High-pressure wear-resistant centrifugal turbine impeller

Abstract

The utility model provides a high-pressure wear-resistant centrifugal steam turbine impeller, which relates to the technical field of steam turbine impellers, and comprises a connecting shaft, fan blades, a limiting piece, a mounting plate, a connecting shaft, a connecting shaft, a connecting shaft, a connecting shaft, a connecting shaft, a connecting shaft, a connecting shaft and a connecting shaft, and is characterized in that the limiting piece is arranged outside the fan blades and is used for connecting and limiting the fan blades; the fixing ring is fixedly arranged on the outer sides of the ends of the multiple fan blades, the mounting piece is arranged in the mounting plate, the limiting block is fixedly arranged on the inner side of the mounting plate, and the ends of the fan blades are fixed through the fixing ring and a multi-stage limiting structure of the connecting ring and the limiting plate. Compared with the prior art, the vibration trend of the fan blades under the action of wind power in operation can be effectively limited, it is ensured that the positions of the fan blades are relatively static, the vibration amplitude is greatly reduced, the phenomena of friction, collision frequency and stress concentration between the fan blades and peripheral components are remarkably reduced through vibration reduction, and material fatigue, abrasion and structure looseness caused by high-frequency vibration are avoided.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine impeller technology, and in particular to a high-pressure wear-resistant centrifugal steam turbine impeller. Background Technology

[0002] The turbine impeller is the core rotating component of a steam turbine, mounted on the main shaft. It consists of a rim, a surface, and a hub. It converts the kinetic energy of steam into mechanical energy through moving blades to drive the main shaft to rotate. Its design must take into account material strength, vibration resistance, wear resistance, and sealing performance. For example, the blade root grooves on the rim fix the blades and limit and dampen vibration, the surface shape is optimized according to the operating conditions, and the hub is reliably connected to the main shaft to transmit torque. If the blades are not sufficiently limited, vibration can easily cause wear and efficiency reduction. Steam turbines are widely used in thermal power, nuclear power and other fields, and directly affect the performance and life of the unit.

[0003] A search revealed Chinese patent CN220929484U, which discloses a steam turbine impeller comprising a mounting wheel and blades. The outer wall of the mounting wheel has at least one blade movably mounted in a ring-shaped arrangement. The outer side of the mounting wheel is provided with a disassembly and assembly assembly for quick blade removal. The disassembly and assembly assembly includes a positioning ring and a mounting plate. One end of the mounting plate is fixedly connected to one end of the blade. The outer wall of the mounting wheel has a receiving portion adapted to the mounting plate, which enables the replacement of damaged blades. Undamaged blades and the mounting wheel can be reused, reducing the cost of impeller replacement and maintenance.

[0004] However, during the implementation of the above technical solution, at least the following technical problems were discovered:

[0005] Blades are prone to vibration: Independent blades lack effective linkage and limiting, resulting in large vibration amplitude when rotating at high speed. Friction between the blades and adjacent components or at the blade root causes wear, fatigue cracks, and even breakage, significantly shortening the service life. Vibration causes the actual work direction of the blades to deviate, preventing the steam kinetic energy from being fully converted into mechanical energy. At the same time, frictional heat generation increases additional energy loss and reduces the overall efficiency of the device.

[0006] Lack of linkage between blades: Vibration of a single blade may cause resonance of adjacent blades, disrupting the dynamic balance of the impeller, leading to main shaft wobble, abnormal bearing load, and even severe turbine vibration, threatening the safe operation of the equipment. Frequent vibration and friction require regular maintenance and replacement of worn parts, increasing downtime and labor and material costs. Especially under high pressure and high temperature conditions, the difficulty of maintenance and safety risks increase significantly. Utility Model Content

[0007] The purpose of this invention is to provide a high-pressure wear-resistant centrifugal turbine impeller that can solve the problems of independent blades lacking effective linkage and limiting, large vibration amplitude during high-speed rotation, wear, fatigue cracks, and even breakage caused by friction between blades and adjacent components or at the blade root, significantly shortening service life, vibration causing the actual work direction of the blades to deviate, steam kinetic energy not being fully converted into mechanical energy, frictional heat generation increasing additional energy loss, reducing the overall efficiency of the device, and the possibility of single blade vibration causing resonance between adjacent blades, disrupting the impeller dynamic balance, leading to main shaft sway, abnormal bearing load, and even severe turbine vibration, threatening the safe operation of the equipment. Frequent vibration and friction require regular maintenance and replacement of worn parts, increasing downtime and labor and material costs, especially under high pressure and high temperature conditions, the difficulty of maintenance and safety risks increase significantly.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure wear-resistant centrifugal turbine impeller, including a connecting shaft and fan blades, and a limiting member disposed on the outside of the fan blades for connecting and limiting the fan blades, a mounting plate fixedly disposed on the outside of the connecting shaft, a fixing ring fixedly disposed on the outside of the ends of a plurality of fan blades, a mounting member disposed inside the mounting plate, and a limiting block fixedly disposed on the inside of the mounting plate.

[0009] In a preferred embodiment, the limiting member includes a connecting ring fixedly disposed on the inner side of the plurality of fan blades for connecting the plurality of fan blades, and a limiting plate fixedly disposed on the inner side of the plurality of connecting rings.

[0010] In a preferred embodiment, the fixing ring is a ring structure, and the end of the fixing ring is provided with an inclined structure.

[0011] In a preferred embodiment, the dimensions of the plurality of connecting rings gradually decrease.

[0012] In a preferred embodiment, the mounting component includes a limiting ring fixedly disposed on the inner side of the mounting plate, and a connector disposed on the inner side of the space between the two limiting blocks for connecting multiple fan blades.

[0013] In a preferred embodiment, the inner sides of both the limiting ring and the limiting block are provided with first limiting grooves, and the outer sides of both ends of the connector are provided with protrusions. The protrusions of the connector are located inside the first limiting grooves and are used to limit the connector.

[0014] In a preferred embodiment, a locking head is provided on the outer side of one end of the connector, and a locking groove is provided on the inner side of the other end of the connector, and two adjacent connectors are engaged by the locking head and the locking groove.

[0015] In a preferred embodiment, the arc-shaped structures at the bottom ends of the plurality of fan blades are in close contact.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] 1. This utility model, in use, utilizes a multi-level limiting structure consisting of a fixing ring for the fan blade end and connecting rings and limiting plates to effectively limit the vibration tendency of the fan blade under wind force during operation, ensuring its relatively stationary position and greatly reducing vibration amplitude. This reduction in vibration significantly decreases the frequency of friction and collision between the fan blade and surrounding components, as well as stress concentration, avoiding material fatigue, wear, and structural loosening caused by high-frequency vibration. The design of multiple connecting rings with gradually decreasing dimensions towards the center forms a gradient stiffness support system, ensuring precisely matched constraint stiffness at different radius positions of the fan blade. This reduces vibration amplitude and avoids stress concentration caused by excessive local rigidity. Simultaneously, the stable fan blade position ensures overall impeller dynamic balance, reducing additional impact losses, thereby significantly improving the impeller's wear resistance, extending its service life, reducing maintenance costs, improving the stability and reliability of the turbine operation, and increasing efficiency.

[0018] 2. In use, this utility model, by placing the connector between adjacent limiting blocks, utilizes the protrusions at both ends of the connector to form a precise engagement with the first limiting groove on the limiting block and limiting ring, and the mutual engagement design between the connectors through the locking head and the locking groove, which not only effectively restricts the displacement of the connector, but also significantly reduces the tendency of the fan blade to move at high speed by limiting the outer fan blade at the end of the connector, reducing the friction and stress concentration caused by vibration, greatly improving the wear resistance of the fan blade, and extending the service life of the component. Attached Figure Description

[0019] Figure 1 A schematic diagram of the main structure of a high-pressure wear-resistant centrifugal turbine impeller provided by this utility model;

[0020] Figure 2 A schematic diagram of the structure of the connecting ring and limiting plate in the impeller of a high-pressure wear-resistant centrifugal steam turbine provided by this utility model;

[0021] Figure 3 An exploded view of a high-pressure wear-resistant centrifugal turbine impeller provided for this utility model;

[0022] Figure 4 This utility model provides a high-pressure wear-resistant centrifugal turbine impeller. Figure 3 Enlarged view of point A in the middle.

[0023] Legend:

[0024] 1. Connecting shaft; 101. Mounting plate; 2. Fan blade; 3. Fixing ring; 301. Connecting ring; 302. Limiting plate; 4. Limiting block; 401. Limiting ring; 402. Connecting piece; 403. First limiting groove; 404. Clip; 405. Slot. Detailed Implementation

[0025] 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.

[0026] Example 1

[0027] In this embodiment, a high-pressure wear-resistant centrifugal turbine impeller is provided, such as... Figure 1 and Figure 2 As shown, it includes a connecting shaft 1, a fan blade 2, a fixing ring 3, and a limiting member. The outer side of the connecting shaft 1 is fixedly connected to the inner side of the middle part of the mounting plate 101, and the fan blade 2 is detachably connected to the inner side of the mounting plate 101.

[0028] The limiting component includes: a fixing ring 3 fixedly connected to the outer side of the end of the fan blade 2. The fixing ring 3 is a ring structure used to fix multiple fan blades 2 and keep them relatively stationary. Multiple connecting rings 301 are fixedly connected to the inner side of the fan blade 2. The connecting rings 301 are ring structures. The size of the multiple connecting rings 301 gradually decreases. At the same time, the multiple connecting rings 301 are also connected to each other through a limiting plate 302 to ensure the relative stationary position of the multiple connecting rings 301.

[0029] In the specific implementation process: When the device is started, the connecting shaft 1 drives multiple fan blades 2 to rotate through the mounting plate 101. While rotating, each fan blade 2 tends to vibrate under the action of wind. At this time, the vibration of the fan blade 2 is reduced by the fixing ring 3 fixing the end of the fan blade 2. At the same time, the multiple connecting rings 301 further limit and fix the fan blade 2, and the limiting plate 302 limits the multiple connecting rings 301, further ensuring the stability between each fan blade 2.

[0030] Example 2

[0031] In this embodiment, a high-pressure wear-resistant centrifugal turbine impeller is provided, such as... Figure 3 and Figure 4 As shown, it includes a connecting shaft 1, a fan blade 2, a retaining ring 3, and a mounting component, wherein the outer side of the connecting shaft 1 is fixedly connected to the inner side of the middle part of the mounting plate 101.

[0032] The mounting components include: a limiting block 4 and a limiting ring 401 fixedly connected to the inner side of the mounting plate 101. The limiting ring 401 has a ring structure. Multiple first limiting grooves 403 are provided on the outer side of the limiting ring 401 and the inner side of the limiting block 4 to limit the connecting member 402 on the inner side of the mounting plate 101. One end of the connecting member 402 is fixedly connected to one end of the fan blade 2. Both sides of the connecting member 402 are provided with protrusions that match the first limiting grooves 403. At the same time, the outer sides of both ends of the connecting member 402 are respectively provided with a locking head 404 and a locking groove 405. The locking head 404 can be inserted into the inner side of the locking groove 405 for connecting and limiting two adjacent connecting members 402.

[0033] Among them, an arc-shaped structure is provided on the outer side of one end of the fan blade 2, and the arc-shaped structures at the bottom of each fan blade 2 are in contact with each other, further connecting each adjacent fan blade 2 to reduce the vibration caused by wind.

[0034] In the specific implementation process: When using the device, the user can place the connector 402 inside two adjacent limiting blocks 4, and at the same time, the protrusions at both ends of the connector 402 are respectively inserted into the first limiting groove 403 opened in the limiting block 4 and the first limiting groove 403 opened in the limiting ring 401 to limit the position of the connector 402, thereby limiting the fan blade 2 on the outer side of the end of the connector 402. Through the snap-fit ​​relationship, the tendency of the fan blade 2 to move during operation is reduced, thereby reducing vibration. At the same time, each connector 402 is snapped together by the snap head 404 and the snap groove 405, and the linkage effect further limits the connector 402.

[0035] Working principle:

[0036] Based on Example 1, the multi-level limiting structure of the fixing ring 3 for the end of the fan blade 2 and the connecting ring 301 and the limiting plate 302 can effectively limit the vibration tendency of the fan blade 2 under the action of wind during operation, ensuring that its position is relatively stationary and greatly reducing the vibration amplitude. The reduction of vibration significantly reduces the frequency of friction and collision between the fan blade 2 and surrounding components and the phenomenon of stress concentration, avoiding material fatigue, wear and structural loosening caused by high-frequency vibration. Among them, the design of multiple connecting rings 301 with the size gradually decreasing towards the center can form a gradient stiffness support system, so that the fan blade 2 can obtain a precise matching constraint stiffness at different radius positions, which can reduce the vibration amplitude and avoid stress concentration caused by excessive local rigidity. At the same time, the stable position of the fan blade 2 ensures the overall dynamic balance of the impeller, reduces additional impact losses, thereby greatly improving the wear resistance of the impeller, extending its service life, reducing maintenance costs, and improving the stability and reliability of the turbine operation.

[0037] Based on Example 2, by placing the connector 402 between adjacent limiting blocks 4, and utilizing the precise engagement between its two end protrusions and the first limiting groove 403 on the limiting blocks 4 and limiting rings 401, as well as the mutual engagement between the connectors 402 through the clamping heads 404 and the clamping grooves 405, not only can the displacement of the connector 402 be effectively limited, but also the movement tendency of the fan blade 2 at high speed is significantly reduced by limiting the outer side of the end of the connector 402, reducing the friction and stress concentration caused by vibration, greatly improving the wear resistance of the fan blade 2, and extending the service life of the component. At the same time, the engagement structure between the connector 402 and the limiting blocks 4 and limiting rings 401, and the mutual engagement design between the connectors 402 through the clamping heads 404 and the clamping grooves 405, make it possible to quickly disassemble the entire impeller without complicated tools, simply by separating the clamping components in a specific order, which greatly shortens the maintenance time, reduces the difficulty of maintenance and labor costs, and achieves efficient and convenient disassembly and maintenance.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A high-pressure wear-resistant centrifugal turbine impeller, comprising a connecting shaft (1) and fan blades (2), characterized in that: Also includes: A limiting component is provided on the outside of the fan blade (2) for connecting and limiting the fan blade (2); Mounting plate (101) is fixedly disposed on the outside of the connecting shaft (1); A fixing ring (3) is fixedly disposed on the outer side of the ends of the plurality of fan blades (2); The mounting component is disposed inside the mounting plate (101); The limiting block (4) is fixedly installed on the inner side of the mounting plate (101).

2. The high-pressure wear-resistant centrifugal turbine impeller according to claim 1, characterized in that: The limiting component includes: A connecting ring (301) is fixedly disposed on the inner side of the plurality of fan blades (2) for connecting the plurality of fan blades (2); The limiting plate (302) is fixedly disposed on the inner side of the plurality of connecting rings (301).

3. The high-pressure wear-resistant centrifugal turbine impeller according to claim 1, characterized in that: The fixing ring (3) is a ring structure, and the end of the fixing ring (3) is provided with an inclined structure.

4. The high-pressure wear-resistant centrifugal turbine impeller according to claim 2, characterized in that: The dimensions of the plurality of connecting rings (301) gradually decrease.

5. The high-pressure wear-resistant centrifugal turbine impeller according to claim 1, characterized in that: The mounting component includes: A limiting ring (401) is fixedly disposed on the inner side of the mounting plate (101); A connector (402) is disposed on the inner side of the gap formed between the two limiting blocks (4) for connecting multiple fan blades (2).

6. The high-pressure wear-resistant centrifugal turbine impeller according to claim 5, characterized in that: The inner sides of the limiting ring (401) and the limiting block (4) are provided with a first limiting groove (403). The outer sides of both ends of the connector (402) are provided with protrusions. The protrusions of the connector (402) are provided inside the first limiting groove (403) for limiting the connector (402).

7. The high-pressure wear-resistant centrifugal turbine impeller according to claim 5, characterized in that: One end of the connector (402) is provided with a locking head (404) on the outer side, and the other end of the connector (402) is provided with a locking groove (405) on the inner side. Two adjacent connectors (402) are engaged by the locking head (404) and the locking groove (405) provided thereon.

8. A high-pressure wear-resistant centrifugal turbine impeller according to claim 5, characterized in that: The arc-shaped structures at the bottom of the multiple fan blades (2) are in close contact.

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