Steam turbine rotor bending measuring device

Abstract

The invention provides a steam turbine rotor bending measuring device. The steam turbine rotor bending measuring device comprises a measuring unit, a data collector, a Bluetooth unit and a display unit. The measuring unit comprises a magnetic support and a capacitance displacement sensor, the capacitance displacement sensor is installed on the magnetic support, and the measuring face of the capacitance displacement sensor is attached to a sub-measuring position of a certain measuring point of the steam turbine rotor. The data collector is connected with the capacitance displacement sensor; the data collector is in signal connection with the display unit through the Bluetooth unit, and the Bluetooth unit is used for transmitting the displacement signal to the display unit; the plurality of measuring units are distributed along the axial direction of the steam turbine rotor, and each measuring unit corresponds to a measuring point of the steam turbine rotor; and the plurality of sub-measurement positions are uniformly distributed along the circumferential direction of the steam turbine rotor. One technical effect of the invention is that not only is the measurement efficiency improved, but also the measurement precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbines, and in particular relates to a steam turbine rotor bending measurement device. Background Art

[0002] Steam turbine generator is one of the core equipment of thermal power plants, which can convert the heat energy of steam into electrical energy. The rotor of the steam turbine rotates at a speed of up to 3000r / min during operation, so the rotor bending value is required to be high, generally requiring the rotor bending value to be ≤0.02mm. If the rotor bending value exceeds the standard, the high-speed running steam turbine rotor will vibrate and cause the steam turbine unit to shut down unplanned. Therefore, when overhauling the steam turbine, it is necessary to accurately measure whether the steam turbine rotor bending value exceeds the standard.

[0003] At present, the commonly used method for measuring the bending value of steam turbine rotors is to use the mechanical dial indicator measurement method. On the one hand, when the mechanical dial indicator measures the rotor bending, manual measurement data is required, which has the problems of long operation time and low measurement efficiency. On the other hand, when manually reading the mechanical dial indicator pointer graduation value, there is a problem of large reading error. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution for a steam turbine rotor bending measurement device.

[0005] According to a first aspect of the present invention, there is provided a device for measuring the bending of a steam turbine rotor, comprising:

[0006] A measuring unit, the measuring unit comprising a magnetic bracket and a capacitive displacement sensor, the capacitive displacement sensor being mounted on the magnetic bracket, and a measuring surface of the capacitive displacement sensor being in contact with a sub-measurement position of a certain measuring point of a steam turbine rotor, the capacitive displacement sensor being used to measure a displacement signal when the steam turbine rotor rotates, and converting the displacement signal into a voltage signal;

[0007] A data collector, the data collector is connected to the capacitive displacement sensor;

[0008] A Bluetooth unit and a display unit, wherein the data collector is connected to the display unit via the Bluetooth unit, and the Bluetooth unit is used to transmit the voltage signal to the display unit;

[0009] The plurality of measuring units are distributed along the axial direction of the steam turbine rotor, and each of the measuring units corresponds to a measuring point of the steam turbine rotor; each measuring point has a plurality of sub-measurement positions, and the plurality of sub-measurement positions are evenly distributed along the circumferential direction of the steam turbine rotor;

[0010] The turbine rotor at the preset position rotates, and the bending data of each sub-measurement position is measured by the capacitive displacement sensor to form a displacement signal. The displacement signal of each capacitive displacement sensor is plotted into a rotor bending curve, and the maximum bending value of the turbine rotor is calculated.

[0011] Optionally, each measuring point has eight sub-measurement positions.

[0012] Optionally, the capacitive displacement sensor has a measurement accuracy of 1 um and a measurement range of 5 mm-10 mm.

[0013] Optionally, the steam turbine rotor bending measurement device further comprises a magnetic base;

[0014] The magnetic base is disposed at one end of the magnetic bracket away from the capacitive displacement sensor, and the magnetic base is adsorbed on a metal object to fix the magnetic bracket.

[0015] Optionally, the capacitive displacement sensor includes a first electrode plate, a second electrode plate and a dielectric plate;

[0016] The first electrode plate and the second electrode plate form a capacitor structure;

[0017] One end of the dielectric plate is fitted to a sub-measurement position of a certain measurement point of the steam turbine rotor, and the other end extends between the first electrode plate and the second electrode plate;

[0018] When the turbine rotor is displaced, the capacitance of the capacitor structure is changed by the movement of the dielectric plate, so as to measure the displacement of the turbine rotor.

[0019] Optionally, the Bluetooth unit is arranged inside the data collector.

[0020] Optionally, the transmission distance of the Bluetooth unit is 10 meters.

[0021] Optionally, the display unit is a tablet computer with a built-in Bluetooth receiving function.

[0022] Optionally, the display unit receives the voltage signal transmitted by the data collector via a 485 communication protocol.

[0023] Optionally, a battery is disposed inside the data collector.

[0024] A technical effect of the present invention is:

[0025] In the embodiment of the present application, the bending data of each sub-measurement position is measured by a capacitive displacement sensor to form a displacement signal, the displacement signal of each capacitive displacement sensor is plotted as a rotor bending curve, and the maximum bending value of the turbine rotor is calculated.

[0026] On the one hand, the steam turbine rotor bending measuring device realizes the digital measurement of the steam turbine rotor bending, shortens the operation time of manually measuring the steam turbine rotor bending value, and improves the measurement efficiency.

[0027] On the other hand, the turbine rotor bending measurement device adopts precision measurement technology, which eliminates the reading and calculation errors of the staff, improves the measurement accuracy, and effectively avoids shutdown failures caused by large vibration of the turbine rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a steam turbine rotor bending measurement device according to an embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a sub-measurement position of a steam turbine rotor bending measurement device according to an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of a capacitive displacement sensor of a steam turbine rotor bending measurement device according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a rotor bending curve drawn by a device for measuring the bending of a steam turbine rotor according to an embodiment of the present invention;

[0032] Figure 5 A reference diagram of the use status of a steam turbine rotor bending measurement device according to an embodiment of the present invention.

[0033] In the figure: 1. magnetic bracket; 2. capacitive displacement sensor; 21. first electrode plate; 22. second electrode plate; 23. dielectric plate; 3. data acquisition device; 4. Bluetooth unit; 5. display unit; 6. turbine rotor; 7. sub-measurement position. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0035] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0036] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] According to a first aspect of the present invention, see Figures 1 to 3 , provides a steam turbine rotor bending measurement device, comprising:

[0040] A measuring unit, the measuring unit comprising a magnetic bracket 1 and a capacitive displacement sensor 2, the capacitive displacement sensor 2 being mounted on the magnetic bracket 1, and a measuring surface of the capacitive displacement sensor 2 being in contact with a sub-measurement position 7 of a certain measuring point of a steam turbine rotor 6, the capacitive displacement sensor 2 being used to measure a displacement signal when the steam turbine rotor 6 rotates, and converting the displacement signal into a voltage signal;

[0041] A data collector 3, wherein the data collector 3 is connected to the capacitive displacement sensor 2;

[0042] A Bluetooth unit 4 and a display unit 5, wherein the data collector 3 is connected to the display unit 5 by signal via the Bluetooth unit 4, and the Bluetooth unit 4 is used to transmit the voltage signal to the display unit 5;

[0043] The plurality of measuring units are distributed along the axial direction of the steam turbine rotor 6, and each of the measuring units corresponds to a measuring point of the steam turbine rotor 6; each measuring point has a plurality of sub-measurement positions 7, and the plurality of sub-measurement positions 7 are evenly distributed along the circumferential direction of the steam turbine rotor 6;

[0044] The turbine rotor 6 at the preset position rotates, and the bending data of each sub-measurement position 7 is measured by the capacitive displacement sensor 2 to form a displacement signal, the displacement signal of each capacitive displacement sensor 2 is plotted as a rotor bending curve, and the maximum bending value of the turbine rotor 6 is calculated.

[0045] Exemplarily, the displacement signal is plotted into a turbine rotor bending curve using dedicated software, and the maximum bending value of the turbine rotor 6 is calculated, so that the turbine rotor bending value can be accurately measured.

[0046] In the embodiment of the present application, the bending data of each sub-measurement position 7 is measured by the capacitive displacement sensor 2 to form a displacement signal, the displacement signal of each capacitive displacement sensor 2 is plotted as a rotor bending curve, and the maximum bending value of the turbine rotor 6 is calculated.

[0047] On the one hand, the steam turbine rotor bending measuring device realizes the digital measurement of the steam turbine rotor bending, shortens the operation time of manually measuring the steam turbine rotor bending value, and improves the measurement efficiency.

[0048] On the other hand, the turbine rotor bending measurement device adopts precision measurement technology, which eliminates the reading and calculation errors of the staff, improves the measurement accuracy, and effectively avoids shutdown failures caused by large vibration of the turbine rotor.

[0049] Optionally, each measuring point has eight sub-measuring positions 7 .

[0050] In the above embodiment, eight sub-measurement positions 78 equally divide the turbine rotor 6 as measurement positions, and the turbine rotor 6 is rotated. At each measurement position (i.e., sub-measurement position 7), the capacitive displacement sensor 2 converts the surface displacement signal of the turbine rotor 6 into a voltage signal and transmits it to the digital quantity collector. The data collector 3 transmits the displacement signal to the display unit 5 via the Bluetooth unit 4, which helps to accurately measure the bending value of the turbine rotor 6.

[0051] Optionally, the capacitive displacement sensor 2 has a measurement accuracy of 1 um and a measurement range of 5 mm-10 mm, which makes the measurement accuracy and measurement range of the capacitive displacement sensor 2 more reasonable, and helps to accurately measure the bending value of the steam turbine rotor 6.

[0052] Optionally, the steam turbine rotor bending measurement device further comprises a magnetic base;

[0053] The magnetic base is disposed at one end of the magnetic bracket 1 away from the capacitive displacement sensor 2 , and the magnetic base is adsorbed on a metal object to fix the magnetic bracket 1 .

[0054] In the above embodiment, the magnetic base makes the fixing method of the magnetic bracket 1 and the capacitive displacement sensor 2 relatively simple, which is helpful for measuring the bending value of the steam turbine rotor 6.

[0055] Alternatively, see Figure 3 , the capacitive displacement sensor 2 includes a first electrode plate 21, a second electrode plate 22 and a dielectric plate 23;

[0056] The first electrode plate 21 and the second electrode plate 22 form a capacitor structure;

[0057] One end of the dielectric plate 23 is in contact with a sub-measurement position 7 of a certain measurement point of the steam turbine rotor 6, and the other end extends between the first pole plate 21 and the second pole plate 22;

[0058] When the steam turbine rotor 6 is displaced, the capacitance of the capacitor structure is changed by the movement of the dielectric plate 23 , so as to measure the displacement of the steam turbine rotor 6 .

[0059] In the above embodiment, the capacitive displacement sensor 2 helps to accurately measure the displacement signal of each measuring point of the steam turbine rotor 6 .

[0060] Optionally, the Bluetooth unit 4 is arranged inside the data collector 3. This helps to simplify the structure of the steam turbine rotor bending measurement device and better ensure the stability of the connection relationship between various components.

[0061] Optionally, the transmission distance of the Bluetooth unit 4 is 10 meters, which makes the transmission distance of the Bluetooth unit 4 more reasonable.

[0062] Optionally, the display unit 5 is a tablet computer with a built-in Bluetooth receiving function, which enables the display unit 5 to accurately receive the voltage signal transmitted by the data collector 3 .

[0063] Optionally, the display unit 5 receives the voltage signal transmitted by the data collector 3 through the 485 communication protocol. This enables the display unit 5 to stably receive the voltage signal transmitted by the data collector 3.

[0064] Optionally, a battery is provided inside the data collector 3, which better ensures the safe and stable operation of the data collector 3.

[0065] It should be noted that the measurement process of the steam turbine rotor bending measurement device is as follows:

[0066] First, measurement preparation: manually divide the six sections of the turbine rotor into eight equal parts, attach color tapes at the equal parts, and set up color code sensors, such as Figure 2 shown.

[0067] The 10 capacitive displacement sensors 2 are numbered: P1, P2, P3, P4, P5, ... P10, and the 10 capacitive displacement sensors 2 are evenly arranged along the axial direction of the turbine rotor 6 in the order of the numbers and contact the measured turbine rotor 6. The capacitive displacement sensors 2 are turned on and the display of the capacitive displacement sensors 2 is set to zero.

[0068] Next, the capacitive displacement sensor 2 is paired with the host computer program through the Bluetooth unit 4, and the actual measurement data of 10 capacitive displacement sensors 2 are displayed on the host computer's tested software interface, 0.000 (thousandths), unit: mm (or tenths, unit: 0.0um).

[0069] Next, start the measurement: manually rotate the steam turbine rotor continuously for 6360°.

[0070] Next, the laser color mark sensor (i.e., the capacitive displacement sensor 2) outputs a switch signal at each equally divided point (i.e., the sub-measurement position 7), and transmits the signal to the measurement software, so that the measurement software collects data at each equally divided position. A total of 8 sets of data are collected for each cross section, and the ninth set of data returns to zero. When the collected data changes, the measurement data is displayed in real time and assisted by a bar graph, such as Figure 5 shown.

[0071] Again, the measurement results: the measurement data collected by 10 capacitive displacement sensors 2 at 8 equally divided points are tabulated, and the bending vectors and bending values ​​of the 8 equally divided points are calculated, as shown in Table 1. Unit: silk, 0.01 mm.

[0072] Table 1

[0073]

[0074] It should be noted that the displacement signal includes a bending vector and a bending value. The bending vector calculation method is: subtract the opposite values ​​of equally divided points, such as the bending vector of the P1 capacitive displacement sensor in the direction 1-5 = 23-50 = -23 wire.

[0075] Bending value calculation method: 1 / 2 of the bending vector, such as the maximum bending value of the P1 capacitive displacement sensor in the 1-5 direction = -23 / 2 = -11.5 wires.

[0076] Next, see Figure 4 , automatically draw the bending curve: the software draws the bending curve according to the bending value, and automatically draws the bending curve (Note: because the bending value of the P4 measuring point in the 1-5 orientation is the largest, the bending value in the 1-5 orientation is extracted as the vertical coordinate, and the horizontal coordinate is the evenly distributed measuring points).

[0077] Finally, the bending analysis was performed with manual wiring. The actual maximum bending value was 20 wires, the bending position was between measuring points P3-P4, and the bending orientation was 1-5.

[0078] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A steam turbine rotor bending measurement device, characterized in that: include: A measuring unit, the measuring unit comprising a magnetic bracket and a capacitive displacement sensor, the capacitive displacement sensor being mounted on the magnetic bracket, and a measuring surface of the capacitive displacement sensor being in contact with a sub-measurement position of a certain measuring point of a steam turbine rotor, the capacitive displacement sensor being used to measure a displacement signal when the steam turbine rotor rotates, and converting the displacement signal into a voltage signal; A data collector, the data collector is connected to the capacitive displacement sensor; A Bluetooth unit and a display unit, wherein the data collector is connected to the display unit via the Bluetooth unit, and the Bluetooth unit is used to transmit the voltage signal to the display unit; The plurality of measuring units are distributed along the axial direction of the steam turbine rotor, and each of the measuring units corresponds to a measuring point of the steam turbine rotor; each measuring point has a plurality of sub-measurement positions, and the plurality of sub-measurement positions are evenly distributed along the circumferential direction of the steam turbine rotor; The turbine rotor at the preset position rotates, and the bending data of each sub-measurement position is measured by the capacitive displacement sensor to form a displacement signal. The displacement signal of each capacitive displacement sensor is plotted into a rotor bending curve, and the maximum bending value of the turbine rotor is calculated.

2. The steam turbine rotor bending measuring device according to claim 1, characterized in that: Each measuring point has eight sub-measuring locations.

3. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The capacitive displacement sensor has a measurement accuracy of 1um and a measurement range of 5mm-10mm.

4. The steam turbine rotor bending measuring device according to claim 1, characterized in that: Also includes magnetic mount; The magnetic base is disposed at one end of the magnetic bracket away from the capacitive displacement sensor, and the magnetic base is adsorbed on a metal object to fix the magnetic bracket.

5. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The capacitive displacement sensor comprises a first electrode plate, a second electrode plate and a dielectric plate; The first electrode plate and the second electrode plate form a capacitor structure; One end of the dielectric plate is fitted to a sub-measurement position of a certain measurement point of the steam turbine rotor, and the other end extends between the first electrode plate and the second electrode plate; When the turbine rotor is displaced, the capacitance of the capacitor structure is changed by the movement of the dielectric plate, so as to measure the displacement of the turbine rotor.

6. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The Bluetooth unit is arranged inside the data collector.

7. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The transmission distance of the Bluetooth unit is 10 meters.

8. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The display unit is a tablet computer with a built-in Bluetooth receiving function.

9. The steam turbine rotor bending measuring device according to claim 1, characterized in that: The display unit receives the voltage signal transmitted by the data collector through the 485 communication protocol.

10. The steam turbine rotor bending measuring device according to claim 1, characterized in that: A battery is arranged inside the data collector.

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