), and a bolt (508); A third slider (504) is vertically slidably installed on the inner edge of the throat (3), and a sliding rod (505) is provided on the left and right sides of the middle part of the third slider (504). The first sliding groove (506) is opened from the lower left to the upper right of the first slider (501), and the second sliding groove (507) is opened from the upper left to the lower right of the second slider (502); The sliding rod (505) passes through both the first sliding groove (506) and the second sliding groove (507), and in the initial state, the sliding rod (505) is at the bottom of the first sliding groove (506) and the second sliding groove (507); After the bolt (508) slides upward through the third slider (504) and the throat (3) in sequence, only the upper part of the bolt (508) is threadedly connected to the air seal body (1). The sliding rod (505) and the third slider (504) produce vertical displacement according to the degree of twisting between the bolt (508) and the air seal body (1). The sliding rod (505) produces a tendency to extend and retract the tongue (503) by squeezing the inner sidewall of the first sliding groove (506) and the second sliding groove (507), thereby realizing the disassembly and assembly of the plug-in air seal device and the T-slot (2).

5. The self-locking turbine gas seal according to claim 4, characterized in that: The tongue (503) has a flat, elongated structure and fits against the lower end face of the transverse part (201) of the T-shaped groove (2).

6. The self-locking turbine gas seal according to claim 5, characterized in that: The first sliding groove (506) and the second sliding groove (507) are elongated slots.

7. The self-locking turbine gas seal according to claim 6, characterized in that: The bolt head on the bolt (508) is embedded in the lower part of the third slider (504), and the mating surfaces of the bolt (508) and the third slider (504) are in a shaft-hole fit. The bolt (508) has external threads from the middle to the top.

8. The self-locking turbine gas seal according to claim 7, characterized in that: The linkage mechanism also includes a return spring (509), which is fitted on the bolt (508) between the third slider (504) and the throat (3). When the upper part of the bolt (508) is unscrewed off the gas seal body (1), the return spring (509) releases the preload and provides a downward force to the third slider (504), causing the sliding rod (505) to drive the tongue (503) on the first slider (501) and the second slider (502) to retract in the transverse part (201) of the T-slot (2).

9. The self-locking turbine gas seal according to claim 8, characterized in that: The throat (3) is provided with a second sliding groove (511), and the third slider (504) is slidably connected in the second sliding groove (511); The second sliding groove (511) has multiple first sliding grooves (510) symmetrically arranged on the left and right sides, and a synchronous extension component is slidably installed in each first sliding groove (510).

10. The self-locking turbine gas seal according to claim 9, characterized in that: The static air seal tooth (4) faces the air intake side and is inclined in an arc shape, and its thickness gradually decreases.

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