Blade angle adjusting structure for low-pressure module through-flow

Abstract

The utility model relates to a turbine technical field discloses a kind of blade angle adjusting structure for low-pressure module through-flow, including main shaft, the outside of main shaft is staggered distribution and is sequentially provided with rotor assembly, adjusting stator assembly, the adjusting stator assembly includes impeller, fixed frame, the inner wall of impeller is fixedly connected to the outer wall of main shaft, and the outer wall of fixed frame is fixedly connected to low-pressure turbine cavity inner wall.In the utility model, by two groups of adjusting stator assembly along mirror image, every group of multiple groups of equidistant distribution, combine impeller and main shaft fixed, fixed frame and turbine cavity fixed, to drive motor drive blade, cooperate with the sliding of the adjusting guide rod along the adjusting guide groove of double guide groove mirror image of double guide rod mirror image adjusting guide rod, realize the accurate angle adjustment of moving blade to realize the uniform stress of moving blade, adjustment stable no jam, improve adjustment precision, realize multi-section through-flow adjustment adaptation different working conditions, while main shaft stress balance, avoid structural deformation, improve overall operation stability.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and in particular to a blade angle adjustment structure for low-pressure module flow passage. Background Technology

[0002] A steam turbine is a rotary power machine that converts the thermal energy of steam into mechanical energy. Its core principle is to use high-temperature and high-pressure steam to impact the blades, drive the main shaft to rotate, and then drive the operation of equipment such as generators and compressors. It is a core power equipment in thermal power generation, nuclear power generation, marine power and industrial power systems.

[0003] During the operation of a steam turbine, the flow efficiency of the low-pressure module directly determines the overall energy consumption and operational stability of the equipment. As a core component of the low-pressure module, the blade angle adjustment structure's adjustment accuracy, operational stability, and flow adaptability are crucial to the steam turbine's adaptability to operating conditions.

[0004] Existing flow-through blade adjustment structures for low-pressure modules can achieve flow regulation, but they suffer from low angle adjustment accuracy, easy jamming, uneven flow, and easy stress imbalance on the main shaft, affecting operational stability. Therefore, a blade angle adjustment structure for low-pressure module flow is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a blade angle adjustment structure for low-pressure module flow passage, aiming to solve the problems of low adjustment accuracy, easy jamming, uneven flow passage, and easy stress imbalance of the main shaft in the existing low-pressure module flow passage blade adjustment structure, which in turn affects the stability of operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a blade angle adjustment structure for low-pressure module flow, comprising a main shaft, wherein a rotor assembly and an adjusting stator assembly are arranged alternately on the outer side of the main shaft;

[0007] The adjusting stator assembly includes an impeller and a fixed frame. The inner wall of the impeller is fixedly connected to the outer wall of the main shaft, and the outer wall of the fixed frame is fixedly connected to the inner wall of the low-pressure turbine cavity. An adjusting guide groove is provided on the outer wall of the fixed frame, and an installation groove is provided on the outer wall of the impeller. A drive motor is fixedly connected to the inner wall of the installation groove. A moving blade is fixedly connected to the output end of the drive motor, and an adjusting guide rod is fixedly connected to the outer end of the moving blade. The outer wall of the adjusting guide rod is slidably connected to the inner wall of the adjusting guide groove.

[0008] As a further description of the above technical solution:

[0009] The adjusting stator assembly is provided in two sets, wherein the two sets of adjusting stator assemblies are mirror images of each other along the central axis of the main shaft, and each set of adjusting stator assemblies is provided with multiple assemblies at equal intervals along the length direction of the main shaft.

[0010] As a further description of the above technical solution:

[0011] The impeller has multiple moving blades, which are distributed at equal intervals in a ring along the outer side of the impeller.

[0012] As a further description of the above technical solution:

[0013] Two adjustment guide rods are provided, and the two adjustment guide rods are mirror images of each other along the central axis of the end of the moving blade.

[0014] As a further description of the above technical solution:

[0015] The adjustment guide groove is provided in two sets, and the two sets of adjustment guide grooves are mirror images of each other along the central axis of the outer wall of the fixed frame.

[0016] As a further description of the above technical solution:

[0017] The rotor assembly includes a drum, the inner wall of which is rotatably connected to the outer wall of the main shaft, and stationary blades are fixedly connected to the outer wall of the drum.

[0018] As a further description of the above technical solution:

[0019] The stationary blades are provided in multiples, and the multiple stationary blades are distributed at equal intervals in a ring along the outer side of the drum.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, two sets of adjusting stator assemblies, each with multiple sets of equal spacing and mirrored along the main shaft, are combined with the impeller fixed to the main shaft and the fixed frame fixed to the turbine cavity. The drive motor drives the rotating blades, and the adjusting guide rods, mirrored by the double guide rods, slide along the adjusting guide grooves, mirrored by the double guide grooves. This achieves precise angle adjustment of the moving blades, resulting in uniform force on the moving blades, smooth adjustment without jamming, improved adjustment accuracy, and multi-stage flow adjustment to adapt to different working conditions. At the same time, the main shaft is subjected to balanced force, avoiding structural deformation and improving overall operational stability.

[0022] 2. In this utility model, the main shaft provides the mounting reference and rotation center for the rotor assembly. Combined with the rotational connection between the drum and the main shaft, and the multiple stationary blades evenly distributed in annular on the outer wall of the drum, the flow rate can be adjusted. The rotational connection between the drum and the main shaft reduces rotational friction loss. The evenly distributed annular stationary blades make the flow more uniform, avoid local airflow turbulence, and improve flow efficiency. At the same time, it ensures that the rotor assembly can rotate flexibly, which helps to facilitate the smooth implementation of flow rate adjustment. Furthermore, the angle coordination between the stationary and moving blades of the rotor assembly, combined with two sets of mirror images and multiple sets of evenly spaced adjusting stator assemblies on the main shaft, enables multi-stage precise flow rate adjustment. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a blade angle adjustment structure for flow passage in a low-pressure module proposed in this utility model.

[0024] Figure 2 This is a schematic diagram of the main shaft and rotor assembly structure of a blade angle adjustment structure for low-pressure module flow passage proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the regulating stator assembly structure of a blade angle adjustment structure for low-pressure module flow passage proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of the disassembled structure of the adjusting stator assembly for a low-pressure module flow-through blade angle adjustment structure proposed in this utility model.

[0027] Legend:

[0028] 1. Main shaft; 2. Rotor assembly; 21. Drum; 22. Stationary blade; 3. Adjusting stator assembly; 31. Impeller; 32. Mounting slot; 33. Drive motor; 34. Moving blade; 35. Adjusting guide rod; 36. Fixing frame; 37. Adjusting guide groove. Detailed Implementation

[0029] 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.

[0030] Reference Figure 1 and Figure 2This utility model provides an embodiment of a blade angle adjustment structure for flow passage in a low-pressure module, comprising a main shaft 1, which serves as the core support component of the entire structure, providing an installation reference and rotation center for the rotor assembly 2 and the adjusting stator assembly 3. The rotor assembly 2 is located on the outer side of the main shaft 1 and is the key moving component for flow passage adjustment, capable of rotating around the main shaft 1. The rotor assembly 2 includes a drum 21, which forms the main frame of the rotor assembly 2 and connects the main shaft 1 to the stationary blades 22. The inner wall of the drum 21 is rotatably connected to the outer wall of the main shaft 1. This connection ensures that the drum 21 can rotate flexibly relative to the main shaft 1, reducing frictional losses during rotation. Stationary blades 22 are fixedly connected to the outer wall of the drum 21, rotating synchronously with the drum 21. By changing the angle, the flow passage cross-section size is altered, thus adjusting the flow rate. Multiple stationary blades 22 are arranged in a ring-shaped, equally spaced configuration along the outer side of the drum 21. This ring-shaped, equally spaced distribution makes the flow more uniform, avoids local airflow turbulence, and improves flow efficiency.

[0031] Reference Figure 1 , Figure 3 and Figure 4An adjusting stator assembly 3 is provided on the outer side of the main shaft 1. The adjusting stator assembly 3 serves as a fixed adjusting component, cooperating with the rotor assembly 2 to achieve precise control of the blade angle. There are two sets of adjusting stator assemblies 3, which are mirror images of each other along the central axis of the main shaft 1. This mirror image arrangement ensures balanced force on the main shaft 1, avoiding structural deformation caused by unilateral force and improving overall stability. Furthermore, multiple adjusting stator assemblies 3 are evenly distributed along the length of the main shaft 1. This multi-set distribution along the length allows for multi-stage flow adjustment, meeting flow requirements under different operating conditions. The adjusting stator assembly 3 includes an impeller 31 and a fixed frame 36. The impeller 31 is the motion actuator of the adjusting stator assembly 3, and the fixed frame 36 is... The fixed support frame of this component has the inner wall of the impeller 31 fixedly connected to the outer wall of the main shaft 1. This fixed connection keeps the impeller 31 relatively stationary with the main shaft 1, providing a stable mounting base for the drive motor 33. The outer wall of the fixed frame 36 is fixedly connected to the inner wall of the low-pressure turbine cavity. By fixing it to the inner wall of the turbine cavity, the adjusting stator assembly 3 is kept fixed as a whole, providing a reference for the adjustment of the moving blade 34. The outer wall of the fixed frame 36 has an adjusting guide groove 37, which provides a guide trajectory for the adjusting guide rod 35 and limits the rotation angle range of the moving blade 34. The outer wall of the impeller 31 has a mounting groove 32, which provides a dedicated mounting space for the drive motor 33, ensuring that the drive motor 33 is firmly installed. Without interfering with other components, a drive motor 33 is fixedly connected to the inner wall of the mounting groove 32. The drive motor 33 is the power source for adjusting the angle of the moving blade 34, providing stable power for the rotation of the moving blade 34. The output end of the drive motor 33 is fixedly connected to the moving blade 34. The drive motor 33 drives the moving blade 34 to rotate around the output end, directly realizing the adjustment of the angle of the moving blade 34. There are multiple moving blades 34, and the multiple moving blades 34 are evenly distributed in a ring along the outer side of the impeller 31. The evenly distributed ring ensures that the moving blades 34 are subjected to uniform force, and the airflow changes smoothly during adjustment, improving the adjustment accuracy. An adjustment guide rod 35 is fixedly connected to the outer end of the moving blade 34. The adjustment guide rod 35 connects the moving blade 34 and the adjustment guide groove 37, allowing the moving blade 34 to rotate. The rotational motion of the moving blade 34 is converted into sliding motion along the guide groove. There are two adjusting guide rods 35, and the two adjusting guide rods 35 are mirror images of each other along the central axis of the end of the moving blade 34. The mirror image arrangement of the two guide rods balances the force on the end of the moving blade 34, preventing the moving blade 34 from shifting or getting stuck during the adjustment process. The outer wall of the adjusting guide rod 35 is slidably connected to the inner wall of the adjusting guide groove 37. The sliding connection ensures that the adjusting guide rod 35 can move smoothly along the guide groove, providing precise guidance for the angle adjustment of the moving blade 34. There are two sets of adjusting guide grooves 37, and the two sets of adjusting guide grooves 37 are mirror images of each other along the central axis of the outer wall of the fixed frame 36. The two sets of guide grooves cooperate with the two guide rods to further improve the stability and accuracy of the adjustment of the moving blade 34.

[0032] Working principle: During the operation of the low-pressure steam turbine, the main shaft 1, as the core support component, drives the impeller 31 of the adjusting stator assembly 3, which is fixedly connected to its inner wall, to rotate synchronously. At this time, the drive motor 33 of the adjusting stator assembly 3 starts, and its output end drives the moving blade 34 to rotate. The adjusting guide rod 35 at the outer end of the moving blade 34 slides along the adjusting guide groove 37 fixed to the outer wall of the fixing frame 36 in the inner wall of the low-pressure turbine cavity. The adjusting guide groove 37 not only limits the rotation angle range of the moving blade 34, but also ensures that the adjustment process of the moving blade 34 is smooth and without jamming, so that the moving blade 34 is accurately adjusted to the angle suitable for the working conditions.

[0033] Meanwhile, in the rotor assembly 2 outside the main shaft 1, the drum 21 rotates flexibly around the main shaft 1, and the stationary blades 22 distributed at equal intervals on its outer wall rotate synchronously with the drum 21. When the airflow enters the flow passage of the low-pressure steam turbine, it is first guided by the moving blades 34 of the adjusting stator assembly 3, which have been adjusted to control the initial flow cross section, and then flows through the stationary blades 22 of the rotor assembly 2. The angles of the stationary blades 22 and the moving blades 34 are matched to dynamically change the actual cross-sectional size of the flow passage. Combined with the two sets of mirror distribution and multiple sets of equally spaced adjusting stator assemblies 3 on the main shaft 1, multi-stage precise flow rate adjustment is achieved, which not only ensures the uniformity of the flow and avoids airflow turbulence, but also adapts to different working conditions. At the same time, the main shaft 1 is subjected to balanced force, which improves the overall structural stability.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blade angle adjustment structure for low-pressure module current flow, comprising a main shaft (1), characterized in that: The rotor assembly (2) and the adjusting stator assembly (3) are arranged alternately on the outer side of the main shaft (1); The adjusting stator assembly (3) includes an impeller (31) and a fixed frame (36). The inner wall of the impeller (31) is fixedly connected to the outer wall of the main shaft (1). The outer wall of the fixed frame (36) is fixedly connected to the inner wall of the low-pressure turbine cavity. An adjusting guide groove (37) is provided on the outer wall of the fixed frame (36). An installation groove (32) is provided on the outer wall of the impeller (31). A drive motor (33) is fixedly connected to the inner wall of the installation groove (32). A moving blade (34) is fixedly connected to the output end of the drive motor (33). An adjusting guide rod (35) is fixedly connected to the outer end of the moving blade (34). The outer wall of the adjusting guide rod (35) is slidably connected to the inner wall of the adjusting guide groove (37).

2. The blade angle adjustment structure for low-voltage module current flow according to claim 1, characterized in that: The adjusting stator assembly (3) is provided in two groups, wherein the two groups of adjusting stator assemblies (3) are mirror images of each other along the central axis of the main shaft (1), and each group of adjusting stator assemblies (3) is provided with multiple units at equal intervals along the length direction of the main shaft (1).

3. The blade angle adjustment structure for low-voltage module current flow according to claim 1, characterized in that: The moving blades (34) are provided in multiple ways, and the multiple moving blades (34) are distributed at equal intervals in a ring along the outer side of the impeller (31).

4. The blade angle adjustment structure for low-voltage module current flow according to claim 1, characterized in that: Two adjustment guide rods (35) are provided, and the two adjustment guide rods (35) are mirror images of each other along the central axis of the end of the moving blade (34).

5. The blade angle adjustment structure for low-voltage module current flow according to claim 1, characterized in that: The adjustment guide groove (37) is provided in two sets, and the two sets of adjustment guide grooves (37) are mirrored along the central axis of the outer wall of the fixed frame (36).

6. The blade angle adjustment structure for low-voltage module current flow according to claim 1, characterized in that: The rotor assembly (2) includes a drum (21), the inner wall of which is rotatably connected to the outer wall of the main shaft (1), and stationary blades (22) are fixedly connected to the outer wall of the drum (21).

7. The blade angle adjustment structure for low-voltage module current flow according to claim 6, characterized in that: The stationary blades (22) are provided in multiple ways, and the multiple stationary blades (22) are distributed at equal intervals in a ring along the outer side of the drum (21).

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