Passive wireless temperature measuring device for steam turbine rotor and steam turbine

Abstract

The invention relates to the related technical field of temperature measurement, and discloses a turbine rotor passive wireless temperature measuring device and a turbine, the turbine rotor passive wireless temperature measuring device comprises a rotor, a temperature measuring assembly and an antenna assembly, the temperature measuring assembly comprises a temperature measuring module and a packaging body, the temperature measuring module comprises a ceramic antenna and a temperature measuring chip, and the antenna assembly is used for receiving signals of the temperature measuring module and sending the signals to the packaging body. The rotor is provided with an installation chamber for installing the temperature measurement assembly, and at least one side, far away from the center of the rotor, of the temperature measurement assembly is provided with a heat conduction contact surface. A measured temperature signal can be transmitted to a signal processing device when the temperature measuring assembly rotates through the RFID radio frequency technology in cooperation with the temperature measuring chip, the problem of inaccurate temperature measurement is solved, the temperature measuring assembly is installed in the dovetail groove of the rotor, the contact effect with the rotor can be guaranteed under the action of centrifugal force, the measured temperature is not limited to the surface temperature of the rotor, and the temperature measuring accuracy is improved. The invention also provides a mode that the temperature measurement module is directly contacted with the rotor for heat conduction, an intermediate heat conduction step is omitted, and the temperature measurement module can accurately obtain the temperature of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field related to temperature measurement, and in particular to a passive wireless temperature measurement device for a steam turbine rotor and a steam turbine. Background Art

[0002] Steam turbine failures are partly caused by rotor overheating. Therefore, in order to avoid and reduce the occurrence of accidents, it is necessary to measure the rotor heating in real time. When the equipment is running, if the temperature exceeds the normal level, timely measures should be taken to avoid accidents.

[0003] The existing technology uses infrared temperature measurement technology, which measures temperature by converting the radiation energy of infrared rays emitted by an object into an electrical signal. However, infrared temperature measurement technology only measures surface temperature and cannot measure internal temperature, making it difficult to fully grasp the temperature of the rotor.

[0004] In addition, infrared temperature measurement technology is greatly affected by environmental conditions, such as steam, dust, smoke, etc., which block the optical system of the infrared temperature measuring instrument and affect the accurate temperature measurement. Similarly, if the infrared temperature measuring instrument and the object being measured are blocked, the temperature cannot be measured, or the measured result is an inaccurate temperature, thus causing a misjudgment. In short, infrared temperature measurement technology does not have the problem of accurate monitoring and has certain limitations. It cannot achieve the ideal effect of accurately monitoring temperature changes. In view of the above problems, this application is proposed. Summary of the invention

[0005] The object of the present invention is to provide a passive wireless temperature measuring device for a steam turbine rotor and a steam turbine, so as to solve the problem that it is difficult to achieve accurate monitoring effect by traditional infrared temperature measurement to obtain temperature parameters of the steam turbine rotor.

[0006] The present invention is achieved through the following technical solutions.

[0007] A steam turbine rotor passive wireless temperature measurement device of the present invention comprises a rotor, a temperature measurement component and an antenna component, wherein the temperature measurement component comprises a temperature measurement module and a packaging body, the temperature measurement module comprises a ceramic antenna and a temperature measurement chip, the antenna component is used to receive signals from the temperature measurement module, an installation chamber for installing the temperature measurement component is provided on the rotor, the temperature measurement component is provided with a heat-conducting contact surface on at least one side away from the center of the rotor, the heat-conducting contact surface is used to contact with the rotor to achieve temperature conduction, and when the rotation speed of the rotor increases, the contact pressure between the heat-conducting contact surface and the rotor increases.

[0008] Furthermore, at least two groups of the temperature measuring components are provided, one group is used and the other group is used as a backup, which not only provides redundancy for the temperature measuring components but also solves the dynamic balance of the rotor. The antenna component includes a loop antenna.

[0009] The loop antenna is composed of at least two antennas, which can be conveniently installed along the circumference of the rotor to form a loop. The loop-shaped antenna meets the reaction speed of the temperature measurement chip and avoids signal interruption.

[0010] The antenna component and the temperature measuring component are arranged at a spacing distance along the axis direction of the rotor, and the antenna is fixed on the peripheral guide cone structure to ensure that the rotor does not collide when rotating to damage the rotor.

[0011] Furthermore, the heat-conducting contact surface is arranged on a temperature measuring module, and the temperature measuring module is in direct contact with the rotor.

[0012] The direct contact method ensures the temperature conduction efficiency, enables the temperature measurement module to accurately obtain the rotor temperature, and reduces or eliminates the temperature detection error caused by heat conduction.

[0013] Furthermore, the packaging body includes a retaining frame, an anti-foolproof buckle, a spring sheet, a seal and a screw, and the temperature measurement module is installed in an installation space composed of the anti-foolproof buckle and the spring sheet.

[0014] There are usually multiple sets of anti-fool buckles, and the ceramic labels are attached to the bottom of the installation chamber cavity under the elastic force of the spring to ensure the heat conduction effect.

[0015] Furthermore, a dovetail groove is provided on the rotor, the installation chamber is provided inside the inner wall of the dovetail groove, the outer surface of the retaining frame is flush with the inner wall of the dovetail groove, and the temperature measuring module is installed vertically or horizontally.

[0016] The dovetail groove on the rotor is annular, in which a counterweight can be installed to balance the rotor counterweight. The outer surface of the retaining frame is flush with the inner wall of the dovetail groove, which will not affect the passability of the balance weight in the dovetail groove.

[0017] Furthermore, the heat-conducting contact surface is arranged on the packaging body, and the temperature measuring module is in indirect contact with the rotor.

[0018] This solution provides a higher degree of protection for the temperature measurement module, ensuring the reliability of the temperature measurement module. In addition, the temperature measurement module in this solution constitutes a balance block type temperature measurement module, which can be easily adjusted in position, thereby facilitating the weight balance adjustment of the rotor.

[0019] Furthermore, the packaging body includes a protective shell, a guard plate, a seal and fixing screws, and the temperature measurement module is installed inside the protective shell and is packaged by the seal and the guard plate to form a heat-conducting contact surface on the protective shell.

[0020] The protective shell is made of all metal or only the heat-conducting contact surface is made of metal.

[0021] Furthermore, a dovetail groove is provided on the rotor, and the dovetail groove constitutes an installation chamber. The protective shell as a whole is in the shape of a dovetail block, which matches the shape of the dovetail groove. The heat-conducting contact surface is formed on the inner and outer inclined surfaces of the protective shell, and the fixing screw is arranged perpendicular to the end face of the rotor.

[0022] Furthermore, the protective shell includes a wedge plate, and the wedge plate is detachably connected to the protective shell to ensure convenience during installation.

[0023] Furthermore, a water erosion portion is provided on the protective shell. During operation, the rotor speed is very high. When the temperature is too high, cooling water will be sprayed in. When the rotor rotates, the protective shell will hit the cooling water and produce water erosion. Therefore, two water erosion lengths are generally required at both ends of the protective shell. The water erosion lengths are measured based on the erosion data of the dynamic balancing block over the years.

[0024] A steam turbine comprises the above-mentioned steam turbine rotor passive wireless temperature measurement device.

[0025] Beneficial effects of the present invention: In this solution, the temperature measuring component is fixed on the rotor and rotates with the rotor without contacting other transmission materials. Through RFID radio frequency technology and a temperature measuring chip, the temperature measuring component can transmit the measured temperature signal to the signal processing device when it rotates, thereby solving the problem of inaccurate temperature measurement. In addition, since the temperature measuring component is installed in the dovetail groove of the rotor, it can ensure the contact effect with the rotor under the action of centrifugal force, thereby ensuring the thermal conductivity efficiency, ensuring the temperature measurement accuracy and real-time performance, and the measured temperature is not limited to the rotor surface temperature. This solution also provides a method in which the temperature measuring module directly contacts the rotor for heat conduction, omitting the intermediate heat conduction step, so that the temperature measuring module can accurately obtain the rotor temperature, reducing or eliminating the temperature detection error caused by heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the overall structure of the passive wireless temperature measuring device for a steam turbine rotor of the present invention;

[0029] Figure 2 is a schematic diagram of the end face of the antenna component;

[0030] Figure 3A partial cross-sectional view of the position where the temperature measuring component is installed on the rotor in Example 1;

[0031] Figure 4 This is a schematic diagram of the overall structure of the temperature measurement component in Example 1;

[0032] Figure 5 It is a partial cross-sectional view of the temperature measuring component in Example 1;

[0033] Figure 6 This is a schematic diagram of the structural decomposition of the temperature measurement component in Example 1;

[0034] Figure 7 This is a schematic diagram of the horizontal installation of the temperature measuring component in Example 2;

[0035] Figure 8 This is a schematic diagram of the structure of the temperature measuring component in the horizontal installation mode in Example 2;

[0036] Fig. 9 It is a schematic diagram of the end face of the rotor in the horizontal installation mode in Example 2;

[0037] Fig.10 It is a schematic diagram of the cross-sectional structure of the dovetail groove of the horizontal installation method in Example 2;

[0038] Fig.11 This is a schematic diagram of the structure of the temperature measurement component in the horizontal installation mode in Example 2;

[0039] Fig.12 This is a schematic diagram of the exploded structure of the temperature measurement component in the horizontal installation mode in Example 2;

[0040] Fig.13 This is a schematic diagram of the vertical installation of the temperature measuring component in Example 2;

[0041] Fig.14 This is a schematic diagram of the structure of the temperature measurement component in the vertical installation mode in Example 2;

[0042] Fig.15 This is a schematic diagram of the end face of the rotor in the vertical installation mode in Example 2;

[0043] Fig.16 It is a schematic diagram of the cross-sectional structure of the dovetail groove of the vertical installation method in Example 2;

[0044] Fig.17 This is a schematic diagram of the structure of the temperature measurement component in the vertical installation mode in Example 2;

[0045] Fig.18 This is a schematic diagram of the decomposed structure of the temperature measurement component in the vertical installation method in Example 2. DETAILED DESCRIPTION

[0046] Combine the following Figure 1-18 The present invention is described in detail.

[0047] Embodiment 1:

[0048] A steam turbine rotor passive wireless temperature measuring device according to the present invention is as follows: Figure 1-Figure 3 , including a rotor 1, a temperature measurement component 2 and an antenna component 3.

[0049] like Figure 4-Figure 6 The temperature measurement component 2 includes a temperature measurement module 28 and a packaging body, and the temperature measurement module 28 includes a ceramic antenna 281 and a temperature measurement chip 282.

[0050] The antenna assembly 3 is used to receive the signal of the temperature measurement module 28. The antenna assembly 3 includes a ring antenna, which is composed of at least two antennas. When installed, it is convenient to form a ring along the circumference of the rotor. The side facing the temperature measurement assembly 2 is the antenna radiation surface, and the other side is the antenna reflection surface. The turbine rotor speed is 3000 rpm, and the single revolution time is 20ms / revolution. The period from the excitation of the RFID radio frequency temperature measurement chip to the measured temperature feedback is 25ms. Therefore, the ring-shaped antenna meets the reaction speed of the temperature measurement chip and avoids signal interruption.

[0051] The antenna component and the temperature measuring component are arranged at a spacing distance along the axis direction of the rotor, and the antenna is fixed on the peripheral guide cone structure to ensure that the rotor does not collide when rotating to damage the rotor.

[0052] The dovetail groove 11 on the rotor 1 is annular, larger inside and smaller outside, and can be used to install a counterweight to balance the rotor.

[0053] At least two groups of temperature measuring components 2 are set, fixed in the dovetail groove on the end face of the rotor shaft, one group is fixed at 180 degrees of the circumference, one group is used and one group is backed up. The general maintenance cycle of the steam turbine is about 2 years. There is no fault and no shutdown within 2 years. One group is backed up, which not only makes the temperature measuring component redundant, but also solves the dynamic balance of the rotor.

[0054] In this embodiment, the heat-conducting contact surface is arranged on the packaging body, and the temperature measuring module 28 is in indirect contact with the rotor 1 .

[0055] like Figure 6The package body includes a protective shell 21, a guard plate 23, a seal 25 and a fixing screw 22 made of metal material. The temperature measuring module 28 is installed inside the protective shell 21 and is encapsulated by the seal 25 and the guard plate 23. A heat-conducting contact surface is formed on the protective shell 21. The protective shell 21 is in the shape of an arc-shaped dovetail block as a whole, with the same radius as the annular dovetail groove, and matches the shape of the dovetail groove 11. The heat-conducting contact surface is formed at the outer inclined surface of the protective shell 21, and the fixing screw 22 is arranged perpendicular to the end face of the rotor 1. When in use, due to the action of centrifugal force, the contact pressure between the heat-conducting contact surface and the rotor will increase, thereby ensuring the heat conduction efficiency, and ensuring the temperature measurement accuracy and real-time performance. During installation, the package body will move toward the outside of the end face during the tightening of the fixing screw 22, so that the heat-conducting contact surface can be pressed against the inclined surface of the dovetail groove 11, thereby achieving full contact between the fixation and the heat-conducting contact surface.

[0056] In addition, the protective shell 21 includes a wedge plate 27 , and the wedge plate 27 is detachably connected to the protective shell 21 to ensure convenience during installation.

[0057] This solution provides a higher degree of protection for the temperature measuring module 28, ensuring the reliability of the temperature measuring module 28. In addition, the temperature measuring module 28 in this solution constitutes a balancing block type temperature measuring module, which can be easily adjusted in position to facilitate the weight balance adjustment of the rotor without drilling additional holes on the rotor, thereby avoiding affecting the performance of the rotor.

[0058] When measuring temperature, the rotor temperature is transmitted to the protective shell of the balance block type temperature measurement component, and the temperature measuring chip measures the temperature. The temperature measuring chip loads the temperature information onto the electromagnetic wave and transmits it through the ceramic antenna. The external receiving antenna receives the electromagnetic wave signal and outputs it to the reader, which is then converted into a digital signal output. The temperature is displayed on the display terminal. At this time, a temperature measurement cycle is completed, and the measured temperature is output at the set frequency according to the set temperature measurement interval time.

[0059] Preferably, a water erosion portion 21 is provided on the protective shell. During operation, the rotor 1 rotates at a very high speed. When the temperature is too high, cooling water will be sprayed in. When the rotor 1 rotates, the protective shell 21 will hit the cooling water and produce water erosion. Therefore, two water erosion lengths are generally required to be set at both ends of the protective shell. The water erosion lengths are measured based on the erosion data of the dynamic balancing block over the years.

[0060] Embodiment 2:

[0061] Different from Example 1, in this embodiment, the thermal contact surface is arranged on the temperature measuring module 28, and the ceramic antenna 281 and / or the temperature measuring chip 282 in the temperature measuring module 28 are in direct contact with the rotor 1. The direct contact method ensures the temperature conduction efficiency, so that the temperature measuring module 28 can accurately obtain the rotor temperature and reduce or eliminate the temperature detection error caused by heat conduction.

[0062] The temperature measuring component 2 in this embodiment has two installation methods, such as Figure 7-Figure 18 ,in Figure 7-Figure 12 For horizontal installation, Figure 13-Figure 18 It is installed vertically.

[0063] Both methods include a retaining frame 291, an anti-mistake buckle 292, a spring piece 293, a seal 25 and a screw 22. The outer side surface of the retaining frame 291 is provided with a label orientation mark.

[0064] Horizontal installation: Figure 7-Figure 12 The package body 29 includes a retaining frame 291, an anti-foolproof buckle 292, a spring 293, a seal 25 and a screw 22. The temperature measurement module 28 is installed in the installation space composed of the anti-foolproof buckle 292 and the spring 293. The anti-foolproof buckle 292 is generally provided in multiple groups. The spring 293 is used for gap compensation and resists the ceramic antenna. The ceramic tag is fitted with the bottom of the installation chamber cavity under the elastic force of the spring 293 to ensure the heat conduction effect. The mounting hole of the retaining frame is provided with an internal thread and is tightened with a captive screw, which is very convenient for replacement and disassembly.

[0065] The installation chamber 12 is arranged inside the inner wall of the dovetail groove 11. The installation chamber 12 is arranged flatly in the inner wall of the dovetail groove 11. The structure after installation is as follows Figure 7 As shown, the outer surface of the retaining frame 291 is flush with the inner wall of the dovetail groove 11, and the way in which the outer surface of the retaining frame 291 is flush with the inner wall of the dovetail groove 11 will not affect the passability of the balancing weight in the dovetail groove.

[0066] This solution opens a shallow hole on the rotor to avoid affecting the rotor structure performance and ensure that the temperature measurement module 28 is in full contact with the rotor.

[0067] Vertical installation: Figure 13-Figure 18 , which is different from the horizontal installation method, the extension direction of the installation chamber 12 is vertically arranged compared to the end surface of the rotor, such as Fig.13 The temperature measuring module 28 is installed in an inserted manner. This method can measure the temperature deeper inside the rotor, ensuring sufficient monitoring of the rotor temperature parameters.

[0068] In the above two installation methods, the retaining frame can be made of plastic or metal. When the rotor rotates, centrifugal force is generated. Under the action of centrifugal force, the ceramic antenna fits tightly with the side wall of the cavity. The temperature of the rotor is transmitted to the temperature measurement module 28 in real time, so as to measure the temperature change of the rotor. In this method, since the temperature measurement component is embedded in the rotor, it will not collide with the cooling water during rotation, and will not cause water erosion. The protection difficulty is small and the risk of failure is small.

[0069] A steam turbine comprises the steam turbine rotor passive wireless temperature measurement device in any one of the above embodiments.

[0070] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam turbine rotor passive wireless temperature measurement device, characterized in that: The invention comprises a rotor (1), a temperature measuring component (2) and an antenna component (3), wherein the temperature measuring component (2) comprises a temperature measuring module (28) and a packaging body, the temperature measuring module (28) comprises a ceramic antenna (281) and a temperature measuring chip (282), the antenna component (3) is used to receive signals from the temperature measuring module (28), the rotor (1) is provided with an installation chamber for installing the temperature measuring component (2), the temperature measuring component (2) is provided with a heat conducting contact surface on at least one side thereof away from the center of the rotor (1), the heat conducting contact surface is used to contact with the rotor (1) to achieve temperature conduction, and when the rotation speed of the rotor (1) increases, the contact pressure between the heat conducting contact surface and the rotor (1) increases.

2. The steam turbine rotor passive wireless temperature measurement device according to claim 1 is characterized in that: The temperature measurement components (2) are provided in at least two groups, and the antenna component (3) comprises a loop antenna.

3. The steam turbine rotor passive wireless temperature measurement device according to claim 1 or 2, characterized in that: The heat-conducting contact surface is arranged on a temperature measuring module (28), and the temperature measuring module (28) is in direct contact with the rotor (1).

4. The steam turbine rotor passive wireless temperature measurement device according to claim 3 is characterized in that: The packaging body comprises a retaining frame (291), an anti-foolproof buckle (292), a spring sheet (293), a sealing member (25) and a screw (22); the temperature measurement module (28) is installed in an installation space formed by the anti-foolproof buckle (292) and the spring sheet (293).

5. The steam turbine rotor passive wireless temperature measurement device according to claim 4 is characterized in that: The rotor (1) is provided with a dovetail groove (11), the installation chamber is arranged inside the inner wall of the dovetail groove (11), the outer surface of the retaining frame (291) is flush with the inner wall of the dovetail groove (11), and the temperature measurement module (28) is installed vertically or horizontally.

6. The steam turbine rotor passive wireless temperature measurement device according to claim 1 or 2, characterized in that: The heat-conducting contact surface is arranged on the packaging body, and the temperature measurement module (28) is in indirect contact with the rotor (1).

7. The steam turbine rotor passive wireless temperature measurement device according to claim 6 is characterized in that: The packaging body comprises a protective shell (21), a protective plate (23), a sealing member (25) and a fixing screw (22); the temperature measurement module (28) is installed inside the protective shell (21) and is packaged by the sealing member (25) and the protective plate (23), thereby forming a heat-conducting contact surface on the protective shell (21).

8. The steam turbine rotor passive wireless temperature measurement device according to claim 7 is characterized in that: The rotor (1) is provided with a dovetail groove (11), the dovetail groove (11) forming an installation chamber, the protective shell (21) is in the shape of a dovetail block as a whole, matching the shape of the dovetail groove (11), the heat-conducting contact surface is formed on the inner and outer inclined surfaces of the protective shell (21), and the fixing screw (22) is arranged perpendicular to the end face of the rotor (1).

9. The steam turbine rotor passive wireless temperature measurement device according to claim 8, characterized in that: The protective shell (21) comprises a wedge plate (27), and the wedge plate (27) is detachably connected to the protective shell (21).

10. A steam turbine, characterized in that: The invention comprises the steam turbine rotor passive wireless temperature measuring device as described in any one of claims 1 to 9.

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