Steam turbine rotor bending measurement apparatus

Abstract

A steam turbine rotor bending measurement apparatus, comprising measurement units, a data collector (3), a Bluetooth unit (4), and a display unit (5). Each measurement unit comprises a magnetic support (1) and a capacitive displacement sensor (2), the capacitive displacement sensor (2) is mounted on the magnetic support (1), and a measurement surface of the capacitive displacement sensor (2) is in contact with a measurement sub-position (7) of a certain measurement point of a steam turbine rotor (6); the data collector (3) is connected to the capacitive displacement sensor (2); the data collector (3) is in signal connection with the display unit (5) by means of the Bluetooth unit (4), and the Bluetooth unit (4) is used for transmitting a displacement signal to the display unit (5); a plurality of measurement units are distributed in the axial direction of the steam turbine rotor (6), and each measurement unit corresponds to one measurement point of the steam turbine rotor (6); and a plurality of measurement sub-positions (7) are uniformly distributed in the circumferential direction of the steam turbine rotor (6). The above solution not only improves the measurement efficiency, but also improves the measurement accuracy.

Description

A steam turbine rotor bending measuring device Technical Field

[0001] This invention belongs to the field of steam turbine technology, and specifically relates to a steam turbine rotor bending measuring device. Background Technology

[0002] Steam turbine generators are one of the core pieces of equipment in thermal power plants, converting the thermal energy of steam into electrical energy. The turbine rotor operates at speeds up to 3000 r / min, therefore, strict requirements are placed on the rotor bending value, generally requiring it to be ≤0.02 mm. If the rotor bending value exceeds this limit, the high-speed turbine rotor will experience vibration failure, leading to unplanned shutdowns of the turbine unit. Therefore, it is essential to accurately measure the turbine rotor bending value during turbine maintenance.

[0003] Currently, the commonly used method for measuring the bending value of steam turbine rotors is the mechanical dial indicator method. On the one hand, measuring rotor bending with a mechanical dial indicator requires manual measurement, which results in long operation time and low measurement efficiency. On the other hand, manually reading the pointer graduation value of the mechanical dial indicator results in large reading errors. Summary of the Invention

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

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

[0006] The measuring unit includes a magnetic support and a capacitive displacement sensor. The capacitive displacement sensor is mounted on the magnetic support, and the measuring surface of the capacitive displacement sensor is in contact with a sub-measuring position of a certain measuring point on the turbine rotor. The capacitive displacement sensor is used to measure the displacement signal when the turbine rotor rotates and convert the displacement signal into a voltage signal.

[0007] A data acquisition device, wherein the data acquisition device is connected to the capacitive displacement sensor;

[0008] The data acquisition unit 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] Multiple measurement units are distributed along the axial direction of the turbine rotor, and each measurement unit corresponds to a measurement point on the turbine rotor; each measurement point has multiple sub-measurement positions, and the multiple sub-measurement positions are evenly distributed along the circumferential direction of the turbine rotor.

[0010] The turbine rotor, located at a preset position, rotates. The bending data at each sub-measurement position is measured by a capacitive displacement sensor, and a displacement signal is generated. The displacement signals from each capacitive displacement sensor are plotted as a rotor bending curve, and the maximum bending value of the turbine rotor is calculated.

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

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

[0013] Optionally, the turbine rotor bending measuring device also includes a magnetic base;

[0014] The magnetic bracket is provided with a magnetic base at one end away from the capacitive displacement sensor, and the magnetic base is attracted to 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 and the second electrode constitute a capacitor structure;

[0017] One end of the dielectric plate is attached to a sub-measurement position of a certain measurement point on the 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 to measure the displacement of the turbine rotor.

[0019] Optionally, the Bluetooth unit is located inside the data acquisition unit.

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

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

[0022] Optionally, the display unit receives voltage signals transmitted by the data acquisition unit via the 485 communication protocol.

[0023] Optionally, the data acquisition device is equipped with a battery.

[0024] One technical advantage of this invention is that:

[0025] In this embodiment of the application, the bending data of each sub-measurement position is measured by a capacitive displacement sensor and a displacement signal is generated. The displacement signals of each capacitive displacement sensor are plotted as rotor bending curves, and the maximum bending value of the turbine rotor is calculated.

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

[0027] On the other hand, the turbine rotor bending measuring device adopts precision measurement technology, which eliminates reading and calculation errors by operators, improves measurement accuracy, and effectively avoids shutdown failures caused by large turbine rotor vibration. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the structure of a turbine rotor bending measuring device according to an embodiment of the present invention;

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

[0030] Figure 3 is a schematic diagram of the structure of a capacitive displacement sensor of a turbine rotor bending measuring device according to an embodiment of the present invention;

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

[0032] Figure 5 is a reference diagram of the usage state of a turbine rotor bending measuring device according to an embodiment of the present invention.

[0033] In the diagram: 1. Magnetic support; 2. Capacitive displacement sensor; 21. First electrode plate; 22. Second electrode plate; 23. Dielectric plate; 3. Data acquisition unit; 4. Bluetooth unit; 5. Display unit; 6. Steam turbine rotor; 7. Sub-measurement position. Detailed Implementation

[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, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0035] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] According to a first aspect of the present invention, referring to Figures 1 to 3, a turbine rotor bending measuring device is provided, comprising:

[0040] The measuring unit includes a magnetic support 1 and a capacitive displacement sensor 2. The capacitive displacement sensor 2 is mounted on the magnetic support 1, and the measuring surface of the capacitive displacement sensor 2 is in contact with a sub-measuring position 7 of a certain measuring point of the turbine rotor 6. The capacitive displacement sensor 2 is used to measure the displacement signal when the turbine rotor 6 rotates and convert the displacement signal into a voltage signal.

[0041] Data acquisition device 3, which is connected to the capacitive displacement sensor 2;

[0042] Bluetooth unit 4 and display unit 5, the data acquisition unit 3 is signal connected to the display unit 5 through the Bluetooth unit 4, and the Bluetooth unit 4 is used to transmit the voltage signal to the display unit 5;

[0043] Multiple measuring units are distributed along the axial direction of the turbine rotor 6, and each measuring unit corresponds to a measuring point of the turbine rotor 6; each measuring point has multiple sub-measuring positions 7, and the multiple sub-measuring positions 7 are evenly distributed along the circumferential direction of the turbine rotor 6.

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

[0045] For example, specialized software is used to plot the displacement signal as a turbine rotor bending curve and calculate the maximum bending value of turbine rotor 6, so that the turbine rotor bending value can be accurately measured.

[0046] In this embodiment of the application, the bending data of each sub-measurement position 7 is measured by the capacitive displacement sensor 2 and a displacement signal is generated. The displacement signals of each capacitive displacement sensor 2 are plotted as rotor bending curves, and the maximum bending value of the turbine rotor 6 is calculated.

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

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

[0049] Optionally, each measurement point has eight sub-measurement locations 7.

[0050] In the above embodiment, the turbine rotor 6 is divided into eight sub-measurement positions 78 as measurement orientations. The turbine rotor 6 is rotated, and at each measurement orientation (i.e., sub-measurement position 7), the capacitive displacement sensor 2 converts the displacement signal on the surface of the turbine rotor 6 into a voltage signal and transmits it to the digital acquisition unit. The data acquisition unit 3 transmits the displacement signal to the display unit 5 through 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 1µm and a measurement range of 5mm-10mm. This makes the measurement accuracy and range of the capacitive displacement sensor 2 relatively reasonable, which helps to accurately measure the bending value of the turbine rotor 6.

[0052] Optionally, the turbine rotor bending measuring device also includes a magnetic base;

[0053] The magnetic bracket 1 is provided with a magnetic base at one end away from the capacitive displacement sensor 2, and the magnetic base is attracted to a metal object to fix the magnetic bracket 1.

[0054] In the above embodiment, the magnetic base makes it easier to fix the magnetic support 1 and the capacitive displacement sensor 2, which helps to measure the bending value of the turbine rotor 6.

[0055] Optionally, referring to 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 21 and the second electrode 22 constitute a capacitor structure;

[0057] One end of the dielectric plate 23 is attached to a sub-measurement position 7 of a certain measurement point of the turbine rotor 6, and the other end extends into the space between the first electrode plate 21 and the second electrode plate 22.

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

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

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

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

[0062] Optionally, the display unit 5 is a tablet computer with built-in Bluetooth receiving capability. This allows the display unit 5 to accurately receive the voltage signal transmitted by the data acquisition unit 3.

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

[0064] Optionally, the data acquisition unit 3 is equipped with an internal battery. This better ensures the safe and stable operation of the data acquisition unit 3.

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

[0066] First, measurement preparation: The turbine rotor section 6 is divided into 8 equal parts manually. Color strips are attached at the division positions, and color mark sensors are set up, as shown in Figure 2.

[0067] Ten capacitive displacement sensors 2 are numbered P1, P2, P3, P4, P5, ..., P10. They are evenly distributed along the axial direction of the turbine rotor 6 in numerical order and placed in contact with the turbine rotor 6 to be tested. The capacitive displacement sensors 2 are turned on and their displays are set to zero.

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

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

[0070] Next, the laser color mark sensor (i.e., capacitive displacement sensor 2) outputs a switch signal at each equally spaced point (i.e., sub-measurement position 7) and transmits the signal to the measurement software, enabling the software to collect data at each equally spaced 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 supplemented by a bar chart, as shown in Figure 5.

[0071] Next, the measurement results are as follows: A list of measurement data collected by 10 capacitive displacement sensors at 8 equally spaced points is provided, along with the calculation of the bending vector and bending value at each of the 8 points, as shown in Table 1 below. Unit: wire, 0.01 mm.

[0072] Table 1

[0073]

[0074] It should be noted that the displacement signal includes the bending vector and the bending value. The bending vector is calculated by subtracting the values ​​of the two equally spaced points. For example, the bending vector of the P1 capacitive displacement sensor in the 1-5 direction is 23 - 50 = -23 mils.

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

[0076] Next, referring to Figure 4, the bending curve is automatically drawn: the software draws the bending curve based on the bending value. (Note: because the bending value of the P4 measuring point in the 1-5 direction is the largest, the bending value of the 1-5 direction is extracted as the vertical axis, and the horizontal axis is the evenly distributed measuring points).

[0077] Finally, the bending analysis was performed by manually connecting the wires. The actual maximum bending value was 20 mils, and the bending location was between measuring points P3 and P4, with bending directions 1-5.

[0078] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled 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 measuring device, characterized in that, include: The measuring unit includes a magnetic support and a capacitive displacement sensor. The capacitive displacement sensor is mounted on the magnetic support, and the measuring surface of the capacitive displacement sensor is in contact with a sub-measuring position of a certain measuring point on the turbine rotor. The capacitive displacement sensor is used to measure the displacement signal when the turbine rotor rotates and convert the displacement signal into a voltage signal. A data acquisition device, wherein the data acquisition device is connected to the capacitive displacement sensor; The data acquisition unit 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. Multiple measurement units are distributed along the axial direction of the turbine rotor, and each measurement unit corresponds to a measurement point on the turbine rotor; each measurement point has multiple sub-measurement positions, and the multiple sub-measurement positions are evenly distributed along the circumferential direction of the turbine rotor. The turbine rotor, located at a preset position, rotates. The bending data at each sub-measurement position is measured by a capacitive displacement sensor, and a displacement signal is generated. The displacement signals from each capacitive displacement sensor are plotted as a rotor bending curve, and the maximum bending value of the turbine rotor is calculated.

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

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

4. The turbine rotor bending measuring device according to claim 1, characterized in that, It also includes a magnetic base; The magnetic bracket is provided with a magnetic base at one end away from the capacitive displacement sensor, and the magnetic base is attracted to a metal object to fix the magnetic bracket.

5. The turbine rotor bending measuring device according to claim 1, characterized in that, The capacitive displacement sensor includes a first electrode plate, a second electrode plate, and a dielectric plate; The first electrode and the second electrode constitute a capacitor structure; One end of the dielectric plate is attached to a sub-measurement position of a certain measurement point on the 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 to measure the displacement of the turbine rotor.

6. The turbine rotor bending measuring device according to claim 1, characterized in that, The Bluetooth unit is located inside the data acquisition unit.

7. The turbine rotor bending measuring device according to claim 1, characterized in that, The Bluetooth unit has a transmission distance of 10 meters.

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

9. The turbine rotor bending measuring device according to claim 1, characterized in that, The display unit receives voltage signals transmitted by the data acquisition unit via the 485 communication protocol.

10. The turbine rotor bending measuring device according to claim 1, characterized in that, The data acquisition device has an internal battery.

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