Turbine axial displacement monitoring alignment installation framework, verification system and method

Abstract

The invention discloses a steam turbine axial displacement monitoring alignment installation framework and verification system and method. The steam turbine axial displacement monitoring alignment installation framework comprises a transmission shaft disc structure; the bottom box alignment distance measuring structure comprises a first eddy current sensor and a first laser alignment sensor; the first eddy current sensor and the transmission shaft disc structure are correspondingly arranged at a pre-debugging interval; the cover box alignment distance measuring structure and the bottom box alignment distance measuring structure can be assembled and connected in a fastening manner; the cover box alignment distance measuring structure comprises a second eddy current sensor and a second laser alignment sensor; when the cover box alignment distance measuring structure and the bottom box alignment distance measuring structure correspond to each other and are not fixedly assembled and connected, the second eddy current sensor and the first eddy current sensor are correspondingly arranged, and the first laser alignment sensor and the second laser alignment sensor are correspondingly arranged. The technical problem that in the prior art, a steam turbine framework is prone to monitoring numerical value deviation, so that the possibility of protection refusal action or misoperation is caused, and economic safety is not facilitated is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine axial displacement monitoring, and in particular to a steam turbine axial displacement monitoring alignment installation structure, a verification system and a method. Background Art

[0002] At present, the steam turbine generator set, also known as the steam turbine, is one of the core equipment in thermal power plants and plays an important role in converting thermal energy into electrical energy. As a rotary steam power device, the working principle of the steam turbine is to accelerate high-temperature and high-pressure steam and spray it to the rotor blades, so as to use the pressure difference formed on both sides of the blades to generate lift to drive the rotor to rotate, and then the rotor drives the main shaft connected to the generator transmission to rotate synchronously, thereby transferring kinetic energy to the generator to generate electricity. At the same time, in order to improve the utilization rate of steam, the rotor is usually set to multiple stages, and stators for increasing the kinetic energy speed of steam are alternately provided between the multiple stages of rotors.

[0003] In the actual operation of steam turbines, the movement of the rotor along the main axis is called axial displacement, and the main cause of axial displacement is the axial thrust generated when the steam drives the rotor to rotate. When the axial thrust is too large and the axial displacement value exceeds the standard value allowed by the design, the axial relative clearance between the rotor and the stator will disappear, resulting in mutual friction and collision, which will cause serious accidents of the unit.

[0004] Therefore, the turbine axial displacement monitoring system is usually used to measure the axial displacement value of the turbine. When the measured axial displacement deviation exceeds the allowable range, the axial displacement monitoring system will send out an alarm signal. In serious cases, the turbine will automatically stop running, thereby avoiding major equipment damage to a large extent.

[0005] In the prior art, when setting up the steam turbine structure, a metal measuring disk is usually assembled based on the main shaft positioning, and then the eddy current sensor is fixedly assembled inside the bottom box of the steam turbine, and the spacing between the eddy current sensor and the metal measuring disk is pre-debugged, so that the position of the metal measuring disk measured based on the current generated by the alternating magnetic field of the eddy current sensor corresponds to the zero position of the axial displacement. However, when the cover box and the side box are currently assembled based on the bottom box, due to factors such as assembly tolerance and spindle mobility, the metal measuring disk will produce an irregular offset relative to the eddy current sensor with the spindle after assembly. This offset will cause the relative lag or advance between the pre-debugged monitoring zero position and the actual position of the spindle, which may cause the protection rejection or malfunction of the turbine axial displacement monitoring system, thereby causing economic losses from shutdown or even equipment damage; and due to factors such as the bolt assembly tolerance between the bottom box and the cover box, the eddy current sensors respectively assembled in the bottom box and the cover box are also prone to relative deviations, which cannot meet the unified pre-debug spacing requirements.

[0006] At the same time, the eddy current sensors used in the current axial displacement monitoring system are usually installed in a concealed position, which makes maintenance and replacement difficult, so they are usually replaced after a fixed number of years. The performance of the electronic components of the eddy current sensor will gradually decline as the service life increases, especially after a certain number of years, its voltage will decay sharply, and its degree of decay cannot be effectively determined. This makes it impossible to judge whether the monitoring value within the maintenance cycle is deviated, and protection control can only rely on the monitoring value, which further increases the possibility of protection refusal or malfunction, which is not conducive to economic safety. Summary of the invention

[0007] To this end, the present invention provides a turbine axial displacement monitoring alignment installation structure, verification system and method to solve the technical problems in the prior art that when the turbine structure is erected, the pre-debugged monitoring zero position is easily offset from the actual position of the main shaft, the eddy current sensors corresponding to the different positions of the metal measuring disk are easily prone to relative deviations, and the attenuation degree of the monitoring element and the monitoring value deviation cannot be effectively determined, resulting in the possibility of protection rejection or malfunction, which is not conducive to economic safety.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A steam turbine axial displacement monitoring alignment installation structure, comprising:

[0010] The transmission shaft disc structure includes a transmission main shaft and a metal measuring disc fixedly connected to the transmission main shaft; the bottom box alignment and distance measurement structure includes a bottom box extension base and a first eddy current sensor and a first laser alignment sensor respectively fixedly connected to the bottom box extension base; the probe end of the first eddy current sensor and the metal measuring disc are arranged to maintain a pre-debugging distance corresponding to each other;

[0011] The cover box alignment and distance measuring structure can be fastened, assembled and connected with the bottom box alignment and distance measuring structure;

[0012] The cover box alignment and distance measurement structure comprises a cover box extension base and a second eddy current sensor and a second laser alignment sensor respectively fixedly arranged on the cover box extension base;

[0013] When the cover box alignment and ranging structure and the bottom box alignment and ranging structure are corresponding to each other and are not tightly assembled and connected, the second eddy current sensor and the first eddy current sensor as well as the first laser alignment sensor and the second laser alignment sensor are all arranged correspondingly.

[0014] On the basis of the above technical solution, the present invention is further described as follows:

[0015] As a further solution of the present invention, it also includes:

[0016] The steam turbine casing structure comprises a bottom casing and a cover casing which can be fastened and assembled in connection;

[0017] The bottom box extension base is fixedly mounted on the inner wall of the bottom box;

[0018] The cover box extension base is fixedly mounted on the inner wall of the cover box;

[0019] The second eddy current sensor is arranged correspondingly to the installation position of the cover box body based on the installation position of the first eddy current sensor based on the bottom box body before initial assembly, and the first laser alignment sensor and the second laser alignment sensor are arranged correspondingly before initial assembly.

[0020] A method for aligning and installing the steam turbine axial displacement monitoring alignment and installation structure according to the above-mentioned method comprises the following steps:

[0021] Determine the axial displacement zero position of the transmission shaft disc structure, and further pre-debug the monitoring distance between the bottom box alignment distance measurement structure and the transmission shaft disc structure based on the transmission shaft disc structure;

[0022] Pre-start the bottom box alignment and distance measurement structure, and use the bottom box alignment and distance measurement structure to monitor in real time the offset of the transmission shaft disc structure based on the axial displacement zero position during the assembly process of the turbine box structure;

[0023] Continue to pre-start the cover box alignment and distance measurement structure, and monitor the assembly deviation of the cover box alignment and distance measurement structure based on the bottom box alignment and distance measurement structure in the steam turbine box structure assembly process in real time;

[0024] The offset value is adjusted according to the axial displacement of the transmission shaft disc structure, and the assembly deviation value is further adjusted according to the cover box alignment and distance measurement structure.

[0025] As a further solution of the present invention, the following steps are also included:

[0026] The determining of the axial displacement zero position of the transmission shaft disc structure and further pre-debugging the monitoring distance between the bottom box alignment distance measurement structure and the transmission shaft disc structure based on the transmission shaft disc structure specifically includes:

[0027] The axial displacement zero position of the transmission main shaft and the metal measuring disk in the transmission shaft disk structure is determined by the thrust disk shoe of the steam turbine generator set structure, and the distance between the first eddy current sensor and the metal measuring disk in the bottom box alignment distance measurement structure is further pre-adjusted so that the position of the metal measuring disk measured based on the current generated by the alternating magnetic field of the first eddy current sensor corresponds to the axial displacement zero position;

[0028] The pre-starting bottom box alignment and distance measurement structure and real-time monitoring of the offset of the transmission shaft disc structure based on the axial displacement zero position during the assembly process of the steam turbine box structure through the bottom box alignment and distance measurement structure specifically include:

[0029] Pre-starting the first eddy current sensor, and assembling the bottom box body and the cover box body in the steam turbine box structure by using fasteners, and monitoring the offset x of the metal measuring disk based on the axial displacement zero position in the assembly process in real time by using the first eddy current sensor in the started state;

[0030] The method of continuing to pre-start the cover box alignment and distance measurement structure and real-time alignment monitoring of the assembly deviation of the cover box alignment and distance measurement structure based on the bottom box alignment and distance measurement structure during the steam turbine box structure assembly process specifically includes:

[0031] Continue to pre-start the first laser alignment sensor in the bottom box alignment and distance measurement structure and the second laser alignment sensor in the cover box alignment and distance measurement structure;

[0032] After the bottom box body and the cover box body are assembled, the assembly deviation y of the first laser alignment sensor positioned by the second laser alignment sensor based on the pre-adjustment positioning is determined by comparison.

[0033] As a further solution of the present invention, the following steps are also included:

[0034] The adjustment of the offset value for the axial displacement of the transmission shaft disc structure and the further adjustment of the assembly deviation value for the cover box alignment distance measurement structure specifically include:

[0035] When the turbine generator set structure is running in a hot state, the offset x value is pre-increased for the axial displacement of the transmission main shaft and the metal measuring disk, and the assembly deviation y value is further pre-increased for the distance between the second laser alignment sensor and the metal measuring disk, thereby improving the accuracy of axial displacement monitoring.

[0036] A steam turbine axial displacement monitoring and verification system, the steam turbine axial displacement monitoring alignment installation structure, the verification system further includes:

[0037] The axial displacement transmission structure comprises a displacement transmission bearing seat, wherein the displacement transmission bearing seat has a coaxial displacement inner ring and a displacement transmission outer ring; the coaxial displacement inner ring transmission sleeve is assembled on the transmission main shaft, and the displacement transmission outer ring sleeve is assembled on the outer side of the coaxial displacement inner ring;

[0038] A synchronous shifting structure is fixedly mounted on the bottom box, and the synchronous shifting structure has a sliding shifting end portion, the sliding direction of the sliding shifting end portion is arranged parallel to the axial direction of the transmission main shaft, and the sliding shifting end portion is transmission-fixedly connected to the shifting transmission outer ring;

[0039] A displacement measuring ruler structure is fixedly connected to the synchronous displacement structure, and the displacement measuring ruler structure and the sliding direction of the sliding displacement end portion are correspondingly extended in the same direction;

[0040] The visual probe structure is fixedly mounted on the sliding displacement end of the synchronous displacement structure, and the input end of the visual probe structure is correspondingly arranged with the displacement measuring ruler structure.

[0041] As a further solution of the present invention, the synchronous displacement structure includes a directional guide rail seat;

[0042] The sliding displacement end is configured as a synchronous displacement slider;

[0043] The directional guide rail seat is fixedly mounted on the inner wall of the bottom box body, and the extension direction of the directional guide rail seat is parallel to the axial direction of the transmission main shaft;

[0044] The synchronous shift slider is slidably mounted on the directional guide rail seat, and the synchronous shift slider is transmission-fixedly connected to the shift transmission outer ring through a shift transmission arm;

[0045] The displacement measuring ruler structure and the directional guide rail seat are arranged to extend in the same direction and be fixedly connected;

[0046] The synchronous shifting slider is provided with a scale pointer corresponding to the shifting ruler structure;

[0047] The visual probe structure is fixedly mounted on the synchronous shifting slider, and the visual probe structure is arranged correspondingly to the scale pointer of the synchronous shifting slider and the shifting ruler structure.

[0048] A verification method for a steam turbine axial displacement monitoring verification system comprises the following steps:

[0049] Obtain the axial displacement of the transmission shaft disc structure based on the alignment and distance measurement structure monitoring;

[0050] The axial displacement of the shaft disc structure is synchronized in real time through the axial displacement transmission structure, and the synchronized axial displacement is further matched to the displacement measuring scale structure by using the synchronized displacement transmission structure, so as to form a mechanical overall axial displacement monitoring framework;

[0051] The axial displacement corresponding to the displacement measuring ruler structure is obtained in real time through the visual probe structure;

[0052] The axial displacement corresponding to the displacement measuring scale structure is obtained through the visual probe structure, and compared with the axial displacement of the transmission shaft disc structure obtained by the alignment distance measuring structure monitoring. The voltage attenuation degree of the eddy current sensor is verified based on the comparison result feedback, so as to make targeted monitoring adjustments.

[0053] At the same time, when a visual probe structure clearly fails, the failed node is directly used as the maintenance node of the visual probe structure to stably maintain the collaborative monitoring and comparison verification functions.

[0054] As a further solution of the present invention, the following steps are also included:

[0055] The method of obtaining the axial displacement of the transmission shaft disc structure based on the alignment and distance measurement structure monitoring specifically includes:

[0056] The first eddy current sensor based on the bottom box alignment and distance measurement structure cooperates with the second eddy current sensor based on the cover box alignment and distance measurement structure to monitor and obtain the axial displacement of the transmission main shaft and the metal measuring disk in the transmission shaft disk structure;

[0057] The axial displacement of the shaft disc structure is synchronously transmitted in real time through the axial displacement transmission structure, and the synchronous displacement structure is further used to correspond the synchronized axial displacement to the displacement measuring structure to form a mechanical overall axial displacement monitoring architecture, which specifically includes:

[0058] The axial displacement of the main shaft and the metal measuring disk is synchronously transmitted in real time through the shift transmission bearing seat in the axial shift transmission structure, and the synchronous shift slider in the synchronous shift structure is further driven to synchronously shift along the directional guide rail seat by the shift transmission bearing seat;

[0059] When the synchronous shifting slider performs synchronous equal shifting along the directional guide rail seat, the scale pointer of the synchronous shifting slider synchronously corresponds to the corresponding value of the axial displacement based on the shifting ruler structure.

[0060] As a further solution of the present invention, the following steps are also included:

[0061] The real-time acquisition of the axial displacement corresponding to the displacement measuring ruler structure by the visual probe structure specifically includes:

[0062] The corresponding numerical value of the axial displacement of the shift measuring structure corresponding to the scale pointer of the synchronous shift slider is obtained in real time through the visual probe structure, so as to utilize the visual probe structure to complete the coordinated monitoring of the axial displacement of the transmission spindle and the metal measuring disk with the eddy current sensor.

[0063] The present invention has the following beneficial effects:

[0064] 1. The alignment installation structure can effectively form the established foundation and kinetic energy assembly structure of the steam turbine generator set through the cooperation of the steam turbine case structure and the transmission shaft disc structure. At the same time, the bottom box alignment distance measurement structure can be used to monitor the offset of the transmission shaft disc structure based on the zero position in real time when the steam turbine case structure is erected, thereby pre-increasing the offset value during monitoring operation to effectively ensure the accuracy of the displacement monitoring value. In addition, the cover box alignment distance measurement structure can be used to monitor the assembly deviation between it and the bottom box alignment distance measurement structure during the erection of the steam turbine case structure in real time. Therefore, the cover box alignment distance measurement structure can be used to form a multi-position displacement monitoring function for the transmission shaft disc structure in the future. The deviation value can be pre-increased by the corresponding cover box alignment distance measurement structure during monitoring operation, thereby further ensuring the accuracy of multi-position displacement monitoring;

[0065] 2. The verification system can synchronize the axial displacement of the transmission spindle and the metal measuring disk in real time through the axial shift transmission structure, and can further use the synchronous shift structure to correspond the synchronized axial displacement to the shift measuring scale structure, thereby forming a mechanical overall axial displacement monitoring architecture, and then the axial displacement corresponding to the shift measuring scale structure can be obtained in real time with the help of the visual probe structure, so as to achieve coordinated monitoring of the axial displacement of the transmission spindle and the metal measuring disk with the eddy current sensor, and at the same time, the voltage attenuation degree of the eddy current sensor can be compared and verified based on the mechanical architecture, thereby significantly improving the accuracy of the axial displacement monitoring value during the maintenance cycle, and in addition, with the help of the intuitive performance characteristics of the visual probe structure, it can be directly judged when a fault occurs in the visual probe structure, so that the maintenance node can be more clearly defined to stably maintain the coordinated monitoring and comparison verification functions, further significantly improving the accuracy of the axial displacement monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0067] Figure 1 A schematic diagram of the overall axonometric structure of the steam turbine axial displacement monitoring alignment installation architecture provided in an embodiment of the present invention.

[0068] Figure 2 A schematic diagram of the overall process of an alignment installation method according to an alignment installation framework for monitoring axial displacement of a steam turbine provided in an embodiment of the present invention.

[0069] Figure 3 A schematic diagram of the overall axonometric structure of a steam turbine axial displacement monitoring and verification system provided in an embodiment of the present invention.

[0070] Figure 4 A schematic diagram of the assembly structure of a shift transmission bearing seat based on a transmission main shaft in a steam turbine axial displacement monitoring and verification system provided in an embodiment of the present invention.

[0071] Figure 5 A schematic diagram of the overall process of a verification method according to a steam turbine axial displacement monitoring verification system provided in an embodiment of the present invention.

[0072] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0073] Steam turbine casing structure 1: bottom casing 11, cover casing 12;

[0074] Transmission shaft disc structure 2: transmission main shaft 21, metal measuring disc 22;

[0075] Bottom box alignment and distance measurement structure 3: bottom box extension base 31, first eddy current sensor 32, first laser alignment sensor 33;

[0076] Cover box alignment and distance measurement structure 4: cover box extension base 41, second eddy current sensor 42, second laser alignment sensor 43;

[0077] Axial shift transmission structure 5: shift transmission bearing seat 51, coaxial rotation inner ring 511, shift transmission outer ring 512, shift transmission arm 52;

[0078] Synchronous shift structure 6: directional guide rail seat 61, synchronous shift slider 62;

[0079] Displacement measuring ruler structure 7; Visual probe structure 8. DETAILED DESCRIPTION

[0080] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0081] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0082] like Figure 1 As shown, an embodiment of the present invention provides a steam turbine axial displacement monitoring alignment installation structure, including a steam turbine case structure 1, a transmission shaft disc structure 2, a bottom box alignment distance measurement structure 3 and a cover box alignment distance measurement structure 4, which is used to effectively form a predetermined foundation and kinetic energy assembly structure of a steam turbine generator set through the cooperation of the steam turbine case structure 1 and the transmission shaft disc structure 2, and at the same time, the bottom box alignment distance measurement structure 3 can be used to monitor the offset of the transmission shaft disc structure 2 based on the zero position in real time when the steam turbine case structure 1 is erected, thereby pre-increasing the offset value during monitoring operation. In order to effectively ensure the accuracy of the displacement monitoring value, the cover box alignment and distance measurement structure 4 can also be used to monitor the assembly deviation between it and the bottom box alignment and distance measurement structure 3 in real time when the turbine box structure 1 is erected. Therefore, the cover box alignment and distance measurement structure 4 can be used to form a multi-position displacement monitoring function for the transmission shaft disc structure 2 in the future. The deviation value can be pre-increased corresponding to the cover box alignment and distance measurement structure 4 during the monitoring operation, thereby further effectively ensuring the accuracy of the multi-position displacement monitoring value and improving the functional practicality of the overall architecture. The specific settings are as follows:

[0083] Please refer to Figure 1 The steam turbine casing structure 1 includes a bottom casing 11 and a cover casing 12, and the bottom casing 11 and the cover casing 12 can be assembled and connected by fasteners, so as to form a predetermined basic assembly structure of the steam turbine generator set through the steam turbine casing structure 1; the transmission shaft disc structure 2 includes a transmission main shaft 21 and a metal measuring disc 22 fixedly connected to the transmission main shaft 21, so as to effectively serve as a stator and rotor assembly driving component of the steam turbine generator set through the transmission main shaft 21, and at the same time, the metal measuring disc 22 cooperates with the distance measuring structure to form a monitoring component structure for axial displacement.

[0084] Specifically, the bottom box alignment and ranging structure 3 includes a bottom box extension base 31 and a first eddy current sensor 32, and the cover box alignment and ranging structure 4 includes a cover box extension base 41 and a second eddy current sensor 42; wherein, the bottom box extension base 31 is fixedly mounted on the inner wall of the bottom box body 11, and the cover box extension base 41 is fixedly mounted on the inner wall of the cover box body 12; the first eddy current sensor 32 is fixedly mounted on the bottom box extension base 31, and the probe end of the first eddy current sensor 32 is arranged to correspond to the pre-debugging spacing with the metal measuring disk 22, so as to make the metal measuring disk 22 The disk 22 and the transmission main shaft 21 are in an axial zero position state before the initial assembly, and the first eddy current sensor 32 can be used to pre-start and monitor in real time the offset of the metal measuring disk 22 based on the axial zero position during the assembly process; the second eddy current sensor 42 is fixedly mounted on the cover box extension base 41, and the second eddy current sensor 42 is based on the installation position of the cover box body 12 and the installation position of the first eddy current sensor 32 based on the bottom box body 11 before the initial assembly. It is used to form multi-position displacement monitoring through the second eddy current sensor 42 and the first eddy current sensor 32 after assembly.

[0085] More specifically, the bottom box alignment and ranging structure 3 also includes a first laser alignment sensor 33, and the cover box alignment and ranging structure 4 also includes a second laser alignment sensor 43; wherein, the first laser alignment sensor 33 is fixedly mounted on the bottom box extension base 31, and the second laser alignment sensor 43 is fixedly mounted on the cover box extension base 41, and the first laser alignment sensor 33 and the second laser alignment sensor 43 are correspondingly arranged before the initial assembly, so as to realize the assembly deviation of the second laser alignment sensor 43 based on the comparison of the first laser alignment sensor 33 positioned in the pre-debugging before and after the assembly process of the bottom box body 11 and the cover box body 12, thereby further effectively ensuring the accuracy of the multi-position displacement monitoring values, and significantly improving the functional stability and practicality of the overall architecture.

[0086] Please refer to Figure 2 The embodiment of the present invention further provides a method for aligning and installing the steam turbine axial displacement monitoring alignment and installation framework, which specifically includes the following steps:

[0087] S101: Determine the axial displacement zero position of the transmission shaft disc structure 2, and further pre-debug the monitoring distance between the bottom box alignment distance measurement structure 3 and the transmission shaft disc structure 2 based on the transmission shaft disc structure 2;

[0088] Specifically, the axial displacement zero position of the transmission main shaft 21 and the metal measuring disk 22 in the transmission shaft disk structure 2 is determined by the thrust disk shoe of the steam turbine generator set structure, and the distance between the first eddy current sensor 32 and the metal measuring disk 22 in the bottom box alignment distance measurement structure 3 is further pre-adjusted, so that the position of the metal measuring disk 22 measured based on the current generated by the alternating magnetic field of the first eddy current sensor 32 corresponds to the axial displacement zero position;

[0089] S102: pre-starting the bottom box alignment and distance measurement structure 3, and monitoring in real time the offset of the transmission shaft disc structure 2 based on the axial displacement zero position during the assembly process of the steam turbine box structure 1 through the bottom box alignment and distance measurement structure 3;

[0090] Specifically, the first eddy current sensor 32 is pre-started, and the bottom box body 11 and the cover box body 12 in the steam turbine casing structure 1 are assembled using fasteners, and the offset x of the metal measuring disk 22 based on the axial displacement zero position during the assembly process is monitored in real time by the first eddy current sensor 32 in the started state;

[0091] S103: continue to pre-start the cover box alignment and distance measurement structure 4, and monitor in real time the assembly deviation of the cover box alignment and distance measurement structure 4 based on the bottom box alignment and distance measurement structure 3 during the assembly process of the steam turbine box structure 1;

[0092] Specifically, continue to pre-start the first laser alignment sensor 33 in the bottom box alignment and distance measurement structure 3 and the second laser alignment sensor 43 in the cover box alignment and distance measurement structure 4;

[0093] After the bottom box body 11 and the cover box body 12 are assembled, the assembly deviation y of the second laser alignment sensor 43 based on the pre-debugging positioning of the first laser alignment sensor 33 is determined by comparison;

[0094] S104: adjusting the offset value according to the axial displacement of the transmission shaft disc structure 2, and further adjusting the assembly deviation value according to the cover box alignment distance measurement structure 4;

[0095] Specifically, when the steam turbine generator set structure is running in a hot state, the axial displacement of the transmission main shaft 21 and the metal measuring disk 22 is pre-increased by the offset x value, and the distance between the second laser alignment sensor 43 and the metal measuring disk 22 is further pre-increased by the assembly deviation y value to improve monitoring accuracy.

[0096] like Figure 3 and Figure 4As shown, the embodiment of the present invention also provides a steam turbine axial displacement monitoring and verification system, which includes the above-mentioned steam turbine axial displacement monitoring alignment installation structure, and also includes an axial displacement transmission structure 5, a synchronous displacement structure 6, a displacement ruler structure 7 and a visual probe structure 8, which is used to synchronize the axial displacement of the main shaft 21 and the metal measuring disk 22 in real time through the axial displacement transmission structure 5, and can further use the synchronous displacement structure 6 to correspond the synchronized axial displacement to the displacement ruler structure 7, thereby forming a mechanical overall axial displacement monitoring structure, and then can use the visual probe structure 8 to obtain the corresponding to the real-time axial displacement of the main shaft 21 and the metal measuring disk 22. The axial displacement of the displacement measuring scale structure 7 is realized by coordinating with the eddy current sensor to monitor the axial displacement of the transmission main shaft 21 and the metal measuring disk 22. At the same time, the voltage attenuation of the eddy current sensor can be compared and verified based on the mechanical structure, thereby significantly improving the accuracy of the axial displacement monitoring value during the maintenance cycle. In addition, the visual probe structure 8 can be directly judged when a fault occurs, thereby clarifying the maintenance node to stably maintain the coordinated monitoring and comparison verification functions, further significantly improving the accuracy of the axial displacement monitoring. The specific settings are as follows:

[0097] Please refer to Figure 3 and Figure 4 The axial shift transmission structure 5 includes a shift transmission bearing seat 51 and a shift transmission arm 52, and the shift transmission bearing seat 51 has a coaxial rotation inner ring 511 and a shift transmission outer ring 512 respectively; wherein the coaxial rotation inner ring 511 is transmission-sleeved and assembled on the transmission main shaft 21, so that the coaxial rotation inner ring 511 can rotate synchronously based on the transmission main shaft 21; the shift transmission outer ring 512 is sleeved and assembled on the outer side of the coaxial rotation inner ring 511, and the shift transmission outer ring 512 is transmission-fixedly connected to one end of the shift transmission arm 52, so that the shift transmission outer ring 512 can remain stationary corresponding to the rotation direction of the coaxial rotation inner ring 511, and at the same time, the shift transmission outer ring 512 can achieve synchronous axial displacement based on the coaxial rotation inner ring 511 and the transmission main shaft 21.

[0098] The synchronous shift structure 6 includes a directional guide seat 61 and a synchronous shift slider 62; wherein the directional guide seat 61 is fixedly mounted on the inner wall of the bottom box body 11, and the extension direction of the directional guide seat 61 is parallel to the axial direction of the transmission main shaft 21; the synchronous shift slider 62 is slidably mounted on the directional guide seat 61, and the synchronous shift slider 62 is transmission-fixedly connected to the other end of the shift transmission arm 52, so that the shift transmission arm 52 can be used to shift the transmission arm 52 based on the shift transmission arm 52. The axial displacement of the transmission outer ring 512 further drives the synchronous shift slider 62 to perform synchronous and equal shifting along the directional guide seat 61; the displacement measuring scale structure 7 and the directional guide seat 61 are fixedly connected and extended in the same direction, and the synchronous shift slider 62 is provided with a scale pointer corresponding to the displacement measuring scale structure 7, so that when the synchronous shift slider 62 performs synchronous and equal shifting along the directional guide seat 61, the scale pointer of the synchronous shift slider 62 can synchronously correspond to the axial displacement value based on the displacement measuring scale structure 7.

[0099] Please continue to refer to Figure 3 The visual probe structure 8 is fixedly mounted on the synchronous shift slider 62, and the visual probe structure 8 is arranged corresponding to the scale pointer of the synchronous shift slider 62, so as to obtain the axial displacement value corresponding to the scale pointer of the synchronous shift slider 62 in real time through the visual probe structure 8, so as to realize the coordinated monitoring of the axial displacement of the transmission main shaft 21 with the eddy current sensor, and at the same time, the voltage attenuation degree of the eddy current sensor can be compared and verified by the overall mechanical architecture, thereby improving the accuracy of the axial displacement monitoring value. In addition, with the help of the intuitive performance characteristics of the visual probe structure 8, it can be directly judged when a fault occurs in the visual probe structure 8, so that the maintenance node can be more clearly defined to stably maintain the coordinated monitoring and comparison verification functions, and the accuracy of the axial displacement monitoring is further improved.

[0100] Please refer to Figure 5 The embodiment of the present invention further provides a verification method according to the above-mentioned steam turbine axial displacement monitoring verification system, which specifically includes the following steps:

[0101] S201: Acquire the axial displacement of the transmission shaft disc structure 2 based on the alignment and distance measurement structure monitoring;

[0102] Specifically, the axial displacement of the transmission main shaft 21 and the metal measuring disc 22 in the transmission shaft disc structure 2 is monitored and obtained based on the cooperation between the first eddy current sensor 32 of the bottom box alignment and distance measurement structure 3 and the second eddy current sensor 42 of the cover box alignment and distance measurement structure 4;

[0103] S202: The axial displacement of the shaft disc structure 2 is synchronized in real time by the axial displacement transmission structure 5, and the synchronized axial displacement is further matched to the displacement measuring scale structure 7 by the synchronized displacement structure 6, so as to form a mechanical overall axial displacement monitoring framework;

[0104] Specifically, the axial displacement of the main shaft 21 and the metal measuring disk 22 is synchronously transmitted in real time through the shift transmission bearing seat 51 in the axial shift transmission structure 5, and the synchronous shift slider 62 in the synchronous shift structure 6 is further driven by the shift transmission bearing seat 51 to synchronously and equally shift along the directional guide rail seat 61;

[0105] When the synchronous shifting slider 62 is synchronously shifted along the directional guide rail seat 61, the scale pointer of the synchronous shifting slider 62 is synchronously corresponding to the corresponding value of the axial displacement based on the shifting ruler structure 7;

[0106] S203: acquiring the axial displacement corresponding to the displacement measuring ruler structure 7 in real time through the visual probe structure 8;

[0107] Specifically, the corresponding value of the axial displacement of the scale pointer of the synchronous shift slider 62 corresponding to the shift measuring scale structure 7 is obtained in real time through the visual probe structure 8, so as to use the visual probe structure 8 to complete the coordinated monitoring of the axial displacement of the transmission main shaft 21 and the metal measuring disk 22 with the eddy current sensor;

[0108] S204: The axial displacement corresponding to the displacement measuring structure 7 is obtained by the visual probe structure 8 and compared with the axial displacement of the transmission shaft disc structure 2 obtained by the alignment distance measuring structure, and the voltage attenuation degree of the eddy current sensor is verified based on the comparison result feedback, so as to make targeted monitoring adjustments;

[0109] At the same time, when the visual probe structure 8 clearly fails, the failed node is directly used as the maintenance node of the visual probe structure 8 to stably maintain the collaborative monitoring and comparison verification functions.

[0110] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A steam turbine axial displacement monitoring alignment installation structure, characterized in that: include: The transmission shaft disc structure comprises a transmission main shaft and a metal measuring disc which is fixedly connected to the transmission main shaft; The bottom box alignment and distance measurement structure comprises a first eddy current sensor and a first laser alignment sensor; the probe end of the first eddy current sensor and the metal measuring disk are arranged to maintain a pre-debugging distance corresponding to each other; The cover box alignment and distance measuring structure can be fastened, assembled and connected with the bottom box alignment and distance measuring structure; The cover box alignment and distance measurement structure comprises a cover box extension base and a second eddy current sensor and a second laser alignment sensor respectively fixedly arranged on the cover box extension base; When the cover box alignment and ranging structure and the bottom box alignment and ranging structure are corresponding to each other and are not tightly assembled and connected, the second eddy current sensor and the first eddy current sensor as well as the first laser alignment sensor and the second laser alignment sensor are all arranged correspondingly.

2. The steam turbine axial displacement monitoring alignment installation structure according to claim 1 is characterized in that: Also includes: The steam turbine casing structure comprises a bottom casing and a cover casing which can be fastened and assembled in connection; The bottom box extension base is fixedly mounted on the inner wall of the bottom box; The cover box extension base is fixedly mounted on the inner wall of the cover box; The second eddy current sensor is arranged correspondingly to the installation position of the cover box body based on the installation position of the first eddy current sensor based on the bottom box body before initial assembly, and the first laser alignment sensor and the second laser alignment sensor are arranged correspondingly before initial assembly.

3. A method for aligning and installing the steam turbine axial displacement monitoring aligning and installing structure according to claim 2, characterized in that: The steps include: Determine the axial displacement zero position of the transmission shaft disc structure, and further pre-debug the monitoring distance between the bottom box alignment distance measurement structure and the transmission shaft disc structure based on the transmission shaft disc structure; Pre-start the bottom box alignment and distance measurement structure, and use the bottom box alignment and distance measurement structure to monitor in real time the offset of the transmission shaft disc structure based on the axial displacement zero position during the assembly process of the turbine box structure; Continue to pre-start the cover box alignment and distance measurement structure, and monitor the assembly deviation of the cover box alignment and distance measurement structure based on the bottom box alignment and distance measurement structure in the steam turbine box structure assembly process in real time; The offset value is adjusted according to the axial displacement of the transmission shaft disc structure, and the assembly deviation value is further adjusted according to the cover box alignment and distance measurement structure.

4. The method for aligning and installing the steam turbine axial displacement monitoring aligning and installing structure according to claim 3 is characterized in that: The following steps are also included: The determining of the axial displacement zero position of the transmission shaft disc structure and further pre-debugging the monitoring distance between the bottom box alignment distance measurement structure and the transmission shaft disc structure based on the transmission shaft disc structure specifically includes: The axial displacement zero position of the transmission main shaft and the metal measuring disk in the transmission shaft disk structure is determined by the thrust disk shoe of the steam turbine generator set structure, and the distance between the first eddy current sensor and the metal measuring disk in the bottom box alignment distance measurement structure is further pre-adjusted so that the position of the metal measuring disk measured based on the current generated by the alternating magnetic field of the first eddy current sensor corresponds to the axial displacement zero position; The pre-starting bottom box alignment and distance measurement structure and real-time monitoring of the offset of the transmission shaft disc structure based on the axial displacement zero position during the assembly process of the steam turbine box structure through the bottom box alignment and distance measurement structure specifically include: Pre-starting the first eddy current sensor, and assembling the bottom box body and the cover box body in the steam turbine box structure by using fasteners, and monitoring the offset x of the metal measuring disk based on the axial displacement zero position in the assembly process in real time by using the first eddy current sensor in the started state; The method of continuing to pre-start the cover box alignment and distance measurement structure and real-time alignment monitoring of the assembly deviation of the cover box alignment and distance measurement structure based on the bottom box alignment and distance measurement structure during the steam turbine box structure assembly process specifically includes: Continue to pre-start the first laser alignment sensor in the bottom box alignment and distance measurement structure and the second laser alignment sensor in the cover box alignment and distance measurement structure; After the bottom box body and the cover box body are assembled, the assembly deviation y of the first laser alignment sensor positioned by the second laser alignment sensor based on the pre-adjustment positioning is determined by comparison.

5. The method for aligning and installing the steam turbine axial displacement monitoring aligning and installing structure according to claim 4, characterized in that: The following steps are also included: The offset value is adjusted for the axial displacement of the transmission shaft disc structure, and the assembly deviation value is further adjusted for the cover box alignment distance measurement structure, specifically including: When the turbine generator set structure is running in a hot state, the offset x value is pre-increased for the axial displacement of the transmission main shaft and the metal measuring disk, and the assembly deviation y value is further pre-increased for the distance between the second laser alignment sensor and the metal measuring disk, thereby improving the accuracy of axial displacement monitoring.

6. A steam turbine axial displacement monitoring and verification system, characterized in that: The steam turbine axial displacement monitoring alignment installation structure as claimed in claim 2, wherein the verification system further comprises: The axial displacement transmission structure comprises a displacement transmission bearing seat, wherein the displacement transmission bearing seat has a coaxial displacement inner ring and a displacement transmission outer ring; the coaxial displacement inner ring transmission sleeve is assembled on the transmission main shaft, and the displacement transmission outer ring sleeve is assembled on the outer side of the coaxial displacement inner ring; A synchronous shifting structure is fixedly mounted on the bottom box, and the synchronous shifting structure has a sliding shifting end portion, the sliding direction of the sliding shifting end portion is arranged parallel to the axial direction of the transmission main shaft, and the sliding shifting end portion is transmission-fixedly connected to the shifting transmission outer ring; A displacement measuring ruler structure is fixedly connected to the synchronous displacement structure, and the displacement measuring ruler structure and the sliding direction of the sliding displacement end portion are correspondingly extended in the same direction; The visual probe structure is fixedly mounted on the sliding displacement end of the synchronous displacement structure, and the input end of the visual probe structure is correspondingly arranged with the displacement measuring ruler structure.

7. The steam turbine axial displacement monitoring and verification system according to claim 6, characterized in that: The synchronous displacement structure includes a directional guide rail seat; The sliding displacement end is configured as a synchronous displacement slider; The directional guide rail seat is fixedly mounted on the inner wall of the bottom box body, and the extension direction of the directional guide rail seat is parallel to the axial direction of the transmission main shaft; The synchronous shift slider is slidably mounted on the directional guide rail seat, and the synchronous shift slider is transmission-fixedly connected to the shift transmission outer ring through a shift transmission arm; The displacement measuring ruler structure and the directional guide rail seat are arranged to extend in the same direction and be fixedly connected; The synchronous shifting slider is provided with a scale pointer corresponding to the shifting ruler structure; The visual probe structure is fixedly mounted on the synchronous shifting slider, and the visual probe structure is arranged correspondingly to the scale pointer of the synchronous shifting slider and the shifting ruler structure.

8. A verification method for a steam turbine axial displacement monitoring verification system according to claim 7, characterized in that: The steps include: Obtain the axial displacement of the transmission shaft disc structure based on the alignment and distance measurement structure monitoring; The axial displacement of the shaft disc structure is synchronized in real time through the axial displacement transmission structure, and the synchronized axial displacement is further matched to the displacement measuring scale structure by using the synchronized displacement transmission structure, so as to form a mechanical overall axial displacement monitoring framework; The axial displacement corresponding to the displacement measuring ruler structure is obtained in real time through the visual probe structure; The axial displacement corresponding to the displacement measuring scale structure is obtained through the visual probe structure, and compared with the axial displacement of the transmission shaft disc structure obtained by the alignment distance measuring structure monitoring. The voltage attenuation degree of the eddy current sensor is verified based on the comparison result feedback, so as to make targeted monitoring adjustments. At the same time, when a visual probe structure clearly fails, the failed node is directly used as the maintenance node of the visual probe structure to stably maintain the collaborative monitoring and comparison verification functions.

9. The verification method of the steam turbine axial displacement monitoring verification system according to claim 8, characterized in that: The following steps are also included: The method of obtaining the axial displacement of the transmission shaft disc structure based on the alignment and distance measurement structure monitoring specifically includes: The first eddy current sensor based on the bottom box alignment and distance measurement structure cooperates with the second eddy current sensor based on the cover box alignment and distance measurement structure to monitor and obtain the axial displacement of the transmission main shaft and the metal measuring disk in the transmission shaft disk structure; The axial displacement of the shaft disc structure is synchronously transmitted in real time through the axial displacement transmission structure, and the synchronous displacement structure is further used to correspond the synchronized axial displacement to the displacement measuring structure to form a mechanical overall axial displacement monitoring architecture, which specifically includes: The axial displacement of the main shaft and the metal measuring disk is synchronously transmitted in real time through the shift transmission bearing seat in the axial shift transmission structure, and the synchronous shift slider in the synchronous shift structure is further driven to synchronously shift along the directional guide rail seat by the shift transmission bearing seat; When the synchronous shifting slider performs synchronous equal shifting along the directional guide rail seat, the scale pointer of the synchronous shifting slider synchronously corresponds to the corresponding value of the axial displacement based on the shifting ruler structure.

10. The verification method of the steam turbine axial displacement monitoring verification system according to claim 9, characterized in that: The following steps are also included: The real-time acquisition of the axial displacement corresponding to the displacement measuring ruler structure by the visual probe structure specifically includes: The corresponding numerical value of the axial displacement of the shift measuring structure corresponding to the scale pointer of the synchronous shift slider is obtained in real time through the visual probe structure, so as to utilize the visual probe structure to complete the coordinated monitoring of the axial displacement of the transmission spindle and the metal measuring disk with the eddy current sensor.

Images