Thermal power steam turbine general assembly through-flow measurement method

Abstract

The invention discloses a thermal power steam turbine general assembly through-flow measurement method. Relates to the field of thermal power generation turbosets. At present, the problem that the installation progress of a power plant is affected due to the fact that an existing rotor manufacturing period and a stator assembly manufacturing period are not matched due to a final assembly assembly period is solved. A high-precision numerical control vertical lathe is used for machining the steam turbine stator part sleeve gland sealing teeth, the concentricity requirement of the through-flow position of the stator part sleeve is met, machining diameter data phi A are measured, during final assembly of a steam turbine, the center of the stator part sleeve is adjusted, a dummy shaft tool is used for measuring the gland sealing tooth center value, the up-down deviation omega and the left-right deviation delta, and the upper half part of the stator part sleeve is combined. The diameter phi A of the gland plate is measured again, and it is guaranteed that the deviation between the diameter phi A and the machining deviation is within 0.10 mm; machining the rotor by using a numerical control horizontal lathe, ensuring the concentricity of the shroud ring and the body position, and measuring the machining diameter phi B; and radial through-flow clearance calculation and gland sealing tooth repair are carried out to replace an original rotor in-place actual through-flow clearance measurement method, so that the production efficiency is improved. The method is applied to the field of turbine assembly measurement.

Description

Technical Field

[0001] The invention relates to the field of thermal power generation steam turbine units, and in particular to a method for measuring the flow through an assembly of a thermal power steam turbine. Background Art

[0002] At present, the main engine of thermal power generation steam turbine units is mostly pre-assembled in the factory, and the flow clearance between the rotor and the stator is inspected and repaired to improve the accuracy of on-site installation and reduce quality risks. In recent years, the competition in the thermal power market has intensified, and the project delivery period has become increasingly tight. The time from contract signing to project delivery has been continuously compressed. At the same time, some owners require the use of imported forgings for the rotor. Affected by international unstable factors, the production and manufacturing cycle is longer. According to industry experience,

[0003] The rotor is usually complex in shape and requires extremely high precision. The turbine rotor has structures such as impellers and blades. During the processing, it needs to go through multiple processes, including turning, milling, grinding, etc., and special processes such as dynamic balancing tests are also required to ensure the stability and safety of the rotor when it rotates at high speed. These complex processes make the rotor processing time longer, which will extend the rotor manufacturing cycle. The stator sleeve is relatively simple in structure and has relatively few processing processes. At the same time, the materials used in the stator sleeve are relatively common, the market supply is relatively sufficient, and the procurement cycle is short. In addition, the pretreatment requirements of the stator material are relatively low, and it does not require complex processing like the rotor material. Therefore, the rotor production and manufacturing cycle differs from the stator sleeve production and manufacturing cycle by more than 3 months, resulting in a mismatch in the assembly cycle, affecting the installation progress of the power plant, and causing the power plant to be unable to be put into production on schedule. Summary of the invention

[0004] In order to solve the problem that the existing rotor manufacturing cycle and the stator sleeve manufacturing cycle do not match the assembly sleeve cycle, which affects the installation progress of the power plant, the present invention provides a thermal power steam turbine assembly flow measurement method.

[0005] The technical solution of the present invention is:

[0006] A method for measuring flow through an assembly of a thermal power steam turbine, the method comprising the following steps:

[0007] Step 1: Processing of steam seal teeth of the stator sleeve of the steam turbine:

[0008] Use high-precision CNC vertical lathe to process the steam seal teeth of the stator sleeve of the steam turbine.

[0009] Ensure the concentricity requirements of the flow position of the stator sleeve, connect the stator sleeve and the rotor of the steam turbine, and measure the machining diameter between the stator sleeve and the rotor of the steam turbine. The diameter data is ΦA;

[0010] Step 2: Measurement of the center of the turbine stator sleeve:

[0011] During the general assembly of the steam turbine, the stator sleeve of the steam turbine is assembled and centered in the general assembly workshop, the concentricity of each sleeve is measured, and the center value of the steam seal tooth is measured using a dummy shaft tool. The steam seal tooth is measured at the ΦA position, where the upper and lower deviations are ω and the left and right deviations are δ;

[0012] Step 3: Merge the stator housing of the steam turbine:

[0013] Use the lifting equipment to lift the stator cover that needs to be combined, move the lifted stator cover to the top of the lower part, make preliminary docking, and tighten the center face bolts;

[0014] Step 31: Adjustment of the stator sleeve of the steam turbine:

[0015] Use a jack or other axial adjustment tools to axially adjust the stator sleeve and measure the axial clearance;

[0016] Step 32: Retest the steam seal:

[0017] After merging the upper half of the stator sleeve, re-measure the diameter ΦA of the steam seal to ensure that the deviation from the machining is within 0.10mm;

[0018] Step 33: Deviation verification:

[0019] Measure the diameter of the steam seal teeth at the flow-through position, compare it with the processing data, and verify the deviation;

[0020] Step 4: Rotor processing:

[0021] Use CNC horizontal lathe to process the rotor, ensure the concentricity of the shroud and the body, and measure the processing diameter ΦB;

[0022] Step 5: Calculation of radial flow clearance and repair of steam seal teeth:

[0023] Calculate radial flow clearance and repair steam seal teeth, radial clearance j 左、 j 右、 j 天 and j 地 , based on which the left, right, top and ground radial clearances of all levels are calculated and compared with the design requirements;

[0024] Process those that are out of tolerance and repeat steps 2 to 5 until the radial flow size is qualified.

[0025] Further, according to the j described in step 5 左 =(ΦA-ΦB) / 2+δ;

[0026] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0027] ΦB---Rotor flow position diameter size;

[0028] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0029] j 左 --- Radial left clearance value between turbine rotor and stator sleeve;

[0030] Further, according to the j described in step 5 右 =(ΦA-ΦB) / 2-δ;

[0031] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0032] ΦB---Rotor flow position diameter size;

[0033] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0034] j 右 --- Radial right clearance value between turbine rotor and stator sleeve;

[0035] Further, according to the j described in step 5 天 =(ΦA-ΦB) / 2+δ;

[0036] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0037] ΦB---Rotor flow position diameter size;

[0038] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0039] j 天 --- Radial clearance value between turbine rotor and stator sleeve;

[0040] Further, according to the j described in step 5 地 (ΦA-ΦB) / 2-ω;

[0041] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0042] ΦB---Rotor flow position diameter size;

[0043] ω---Using the false shaft fixture to measure the upper and lower deviations of the stator sleeve, the lower eccentricity is positive and the upper eccentricity is negative;

[0044] j 地 --- Radial clearance value between turbine rotor and stator sleeve;

[0045] Further, ΦA is the diameter size of the stator sleeve at the flow position or ΦA is the diameter size of the steam seal;

[0046] Furthermore, the stator sleeve of the steam turbine is an inner cylinder or a partition sleeve or a partition.

[0047] Further, according to step 1, a high-precision CNC vertical lathe is used to process the steam seal teeth of the stator sleeve of the steam turbine;

[0048] Step 1: Clamping and positioning:

[0049] Fix the steam seal tooth blank by a fixture. The fixture should ensure the stability of the steam seal tooth during processing, and the positioning surface of the fixture should be closely fitted with the key reference surface of the steam seal tooth.

[0050] Step 1 and 2: Alignment of the blank:

[0051] Use tools such as dial indicators to align the blank to ensure that the axis of the steam seal tooth coincides with the axis of the machine tool spindle, so that the machining allowance is evenly distributed and the error is controlled within a very small range;

[0052] Step 13: Steam seal tooth detection:

[0053] Use measuring tools to measure the size of steam seal teeth in real time;

[0054] Step 14: Surface preparation and cleaning:

[0055] According to the working environment and requirements of the steam turbine, the steam seal teeth are appropriately treated with surface anti-rust and wear-resistant coating.

[0056] Further, according to the step 2, the center value of the steam seal tooth is measured using the dummy shaft tool:

[0057] Step 21: Determine the measurement point;

[0058] Select multiple measuring points evenly in the circumferential direction of the steam seal teeth, generally no less than 8 points, to ensure that the center position of the steam seal teeth can be fully reflected;

[0059] Step 22: Measure the radial clearance:

[0060] Use an inside micrometer or other suitable measuring tool to measure the radial clearance between the steam seal tooth and the dummy shaft at each measuring point, record the radial clearance value at each measuring point, and calculate its average value as a preliminary reference for the radial center value;

[0061] Step 23: Measure the axial clearance

[0062] Use a feeler gauge or micrometer to measure the gap between the steam seal tooth and the end of the dummy shaft or a specific reference surface in the axial direction. Perform multiple measurements at different axial positions, record the measurement results, and calculate the axial center value.

[0063] Compared with the prior art, the present invention has the following effects:

[0064] 1. The present invention uses a high-precision CNC vertical lathe to process the steam seal teeth of the stator sleeve (such as the inner cylinder, partition sleeve, partition, etc.) of the steam turbine to ensure the concentricity requirements of the stator sleeve flow position, measure the processing diameter data ΦA, and adjust the center of the stator sleeve during the final assembly of the steam turbine. Use a dummy shaft tool to measure the center value of the steam seal teeth (ΦA position), the upper and lower deviations ω, the left and right deviations δ, merge the upper half of the stator sleeve, re-measure the steam seal piece diameter ΦA, and ensure that the deviation with the machining is within 0.10mm; use a CNC horizontal lathe to process the rotor to ensure the concentricity of the shroud and the body position, and measure the processing diameter ΦB; perform radial flow clearance calculation and steam seal tooth repair, radial clearance j 左、 j 右、 j 天 and j 地 Based on this, the left, right, top and ground radial clearances of all levels are calculated and compared with the design requirements. Those that exceed the tolerance are processed until they are qualified.

[0065] 2. The present invention can greatly improve the efficiency of thermal power steam turbine assembly, modularize the steam turbine assembly process, digitize the flow measurement, and simplify the production organization. It can closely combine the factory assembly with the power plant installation, match the power plant installation requirements to the maximum extent, provide the power plant in modules, optimize the production organization model, avoid repeated operations between the factory and the site, and shorten the delivery cycle.

[0066] 3. The present invention changes the traditional flow measurement method of the steam turbine by innovating the assembly process of the thermal power steam turbine, and indirectly measures the radial flow of the sleeve through various means such as processing process control, dummy shaft replacement, and innovative calculation methods, thereby replacing the traditional method of measuring the flow clearance of the rotor in place and improving production efficiency.

[0067] 4. According to the actual situation of the production and manufacturing cycle of the sleeve, the present invention adopts a new measurement method to replace the flow clearance measurement, and uses assembly dummy shafts and other tooling to achieve the measurement and calculation of the flow clearance, thereby ensuring the assembly quality and solving the problem of lengthened production cycle caused by rotor lag in thermal power projects.

[0068] 5. The present invention forms a complete rotor-free radial flow measurement solution, and through the implementation of several projects, verifies the feasibility of the solution, ensures the flow quality, and reduces the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1It is a schematic diagram of the position structure of the stator sleeve and the rotor of the steam turbine of the present invention;

[0070] Figure 2 This is a schematic diagram of radial clearance calculation.

[0071] In the figure: 1. Stator casing of steam turbine, 2. Rotor. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0073] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described as follows. A method for measuring flow through a thermal power steam turbine assembly in the present embodiment comprises the following steps:

[0074] Step 1: Processing of steam seal teeth of the stator sleeve of the steam turbine:

[0075] Use high-precision CNC vertical lathe to process the steam seal teeth of the stator sleeve of the steam turbine.

[0076] Ensure the concentricity requirements of the flow position of the stator sleeve, connect the stator sleeve and the rotor of the steam turbine, and measure the machining diameter between the stator sleeve and the rotor of the steam turbine. The diameter data is ΦA;

[0077] Step 2: Measurement of the center of the turbine stator sleeve:

[0078] During the general assembly of the steam turbine, the stator sleeve of the steam turbine is assembled and centered in the general assembly workshop, the concentricity of each sleeve is measured, and the center value of the steam seal tooth is measured using a dummy shaft tool. The steam seal tooth is measured at the ΦA position, where the upper and lower deviations are ω and the left and right deviations are δ;

[0079] Step 3: Merge the stator housing of the steam turbine:

[0080] Use the lifting equipment to lift the stator cover that needs to be combined, move the lifted stator cover to the top of the lower part, make preliminary docking, and tighten the center face bolts;

[0081] Step 31: Adjustment of the stator sleeve of the steam turbine:

[0082] Use a jack or other axial adjustment tools to axially adjust the stator sleeve and measure the axial clearance;

[0083] Step 32: Retest the steam seal:

[0084] After merging the upper half of the stator sleeve, re-measure the diameter ΦA of the steam seal to ensure that the deviation from the machining is within 0.10mm;

[0085] Step 33: Deviation verification:

[0086] Measure the diameter of the steam seal teeth at the flow-through position, compare it with the processing data, and verify the deviation;

[0087] Step 4: Rotor processing:

[0088] Use CNC horizontal lathe to process the rotor, ensure the concentricity of the shroud and the body, and measure the processing diameter ΦB;

[0089] Step 5: Calculation of radial flow clearance and repair of steam seal teeth:

[0090] Calculate radial flow clearance and repair steam seal teeth, radial clearance j 左、 j 右、 j 天 and j 地 , based on which the left, right, top and ground radial clearances of all levels are calculated and compared with the design requirements;

[0091] Process those that are out of tolerance and repeat steps 2 to 5 until the radial flow size is qualified.

[0092] Specific implementation method 2: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to the j in step five, 左 =(ΦA-ΦB) / 2+δ;

[0093] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0094] ΦB---Rotor flow position diameter size;

[0095] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0096] j 左 --- Radial left clearance value between turbine rotor and stator sleeve;

[0097] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to the j in step five, 右 =(ΦA-ΦB) / 2-δ;

[0098] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0099] ΦB---Rotor flow position diameter size;

[0100] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0101] j 右 --- Radial right clearance value between turbine rotor and stator sleeve;

[0102] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to the j in step five, 天 =(ΦA-ΦB) / 2+δ;

[0103] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0104] ΦB---Rotor flow position diameter size;

[0105] δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative;

[0106] j 天 --- Radial clearance value between turbine rotor and stator sleeve;

[0107] Specific implementation method five: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to the j in step five, 地 (ΦA-ΦB) / 2-ω;

[0108] Among them, ΦA---the diameter of the stator sleeve at the flow position;

[0109] ΦB---Rotor flow position diameter size;

[0110] ω---Using the false shaft fixture to measure the upper and lower deviations of the stator sleeve, the lower eccentricity is positive and the upper eccentricity is negative;

[0111] j 地 --- Radial clearance value between turbine rotor and stator sleeve;

[0112] Specific implementation method six: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through the assembly of a thermal power steam turbine. ΦA is the diameter size of the flow through position of the stator sleeve or ΦA is the diameter size of the steam seal piece.

[0113] Specific implementation method seven: Combination Figure 1 and Figure 2 The present embodiment is described. The present embodiment is a method for measuring flow through an assembled thermal power steam turbine. The stator sleeve of the steam turbine is an inner cylinder or a partition sleeve or a partition.

[0114] Specific implementation method eight: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to step 1, a high-precision CNC vertical lathe is used to process the steam seal teeth of the stator sleeve of the steam turbine;

[0115] Step 1: Clamping and positioning:

[0116] Fix the steam seal tooth blank by a fixture. The fixture should ensure the stability of the steam seal tooth during processing, and the positioning surface of the fixture should be closely fitted with the key reference surface of the steam seal tooth.

[0117] Step 1 and 2: Alignment of the blank:

[0118] Use tools such as dial indicators to align the blank to ensure that the axis of the steam seal tooth coincides with the axis of the machine tool spindle, so that the machining allowance is evenly distributed and the error is controlled within a very small range;

[0119] Step 13: Steam seal tooth detection:

[0120] Use measuring tools to measure the size of steam seal teeth in real time;

[0121] Step 14: Surface preparation and cleaning:

[0122] According to the working environment and requirements of the steam turbine, the steam seal teeth are appropriately treated with surface anti-rust and wear-resistant coating.

[0123] Specific implementation method nine: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a method for measuring the flow through a thermal power steam turbine assembly. According to the step 2, the center value of the steam seal tooth is measured by using a dummy shaft tool:

[0124] Step 21: Determine the measurement point;

[0125] Select multiple measuring points evenly in the circumferential direction of the steam seal teeth, generally no less than 8 points, to ensure that the center position of the steam seal teeth can be fully reflected;

[0126] Step 22: Measure the radial clearance:

[0127] Use an inside micrometer or other suitable measuring tool to measure the radial clearance between the steam seal tooth and the dummy shaft at each measuring point, record the radial clearance value at each measuring point, and calculate its average value as a preliminary reference for the radial center value;

[0128] Step 23: Measure the axial clearance

[0129] Use a feeler gauge or micrometer to measure the gap between the steam seal tooth and the end of the dummy shaft or a specific reference surface in the axial direction. Perform multiple measurements at different axial positions, record the measurement results, and calculate the axial center value.

[0130] According to the method of machining the rotor by CNC horizontal lathe described in step 1:

[0131] Blank preparation;

[0132] According to the design requirements of the rotor, choose the appropriate blank material, such as stainless steel, alloy steel, etc. The size of the blank should reserve enough processing allowance, generally about 3-5mm per side, to ensure that subsequent processing can remove the defects on the surface of the material and reach the designed size.

[0133] Check the quality of the blank material, including whether there are defects such as cracks and pores. For important rotors, flaw detection may also be required.

[0134] Clamping, positioning and processing:

[0135] Choose the appropriate clamping method according to the shape and size of the rotor. If the rotor is a shaft part, a three-jaw chuck or a four-jaw chuck is usually used for clamping. For longer rotors, a center is also required to assist in support to prevent deformation during processing.

[0136] After clamping, the rotor should be aligned to ensure that its axis coincides with the axis of the lathe spindle. Generally, the coaxiality error is required to be within 0.05mm to ensure the machining accuracy.

[0137] First turn the outer circle of the rotor, and then turn from large diameter to small diameter. For example, for a multi-stage shaft rotor, turn the outermost journal part first, and then turn inwards in sequence.

[0138] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for measuring flow through a thermal power steam turbine assembly, characterized in that: The method comprises the following steps: Step 1: Processing of steam seal teeth of the stator sleeve of the steam turbine: Use high-precision CNC vertical lathe to process the steam seal teeth of the stator sleeve of the steam turbine. Ensure the concentricity requirements of the flow position of the stator sleeve, connect the stator sleeve and the rotor of the steam turbine, and measure the machining diameter between the stator sleeve and the rotor of the steam turbine. The diameter data is ΦA; Step 2: Measurement of the center of the turbine stator sleeve: During the general assembly of the steam turbine, the stator sleeve of the steam turbine is assembled and centered in the general assembly workshop, the concentricity of each sleeve is measured, and the center value of the steam seal tooth is measured using a dummy shaft tool. The steam seal tooth is measured at the ΦA position, where the upper and lower deviations are ω and the left and right deviations are δ; Step 3: Merge the stator housing of the steam turbine: Use the lifting equipment to lift the stator cover that needs to be combined, move the lifted stator cover to the top of the lower part, make preliminary docking, and tighten the center face bolts; Step 31: Adjustment of the stator sleeve of the steam turbine: Use a jack or other axial adjustment tools to axially adjust the stator sleeve and measure the axial clearance; Step 32: Retest the steam seal: After merging the upper half of the stator sleeve, re-measure the diameter ΦA of the steam seal to ensure that the deviation from the machining is within 0.10mm; Step 33: Deviation verification: Measure the diameter of the steam seal teeth at the flow-through position, compare it with the processing data, and verify the deviation; Step 4: Rotor processing: Use CNC horizontal lathe to process the rotor, ensure the concentricity of the shroud and the body, and measure the processing diameter ΦB; Step 5: Calculation of radial flow clearance and repair of steam seal teeth: Calculate radial flow clearance and repair steam seal teeth, radial clearance j 左、 j 右、 j 天 and j 地 , based on which the left, right, top and ground radial clearances of all levels are calculated and compared with the design requirements; Process those that are out of tolerance and repeat steps 2 to 5 until the radial flow size is qualified.

2. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the j in step 5 左 =(ΦA-ΦB) / 2+δ; Among them, ΦA---the diameter of the stator sleeve at the flow position; ΦB---Rotor flow position diameter size; δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative; j 左 ---The radial left clearance value between the turbine rotor and the stator sleeve.

3. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the j in step 5 右 =(ΦA-ΦB) / 2-δ; Among them, ΦA---the diameter of the stator sleeve at the flow position; ΦB---Rotor flow position diameter size; δ---The left and right deviation of the stator sleeve measured by the dummy shaft fixture, the right eccentricity is positive and the left eccentricity is negative; j 右 ---The radial right clearance value between the turbine rotor and the stator sleeve.

4. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the j in step 5 天 =(ΦA-ΦB) / 2+ω; Among them, ΦA---the diameter of the stator sleeve at the flow position; ΦB---Rotor flow position diameter size; ω---Using the false shaft fixture to measure the upper and lower deviations of the stator sleeve, the lower eccentricity is positive and the upper eccentricity is negative; j 天 ---The radial clearance value between the turbine rotor and the stator sleeve.

5. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the j in step 5 地 (ΦA-ΦB) / 2-ω; Among them, ΦA---the diameter of the stator sleeve at the flow position; ΦB---Rotor flow position diameter size; ω---Using the false shaft fixture to measure the upper and lower deviations of the stator sleeve, the lower eccentricity is positive and the upper eccentricity is negative; j 地 ---The radial clearance value between the turbine rotor and the stator sleeve.

6. A method for measuring flow through a thermal power steam turbine assembly according to claim 2, 3, 4 or 5, characterized in that: ΦA is the diameter of the stator sleeve at the flow position or ΦA is the diameter of the steam seal.

7. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: The steam turbine stator sleeve is an inner cylinder or a partition sleeve or a partition.

8. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the method described in step 1, using a high-precision CNC vertical lathe to process the steam seal teeth of the stator sleeve of a steam turbine; Step 1: Clamping and positioning: Fix the steam seal tooth blank by a fixture. The fixture should ensure the stability of the steam seal tooth during processing, and the positioning surface of the fixture should be closely fitted with the key reference surface of the steam seal tooth. Step 1 and 2: Alignment of the blank: Use tools such as dial indicators to align the blank to ensure that the axis of the steam seal tooth coincides with the axis of the machine tool spindle, so that the machining allowance is evenly distributed and the error is controlled within a very small range; Step 13: Steam seal tooth detection: Use measuring tools to measure the size of steam seal teeth in real time; Step 14: Surface preparation and cleaning: According to the working environment and requirements of the steam turbine, the steam seal teeth are appropriately treated with surface anti-rust and wear-resistant coating.

9. A method for measuring flow through a thermal power steam turbine assembly according to claim 1, characterized in that: According to the method described in step 2 for measuring the center value of the steam seal tooth using a dummy shaft tool: Step 21: Determine the measurement point; Select multiple measuring points evenly in the circumferential direction of the steam seal teeth, generally no less than 8 points, to ensure that the center position of the steam seal teeth can be fully reflected; Step 22: Measure the radial clearance: Use an inside micrometer or other suitable measuring tool to measure the radial clearance between the steam seal tooth and the dummy shaft at each measuring point, record the radial clearance value at each measuring point, and calculate its average value as a preliminary reference for the radial center value; Step 23: Measure the axial clearance Use a feeler gauge or micrometer to measure the gap between the steam seal tooth and the end of the dummy shaft or a specific reference surface in the axial direction. Perform multiple measurements at different axial positions, record the measurement results, and calculate the axial center value.

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