Device and method for installing real-time measuring probe for running state of steam turbine blade

Abstract

The invention provides an installation device and method for a real-time measurement probe for the running state of a steam turbine blade, a first counter bore is formed in the wall of an inner cylinder of a steam turbine, an inner cylinder wall bolt hole and a second counter bore are formed in the wall of the inner cylinder of the steam turbine, the inner cylinder wall bolt hole is communicated with one end of the first counter bore, and the second counter bore is communicated with the other end of the first counter bore; bolts with built-in measuring probes are installed in the bolt holes, six evenly-distributed threaded holes are machined in the wall of the steam turbine inner cylinder, a round metal plate is installed outside a bolt nut, and a center hole and six evenly-distributed through holes matched with the threaded holes are machined in the round metal plate. The device is simple and easy to implement, convenient to replace and better in sealing performance, the measuring probe is safer, more reliable and more stable in installation, the unit turbine blade can be monitored and evaluated for a long time, and the measuring probe can still work safely and stably for a long time in severe environments such as damp and steam blowing.

Description

Technical Field

[0001] The invention belongs to the field of status monitoring of thermal power steam turbine units, and in particular relates to a device and method for installing a real-time measurement probe for the operating status of steam turbine blades. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. In a thermal power steam turbine unit, the steam turbine uses steam as a working fluid to convert thermal energy into mechanical energy to provide power for the generator. The working principle of a steam turbine is based on the expansion and flow of steam in the nozzle and blades. After the steam flows through a fixed nozzle, the pressure and temperature decrease, the volume expands, the flow rate increases, and the thermal energy is converted into kinetic energy. The high-speed steam impacts the blades installed on the impeller, and the blades are forced to drive the rotor to rotate, thereby converting the kinetic energy of the steam into mechanical energy.

[0003] The operating environment and flow state in the turbine flow section of a thermal power steam turbine unit will undergo significant changes, especially in a short period of time, the unit load fluctuations make the steam flow in the turbine flow section extremely unstable, which not only directly affects the unit's turbine operating efficiency, but also complicates the turbine blade stress, aggravates water erosion, and makes the turbine blades more prone to failure, threatening the safe operation of the unit. Therefore, it is very urgent to monitor and evaluate the operating state of the turbine blades in real time, so that the fault can be predicted and corresponding safety measures can be taken in advance before the turbine blades fail or abnormal conditions occur.

[0004] The operating status of the turbine blades during operation is monitored in real time and evaluated and analyzed. Currently, test equipment can be installed on the high-speed rotating rotor or on the stationary parts at the top of the turbine blades to obtain real-time data of the blades under operating conditions, and to analyze and determine the real-time operating status and safety status of the turbine blades.

[0005] In the test of the operating status of the top clearance of the turbine blades, the installation method of the eddy current probe on the inner cylinder wall of the turbine directly determines the accuracy of the monitoring data and the success of the monitoring, and is also an important influencing condition for judging whether the unit can operate stably and safely for a long time. The current fixed installation method of the measuring probe has many problems such as poor welding quality, probe shedding, erosion and difficulty in replacement. In a complex wet steam environment, the above problems can easily cause the turbine blade status monitoring system to stop working or the flow-through part to be damaged, or the probe cannot be replaced after being damaged, which seriously affects the long-term safe and stable operation of the turbine unit. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for installing a real-time measurement probe for the operating status of a turbine blade based on the above-mentioned shortcomings. The present invention is simple and easy to operate, convenient to replace, has better sealing performance, and safer, more reliable and more stable installation of the monitoring probe. It can perform long-term monitoring and evaluation of the turbine blades of the unit, and enables the state characteristic monitoring system probe to still work safely and stably for a long time in harsh environments such as humidity and steam blowing.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides an installation device for a real-time measuring probe for the operating status of a steam turbine blade, comprising a cylinder wall of a steam turbine, and a first countersunk hole provided in the cylinder wall of the steam turbine inner cylinder, wherein the countersunk hole has an internal thread, an inner cylinder wall through hole and a second countersunk hole are provided on the cylinder wall of the steam turbine inner cylinder, wherein the inner cylinder wall through hole is connected to one end of the first countersunk hole, and the second countersunk hole is connected to the other end of the first countersunk hole, wherein a thread is processed in the first countersunk hole, and a bolt with a measuring probe is built in the bolt, wherein the bolt is respectively processed with an external thread, a countersunk hole and a through hole matching the thread, and the bolt with the measuring probe is covered with a circular metal plate consistent with the bolt cap.

[0008] A further improvement of the present invention is that the bolt with the built-in measuring probe is processed with external threads, countersunk holes and through holes matching the threads, so as to facilitate the placement of the measuring probe and lead out the measuring probe lead through the through hole.

[0009] A further improvement of the present invention is that the second countersunk hole on the wall of the inner cylinder of the steam turbine is consistent with the common thickness dimension of the bolt and the circular metal plate.

[0010] A further improvement of the present invention is that the bolts and the circular metal plate of the built-in measuring probe are made of #45 alloy steel metal plate.

[0011] A further improvement of the present invention is that the circular metal plate is processed with a central hole for leading out the measuring probe line and six evenly distributed through holes.

[0012] A further improvement of the present invention is that six evenly distributed threaded holes are processed on the wall of the inner cylinder of the steam turbine.

[0013] The present invention provides a method for installing a real-time measurement probe for the operation status of a steam turbine blade, comprising: The real-time measuring probe of the running status of the steam turbine blade is placed in the countersunk hole of the bolt with external thread, the bolt with the measuring probe is screwed into the first countersunk hole with internal thread on the wall of the inner cylinder of the steam turbine through the second countersunk hole, the circular metal plate is covered on the second countersunk hole and the bolt, the circular metal plate is fastened to the wall of the inner cylinder of the steam turbine by screws through six evenly distributed through holes and six evenly distributed threaded holes, the measuring probe lead is led out through the through hole and the center hole to protect the measuring probe and the bolt with the built-in measuring probe.

[0014] A further improvement of the present invention is that the second countersunk hole on the wall of the inner cylinder of the steam turbine is consistent with the common thickness dimension of the bolt and the circular metal plate.

[0015] A further improvement of the present invention is that the bolts of the built-in measuring probe are made of #45 alloy steel metal plate.

[0016] A further improvement of the present invention is that the circular metal plate is made of #45 alloy steel metal plate.

[0017] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides an installation device and method for a real-time measurement probe of the operation status of a steam turbine blade. The device and method are as follows: a first countersunk hole is provided in the inner cylinder wall of the steam turbine, an inner cylinder wall bolt hole and a second countersunk hole are provided on the inner cylinder wall of the steam turbine, the inner cylinder wall bolt hole is connected to one end of the first countersunk hole, the second countersunk hole is connected to the other end of the first countersunk hole, a bolt with a built-in measurement probe is installed in the bolt hole, the bolt is respectively processed with threads, countersunk holes and through holes, a circular metal plate is installed outside the bolt nut, the circular metal plate is processed with six evenly distributed through holes and a center hole matching the screw holes, and six evenly distributed threaded holes are processed on the inner cylinder wall of the steam turbine. The present invention is simple and easy to use, convenient to replace, better in sealing performance, safer, more reliable and more stable in the installation of the monitoring probe, can perform long-term monitoring and evaluation on the steam turbine blades of the unit, and enables the real-time measurement probe to work safely and stably for a long time in harsh environments such as humidity and continuous steam purging.

[0018] Furthermore, the present invention processes a screw hole on the countersunk hole of the inner cylinder wall of the steam turbine so as to match the bolt of the built-in measuring probe for installation, and a countersunk hole for placing the measuring probe and a through hole for passing the lead wire of the measuring probe are processed in the middle of the bolt. Six threaded holes are evenly distributed on the inner cylinder wall of the steam turbine to install a circular metal plate with a center hole and six evenly distributed through holes, which is convenient for fixing and sealing the measuring probe and preventing wet steam from blowing the measuring probe and its connection wire.

[0019] Furthermore, the bolts and the circular metal plate of the built-in measuring probe of the present invention are made of the better material #45 alloy steel, which avoids erosion damage to the measuring probe during long-term operation in a wet steam environment and prevents the measuring probe and its connection line from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The present invention is a schematic structural diagram of a mounting device for a real-time measurement probe of the operating status of steam turbine blades.

[0022] Description of reference numerals: 1. Inner cylinder wall of steam turbine, 2. Through hole in inner cylinder wall, 3. First countersunk hole, 4. Second countersunk hole, 5. Thread, 6. Bolt, 7. Bolt thread, 8. Bolt countersunk hole, 9. Center hole, 10. Round metal plate, 11. Center hole, 12. Six evenly distributed through holes, 13. Six evenly distributed threaded holes. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present invention, 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 invention 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 limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] Example 1 See also Figure 1The present invention provides an installation device for a real-time measurement probe for the operation status of a steam turbine blade, comprising a steam turbine inner cylinder wall 1, and a first countersunk hole 3 is opened in the steam turbine inner cylinder wall 1, an inner cylinder wall through hole 2 and a second countersunk hole 4 are opened on the steam turbine inner cylinder wall 1, the inner cylinder wall through hole 2 is connected to one end of the first countersunk hole 3, and the second countersunk hole 4 is connected to the other end of the first countersunk hole 3, the first countersunk hole 3 is processed with a thread 5, which is convenient for installing a bolt 6 of a built-in measuring probe, the bolt 6 is respectively processed with a thread 7, a countersunk hole 8 and a through hole 9, a circular metal plate 10 is installed outside the bolt nut, the circular metal plate 10 is processed with a center hole 11 and six evenly distributed through holes 12 matching the screw hole 13, and six evenly distributed threaded holes 13 are processed on the steam turbine inner cylinder wall 1.

[0034] In this embodiment, the bolt 6 and the circular metal plate 10 of the built-in measuring probe are #45 alloy steel metal plates. #45 alloy steel has high strength and good cutting processability, high toughness, fatigue resistance, impact resistance, corrosion resistance, good welding and easy processing performance.

[0035] In this embodiment, an inner cylinder wall through hole 2, a first countersunk hole 3 and a second countersunk hole 4 are provided on the inner cylinder wall 1 of the steam turbine, and the measuring probe can measure the distance to the top of the steam turbine blade through the inner cylinder wall through hole 2. The measuring probe is inserted into the steam turbine through the inner cylinder wall through hole, and the distance between the top of the blade and the probe is measured using sensor technology. This measurement method is usually highly accurate and reliable, and can ensure the accuracy of the measurement results.

[0036] In this embodiment, the inner wall of the first countersunk hole 3 is processed with an internal thread 5, which facilitates the quick and convenient installation of the bolt 6 of the built-in measuring probe and prevents the bolt 6 from loosening and falling off, thereby ensuring that the measuring probe works efficiently and stably.

[0037] In this embodiment, the circular metal plate 10 is processed with a central hole 11 and six evenly distributed through holes 12 matching the screw holes 13, which can not only lead out the connection line of the measuring probe, but also better fix the circular metal plate 8 and prevent the measuring probe from loosening.

[0038] In this embodiment, six evenly distributed threaded holes 13 are provided on the inner cylinder wall 1 to facilitate fixing the circular metal plate 10 and prevent the measuring probe in the bolt 6 from radial movement and wet steam erosion damage.

[0039] Example 2 See also Figure 1 The present invention provides a method for installing a real-time measurement probe for the operation status of a steam turbine blade, comprising: The real-time measuring probe for the operation status of the steam turbine blade is placed in the countersunk hole 8 of the bolt 6 with the external thread 7, the bolt 6 with the measuring probe is screwed into the first countersunk hole 3 with the internal thread 5 on the inner cylinder wall 1 of the steam turbine through the second countersunk hole 4, the circular metal plate 10 is covered on the second countersunk hole 4 and the bolt 6, the circular metal plate 10 is fastened to the inner cylinder wall 1 of the steam turbine with screws through six evenly distributed through holes 12 and six evenly distributed threaded holes 13, the measuring probe lead is led out through the through hole 9 and the center hole 11 to protect the measuring probe and the bolt 6 with the built-in measuring probe.

[0040] In this embodiment, by installing the measuring probe in the bolt 6 and screwing it into the first countersunk hole 3 of the inner cylinder wall 1 of the steam turbine, this design makes the installation of the measuring probe simple and quick. The outer thread 7 of the bolt 6 cooperates with the inner thread 5 of the first countersunk hole 3 to ensure the stability of the installation. The circular metal plate 10 covers the second countersunk hole 4 and the bolt 6 and is fastened to the inner cylinder wall 1 of the steam turbine by screws, providing additional protection for the measuring probe and the bolt to prevent them from being damaged by the external environment. The design of the circular metal plate 10 also reduces the vibration and impact of the measuring probe inside the steam turbine, and improves the stability and accuracy of the measurement. The lead wire of the measuring probe is led out through the through hole 9 and the center hole 11. This design makes the layout of the lead wire neater and avoids excessive interference and confusion inside the steam turbine. When the measuring probe needs to be maintained or replaced, it is only necessary to loosen the screw, remove the circular metal plate 10, and then unscrew the bolt 6. This design makes maintenance work simple and quick, and reduces maintenance costs.

[0041] Example 3 See also Figure 1 The present invention provides a method for installing a real-time measurement probe for the operation status of a steam turbine blade, comprising: Step 1: Open an inner cylinder wall through hole and two countersunk holes on the inner cylinder wall of the turbine. The measuring probe can measure the distance to the top of the turbine blade through the inner cylinder wall through hole.

[0042] Step 2: According to the real-time measurement probe diameter of the turbine blade operating status, design the bolt diameter, internal through hole and countersunk hole size of the built-in measuring probe.

[0043] Step 3: The real-time measurement probe of the turbine blade operating status is placed in the countersunk hole of the bolt, and the lead wire is led out through the internal through hole of the bolt.

[0044] Step 4: Screw the bolt of the built-in measuring probe into the bolt hole on the inner cylinder wall of the turbine, and adjust the effective distance between the measuring probe and the top of the turbine blade to ensure that the measuring probe can normally detect the turbine blade sweeping across the measuring probe to obtain a signal.

[0045] Step 5: The measuring probe lead wire led out from the internal through hole of the bolt is then led out through the center hole of the circular metal plate.

[0046] Step 6: Use screws to fix the circular metal plate to the inner cylinder wall of the turbine through the six evenly distributed through holes of the circular metal plate and the six threaded holes on the inner cylinder wall.

[0047] Step 7: Connect to the vibration data acquisition instrument through the lead hole of the turbine outer cylinder and check whether the measurement probe signal is normal.

[0048] By opening through holes and countersunk holes on the inner cylinder wall, the measuring probe is allowed to accurately measure the distance to the top of the blade, thereby improving the accuracy of the measurement. The measuring probe can monitor the operating status of the blade in real time, capture the dynamic changes of the blade in time, and provide data support for fault warning and performance optimization. The bolts and their internal through holes and countersunk hole sizes are designed according to the probe diameter and the operating status of the blade. This modular design is convenient for customization according to different needs. The present invention uses a bolt and countersunk hole structure to cleverly embed the measuring probe into the inner cylinder wall of the turbine, without occupying additional space, thereby improving space utilization. The lead wire of the measuring probe is led out through the internal through hole of the bolt and the center hole of the circular metal plate, and then connected to the vibration data acquisition instrument through the lead wire hole of the outer cylinder. This design ensures the safety and reliability of data transmission. The circular metal plate not only serves as a channel for the lead wire, but also provides additional protection for the measuring probe to prevent it from being affected by the harsh environment such as high temperature, high pressure and vibration inside the turbine.

[0049] The present invention is simple and easy to operate, has convenient replacement, better sealing performance, and safer, more reliable and stable installation of the monitoring probe. It can perform long-term monitoring and evaluation of the unit's turbine blades, and enables the real-time measurement probe to still work safely, stably and efficiently for a long time in harsh environments such as humidity and continuous steam blowing.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A mounting device for a real-time measurement probe of a steam turbine blade operating status, characterized in that: The invention comprises a cylinder wall (1) of a steam turbine inner cylinder, and a first countersunk hole (3) is provided in the cylinder wall (1) of the steam turbine inner cylinder, the countersunk hole (3) has an internal thread, an inner cylinder wall through hole (2) and a second countersunk hole (4) are provided in the cylinder wall (1) of the steam turbine inner cylinder, the inner cylinder wall through hole (2) is connected to one end of the first countersunk hole (3), and the second countersunk hole (4) is connected to the other end of the first countersunk hole (3), a thread (5) is processed in the first countersunk hole (3), and a bolt (6) with a measuring probe is built in, the bolt (6) is respectively processed with an external thread (7) matching the thread (5), a countersunk hole (8) and a through hole (9), and the bolt (6) with the measuring probe is covered with a circular metal plate (10) consistent with the bolt cap.

2. The installation device of a real-time measurement probe for the operation status of steam turbine blades according to claim 1 is characterized in that: The bolt (6) with the built-in measuring probe is processed with an external thread (7) matching the thread (5), a countersunk hole (8) and a through hole (9), so as to facilitate the placement of the measuring probe, and lead wires of the measuring probe are led out through the through hole (9).

3. The installation device of a real-time measurement probe for the operation status of steam turbine blades according to claim 1 is characterized in that: The second countersunk hole (4) on the inner cylinder wall (1) of the steam turbine is consistent with the common thickness dimension of the bolt (6) and the circular metal plate (10).

4. The installation device of a real-time measurement probe for the operation status of steam turbine blades according to claim 1 is characterized in that: The bolt (6) and the circular metal plate (10) of the built-in measuring probe are made of #45 alloy steel metal plate.

5. The installation device of a real-time measurement probe for the operation status of steam turbine blades according to claim 1 is characterized in that: The circular metal plate (10) is processed with a central hole (11) for leading out a measuring probe line and six evenly distributed through holes (12).

6. The installation device of a real-time measurement probe for the operation status of steam turbine blades according to claim 1 is characterized in that: Six threaded holes (13) are evenly distributed on the wall (1) of the inner cylinder of the steam turbine.

7. The method for installing a real-time measurement probe for the operation status of steam turbine blades according to claim 1, characterized in that: include: A real-time measuring probe for measuring the operating status of a steam turbine blade is placed in a countersunk hole (8) of a bolt (6) having an external thread (7). The bolt (6) having the measuring probe is screwed into a first countersunk hole (3) having an internal thread (5) on a cylinder wall (1) of a steam turbine through a second countersunk hole (4). A circular metal plate (10) is covered on the second countersunk hole (4) and the bolt (6). The circular metal plate (10) is fastened to the cylinder wall (1) of the steam turbine through six evenly distributed through holes (12) and six evenly distributed threaded holes (13). The lead wire of the measuring probe is led out through the through hole (9) and the center hole (11) to protect the measuring probe and the bolt (6) having the measuring probe built therein.

8. The method for installing a real-time measurement probe for the operation status of steam turbine blades according to claim 7, characterized in that: The second countersunk hole (4) on the inner cylinder wall (1) of the steam turbine is consistent with the common thickness dimension of the bolt (6) and the circular metal plate (10).

9. The method for installing a real-time measurement probe for the operation status of steam turbine blades according to claim 7, characterized in that: The bolts (6) for the built-in measuring probe are made of #45 alloy steel sheet metal.

10. The method for installing a real-time measurement probe for the operation status of steam turbine blades according to claim 7, characterized in that: The circular metal plate (10) is made of #45 alloy steel metal plate.

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