Method for measuring center deviation of shafting of turboset

Abstract

The invention discloses a turboset shafting center deviation measurement method. The method comprises the following steps: selecting a plurality of measurement positions along a turboset shafting on a basic platform of a turboset; installing a settlement monitoring system on the foundation platform; acquiring the elevation variation at each measurement position in the measurement time period; and according to the elevation variation at the plurality of measurement positions, the position data of the plurality of measurement positions and the size and position data of each pair of wheels in the turboset, obtaining the shafting center deviation of the turboset. According to the invention, on-line measurement of the shafting center deviation of the turboset is realized.

Description

Technical Field

[0001] The present application relates to the technical field of steam turbines, and in particular to a method for measuring the center deviation of a shaft system of a steam turbine unit. Background Art

[0002] As the turbine unit's operating conditions change and the running time increases, the turbine unit's foundation platform will settle unevenly, causing the shaft center to change. The change in the shaft center will lead to the redistribution of the load on each bearing of the unit. In severe cases, excessive bearing load and high temperature will cause local tungsten metallization, or too light bearing load will cause unstable oil film vortex or even oil film oscillation. Therefore, it is necessary to measure and adjust the deviation of the turbine unit's shaft center.

[0003] At present, in order to measure the deviation of the center of the shaft system, it is necessary to disassemble the wheel in the shaft system during the overhaul process, and then use auxiliary tools such as dial indicators to measure the center deviation of the wheel. However, there are multiple wheels in the steam turbine unit, and the center deviation data of multiple wheels are combined to form the deviation of the center of the steam turbine unit shaft system. Therefore, in the overhaul process, if you want to measure the deviation of the center of the entire shaft system, you need to disassemble and assemble multiple wheels.

[0004] Each time a pair of wheels is disassembled, at least 24 hours of overhaul time is required. This disassembly measurement method requires a lot of work and leads to a long overhaul time. Summary of the invention

[0005] The present application provides a method for measuring the center deviation of a steam turbine unit shaft system, aiming to solve the problems of long time and heavy workload of existing measurement methods.

[0006] The technical solution adopted by this application to solve its technical problem is:

[0007] A method for measuring the center deviation of a steam turbine shaft system is constructed, comprising:

[0008] Select multiple measuring positions along the shaft system of the steam turbine unit on the foundation platform of the steam turbine unit;

[0009] Installing a settlement monitoring system on the basic platform;

[0010] Obtaining the elevation change at each of the measuring positions within a measuring time period;

[0011] The center deviation of the steam turbine unit shaft system is obtained based on the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the size and position data of each pair of wheels in the steam turbine unit.

[0012] In some embodiments, the sedimentation monitoring system includes a plurality of sedimentation testing mechanisms and at least one communication mechanism, wherein the sedimentation testing mechanisms form a test cavity for containing a test liquid;

[0013] The step of installing the settlement monitoring system on the basic platform comprises:

[0014] Adjusting the flatness of the base platform at each of the measuring positions to be within a first preset range;

[0015] At least one settlement testing mechanism is installed at each of the measuring positions;

[0016] The test chambers of two adjacent sedimentation test mechanisms are connected via a connecting mechanism.

[0017] In some embodiments, adjusting the flatness of the base platform at each of the measuring positions to be within a first preset range includes:

[0018] The surface of the base platform at each of the measuring positions is polished so that the flatness of the base platform at each of the measuring positions is within the first preset range.

[0019] In some embodiments, at least one of the settlement testing mechanisms is installed at each of the measurement positions, including:

[0020] Adjusting the absolute elevation of each of the measuring positions so that the difference between the absolute elevations of any two of the measuring positions is within a second preset range;

[0021] At least one settlement testing mechanism is installed at each measuring position after the absolute elevation is adjusted.

[0022] In some embodiments, after the step of installing the settlement monitoring system on the base platform and before the step of obtaining the elevation change at each of the measurement positions within the measurement time period, the method further includes:

[0023] The settlement monitoring system is filled with water and vented.

[0024] In some embodiments, the communication mechanism includes an air pipe and a water pipe, the air pipe is used to connect the test chambers of two adjacent sedimentation test mechanisms, and the water pipe is used to connect the test chambers of two adjacent sedimentation test mechanisms;

[0025] The step of filling the settlement monitoring system with water and exhausting the air comprises:

[0026] Blocking the air pipe between each two adjacent sedimentation test mechanisms;

[0027] Connecting the settlement monitoring system to a water source so as to fill the settlement monitoring system with water through the water source and discharge the gas in the water pipe;

[0028] The settlement monitoring system is disconnected from the water source to stop filling the settlement monitoring system with water through the water source, and the air pipe between each adjacent two settlement testing mechanisms is unblocked.

[0029] In some embodiments, obtaining the elevation change at each of the measurement positions within the measurement time period includes:

[0030] At an initial moment of the measurement time period, obtaining a first liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions;

[0031] At the end time of the measurement time period, obtaining a second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions;

[0032] The elevation change at each of the measuring positions within a measuring time period is obtained through the first liquid level value and the second liquid level value at each of the measuring positions.

[0033] In some embodiments, the measuring positions are arranged in one-to-one correspondence with the bearings of the steam turbine unit; the measuring positions include two measuring points, the two measuring points are symmetrically distributed on both sides of the bearing, and the connecting line of the two measuring points is perpendicular to the center line of the bearing; each measuring point is equipped with a settlement test mechanism;

[0034] The step of obtaining the first liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions at the initial moment of the measurement time period includes:

[0035] At the initial moment of the measurement time period, obtaining the third liquid level value in the test cavity of the sedimentation test mechanism at the two measurement points of each measurement position; obtaining the first liquid level value in the test cavity of the sedimentation test mechanism at each measurement position by averaging the third liquid level values ​​of the two measurement points;

[0036] The step of obtaining the second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions at the end time of the measurement time period includes:

[0037] At the end time of the measurement time period, the fourth liquid level value in the test cavity of the sedimentation test mechanism at the two measurement points of each of the measurement positions is obtained; and the second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions is obtained by averaging the fourth liquid level values ​​of the two measurement points.

[0038] In some embodiments, obtaining the center deviation of the shafting of the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size and position data of each pair of wheels in the steam turbine unit includes:

[0039] According to the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the size data of each pair of wheels in the steam turbine unit, respectively obtaining the plane deviations between each adjacent rotor in the steam turbine unit;

[0040] According to the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the position data of each pair of wheels in the steam turbine unit, respectively obtaining the circumferential deviations between each adjacent rotor in the steam turbine unit;

[0041] The center deviation of the turbine unit shaft system is formed by combining the plane deviation between adjacent rotors and the circumferential deviation between adjacent rotors.

[0042] In some embodiments, the step of respectively obtaining the plane deviation between adjacent rotors in the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size data of each pair of wheels in the steam turbine unit comprises:

[0043] According to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size of each pair of wheels in the steam turbine unit, respectively obtain the elevation changes of the measurement positions adjacent to the front and rear sides of each rotor in two adjacent rotors, the distance between the measurement positions adjacent to the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor;

[0044] The plane deviation of the two adjacent rotors is obtained according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor.

[0045] In some embodiments, obtaining the plane deviation of the two adjacent rotors according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor in the two adjacent rotors, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor includes:

[0046] Obtaining the plane deviation of the two adjacent rotors according to Formula 1;

[0047]

[0048] Where ΔP is the plane deviation between the two rotors;

[0049] ΔP0 is the initial plane deviation between the two rotors;

[0050] Δi 11 is the elevation change of the adjacent measuring position on the front side of the front rotor;

[0051] D 12 is the diameter of the adjacent pair of wheels on the rear side of the front rotor;

[0052] L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor;

[0053] Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor;

[0054] Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor;

[0055] D 21 is the diameter of the adjacent pair of wheels on the front side of the rear rotor;

[0056] L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor;

[0057] Δi 22 It is the elevation change of the adjacent measuring position on the rear side of the rear rotor.

[0058] In some embodiments, the step of respectively obtaining the circumferential deviations between adjacent rotors in the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the position data of each pair of wheels in the steam turbine unit comprises:

[0059] According to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the position data of each pair of wheels in the steam turbine unit, respectively obtain the elevation changes of the measurement positions adjacent to the front and rear sides of each rotor in two adjacent rotors, the distance between the measurement positions adjacent to the front and rear sides of each rotor, the distance from the measurement position adjacent to the rear side of the front rotor to the adjacent pair of wheels, and the distance from the measurement position adjacent to the front side of the rear rotor to the adjacent pair of wheels;

[0060] The circumferential deviation of the two adjacent rotors is obtained based on the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measuring position on the front side of the rear rotor to the adjacent pair of wheels on the front side.

[0061] In some embodiments, obtaining the circumferential deviation of the two adjacent rotors according to the elevation change of the adjacent measurement positions on the front and rear sides of each rotor of the two adjacent rotors, the distance between the adjacent measurement positions on the front and rear sides of each rotor, the distance from the adjacent measurement position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measurement position on the front side of the rear rotor to the adjacent pair of wheels on the front side includes:

[0062] Obtain the circumferential deviation of the two adjacent rotors according to Formula 2;

[0063]

[0064] Where ΔC is the circumferential deviation between the two rotors;

[0065] ΔC0 is the initial circumferential deviation between the two rotors;

[0066] Δi 11 is the elevation change of the adjacent measuring position on the front side of the front rotor;

[0067] L 122 The distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side;

[0068] L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor;

[0069] Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor;

[0070] Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor;

[0071] L 211 The distance from the front adjacent measuring position of the rear rotor to the front adjacent pair of wheels;

[0072] L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor;

[0073] i 22 It is the elevation change of the adjacent measuring position on the rear side of the rear rotor.

[0074] In some embodiments, the measuring positions are arranged in one-to-one correspondence with the bearings of the steam turbine unit, and a line connecting the measuring position and the corresponding bearing is perpendicular to a center line of the bearing.

[0075] This application has the following beneficial effects:

[0076] The present application can realize online measurement of the shaft center deviation of the steam turbine unit by obtaining the elevation change at each measurement position on the foundation platform of the steam turbine unit, the position data of each measurement position, and using the size and position data of each pair of wheels of the steam turbine unit. Such a measurement method can avoid disassembly of the wheels, thereby reducing the workload and shortening the measurement time. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0078] Figure 1 It is a structural schematic diagram of one of the steam turbine units used in this application;

[0079] Figure 2 yes Figure 1 The state change diagram of the foundation platform settlement process in the steam turbine unit shown;

[0080] Figure 3 yes Figure 1 The structural schematic diagram of the steam turbine unit shown is equipped with a settlement monitoring system;

[0081] Figure 4 yes Figure 3 A partial structural diagram of the settlement monitoring system in FIG.

[0082] Figure 5 Part of the settlement monitoring system Figure 2 The state change diagram of the foundation platform during the settlement process shown;

[0083] Figure 6 yes Figure 3 The schematic diagram of the structure of the leveling tool used in the installation process of the settlement monitoring system shown;

[0084] Figure 7 yes Figure 3 The structural schematic diagram of the settlement monitoring system shown in the process of water filling and exhaust;

[0085] Figure 8 yes Figure 3 The schematic diagram of the status of the steam turbine unit shown is during the process of measuring the center deviation of the shaft system;

[0086] Fig. 9 is a flow chart of a method for measuring the center deviation of a shaft system of a steam turbine unit in one embodiment of the present application;

[0087] Fig.10 yes Fig. 9 The flowchart of step S2 shown in some embodiments;

[0088] Fig.11 yes Fig.10 The flowchart of step S22 shown in some embodiments;

[0089] Fig.12 yes Fig. 9 The flowchart of step S3 shown in some embodiments;

[0090] Fig.13 yes Fig. 9 The flowchart of step S3 shown in other embodiments;

[0091] Fig.14 yes Fig. 9 The flowchart of step S5 shown in some embodiments;

[0092] Fig.15 yes Fig. 9 The flowchart of step S4 shown in some embodiments;

[0093] Fig.16 yes Fig. 9 The flowchart of step S4 shown in other embodiments;

[0094] Reference numerals:

[0095] 1-sedimentation monitoring system; 11-sedimentation test mechanism; 111-test shell; 111a-first test shell; 111b-second test shell; 111c-third test shell; 1111-test chamber; 1112-liquid inlet; 1113-liquid outlet; 1114-gas inlet; 1115-gas outlet; 112-liquid level test head; 113-cover plate; 12-connecting mechanism; 121-water pipe; 122-gas pipe; 20-collection device; 2-steam turbine unit; 201-basic platform; 202-high-pressure cylinder; 203-first low-pressure cylinder; 204-second low-pressure cylinder Cylinder; 205-generator; 206-exciter; 207-bearing; 2071-first bearing; 2072-second bearing; 2073-third bearing; 2074-fourth bearing; 208-pair of wheels; 2081-first pair of wheels; 2082-second pair of wheels; 2083-third pair of wheels; 209-support frame; 210-support spring; 100-first rotor; 200-second rotor; 3-leveling tool; 31-leveling shell; 311-leveling cavity; 32-leveling pipe; 4-water filling passage; 41-water filling pipe; 42-water pump; 43-water storage tank; 44-drainage tank. DETAILED DESCRIPTION

[0096] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside", "inside", "outside", etc. are based on the directions or positional relationships shown in some of the drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present application.

[0097] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0098] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0099] like Figure 1As shown, the steam turbine unit 2 includes a base platform 201, a high-pressure cylinder 202, a first low-pressure cylinder 203, a second low-pressure cylinder 204, a generator 205, an exciter 206, a support frame 209, a plurality of bearings 207, a plurality of pairs of wheels 208, and a plurality of support springs 210. Among them, the high-pressure cylinder 202, the first low-pressure cylinder 203, the second low-pressure cylinder 204, the generator 205, and the exciter 206 are sequentially arranged on the base platform 201, and the rotors of the five are sequentially connected through the pairs of wheels 208, and are respectively supported on the base platform 201 through bearings 207 to form a shaft system. The support frame 209 is used to support the base platform. A plurality of support springs 210 are arranged at intervals between the support frame 209 and the base platform 201, and the support height of the support frame 209 to the base platform 201 can be adjusted.

[0100] It is important to understand that Figure 2 , as the operating conditions of the steam turbine unit 2 change during operation, and as it runs for a long time. The foundation platform 201 may produce uneven settlement, which will cause changes in the center of the shaft system set on the platform. Changes in the shaft system will lead to a redistribution of the loads of the bearings of the steam turbine unit 2. Some bearings may be overloaded, overheated, or underloaded. Excessive increases in the load and temperature of the bearings may cause local melting of tungsten gold. Excessive reductions in the load of the bearings may cause unstable oil film vortexes or even oil film oscillations. Therefore, it is necessary to regularly measure whether the center of the shaft system of the steam turbine unit 2 has deviated, so as to make timely adjustments according to the size of the deviation and reduce the occurrence of the above-mentioned problems.

[0101] The present application constructs a method for measuring the center deviation of the shaft system of a steam turbine unit, which can realize the online measurement of the center deviation of the shaft system of the steam turbine unit 2. Such a measurement method can avoid the disassembly of the wheel, thereby reducing the workload and shortening the measurement time.

[0102] It should be noted that, for the steam turbine unit shaft center deviation measurement method, in order to conveniently and clearly describe the usual execution steps of the monitoring method, the content of each step is marked with a serial number when describing it, so as to correspond to the execution steps in the attached figure, and to clearly understand the usual execution method of the steam turbine unit shaft center deviation measurement method. However, this marking of the step serial number does not limit the necessary order of each execution step in the steam turbine unit shaft center deviation measurement method. Those skilled in the art can also select one or some steps in the steam turbine unit shaft center deviation measurement method according to actual needs and arrange them separately or in a recombined manner to achieve specific or expected technical purposes, which is not limited here.

[0103] like Fig. 9 As shown, the method for measuring the center deviation of the steam turbine unit shaft system may include:

[0104] Step S1, selecting a plurality of measuring positions along the shaft system of the steam turbine unit on the foundation platform 201 of the steam turbine unit 2.

[0105] Step S2: installing the settlement monitoring system 1 on the basic platform 201 .

[0106] Step S3: Obtain the elevation change at each measuring position within the measuring time period.

[0107] Step S4, obtaining the center deviation of the shaft system of the steam turbine unit 2 according to the elevation change at each measuring position, the position data between multiple measuring positions, and the size and position data of each pair of wheels in the steam turbine unit.

[0108] It should be understood that the positional relationship between multiple measurement positions can be measured by tools such as a measuring ruler. However, measurement errors are inevitable during the measurement process. When the steam turbine unit 2 leaves the factory, there are detailed data on the distances and sizes between the various devices.

[0109] Therefore, in some embodiments, in order to ensure the accuracy of the measurement, the measurement position in step S1 can be set in a one-to-one correspondence with the bearing 207 of the steam turbine unit 2. Figure 1 and Figure 3 As shown, the line connecting each measuring position and the corresponding bearing 207 may be perpendicular to the center line M of the bearing 207 .

[0110] Such a setting can convert the position data of each measurement position on the basic platform 201 into the position of each bearing 207 on the basic platform 201. Since the size and distance between each bearing 207 and other components of the steam turbine unit 2 are recorded in detail, the measurement process can be avoided, thereby avoiding measurement errors and improving the accuracy of the measurement.

[0111] It should be understood that the center line M of the bearing 207 can be understood as the center line of the shaft system of the steam turbine unit 2, and the axes of the rotors, bearings 207 and counter wheels 208 of the steam turbine unit 2 can all coincide with the center line M. The extension direction of the center line M can be understood as the extension direction of the shaft system of the steam turbine unit 2.

[0112] In some embodiments, the measurement position may include two measurement points, and the two measurement points may be symmetrically distributed on opposite sides of the corresponding bearing 207. The line connecting the two measurement points passes through the center of the bearing 207 and is perpendicular to the center line M of the bearing 207.

[0113] It should be understood that, due to the large size of the steam turbine unit 2, if only one measuring point is set on one side of the position corresponding to the bearing 207, measurement errors are likely to occur. When two measuring points are selected at each measuring position, and the two measuring points are symmetrically distributed on both sides of the bearing 207, the error can be reduced by taking the average value of the data of the two measuring points during the measurement process, thereby further improving the accuracy of the measurement.

[0114] Therefore, in some embodiments, step S3 may include:

[0115] The elevation changes of the two measuring points at each measuring position within the measuring time period are obtained respectively. When the elevation changes of the two measuring points at the measuring position are different, the elevation change of the measuring position is obtained by taking the average value according to the elevation changes of the two measuring points.

[0116] like Figure 3 As shown, in some embodiments, the settlement monitoring system 1 may include a connecting pipe device 10 and a collection device 20. The connecting pipe device 10 includes a plurality of settlement test mechanisms 11 and a connecting mechanism 12. The plurality of settlement test mechanisms 11 may be respectively installed at each measurement position to be measured on the base platform 201, and are used to measure the settlement values ​​at each measurement position. The connecting mechanism 12 may connect the plurality of settlement test mechanisms 11 to balance the pressure values ​​between the settlement test mechanisms 11, and improve the accuracy of the measurement. The collection device 20 is electrically connected to the connecting pipe device 10, and is used to collect the settlement values ​​measured by the connecting pipe device 10 at each measurement position.

[0117] Read also Figure 4 , the sedimentation test mechanism 11 may include a test housing 111, a liquid level test head 112 and an exhaust cover 113. A test chamber 1111 is formed in the test housing 111 for accommodating a test liquid. The test liquid can separate the test chamber 1111 into a gas part and a liquid part. The test housing 111 is also formed with a liquid inlet 1112, a liquid outlet 1113, a gas inlet 1114 and a gas outlet 1115. The liquid inlet 1112 and the liquid outlet 1113 respectively connect the liquid part of the test chamber 1111 with the outside world. The gas inlet 1114 and the gas outlet 1115 respectively connect the gas part of the test chamber 1111 with the outside world.

[0118] The communication mechanism 12 may include a water pipe 121 and an air pipe 122, and the two ends of the water pipe 121 may be respectively connected to the liquid inlet 1111 and the liquid outlet 1113 of two adjacent sedimentation test mechanisms 11, thereby connecting the test chambers 1111 of the two adjacent sedimentation test mechanisms 11. The test liquid may enter the test chamber 1111 of another sedimentation test mechanism 11 through the water pipe 121 in the test chamber 1111 of one sedimentation test mechanism 11. The two ends of the air pipe 122 may be respectively connected to the gas inlet 1114 and the gas outlet 1115 of the two adjacent sedimentation test mechanisms 11, thereby connecting the test chambers 1111 of the two adjacent sedimentation test mechanisms 11. The gas may enter the test chamber 1111 of another sedimentation test mechanism 11 through the air pipe 122 in the test chamber 1111 of one sedimentation test mechanism 11.

[0119] The liquid level test head 112 can be arranged on the test housing 111, and is used to obtain the liquid level value of the test liquid in the test housing 111. Each liquid level test head 112 can be electrically connected to the acquisition device 20, so that the acquisition device 20 can collect the acquired liquid level value. Through the change of the liquid level value over a period of time, the liquid level change value within the period of time can also be obtained.

[0120] It should be understood that, in interconnected containers, under isobaric conditions, liquids always seek to reach the same potential energy level. Therefore, the settlement monitoring system 1 can use the connecting pipe device 10 to arrange multiple settlement test mechanisms 11 on the base platform 201, and ensure the connectivity of the liquid and the consistency of the air pressure through the connection of the water pipe 121 and the air pipe 122. After selecting the reference point, the liquid level change value of each settlement test mechanism 11 within a period of time can also be understood as the settlement value of the base platform 201 at each corresponding position during this period of time.

[0121] It should be understood that the test liquid can be water or other liquids. The liquid level test head 112 can detect the liquid level value of the test liquid by laser, ultrasonic wave, capacitance and other distance measurement methods. No specific limitation is made here.

[0122] Below Figure 5 Taking the specific situation shown as an example, the principle of the settlement monitoring system 1 is further explained.

[0123] Figure 5The figure shows the liquid level change of the settlement monitoring system 1 in a specific embodiment over a period of time. The settlement monitoring system 1 is now defined to include a first test housing 111a, a second test housing 111b, and a third test housing 111c, and also includes a first liquid level test head 112a, a second liquid level test head 112b, and a third liquid level test head 112c. The first test housing 111a and the second test housing 111b are connected through a water pipe 121, and the second test housing 111b and the third test housing 111c are connected through a water pipe 121. The first liquid level test head 112a is arranged on the first test housing 111a, the second liquid level test head 112b is arranged on the second test housing 111b, and the third liquid level test head 112c is arranged on the third test housing 111c.

[0124] Now, the bottom wall of each test housing 111 is selected as the reference surface, and the distance from the liquid level test head 112 to the reference surface is defined as d, and the distance from the liquid surface to the reference surface (i.e., the liquid level value) is defined as h. Then, the value measured by the liquid level test head 112 can be dh.

[0125] Under the premise of consistent internal air pressure, the distance h from the liquid surface to the reference surface in each test shell 111 is the same through the connection of the water pipe 121. Now define the liquid level value in the first test shell 111a as h1, the liquid level value in the second test shell 111b as h2, and the liquid level value in the third test shell 111c as h3.

[0126] After a period of operation, assuming that the basic platform 201 settles, the liquid level value in the first test shell 111a becomes h′1, the liquid level value in the second test shell 111b becomes h′2, and the liquid level value in the third test shell 111c becomes h′3.

[0127] Then, during this time period, the settlement value (liquid level change value) at the first test housing 111a is h'1-h1. The settlement value (liquid level change value) at the second test housing 111b is h'2-h2. The settlement value (liquid level change value) at the third test housing 111c is h'3-h3.

[0128] like Fig.12 As shown, in some embodiments, step S3 may include:

[0129] Step S31 : at the initial moment of the measurement time period, obtaining the first liquid level value h in the test cavity 1111 of the sedimentation test mechanism 11 at each measurement position.

[0130] Step S32: At the end of the measurement time period, obtain the second liquid level value h′ in the test cavity of the sedimentation test mechanism 11 at each measurement position.

[0131] Step S33: Obtain the elevation change at each measuring position within the measuring time period through the first liquid level value h and the second liquid level value h′ at each measuring position.

[0132] Now still Figure 5 A specific embodiment shown is used to further illustrate step S3.

[0133] It should be understood that if the position (measurement position) of one of the test housings 111 is selected as a calibration point, the elevation changes of other positions within a period of time can be calculated.

[0134] It is now defined that the position of the first test housing 111 a is the first measurement position, the position of the second test housing 111 b is the second measurement position, and the position of the third test housing 111 c is the third measurement position.

[0135] For example, if the first measurement position is selected as the calibration point, the elevation change of the second measurement position relative to the first measurement position is (h′2-h2)-(h′1-h1). The elevation change of the third measurement position relative to the first measurement position is (h′3-h3)-(h′1-h1). The elevation change of the first measurement position relative to the first measurement position can be regarded as zero.

[0136] like Fig.13 As shown, for an embodiment in which each measurement position includes two measurement points, step S31 may include:

[0137] Step S311 : at the initial moment of the measurement time period, obtaining the third liquid level value in the test cavity 1111 of the sedimentation test mechanism 11 at two measurement points of each measurement position.

[0138] Step S312: Obtain the first liquid level value h in the test cavity 1111 of the sedimentation test structure 11 at each measuring position by averaging the third liquid level values ​​at the two measuring points.

[0139] Step S32 may include:

[0140] Step S321 : At the end of the measurement time period, obtain the fourth liquid level values ​​in the test cavity 1111 of the sedimentation test mechanism 11 at two measurement points at each measurement position.

[0141] Step S322: Obtain the second liquid level value h′ in the test cavity 1111 of the sedimentation test mechanism 11 at each measuring position by averaging the fourth liquid level values ​​at the two measuring points.

[0142] It should be understood that if the "initial time" is defined as t1 and the "end time" is defined as t2, then the "measurement time period" is t1-t2. The specific values ​​of t1 and t2 can be flexibly set according to specific circumstances and are not specifically limited here.

[0143] like Fig.10 As shown, in some embodiments, step S2 may include:

[0144] Step S21 : adjusting the flatness of the base platform 201 at each measuring position to be within a first preset range.

[0145] Step S22: Install at least one settlement testing mechanism 11 at each measuring position.

[0146] Step S23 , connecting the test chambers 1111 of two adjacent sedimentation test mechanisms 11 through a connecting mechanism 12 .

[0147] It should be understood that, since the shaft center deviation of the steam turbine unit 2 is relatively small compared to the size of the steam turbine unit 2, in order to ensure the accuracy of the measurement, the setting of the test chamber 1111 in the settlement test mechanism 11 is also relatively small, and its measuring range can be selected from a dozen millimeters to several tens of millimeters, or even hundreds of millimeters, according to the size of the shaft center deviation of the steam turbine unit 2.

[0148] During the installation of the settlement monitoring system 1, the different flatness of various positions of the base platform 201 may cause the test cavity 1111 in the settlement test mechanism 11 to be tilted or unstable after installation, which may exceed its measuring range and cause measurement errors.

[0149] By setting step S21, the potential tilting and instability of the test cavity 1111 can be effectively reduced, thereby further reducing the generation of measurement errors.

[0150] In some embodiments, step S21 may include: polishing the surface of the base platform 201 at each measuring position so that the flatness of the base platform 201 at each measuring position is within a first preset range.

[0151] It should be understood that the first preset range can be adjusted accordingly for different ranges of the sedimentation test mechanism 11. For example, the first preset range can be selected as ≤0.01mm, ≤0.02mm, ≤0.03mm, ≤0.04mm, ≤0.05mm, etc.

[0152] For the embodiment in which each measuring position includes two measuring points, the flatness of each measuring point can be adjusted separately. A settlement test mechanism 11 can be installed on each measuring point. That is, two settlement test mechanisms 11 can be correspondingly arranged on one measuring position.

[0153] like Fig.11 As shown, in some embodiments, step S22 may include:

[0154] Step S221, adjusting the absolute elevation of each measuring position so that the difference between the absolute elevations of any two measuring positions is within a second preset range;

[0155] Step S222: at least one settlement testing mechanism 11 is installed at each measuring position after the absolute elevation is adjusted.

[0156] It should be understood that, due to the large area of ​​the foundation platform 201 of the steam turbine unit 2, the absolute elevations of the various measurement positions may be inconsistent. The inconsistency of the absolute elevations may cause problems such as large height differences between different test chambers 1111, which may also lead to problems such as exceeding the measurement range and causing measurement errors.

[0157] By setting step S221, the problem of height difference between different test cavities 1111 can be effectively reduced, thereby further reducing the generation of measurement errors.

[0158] In some embodiments, the absolute elevation can be adjusted using a leveling tool 3 .

[0159] like Figure 6 As shown, the leveling tool 3 may include at least two leveling shells 31 and a leveling pipe 32. The leveling shell 31 defines a leveling cavity 311, the leveling cavity 311 contains a leveling liquid, and a scale for reading the liquid level is provided on the leveling shell 31. The leveling pipe 32 connects the two leveling cavities 311 so that the leveling liquid can flow in the two leveling cavities 311.

[0160] The step S221 may include:

[0161] By installing different numbers of adjustment gaskets at the measuring positions, the absolute elevation of each measuring position is adjusted so that the difference between the absolute elevations of any two measuring positions is within the second preset range.

[0162] One of the leveling shells 31 of the leveling tool 3 is installed at one measuring position, and the other leveling shell 31 is installed at another measuring position. The scale values ​​corresponding to the liquid levels of the leveling fluids in the two leveling shells 31 are compared.

[0163] If the difference between the two scale values ​​is within the target difference range, the leveling is terminated. If the difference between the two scale values ​​is outside the target difference range, the leveling is repeated.

[0164] It should be understood that, for the installation of the adjustment gasket, the surface of the adjustment gasket also needs to meet the aforementioned flatness requirement.

[0165] In some other optional embodiments, the number of leveling shells 31 in the leveling tool 3 can also be set to three, four, or more, and multiple leveling pipes 32 are provided to interconnect each other so that the absolute elevations at multiple measuring positions can be adjusted at one time through one leveling tool 3.

[0166] In some embodiments, the absolute height difference between the multiple measurement positions after the absolute height adjustment may be less than or equal to 0.5 mm. That is, the aforementioned second preset range may be ≤0.5 mm.

[0167] It should be understood that for the settlement test mechanism 11 of different ranges, the second preset range after leveling can also be adaptively adjusted. For the settlement test mechanism 11 of a larger range, the second preset range can also be ≤0.6mm, ≤0.8mm or other ranges.

[0168] like Fig. 9 As shown, in some embodiments, between step S2 and step S3, the method for measuring the center deviation of the steam turbine unit shaft system may further include:

[0169] Step S5, filling water and exhausting air from the sedimentation monitoring system 1.

[0170] It should be understood that during the installation of the settlement monitoring system 1, there is no liquid in the water pipe 121 of the communication mechanism 12, but there is gas. Therefore, during the measurement process, the gas in the water pipe 121 easily makes it difficult for the liquids in each test cavity 1111 to flow to each other, which in turn leads to a reduction in measurement accuracy. By filling and exhausting the settlement monitoring system 1 before measurement, the reduction in measurement accuracy can be effectively avoided.

[0171] like Fig.14 As shown, in some embodiments, step S5 includes:

[0172] Step S51 , blocking the air pipe 122 between each two adjacent sedimentation test mechanisms 11 .

[0173] Step S52 , connecting the settlement monitoring system 1 to a water source so as to fill the settlement monitoring system 1 with water through the water source and discharge the gas in the water pipe 121 .

[0174] Step S53 , disconnecting the settlement monitoring system 1 from the water source to stop filling the settlement monitoring system 1 with water through the water source, and unblocking the air pipe 122 between each two adjacent settlement test mechanisms 11 .

[0175] It should be understood that, in step S51 , blocking the gas pipe 122 can be achieved by removing the gas pipe 122 and blocking the gas inlet 1114 and the gas outlet 1115 of each test housing 111 .

[0176] Read also Figure 7 In step S52 , water is filled into the settlement monitoring system 1 , which can be achieved by forming a water filling passage 4 on the settlement monitoring system 1 .

[0177] For example, a water storage tank 43, a drainage tank 44, a water pump 42, and a plurality of water filling pipes 41 may be provided on the settlement monitoring system 1. The water filling pipe 41 may be connected to the liquid inlet 1112 of the test shell 111 at one end of the settlement monitoring system 1, and a water pump 42 may be provided on the water filling pipe 41, and the upstream end of the water filling pipe 41 may be connected to the water storage tank 43. The water filling pipe 41 may also be connected to the liquid outlet 1113 of the test shell 111 at the other end of the settlement monitoring system 1, and the downstream end of the water filling pipe 41 may be connected to the drainage tank 44.

[0178] Since the test shells 111 of the sedimentation monitoring system 1 are connected to each other through the water pipes 121, the water in the water storage tank 43 can be driven by the water pump 42 to pass through the water filling pipe 41, multiple test shells 111, multiple water pipes 121, and the water filling pipe 41 in sequence and flow into the drainage tank 44 to discharge the gas in the water pipe 121.

[0179] It should be understood that the process of filling and exhausting water needs to last for a period of time, which can be 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, etc., which is not specifically limited here, and the time required to exhaust the gas in the water pipe 121 shall prevail.

[0180] It should be understood that, since the liquid level test head 112 is electrically connected to the collection device 20 , there may be a problem of damaging the liquid level test head 112 during the water filling process.

[0181] Therefore, in some embodiments, the sedimentation test mechanism 11 may further include a plurality of cover plates 113, which are detachably disposed on the test housing 111. When it is necessary to perform step S5, the liquid level test head 112 may be first removed from the test housing 111, and the cover plate 113 may be installed on the test housing 111 to block the position of the liquid level test head 112. After step S5 is completed, the cover plate 113 is removed and the liquid level test head 112 is installed.

[0182] like Fig.15 As shown, in some embodiments, step S4 may include:

[0183] Step S41, according to the elevation changes at multiple measuring positions, the position data of multiple measuring positions, and the size data of each pair of wheels in the steam turbine unit 2, respectively obtain the plane deviations between each adjacent rotor in the steam turbine unit 2.

[0184] Step S42, respectively obtaining the circumferential deviations between adjacent rotors in the steam turbine unit 2 according to the elevation changes at the multiple measuring positions, the position data at the multiple measuring positions, and the position data of each pair of wheels in the steam turbine unit.

[0185] Step S43: Combining the plane deviation between adjacent rotors and the circumferential deviation between adjacent rotors to form the center deviation of the shaft system of the steam turbine unit.

[0186] like Fig.16 As shown, in some embodiments, step S41 may include:

[0187] Step S411, based on the elevation changes at multiple measurement positions, the position data of multiple measurement positions, and the size data of each pair of wheels in the steam turbine unit 2, respectively obtain the elevation changes of the adjacent measurement positions on the front and rear sides of each rotor in two adjacent rotors, the distance between the adjacent measurement positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor.

[0188] Step S412, obtaining the plane deviation of the two adjacent rotors according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor.

[0189] It should be understood that, since the steam turbine unit 2 includes multiple rotors connected end to end, there are multiple groups of adjacent rotors, and the plane deviations of multiple adjacent rotors can be obtained. The following takes one group of adjacent rotors as an example to further illustrate step S41:

[0190] Read also Figure 8, the rotor of the first low-pressure cylinder 203 in the steam turbine unit 2 is now defined as the first rotor 100, and the rotor of the second low-pressure cylinder 204 is defined as the second rotor 200. The pair of wheels of the first rotor 100 away from the second rotor 200 is the first pair of wheels 2081, the pair of wheels between the first rotor 100 and the second rotor 200 is the second pair of wheels 2082, and the pair of wheels of the second rotor 200 away from the first rotor 100 is the third pair of wheels 2083. The bearings on both sides of the first rotor 100 are the first bearing 2071 and the second bearing 2072, respectively, and the bearings on both sides of the second rotor 200 are the third bearing 2073 and the fourth bearing 2074, respectively, wherein the second bearing 2072 and the third bearing 2073 are located between the first rotor 100 and the second rotor 200.

[0191] It should be understood that the positional relationship referred to in the "front and rear sides" can be based on the extension direction of the shaft system of the steam turbine unit 2. In the embodiment shown in the figure, the extension direction of the center line M can be used as the reference.

[0192] For example, if along the extension direction of the center line M, the first rotor 100 can be regarded as the front rotor, and the second rotor 200 can be regarded as the rear rotor. Then the diameter of the rear adjacent pair of wheels of the front rotor can be understood as the diameter of the second pair of wheels 2082. The diameter of the front adjacent pair of wheels of the rear rotor can be understood as the diameter of the second pair of wheels 2082.

[0193] Since the measuring positions are set corresponding to the bearings, the elevation change of the adjacent measuring positions on the front and rear sides of each rotor can be understood as the elevation change of the first bearing 2071, the second bearing 2072, the third bearing 2073, and the fourth bearing 2074. The distance between the adjacent measuring positions on the front and rear sides of each rotor can be understood as the distance from the first bearing 2071 to the second bearing 2072 (i.e. Figure 8 L1 in the figure), and the distance from the third bearing 2073 to the fourth bearing 2074 (i.e. Figure 8 in L2).

[0194] exist Figure 8 In the illustrated embodiment, the measurement position corresponding to the first bearing 2071 is defined as the calibration point, and the elevation change at the first bearing 2071 can be regarded as zero.

[0195] In some embodiments, the plane deviation of two adjacent rotors in step S412 can be obtained by formula 1:

[0196]

[0197] Wherein, ΔP is the plane deviation between the two rotors. In the above example, it is the plane deviation between the first rotor 100 and the second rotor 200 .

[0198] ΔP0 is the initial plane deviation between the two rotors.

[0199] Δi11 is the elevation change of the adjacent measuring position on the front side of the front rotor. In the above example, it is the elevation change at the position where the first bearing 2071 is located.

[0200] D 12 It is the diameter of the adjacent pair of wheels at the rear side of the front rotor. In the above example, it is the diameter of the second pair of wheels 2082.

[0201] L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor. In the above example, it is the distance from the first bearing 2071 to the second bearing 2072 .

[0202] Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor. In the above example, it is the elevation change at the position where the second bearing 2072 is located.

[0203] Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor. In the above example, it is the elevation change at the position where the third bearing 2073 is located.

[0204] D 21 It is the diameter of the front adjacent pair of wheels of the rear rotor. In the above example, it is the diameter of the second pair of wheels 2082.

[0205] L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor, i.e., the distance from the third bearing 2073 to the fourth bearing 2074 in the above example.

[0206] Δi 22 is the elevation change of the adjacent measuring position at the rear side of the rear rotor. In the above example, it is the elevation change at the position where the fourth bearing 2074 is located.

[0207] It should be understood that the initial plane deviation ΔP0 between two adjacent rotors can be understood as the plane deviation between the adjacent rotors after the last adjustment of the shaft center of the steam turbine unit 2, or can be understood as the target plane deviation to be achieved during the adjustment after this measurement, etc. Its value can be zero or non-zero, and is not specifically limited here.

[0208] like Fig.16 As shown, in some embodiments, step S42 may include:

[0209] Step S421, based on the elevation changes at multiple measurement positions, the position data of multiple measurement positions, and the position data of each pair of wheels in the steam turbine unit 2, respectively obtain the elevation changes of the adjacent measurement positions on the front and rear sides of each rotor in two adjacent rotors, the distance between the adjacent measurement positions on the front and rear sides of each rotor, the distance from the adjacent measurement position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measurement position on the front side of the rear rotor to the adjacent pair of wheels on the front side.

[0210] Step S422, obtaining the circumferential deviation of the two adjacent rotors according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measuring position on the front side of the rear rotor to the adjacent pair of wheels on the front side,

[0211] Below is still Figure 8 The example shown further illustrates step S42:

[0212] exist Figure 8 In the embodiment shown, the distance between the adjacent measuring positions on the front and rear sides of each rotor can be understood as the distance from the first bearing 2071 to the second bearing 2072 (i.e. Figure 8 L1 in the figure), and the distance from the third bearing 2073 to the fourth bearing 2074 (i.e. Figure 8 The distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side can be understood as the distance from the second bearing 2072 to the second pair of wheels 2082 (i.e. Figure 8 The distance from the adjacent measuring position on the front side of the rear rotor to the adjacent pair of wheels on the front side can be understood as the distance from the third bearing 2073 to the second pair of wheels 2082 (i.e. Figure 8 The elevation changes of the adjacent measuring positions on the front and rear sides of each rotor can be understood as the elevation changes of the first bearing 2071, the second bearing 2072, the third bearing 2073, and the fourth bearing 2074.

[0213] In some embodiments, the circumferential deviation of two adjacent rotors in step S422 can be obtained by formula 2:

[0214]

[0215] Wherein, ΔC is the circumferential deviation between the two rotors. In the above example, it is the circumferential deviation between the first rotor 100 and the second rotor 200 .

[0216] ΔC0 is the initial circumferential deviation between the two rotors.

[0217] Δi 11 is the elevation change of the adjacent measuring position on the front side of the front rotor. In the above example, it is the elevation change at the position where the first bearing 2071 is located.

[0218] L 122 It is the distance from the rear adjacent measuring position of the front rotor to the rear adjacent pair of wheels. In the above example, it is the distance from the second bearing 2072 to the second pair of wheels 2082.

[0219] L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor. In the above example, it is the distance from the first bearing 2071 to the second bearing 2072 .

[0220] Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor. In the above example, it is the elevation change at the position where the second bearing 2072 is located.

[0221] Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor. In the above example, it is the elevation change at the position where the third bearing 2073 is located.

[0222] L 211 It is the distance from the front adjacent measuring position of the rear rotor to the front adjacent pair of wheels. In the above example, it is the distance from the third bearing 2073 to the second pair of wheels 2082.

[0223] L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor, i.e., the distance from the third bearing 2073 to the fourth bearing 2074 in the above example.

[0224] Δi 22 is the elevation change of the adjacent measuring position at the rear side of the rear rotor. In the above example, it is the elevation change at the position where the fourth bearing 2074 is located.

[0225] It should be understood that the initial circumferential deviation ΔC0 between two adjacent rotors can be understood as the circumferential deviation between the adjacent rotors after the last adjustment of the shaft center of the steam turbine unit 2, or can be understood as the target circumferential deviation to be achieved during the adjustment after this measurement, etc. Its value can be zero or non-zero, and is not specifically limited here.

[0226] It should be understood that, except for the elevation change measured in step S3, the other various distance values, diameter values, etc. are all values ​​that the steam turbine unit 2 has when it leaves the factory and can be directly obtained without specific limitation here.

[0227] exist Figures 1 to 3In the steam turbine unit 2 shown, there are four groups of adjacent rotors, namely, the rotor of the high-pressure cylinder 202 and the rotor of the first low-pressure cylinder 203, the rotor of the first low-pressure cylinder 203 and the rotor of the second low-pressure cylinder 204, the rotor of the second low-pressure cylinder 204 and the rotor of the generator 205, and the rotor of the generator 205 and the rotor of the exciter 206. By obtaining the plane deviation and circumferential deviation of each group of adjacent rotors in accordance with the above steps, the shaft center deviation of the steam turbine unit 2 can be obtained.

[0228] The present application will be further described below through a specific embodiment:

[0229] exist Figure 1 In the steam turbine unit 2 shown, the data of the relevant distances and diameters of each rotor are shown in Table 1:

[0230] Table 1

[0231]

[0232] The measurement position corresponding to the bearing 207 on the front side of the rotor of the high-pressure cylinder 202 is set as the calibration point. Then, through steps S1 to S3, the elevation changes at each measurement position can be obtained as shown in Table 2:

[0233] Table 2

[0234]

[0235] In this specific embodiment, it is assumed that there is no initial center deviation (it can also be understood that it is hoped that there is no deviation after adjustment). Then the initial deviation between adjacent rotors is shown in Table 3:

[0236] Table 3

[0237]

[0238] Using the above data, through step S4, the center deviation between adjacent rotors can be obtained as shown in Table 4:

[0239] Table 4

[0240]

[0241]

[0242] The plane deviation and circumferential deviation between adjacent rotors obtained in Table 4 together constitute Figure 1 The shaft center deviation of the steam turbine unit 2 is shown.

[0243] The shaft center deviation shown in the measured figure can be eliminated or reduced by adjusting the bearing 207 and / or the support spring 210 in the steam turbine unit 2, so as to achieve the adjustment of the shaft center without disassembling the wheel 208.

[0244] Subsequently, by adopting the existing technology, the wheel pairs 208 between each rotor are removed respectively, and a dial indicator or a gauge block is installed on the removed wheel pairs 208. By rotating the rotor 208, the data of the wheel pairs 208 are measured every 90° to verify the measurement method constructed in this application. The final result obtained meets the error requirement with the result obtained in this application. The method constructed according to this application is applied in the overhaul process, and the result meets the accuracy requirement, can realize the demand for accurate measurement, and has a good use effect.

[0245] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of the claims of the present application.

Claims

1. A method for measuring the center deviation of a steam turbine shaft system, characterized in that: include: Select multiple measuring positions along the shaft system of the steam turbine unit on the foundation platform of the steam turbine unit; Installing a settlement monitoring system on the basic platform; Obtaining the elevation change at each of the measuring positions within a measuring time period; The center deviation of the steam turbine unit shaft system is obtained based on the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the size and position data of each pair of wheels in the steam turbine unit.

2. The method for measuring the center deviation of the shaft system of a steam turbine unit according to claim 1, characterized in that: The sedimentation monitoring system comprises a plurality of sedimentation testing mechanisms and at least one connecting mechanism, wherein the sedimentation testing mechanisms form a testing cavity for containing a testing liquid; The step of installing the settlement monitoring system on the basic platform comprises: Adjusting the flatness of the base platform at each of the measuring positions to be within a first preset range; At least one settlement testing mechanism is installed at each of the measuring positions; The test chambers of two adjacent sedimentation test mechanisms are connected via a connecting mechanism.

3. The method for measuring the center deviation of the steam turbine shaft system according to claim 2, characterized in that: The step of adjusting the flatness of the base platform at each of the measuring positions to be within a first preset range includes: The surface of the base platform at each of the measuring positions is polished so that the flatness of the base platform at each of the measuring positions is within the first preset range.

4. The method for measuring the center deviation of the steam turbine shaft system according to claim 2, characterized in that: At least one settlement testing mechanism is installed at each of the measuring positions, including: Adjusting the absolute elevation of each of the measuring positions so that the difference between the absolute elevations of any two of the measuring positions is within a second preset range; At least one settlement testing mechanism is installed at each measuring position after the absolute elevation is adjusted.

5. The method for measuring the center deviation of the steam turbine shaft system according to claim 2, characterized in that: After the step of installing the settlement monitoring system on the base platform and before the step of obtaining the elevation change at each of the measurement positions within the measurement time period, the method further includes: The settlement monitoring system is filled with water and vented.

6. The method for measuring the center deviation of the steam turbine shaft system according to claim 5, characterized in that: The connecting mechanism includes an air pipe and a water pipe, the air pipe is used to connect the test chambers of two adjacent sedimentation test mechanisms, and the water pipe is used to connect the test chambers of two adjacent sedimentation test mechanisms; The step of filling the settlement monitoring system with water and exhausting the air comprises: Blocking the air pipe between each two adjacent sedimentation test mechanisms; Connecting the settlement monitoring system to a water source so as to fill the settlement monitoring system with water through the water source and discharge the gas in the water pipe; The settlement monitoring system is disconnected from the water source to stop filling the settlement monitoring system with water through the water source, and the air pipe between each adjacent two settlement testing mechanisms is unblocked.

7. The method for measuring the center deviation of the shaft system of a steam turbine unit according to claim 2, characterized in that: The step of obtaining the elevation change at each of the measurement positions within the measurement time period includes: At an initial moment of the measurement time period, obtaining a first liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions; At the end time of the measurement time period, obtaining a second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions; The elevation change at each of the measuring positions within a measuring time period is obtained through the first liquid level value and the second liquid level value at each of the measuring positions.

8. The method for measuring the center deviation of the steam turbine shaft system according to claim 7, characterized in that: The measuring positions are arranged in one-to-one correspondence with the bearings of the steam turbine unit; the measuring positions include two measuring points, the two measuring points are symmetrically distributed on both sides of the bearing, and the connecting line of the two measuring points is perpendicular to the center line of the bearing; a settlement test mechanism is installed on each of the measuring points; The step of obtaining the first liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions at the initial moment of the measurement time period includes: At the initial moment of the measurement time period, obtaining the third liquid level value in the test cavity of the sedimentation test mechanism at the two measurement points of each measurement position; obtaining the first liquid level value in the test cavity of the sedimentation test mechanism at each measurement position by averaging the third liquid level values ​​of the two measurement points; The step of obtaining the second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions at the end time of the measurement time period includes: At the end time of the measurement time period, the fourth liquid level value in the test cavity of the sedimentation test mechanism at the two measurement points of each of the measurement positions is obtained; and the second liquid level value in the test cavity of the sedimentation test mechanism at each of the measurement positions is obtained by averaging the fourth liquid level values ​​of the two measurement points.

9. The method for measuring the center deviation of the shaft system of a steam turbine unit according to any one of claims 1 to 8, characterized in that: The step of obtaining the shaft center deviation of the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size and position data of each pair of wheels in the steam turbine unit comprises: According to the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the size data of each pair of wheels in the steam turbine unit, respectively obtaining the plane deviations between each adjacent rotor in the steam turbine unit; According to the elevation changes at the multiple measuring positions, the position data of the multiple measuring positions, and the position data of each pair of wheels in the steam turbine unit, respectively obtaining the circumferential deviations between each adjacent rotor in the steam turbine unit; The center deviation of the turbine unit shaft system is formed by combining the plane deviation between adjacent rotors and the circumferential deviation between adjacent rotors.

10. The method for measuring the center deviation of the steam turbine shaft system according to claim 9, characterized in that: The step of respectively obtaining the plane deviations between adjacent rotors in the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size data of each pair of wheels in the steam turbine unit comprises: According to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the size of each pair of wheels in the steam turbine unit, respectively obtain the elevation changes of the measurement positions adjacent to the front and rear sides of each rotor in two adjacent rotors, the distance between the measurement positions adjacent to the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor; The plane deviation of the two adjacent rotors is obtained according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor.

11. The method for measuring the center deviation of the steam turbine shaft system according to claim 10, characterized in that: The step of obtaining the plane deviation of the two adjacent rotors according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor in the two adjacent rotors, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the diameter of the adjacent pair of wheels on the rear side of the front rotor, and the diameter of the adjacent pair of wheels on the front side of the rear rotor comprises: Obtaining the plane deviation of the two adjacent rotors according to Formula 1; Where ΔP is the plane deviation between the two rotors; ΔP0 is the initial plane deviation between the two rotors; Δi 11 is the elevation change of the adjacent measuring position on the front side of the front rotor; D 12 is the diameter of the adjacent pair of wheels on the rear side of the front rotor; L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor; Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor; Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor; D 21 is the diameter of the adjacent pair of wheels on the front side of the rear rotor; L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor; Δi 22 It is the elevation change of the adjacent measuring position on the rear side of the rear rotor.

12. The method for measuring the center deviation of the steam turbine shaft system according to claim 9, characterized in that: The method of obtaining the circumferential deviations between adjacent rotors in the steam turbine unit according to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the position data of each pair of wheels in the steam turbine unit comprises: According to the elevation changes at the multiple measurement positions, the position data of the multiple measurement positions, and the position data of each pair of wheels in the steam turbine unit, respectively obtain the elevation changes of the measurement positions adjacent to the front and rear sides of each rotor in two adjacent rotors, the distance between the measurement positions adjacent to the front and rear sides of each rotor, the distance from the measurement position adjacent to the rear side of the front rotor to the adjacent pair of wheels, and the distance from the measurement position adjacent to the front side of the rear rotor to the adjacent pair of wheels; The circumferential deviation of the two adjacent rotors is obtained based on the elevation change of the adjacent measuring positions on the front and rear sides of each rotor, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measuring position on the front side of the rear rotor to the adjacent pair of wheels on the front side.

13. The method for measuring the center deviation of the steam turbine shaft system according to claim 12, characterized in that: The method of obtaining the circumferential deviation of the two adjacent rotors according to the elevation change of the adjacent measuring positions on the front and rear sides of each rotor of the two adjacent rotors, the distance between the adjacent measuring positions on the front and rear sides of each rotor, the distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side, and the distance from the adjacent measuring position on the front side of the rear rotor to the adjacent pair of wheels on the front side, comprises: Obtain the circumferential deviation of the two adjacent rotors according to Formula 2; Where ΔC is the circumferential deviation between the two rotors; ΔC0 is the initial circumferential deviation between the two rotors; Δi 11 is the elevation change of the adjacent measuring position on the front side of the front rotor; L 122 The distance from the adjacent measuring position on the rear side of the front rotor to the adjacent pair of wheels on the rear side; L1 is the distance between adjacent measurement positions on the front and rear sides of the front rotor; Δi 12 is the elevation change of the adjacent measuring position on the rear side of the front rotor; Δi 21 is the elevation change of the adjacent measuring position on the front side of the rear rotor; L 211 The distance from the front adjacent measuring position of the rear rotor to the front adjacent pair of wheels; L2 is the distance between adjacent measurement positions on the front and rear sides of the rear rotor; i 22 It is the elevation change of the adjacent measuring position on the rear side of the rear rotor.

14. The method for measuring the center deviation of the shaft system of a steam turbine unit according to any one of claims 1 to 8, characterized in that: The measuring positions are arranged in one-to-one correspondence with the bearings of the steam turbine unit, and the connecting line between the measuring position and the corresponding bearing is perpendicular to the center line of the bearing.

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