A steam turbine shaft end seal structure device

Abstract

The utility model discloses a steam turbine shaft end sealing structure device, including steam turbine shaft body, the side of steam turbine shaft body is provided with and steam turbine shaft body cooperation uses the steam seal casing, be provided with the sealing assembly for sealing steam turbine shaft body and steam seal casing between steam seal casing and steam turbine shaft body, the side of steam turbine shaft body is provided with the positioning slide bar, the side of steam seal casing and the position of corresponding positioning slide bar is provided with the annular slide groove of matching with positioning slide bar. The utility model passes through dynamic self -adaptation sealing structure, multistage collaborative leak reduction mechanism, rolling -sliding composite sealing technology three big innovations, solved the technical bottleneck of steam cylinder deformation adaptability bad, sealing assembly abrasion fast, high leakage rate in the prior art, provided high reliability, long -lived solution for supercritical steam turbine shaft end sealing, has remarkable economic benefit and social value.

Description

Technical Field

[0001] This utility model relates to the field of turbine shaft end sealing technology, and in particular to a turbine shaft end sealing structure device. Background Technology

[0002] During turbine operation, the shaft end sealing performance directly affects the unit's safety and economy. Existing technologies (such as CN220015275U) indicate that turbine shaft end sealing structures face the following technical challenges: Cylinder deformation leads to seal failure: During operation, the cylinder is subjected to multi-directional loads such as steam pressure difference, pipeline thermal stress, and the weight of moving and stationary components, which causes nonlinear deformation of the cylinder mating surface and dynamic changes in the dynamic and static clearance at the shaft end. Traditional fixed clearance structures such as labyrinth seals are difficult to adapt to the deformed working conditions, and the leakage rate increases significantly.

[0003] Insufficient wear and stability of sealing components: When the steam turbine rotates at high speed (usually above 3000 r / min), the sealing teeth and the rotor surface experience high-frequency friction. In the existing technology, the sealing block and the fixed structure are mostly rigidly connected. After wear, the gap increases and cannot be automatically compensated, resulting in a rapid decline in sealing performance.

[0004] Poor dynamic adaptability of the sealing structure: Existing technologies (such as the prior art CN220015275U) achieve static clearance adjustment through elastic washers and spring plates, but cannot respond in real time to dynamic changes such as cylinder thermal expansion and vibration. Especially when operating under variable conditions (such as start-up and shutdown, load fluctuations), the risk of seal failure is aggravated.

[0005] Insufficient coordination of multi-stage seals: In existing technologies, shaft end seals mostly rely on single-stage sealing teeth or simple labyrinth structures, which cannot effectively disperse steam pressure gradients. High-pressure steam is prone to turbulent leakage at the sealing gap, reducing the overall sealing efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a turbine shaft end sealing structure device. Through three major innovations—dynamic adaptive sealing structure, multi-stage collaborative leakage reduction mechanism, and rolling-sliding composite sealing technology—it solves the technical bottlenecks of poor cylinder deformation adaptability, rapid wear of sealing components, and high leakage rate in the existing technology. It provides a highly reliable and long-life solution for ultra-supercritical turbine shaft end sealing, with significant economic benefits and social value.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include: A turbine shaft end sealing structure device, comprising: A steam turbine shaft body, wherein a steam seal housing is provided on the side of the steam turbine shaft body for use in conjunction with the steam turbine shaft body, and a sealing assembly for sealing the steam turbine shaft body and the steam seal housing is provided between the steam seal housing and the steam turbine shaft body, the sealing assembly including a fixed sealing block fixedly connected to the steam seal housing and a rotating sealing block fixedly connected to the end of the steam turbine shaft body, the rotating sealing block and the fixed sealing block being sealed and connected by an annular sealing body.

[0008] In the aforementioned turbine shaft end sealing structure device, a positioning slide rod is provided on the side of the turbine shaft, and an annular slide groove matching the positioning slide rod is provided on the side of the steam seal housing at the position corresponding to the positioning slide rod.

[0009] In the aforementioned turbine shaft end sealing structure device, the fixed sealing block is provided with an annular connecting groove two that matches the annular sealing body, and the side of the rotating sealing block is provided with an annular connecting groove one that matches the annular sealing body.

[0010] In the aforementioned turbine shaft end sealing structure device, a rotating sealing ring that is rotatably connected to the annular connecting groove one is fixedly connected to the side of the annular sealing body near the annular connecting groove one, and a sliding sealing ring that is slidably connected to the inner wall of the annular connecting groove two is fixedly connected to the end of the annular sealing body near the annular connecting groove two.

[0011] In the aforementioned turbine shaft end sealing structure device, a ball bearing is provided on the side of the rotating sealing ring away from the annular sealing body, and the rotating sealing ring is in rolling connection with the inner wall of the annular connecting groove through the ball bearing.

[0012] In the aforementioned turbine shaft end sealing structure device, a spring is provided at one end of the sliding sealing ring away from the annular sealing body, and the other end of the spring is fixedly connected to the inner wall of the second annular connecting groove.

[0013] This utility model has at least the following beneficial effects: 1. This utility model realizes a turbine shaft end sealing structure device. Through three major innovations, namely dynamic adaptive sealing structure, multi-level collaborative leakage reduction mechanism, and rolling-sliding composite sealing technology, it solves the technical bottlenecks of poor cylinder deformation adaptability, rapid wear of sealing components, and high leakage rate in the prior art. It provides a highly reliable and long-life solution for the shaft end sealing of ultra-supercritical turbines, and has significant economic benefits and social value.

[0014] 2. Dynamic gap adaptive compensation: Through the rotating connection design of the annular sealing body and the rotating sealing block, combined with the elastic stress provided by the spring, the sealing assembly automatically adjusts the gap when the cylinder deforms, ensuring that the sealing surface is continuously in contact. The combination design of the rotating sealing ring and the ball converts sliding friction into rolling friction, significantly reducing the wear of the sealing assembly. 3. Multi-stage sealing for synergistic leakage reduction: The structure of "dynamic and static dual sealing" with rotating sealing block and fixed sealing block is adopted, combined with the rotating sealing ring and sliding sealing ring of the annular sealing body, to form a three-stage sealing barrier, realizing the conversion of steam kinetic energy into eddy current dissipation, and further reducing leakage. 4. Enhanced vibration resistance and stability: The rolling fit between the ball and the annular connecting groove reduces the vibration amplitude of traditional sliding friction, significantly suppressing the risk of seal failure caused by vibration. At the same time, the preload design of the spring can balance the dynamic changes of cylinder thermal expansion and mechanical stress, ensuring the stability of the sealing assembly under all working conditions. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the turbine shaft end sealing structure device of this utility model; Figure 2 This is a cross-sectional structural diagram of the turbine shaft end sealing structure device of this utility model; Figure 3 This is a schematic diagram of the sealing component in the turbine shaft end sealing structure device of this utility model.

[0016] Explanation of icon numbers: 1. Steam turbine shaft; 2. Steam seal housing; 3. Sealing assembly; 101. Positioning slide bar; 1011. Annular slide groove; 301. Fixed sealing block; 3011. Rotary sealing block; 302. Annular sealing body; 3021. Annular connecting groove one; 3022. Annular connecting groove two; 303. Rotate the sealing ring; 3031. Slide the sealing ring; 304, ball bearing; 305, spring. Detailed Implementation

[0017] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0018] Please refer to Figures 1 to 3As shown, an embodiment of the present invention provides a turbine shaft end sealing structure device, comprising: a turbine shaft body 1, a steam seal housing 2 for use in conjunction with the turbine shaft body 1 on the side of the turbine shaft body 1, and a sealing assembly 3 for sealing the turbine shaft body 1 and the steam seal housing 2 between the steam seal housing 2 and the turbine shaft body 1; By adopting the above technical solutions, and through three major innovations—dynamic adaptive sealing structure, multi-level collaborative leakage reduction mechanism, and rolling-sliding composite sealing technology—the technical bottlenecks of poor cylinder deformation adaptability, rapid wear of sealing components, and high leakage rate in existing technologies have been solved. This provides a highly reliable and long-life solution for the shaft end seal of ultra-supercritical steam turbines, with significant economic benefits and social value.

[0019] To achieve dynamic alignment between the turbine shaft 1 and the steam seal housing 2 and reduce uneven wear of the sealing assembly 3, in this embodiment: a positioning slide rod 101 is provided on the side of the turbine shaft 1, and an annular groove 1011 matching the positioning slide rod 101 is provided on the side of the steam seal housing 2 at the position corresponding to the positioning slide rod 101. Through the sliding cooperation between the positioning slide rod 101 and the annular groove 1011, the turbine shaft 1 and the steam seal housing 2 maintain coaxiality under thermal expansion and vibration conditions, avoiding unilateral wear of the sealing assembly 3 due to eccentricity and extending the seal life.

[0020] In order to construct a dynamic and static sealing collaborative leakage reduction mechanism and improve sealing efficiency, in this embodiment: the sealing component 3 includes a fixed sealing block 301 fixedly connected to the steam seal housing 2 and a rotating sealing block 3011 fixedly connected to the end of the steam turbine shaft 1. The rotating sealing block 3011 and the fixed sealing block 301 are sealed together by an annular sealing body 302.

[0021] To achieve precise positioning and adaptive adjustment of the sealing assembly 3, in this embodiment: the fixed sealing block 301 has an annular connecting groove 2 3022 that matches the annular sealing body 302, and the side of the rotating sealing block 3011 has an annular connecting groove 1 3021 that matches the annular sealing body 302. The fixed sealing block 301 has an annular connecting groove 2 3022, and the rotating sealing block 3011 has an annular connecting groove 1 3021, providing a bidirectional constraint track for the annular sealing body 302, ensuring that the sealing surface maintains stable contact when the shaft rotates, and suppressing leakage caused by gap fluctuations.

[0022] To reduce frictional loss on the sealing surface and improve the reliability of dynamic sealing, in this embodiment: a rotating sealing ring 303 that is rotatably connected to the annular connecting groove 302 is fixedly connected to the side of the annular sealing body 302 near the annular connecting groove 3021, and a sliding sealing ring 3031 that is slidably connected to the inner wall of the annular connecting groove 3022 is fixedly connected to the end of the annular sealing body 302 near the annular connecting groove 3022. Through the combined design of the dynamic and static sealing rings, frictional loss is greatly reduced while ensuring continuous contact of the sealing surface.

[0023] To enhance the stability of the rotary seal and reduce seal failure caused by vibration, in this embodiment, a ball bearing 304 is provided on the side of the rotary sealing ring 303 away from the annular sealing body 302, and the rotary sealing ring 303 is rolledly connected to the inner wall of the annular connecting groove 3021 through the ball bearing 304.

[0024] To achieve elastic compensation of the sealing gap and adapt to the dynamic deformation of the cylinder, in this embodiment: a spring 305 is provided at one end of the sliding sealing ring 3031 away from the annular sealing body 302, and the other end of the spring 305 is fixedly connected to the inner wall of the annular connecting groove 3022. The spring 305 is provided at the end of the sliding sealing ring 3031, and the preload of the spring 305 provides adaptive stress to the sealing assembly 3, automatically adjusting the gap when the cylinder thermally expands or the pipeline stress changes, so as to ensure that the sealing performance is stable under all working conditions.

[0025] The working principle of this utility model is as follows: Dynamic centering and positioning: The positioning slide rod 101 of the turbine shaft 1 slides and engages with the annular slide groove 1011 of the steam seal housing 2 to ensure that the shaft and housing remain coaxial under thermal deformation and vibration conditions, and to avoid uneven wear of the sealing assembly 3.

[0026] Coupling of sealing assembly 3: Rotating sealing block 3011 rotates with the shaft, driving one end of annular sealing body 302 to slide in annular connecting groove 3022 of fixed sealing block 301, and the other end to roll in annular connecting groove 3021 through rotating sealing ring 303, forming a "dynamic and static double sealing" barrier.

[0027] Elastic stress compensation: Spring 305 provides continuous preload to sliding seal ring 3031, automatically compensating for gap changes caused by cylinder deformation; ball 304 reduces rotational friction and ensures stable contact of sealing surfaces.

[0028] Multi-stage leakage reduction synergy: The dynamic and static sealing rings and the annular sealing body 302 form a three-stage sealing structure. Combined with the meshing design of the second air seal tooth and the first air seal tooth, the leakage rate is greatly reduced.

[0029] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A turbine shaft end sealing structure device, comprising a turbine shaft body (1), characterized in that, The side of the turbine shaft (1) is provided with a steam seal housing (2) for use with the turbine shaft (1). A sealing assembly (3) for sealing the turbine shaft (1) and the steam seal housing (2) is provided between the steam seal housing (2) and the turbine shaft (1). The sealing assembly (3) includes a fixed sealing block (301) fixedly connected to the steam seal housing (2) and a rotating sealing block (3011) fixedly connected to the end of the turbine shaft (1). The rotating sealing block (3011) and the fixed sealing block (301) are sealed together by an annular sealing body (302).

2. The turbine shaft end sealing structure device according to claim 1, characterized in that: The turbine shaft (1) is provided with a positioning slide rod (101) on its side, and the steam seal housing (2) is provided with an annular groove (1011) that matches the positioning slide rod (101) on its side and at the position corresponding to the positioning slide rod (101).

3. The steam turbine shaft end seal structure apparatus of claim 2, wherein: The fixed sealing block (301) has an annular connecting groove 2 (3022) that matches the annular sealing body (302), and the rotating sealing block (3011) has an annular connecting groove 1 (3021) that matches the annular sealing body (302) on its side.

4. The steam turbine shaft end seal structure apparatus of claim 3, wherein: The annular sealing body (302) is fixedly connected to a rotating sealing ring (303) that is rotatably connected to the annular connecting groove one (3021) on one side, and a sliding sealing ring (3031) that is slidably connected to the inner wall of the annular connecting groove two (3022) is fixedly connected to one end of the annular sealing body (302) near the annular connecting groove two (3022).

5. The steam turbine shaft end seal structure apparatus of claim 4, wherein: The rotating sealing ring (303) is provided with a ball (304) on the side away from the annular sealing body (302), and the rotating sealing ring (303) is rolledly connected to the inner wall of the annular connecting groove (3021) through the ball (304).

6. The steam turbine shaft end seal structure apparatus of claim 5, wherein: A spring (305) is provided at one end of the sliding sealing ring (3031) away from the annular sealing body (302), and the other end of the spring (305) is fixedly connected to the inner wall of the annular connecting groove (3022).

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