Digital display type measuring tool for air gap of turbine generator stator and rotor
Patent Information
- Application Number
- CN202522091903.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-09-28
AI Technical Summary
[0004]本实用新型所要解决的技术问题是提供一种汽轮发电机定转子气隙数显式测量工具，本测量工具克服传统测量作业的缺陷，测量操作便捷、测量数据直观，提高测量作业效率和测量精度，确保定转子气隙符合要求
[0010]由于本实用新型汽轮发电机定转子气隙数显式测量工具采用了上述技术方案，即本工具的中空管前端连接壳体并底面齐平、后端设有封板，壳体顶面开有圆孔，圆柱测量块设于壳体内，并且顶端可伸出壳体顶面圆孔、底端设有斜面，圆柱测量块底端的斜面上方设有止口，弹簧套入圆柱测量块并且两端分别抵靠至壳体顶面和止口，测量头设于圆柱测量块顶端，圆形滑块设于壳体内并且抵靠至圆柱测量块底端斜面，测量螺杆位于中空管内并且前端连接圆形滑块、后端连接摇柄，测量螺杆与中空管后端封板通过螺纹连接，中空管底面沿长度方向开有滑槽，滑轨式基准块设于中空管底面并沿滑槽移动，激光十字光标灯和数显式位移尺分别设于中空管顶面和侧面，并且十字光标与壳体的中心线重合，数显式位移尺检测测量螺杆的位移量。本测量工具克服传统测量作业的缺陷，测量操作便捷、测量数据直观，提高测量作业效率和测量精度，确保定转子气隙符合要求。
Smart Images
Figure CN224815634U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment maintenance technology, and in particular to a digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator. Background Technology
[0002] The air gap between the stator and rotor of a steam turbine generator is a critical parameter during generator maintenance, directly affecting generator performance and operational reliability. To ensure the generator rotor can operate normally within the stator cavity, a certain air gap must be maintained between the rotor poles and the stator core; its size depends on the generator's structure and capacity. Therefore, the air gap between the generator stator and rotor must be measured before and after each generator set maintenance. The standard for judging the generator stator and rotor air gap is to measure four values on each of the generator's steam / excitation sides (up, down, left, and right), and then calculate the deviation value. If the deviation value significantly exceeds the standard, the stator needs to be adjusted to ensure the safe operation of the unit.
[0003] In practical measurements, two methods are generally used. The first is to use a wooden wedge ruler made according to the generator's air gap size. During measurement, paint is applied to the bevel of the ruler, and it is inserted into the stator core with the bevel facing down. When it stops moving, the ruler is pulled out, and the thickness of the scratched area on the ruler is measured with vernier calipers; this is the air gap at that point. However, this method has drawbacks because the actual measurement point is the distance between the rotor surface and the stator core. Since both ends of the generator rotor have protective rings that extend above the rotor surface, in actual measurement, the measuring personnel may not have enough strength to insert the ruler properly, or the ruler may break inside the gap, making the measurement difficult. The second method uses a measuring rod. The air gap is measured by adjusting the screw height inside the nut at the end of the measuring rod. When the height is adjusted to a tight fit during insertion, this height is measured with vernier calipers; this is the air gap at that point. This method requires multiple adjustments of the screw height and lacks an axial distance reference, making it impossible to ensure that the measuring point is in the same axial position, greatly increasing measurement errors. Moreover, the insertion contact force depends on the subjective feeling of the measuring personnel, resulting in low efficiency and large errors. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide a digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator. This measuring tool overcomes the defects of traditional measuring operations, is convenient to operate, provides intuitive measurement data, improves the efficiency and accuracy of measuring operations, and ensures that the air gap between the stator and rotor meets the requirements.
[0005] To solve the above-mentioned technical problems, this utility model provides a digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator, comprising a housing, a circular slider, a cylindrical measuring block, a measuring head, a spring, a hollow tube, a measuring screw, a crank handle, a slide rail type reference block, a laser crosshair indicator, and a digital displacement gauge. The hollow tube is connected to the housing at its front end and flush with its bottom surface, and has a sealing plate at its rear end. A circular hole is formed on the top surface of the housing. The cylindrical measuring block is housed within the housing, with its top end extending beyond the circular hole on the top surface of the housing and its bottom end having an inclined surface. A stop is provided above the inclined surface at the bottom end of the cylindrical measuring block. The spring is fitted into the cylindrical measuring block, with both ends abutting against the top surface of the housing and the stop, respectively. The measuring head is located at the top of the cylindrical measuring block. The circular slider is located inside the housing and abuts against the bottom inclined surface of the cylindrical measuring block. The measuring screw is located inside the hollow tube and is connected to the circular slider at the front end and to the crank handle at the rear end. The measuring screw is threadedly connected to the rear end sealing plate of the hollow tube. A groove is opened along the length direction on the bottom surface of the hollow tube. The slide rail reference block is located on the bottom surface of the hollow tube and moves along the groove. The laser crosshair and the digital displacement gauge are respectively located on the top and side surfaces of the hollow tube. The crosshair of the laser crosshair coincides with the center line of the housing after the laser crosshair is turned on. The digital displacement gauge detects the displacement of the measuring screw.
[0006] Furthermore, the bottom inclined surface of the cylindrical measuring block is at a 45-degree angle, and the outer circle of the circular slider is tangent to the bottom inclined surface of the cylindrical measuring block.
[0007] Furthermore, the circular slider is connected to the measuring screw via a thread.
[0008] Furthermore, the length of the groove on the bottom surface of the hollow tube is 500mm.
[0009] Furthermore, the cylindrical measuring block is connected to the measuring head via a slot and a rod.
[0010] Because this utility model of a digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator adopts the above-mentioned technical solution, namely, the front end of the hollow tube of this tool is connected to the shell and the bottom surface is flush with it, and the rear end is provided with a sealing plate. A circular hole is opened on the top surface of the shell, a cylindrical measuring block is set inside the shell, and the top end can extend out of the circular hole on the top surface of the shell. A slope is provided at the bottom end of the cylindrical measuring block, and a stop is provided above the slope at the bottom end of the cylindrical measuring block. A spring is fitted into the cylindrical measuring block and its two ends abut against the top surface of the shell and the stop, respectively. The measuring head is set at the top of the cylindrical measuring block, a circular slider is set inside the shell and abuts against the slope at the bottom end of the cylindrical measuring block, the measuring screw is located inside the hollow tube and the front end is connected to the circular slider and the rear end is connected to the crank handle. The measuring screw is connected to the sealing plate at the rear end of the hollow tube by a thread. A groove is opened on the bottom surface of the hollow tube along the length direction. A slide rail reference block is set on the bottom surface of the hollow tube and moves along the groove. A laser crosshair and a digital displacement gauge are respectively set on the top and side surfaces of the hollow tube, and the crosshair coincides with the center line of the shell. The digital displacement gauge detects the displacement of the measuring screw. This measuring tool overcomes the shortcomings of traditional measuring operations, providing convenient operation and intuitive measurement data, thereby improving measurement efficiency and accuracy and ensuring that the air gap between the stator and rotor meets the requirements. Attached Figure Description
[0011] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator according to this utility model; Figure 2 for Figure 1 Top view. Detailed Implementation
[0012] Implementation, for example Figure 1 and Figure 2As shown, this utility model of a digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator includes a housing 1, a circular slider 2, a cylindrical measuring block 3, a measuring head 4, a spring 5, a hollow tube 6, a measuring screw 7, a crank handle 8, a slide rail type reference block 9, a laser crosshair indicator light 10, and a digital displacement gauge 11. The front end of the hollow tube 6 is connected to the housing 1 and its bottom surface is flush with the housing 1, while the rear end is provided with a sealing plate 61. A circular hole 10 is opened on the top surface of the housing 1. The cylindrical measuring block 3 is located inside the housing 1, and its top end can extend out of the circular hole 10 on the top surface of the housing 1. A slope 31 is provided at the bottom end of the cylindrical measuring block 3, and a stop 32 is provided above the slope 31 at the bottom end of the cylindrical measuring block 3. The spring 5 is fitted into the cylindrical measuring block 3, and its two ends abut against the top surface of the housing 1 and the stop 32, respectively. The measuring head 4 is located at the top of the cylindrical measuring block 3. The circular slider 2 is located inside the housing 1 and abuts against the bottom inclined surface 31 of the cylindrical measuring block 3. The measuring screw 7 is located inside the hollow tube 6 and is connected to the circular slider 2 at the front end and to the crank handle 8 at the rear end. The measuring screw 7 is threadedly connected to the rear end sealing plate 61 of the hollow tube 6. The bottom surface of the hollow tube 6 has a groove along its length. The slide rail reference block 9 is located on the bottom surface of the hollow tube 6 and moves along the groove. The laser crosshair light 10 and the digital displacement ruler 11 are respectively located on the top surface and side surface of the hollow tube 6. The crosshair of the laser crosshair light 10 coincides with the center line of the housing 1 after it is turned on. The digital displacement ruler 11 detects the displacement of the measuring screw 7.
[0013] Preferably, the bottom inclined surface 31 of the cylindrical measuring block 3 has a 45-degree angle, and the outer circle of the circular slider 2 is tangent to the bottom inclined surface 31 of the cylindrical measuring block 3.
[0014] Preferably, the circular slider 2 is connected to the measuring screw 7 by a thread.
[0015] Preferably, the length of the groove on the bottom surface of the hollow tube 6 is 500mm.
[0016] Preferably, the cylindrical measuring block 3 and the measuring head 4 are connected by a slot and a plug.
[0017] Because of the small air gap of the generator, the laser crosshair indicator light of this tool changes the past practice of relying entirely on visual inspection to determine whether the measuring head is horizontal or vertical. During measurement, the measuring head is very prone to tilting, increasing measurement errors. The laser crosshair indicator light provides horizontal and vertical crosshair reference lines, thereby reducing measurement errors and improving measurement accuracy.
[0018] A miniature bearing is installed at the moving grid position of the digital displacement scale head on the outer diameter of the measuring screw inside the hollow tube. The outer circle of the miniature bearing is connected to the moving grid of the digital displacement scale head. By rotating the crank, the moving grid of the digital displacement scale head is axially displaced, thereby measuring the displacement of the measuring screw. Since the measuring head is tangent to the circular slider at a 45-degree angle, the axial displacement of the scale head (the displacement of the measuring screw) is the displacement of the measuring head.
[0019] This tool utilizes the engagement of a circular slider with the inclined surface at the bottom of a cylindrical measuring block to ensure that the axial displacement of the measuring screw is equivalent to the longitudinal displacement of the cylindrical measuring block. A digital displacement gauge detects and displays the displacement of the cylindrical measuring block in real time, thus obtaining the desired measurement value. The measuring head can be manufactured with different heights to accommodate varying stator-rotor clearances and can be selectively positioned on the top surface of the cylindrical measuring block.
[0020] During the actual measurement of the air gap between the stator and rotor, firstly, select the appropriate measuring head and cylindrical measuring block according to the actual air gap between the generator stator and rotor, and assemble them through slots and inserts; adjust the sliding rail reference ruler to a suitable distance using the generator rotor retaining ring as a reference; then calibrate the cylindrical measuring block, measuring head, and digital displacement ruler to zero position by rotating the measuring screw with a crank handle, i.e., align the top surface of the cylindrical measuring block with the top surface of the housing; then turn on the laser crosshair indicator switch to calibrate the crosshair to coincide with the center line of the housing; finally, insert the housing into the generator chamber through the hollow tube, and place the sliding rail reference ruler against the generator... At the end of the rotor retaining ring, the bottom of the housing is brought into close contact with the rotor surface. Using the crosshair of the laser crosshair light as a reference, ensure that the crosshair is horizontal or perpendicular to the generator stator and rotor during measurement to reduce measurement error. Rotate the crank to rotate the measuring screw, causing the circular slider to push the cylindrical measuring block, which in turn drives the measuring head into close contact with the generator stator core. Read and record the displacement of the measuring screw detected by the digital displacement scale. Finally, calculate the air gap value here, that is, the fixed height value of the housing + the displacement of the measuring screw + the fixed height value of the measuring head = the air gap value of the generator stator and rotor.
[0021] This measuring tool not only provides convenience for measuring the air gap between the stator and rotor of steam turbine generators, but also improves the efficiency and accuracy of the measurement work, ensuring that the air gap between the stator and rotor meets the requirements.
Claims
1. A digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator, characterized in that: The device includes a housing, a circular slider, a cylindrical measuring block, a measuring head, a spring, a hollow tube, a measuring screw, a crank, a slide rail reference block, a laser crosshair indicator, and a digital displacement gauge. The hollow tube is connected to the housing at its front end and flush with its bottom surface, with a sealing plate at its rear end. A circular hole is formed on the top surface of the housing. The cylindrical measuring block is housed within the housing, with its top end extending beyond the circular hole on the top surface of the housing and its bottom end having a bevel. A stop is provided above the bevel at the bottom end of the cylindrical measuring block. The spring is fitted into the cylindrical measuring block, with both ends abutting against the top surface of the housing and the stop, respectively. The measuring head is located at the top of the cylindrical measuring block. A circular slider is located inside the housing and abuts against the inclined surface at the bottom of the cylindrical measuring block. The measuring screw is located inside the hollow tube and is connected to the circular slider at its front end and to a crank handle at its rear end. The measuring screw is threadedly connected to the rear end sealing plate of the hollow tube. A groove is formed on the bottom surface of the hollow tube along its length. The slide rail reference block is located on the bottom surface of the hollow tube and moves along the groove. A laser crosshair and a digital displacement gauge are respectively located on the top and side surfaces of the hollow tube. When the laser crosshair is turned on, the crosshair coincides with the center line of the housing. The digital displacement gauge detects the displacement of the measuring screw.
2. The digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator according to claim 1, characterized in that: The bottom inclined surface of the cylindrical measuring block is at a 45-degree angle, and the outer circle of the circular slider is tangent to the bottom inclined surface of the cylindrical measuring block.
3. The digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator according to claim 1 or 2, characterized in that: The circular slider is connected to the measuring screw via a thread.
4. The digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator according to claim 3, characterized in that: The length of the groove on the bottom surface of the hollow tube is 500mm.
5. The digital display measuring tool for the air gap between the stator and rotor of a steam turbine generator according to claim 3, characterized in that: The cylindrical measuring block is connected to the measuring head via a slot and a rod.