Steam seal of steam turbine

Abstract

The utility model discloses a steam turbine steam seal which comprises a steam seal body, a steam seal sleeve is arranged in the steam seal body, the bottom of the steam seal sleeve penetrates through the steam seal body and extends to the outside of the steam seal body, a pluggable sealing plate is arranged at the bottom of the steam seal body, and a positioning connecting assembly used for limiting the sealing plate is arranged on the steam seal sleeve. The steam sealing sleeve is provided with a limiting and fixing assembly used for limiting the positioning and connecting assembly, steam sealing teeth are installed at the bottom of the sealing plate, the positioning and connecting assembly comprises two inserting blocks, and the two inserting blocks are installed on the left side and the right side of the top of the sealing plate respectively. Through the arrangement of the positioning connecting assembly and the limiting fixing assembly, after the steam sealing teeth are abraded, the sealing plate and the abraded steam sealing teeth can be taken down for replacement, the whole steam sealing structure does not need to be disassembled, resource waste is avoided, the disassembling and assembling process is simple and convenient, meanwhile, the stability of the sealing plate installed on the steam sealing sleeve is guaranteed, and the service life of the sealing plate is prolonged. And the practicability is improved.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine sealing technology, specifically a steam turbine seal. Background Technology

[0002] Air sealing is a sealing technology used in high-speed rotating equipment such as steam turbines. It aims to reduce the leakage of working media such as steam and prevent outside air from entering the machine. By forming an effective seal between moving and stationary parts, it significantly improves the efficiency and safety of equipment operation. Air sealing is a key component to ensure the efficient and stable operation of rotating equipment.

[0003] According to application number CN202223282177.4, a steam seal structure for a steam turbine is disclosed, including a steam seal body, a rotor and a steam seal sleeve disposed inside the steam seal body, wherein the axis of the steam seal body and the axis of the rotor are on the same axis, and a plurality of sealing plates are fixedly installed on the inner wall of the steam seal sleeve, wherein the cross-section of the sealing plate is triangular.

[0004] In the above case, the steam seal structure is fixed on the steam seal sleeve, resulting in a single steam seal structure. When the steam seal teeth need to be replaced due to excessive wear, the entire steam seal component can only be replaced, and the steam seal teeth cannot be replaced locally, resulting in excessive operating costs and thus causing certain resource waste. Utility Model Content

[0005] The purpose of this invention is to provide a steam turbine seal to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a steam turbine seal, comprising a seal body, a seal sleeve disposed inside the seal body, the bottom of the seal sleeve penetrating the seal body and extending to its exterior, a pluggable sealing plate disposed at the bottom of the seal body, a positioning connection assembly for limiting the sealing plate disposed on the seal sleeve, a limiting fixing assembly for limiting the positioning connection assembly disposed on the seal sleeve, and a seal tooth installed at the bottom of the sealing plate.

[0007] Preferably, the positioning connection assembly includes two inserts, which are respectively installed on the left and right sides of the top of the sealing plate. A slot is provided at the bottom of the front of the gas seal sleeve and at the position corresponding to the insert. The top of the insert corresponds to the slot and extends into it to contact the inner wall of the slot.

[0008] Preferably, the slot is provided with an adjustable block for movable blocks, and a locking block is installed on the side of the two adjustable blocks that are far apart from each other. The insert block is provided with a slot on the side of the locking block that is close to the locking block and at the position corresponding to the locking block.

[0009] Preferably, a connecting block is installed on the top of the side of the adjusting block near the card block, and a pull plate is installed on the side of the connecting block away from the adjusting block that passes through the slot and extends to its outside.

[0010] Preferably, the limiting and fixing component includes a limiting frame, which is disposed on the surface of the gas seal sleeve, and a limiting groove adapted to the connecting block is provided at the bottom of the limiting frame and at the position corresponding to the connecting block.

[0011] Preferably, a recessed block is installed on the left side of the limiting frame, a rotating block is provided on the left side of the recessed block, and a threaded rod that is threadedly connected to the recessed block is installed on the right side of the rotating block. The right end of the threaded rod passes through the recessed block and the limiting frame from left to right and extends to the outside of the limiting frame. A positioning block is installed on the right end of the threaded rod, and a positioning groove is provided on the left side of the gas seal sleeve at the position corresponding to the positioning block.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model, by setting up a positioning connection component and a limiting fixing component, allows the sealing plate and worn steam seal teeth to be removed and replaced when they are worn, without disassembling the entire steam seal structure, thus avoiding waste of resources. Moreover, the disassembly and assembly process is simple and convenient, while ensuring the stability of the sealing plate installed on the steam seal sleeve, thereby improving practicality. Attached Figure Description

[0014] Figure 1 This is a structural cross-sectional view of the front view of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the gas seal sleeve, sealing plate, positioning and connecting assembly, limiting and fixing assembly, and gas seal teeth of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the limiting frame and limiting groove of this utility model;

[0017] Figure 4 This is a structural cross-sectional view of the positioning connection component and the limiting and fixing component of this utility model from the front view;

[0018] Figure 5 This is a structural cross-sectional view of the front view of the steam seal tooth and wear-resistant layer of this utility model.

[0019] In the diagram: 1. Steam seal body, 2. Steam seal sleeve, 3. Sealing plate, 4. Positioning connection assembly, 41. Insert block, 42. Slot, 43. Adjusting block, 44. Locking block, 45. Locking groove, 46. Connecting block, 47. Pull plate, 48. Slide groove, 49. Slide rod, 410. Slider, 411. Buffer spring, 5. Limiting and fixing assembly, 51. Limiting frame, 52. Limiting groove, 53. Concave block, 54. Rotating block, 55. Threaded rod, 56. Positioning block, 57. Positioning groove, 6. Steam seal tooth, 7. Rotor, 8. Rotating tooth, 9. Wear-resistant layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 A steam turbine seal includes a seal body 1, a seal sleeve 2 disposed inside the seal body 1, the bottom of the seal sleeve 2 penetrating the seal body 1 and extending to its exterior, a pluggable sealing plate 3 disposed at the bottom of the seal body 1, the top of the sealing plate 3 contacting the bottom of the seal sleeve 2, a positioning connection component 4 for limiting the sealing plate 3 disposed on the seal sleeve 2, a limiting fixing component 5 for limiting the positioning connection component 4 disposed on the seal sleeve 2, a seal tooth 6 fixedly connected to the bottom of the sealing plate 3, a rotor 7 disposed below the seal sleeve 2, a rotating tooth 8 for cooperating with the seal tooth 6 fixedly connected to the surface of the rotor 7, a wear-resistant layer 9 coated on the surface of the seal tooth 6, the wear-resistant layer 9 being made of chromium nitride film to improve the wear resistance of the seal tooth 6.

[0022] The positioning connection component 4 includes two insert blocks 41, which are respectively installed on the left and right sides of the top of the sealing plate 3. A slot 42 is provided at the bottom of the front of the gas seal sleeve 2, corresponding to the position of the insert block 41. The top of the insert block 41 corresponds to the slot 42 and extends into it, contacting the inner wall of the slot 42. An adjustment block 43 with movable blocks is provided inside the slot 42. The side of the adjustment block 43 near the insert block 41 contacts the insert block 41. A locking block 44 is fixedly connected to the side of the two adjustment blocks 43 that is away from each other. A slot 45 is provided on the side of the insert block 41 near the locking block 44, corresponding to the position of the locking block 44. The side of the locking block 44 near the slot 45 passes through the slot 45 and extends into it, contacting the inner wall of the slot 45. A connecting block 46 is fixedly connected to the top of the side of the adjustment block 43 near the locking block 44. A pull plate 47 is fixedly connected to the side of the connecting block 46 away from the adjustment block 43, passing through the slot 42 and extending outward.

[0023] The limiting and fixing assembly 5 includes a limiting frame 51, which is disposed on the surface of the gas seal sleeve 2. The inner wall of the limiting frame 51 slides in contact with the surface of the gas seal sleeve 2. The side of the limiting frame 51 near the pull plate 47 is in contact with the pull plate 47. A limiting groove 52 adapted to the connecting block 46 is provided at the bottom of the limiting frame 51 and at the position corresponding to the connecting block 46. The top of the inner wall of the limiting groove 52 is in contact with the top of the connecting block 46. A recess 53 is fixedly connected to the left side of the limiting frame 51. A rotating block 54 is provided on the left side of the recess 53. The rotating block 54 is close to the recess 53. One side of the rotating block 54 is in contact with the concave block 53. The right side of the rotating block 54 is fixedly connected to a threaded rod 55 that is threadedly connected to the concave block 53. The right end of the threaded rod 55 passes through the concave block 53 and the limiting frame 51 from left to right and extends to the outside of the limiting frame 51. The right end of the threaded rod 55 is fixedly connected to a positioning block 56. The left side of the gas seal sleeve 2 and the position corresponding to the positioning block 56 are provided with a positioning groove 57. The right side of the positioning block 56 passes through the positioning groove 57 and extends into it, contacting the inner wall of the positioning groove 57. The positioning block 56 and the positioning groove 57 are both cylindrical in shape.

[0024] A groove 48 is provided at the top of the inner wall of slot 42. The left and right sides of the inner wall of groove 48 are fixedly connected by a sliding rod 49. A slider 410 is slidably connected to the surface of the sliding rod 49. The bottom of the slider 410 is fixedly connected to the top of the adjusting block 43. A buffer spring 411 is provided on the surface of the sliding rod 49, as shown in the figure. At this time, the buffer spring 411 is in a compressed state and has the force to drive the slider 410 away from the limit frame 51. Through the release force of the buffer spring 411, when the limit frame 51 separates from the pull plate 47, the buffer spring 411 immediately drives the adjusting block 43 away from the limit frame 51 through the slider 410. The adjusting block 43 drives the pull plate 47 to move closer to the gas seal sleeve 2 through the connecting block 46, so that the locking block 44 is automatically pulled out from the slot 45, which further improves the convenience of disassembly and assembly. By setting the sliding rod 49 and the slider 410, the stability of the adjusting block 43 when moving left and right is also improved.

[0025] By setting the positioning connection component 4 and the limiting and fixing component 5, when the steam seal tooth 6 is worn, the sealing plate 3 and the worn steam seal tooth 6 can be removed and replaced without disassembling the entire steam seal structure, thus avoiding waste of resources. Moreover, the disassembly and assembly process is simple and convenient, while ensuring the stability of the sealing plate 3 installed on the steam seal sleeve 2, thereby improving practicality.

[0026] When in use, when the steam seal tooth 6 is in contact with the rotating tooth 8 for a long time and causes severe wear, it can be disassembled and replaced. When disassembling, first rotate the rotating block 54. The rotating block 54 drives the threaded rod 55 to rotate to the left, so that the positioning block 56 rotates to the left and is pulled out from the positioning groove 57.

[0027] Then pull the limiting frame 51 upwards, and the limiting frame 51 separates from the pull plate 47. After the pull plate 47 and the limiting frame 51 separate, the restoring force of the buffer spring 411 causes the buffer spring 411 to move the pull plate 47 closer to the steam seal sleeve 2. The buffer spring 411 drives the locking block 44 to automatically pull out of the slot 45 through the adjusting block 43. Then pull the sealing plate 3 forward, and the sealing plate 3 drives the insert block 41 to move forward, so that the insert block 41 is pulled out of the slot 42, which allows the sealing plate 3 to drive the steam seal tooth 6 to be disassembled.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam seal for a steam turbine, characterized in that: The device includes a steam seal body (1), a steam seal sleeve (2) is provided inside the steam seal body (1), the bottom of the steam seal sleeve (2) penetrates the steam seal body (1) and extends to its outside, a pluggable sealing plate (3) is provided at the bottom of the steam seal body (1), a positioning connection assembly (4) for limiting the sealing plate (3) is provided on the steam seal sleeve (2), a limiting fixing assembly (5) for limiting the positioning connection assembly (4) is provided on the steam seal sleeve (2), and a steam seal tooth (6) is installed at the bottom of the sealing plate (3).

2. The steam turbine seal according to claim 1, characterized in that: The positioning connection assembly (4) includes two inserts (41) which are respectively installed on the left and right sides of the top of the sealing plate (3). The bottom of the front of the gas seal sleeve (2) and the position corresponding to the insert (41) are provided with slots (42). The top of the insert (41) corresponds to the slot (42) and extends into it to contact the inner wall of the slot (42).

3. The steam turbine seal according to claim 2, characterized in that: The slot (42) is provided with an adjustable block (43) that can move. Each of the two adjustable blocks (43) is equipped with a locking block (44) on the side that is far away from each other. The insert (41) is provided with a slot (45) on the side that is close to the locking block (44) and corresponding to the position of the locking block (44).

4. The steam turbine seal according to claim 3, characterized in that: A connecting block (46) is installed on the top of the side of the adjusting block (43) near the locking block (44), and a pull plate (47) is installed on the side of the connecting block (46) away from the adjusting block (43) through the slot (42) and extending to its outside.

5. The steam turbine seal according to claim 4, characterized in that: The limiting and fixing component (5) includes a limiting frame (51), which is disposed on the surface of the gas seal sleeve (2). A limiting groove (52) adapted to the connecting block (46) is provided at the bottom of the limiting frame (51) and at the position corresponding to the connecting block (46).

6. The steam turbine seal according to claim 5, characterized in that: A recess (53) is installed on the left side of the limiting frame (51), and a rotating block (54) is provided on the left side of the recess (53). A threaded rod (55) that is threadedly connected to the recess (53) is installed on the right side of the rotating block (54). The right end of the threaded rod (55) passes through the recess (53) and the limiting frame (51) from left to right and extends to the outside of the limiting frame (51). A positioning block (56) is installed on the right end of the threaded rod (55). A positioning groove (57) is provided on the left side of the gas seal sleeve (2) at the position corresponding to the positioning block (56).

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