Axial displacement monitoring equipment for steam turbine generator unit

Abstract

The utility model provides a steam turbine generator unit axial displacement monitoring device which comprises a steam turbine generator unit displacement monitoring assembly, an axial moving assembly and a profile steel fixing seat. An eddy current sensor is arranged on a steam turbine generator unit monitoring seat in the steam turbine generator unit displacement monitoring assembly; the eddy current sensor is used for detecting the axial displacement condition of a steam turbine generator unit rotor, the steam turbine generator unit monitoring base is driven by a first motor, a first motor encoder is arranged on the first motor, the upper portion of the axial moving assembly is connected with the steam turbine generator unit displacement monitoring assembly through a connecting plate, and the axial moving assembly is driven by a second motor. A second motor encoder is arranged on the second motor, the first motor encoder and the second motor encoder are both connected with an eddy current sensor, and the lower portion of the axial moving assembly is connected with a profile steel fixing base. The axial displacement monitoring equipment for the steam turbine generator unit can accurately detect the axial displacement condition of the rotor of the steam turbine generator unit and reflect the running state of the rotor in real time.

Description

Technical Field

[0001] This utility model relates to axial displacement monitoring equipment for steam turbine generator sets, and more particularly to an axial displacement monitoring equipment for steam turbine generator sets. Background Technology

[0002] Steam turbine generator sets are key equipment for converting thermal energy into electrical energy, and are widely used in thermal power plants, nuclear power plants, and certain industrial facilities. During operation, the axial displacement between the rotor and stator of a steam turbine generator set may change due to various factors (such as thermal expansion, mechanical vibration, and bearing wear). Abnormal changes in axial displacement not only affect the unit's operating efficiency but may also lead to serious mechanical failures, such as rotor-stator collisions, or even unit shutdowns. Therefore, real-time monitoring of axial displacement is particularly important.

[0003] Currently, traditional axial displacement monitoring methods typically employ mechanical or inductive displacement sensors, which are insufficient to detect minute axial displacements occurring in the early stages of rotor operation. This leads to the failure to detect potential problems in a timely manner, delays in rotor shaft maintenance, and accelerates damage to turbine rotor shaft components. Furthermore, the position of the monitoring equipment is easily affected by the operation of the generator set, causing changes in the sensor's position and impacting the accuracy and reliability of the monitoring. Utility Model Content

[0004] In view of this, the present invention aims to propose an axial displacement monitoring device for steam turbine generator sets, in order to solve the problems of traditional axial displacement monitoring methods, which usually use mechanical or inductive displacement sensors, making it difficult to detect the minute axial displacement that occurs in the early stages of the rotor. This leads to the inability to detect potential problems in time, delays in the maintenance of the rotor shaft, and accelerates the damage to the turbine rotor shaft components. Furthermore, the position of the monitoring device is easily affected by the operation of the generator set, causing the sensor position to change, which affects the accuracy and reliability of the monitoring.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] This utility model provides an axial displacement monitoring device for a steam turbine generator set, including a steam turbine generator set displacement monitoring component, an axial movement component, and a steel frame fixing base. The steam turbine generator set displacement monitoring component has an eddy current sensor mounted on the monitoring base. The eddy current sensor is used to detect the axial displacement of the steam turbine generator set rotor. The steam turbine generator set monitoring base is driven by a first motor, which has a first motor encoder. The upper part of the axial movement component is connected to the steam turbine generator set displacement monitoring component via a connecting plate. The axial movement component is driven by a second motor, which has a second motor encoder. Both the first motor encoder and the second motor encoder are connected to the eddy current sensor. The lower part of the axial movement component is connected to the steel frame fixing base.

[0007] Furthermore, in the turbine generator set displacement monitoring assembly, a first motor is connected to a first lead screw via a first coupling, and the first lead screw is connected to a second lead screw via a lead screw coupling. The first and second lead screws have the same length but different directions of rotation. Both ends of the first and second lead screws are connected to a first lead screw support seat via bearings. The second lead screw is connected to a turbine generator set monitoring seat via a second lead screw nut, and the first lead screw is connected to the turbine generator set monitoring seat via a first lead screw nut. The first lead screw support seat is locked to a first mounting plate. The first motor is fixed to the first mounting plate via a motor mounting seat. A first guide rail mounting seat is symmetrically fixed to the first mounting plate. A first guide rail is fixed on the first guide rail mounting seat, and a first slider is slidably mounted on the first guide rail. The turbine generator set monitoring seat is symmetrically mounted with the first slider.

[0008] Furthermore, the turbine generator set monitoring base located on the second lead screw and the turbine generator set monitoring base located on the first lead screw are provided with semi-circular grooves on their upper parts, and the two semi-circular grooves are installed symmetrically.

[0009] Furthermore, in the axial movement assembly, the second motor is fixed to the second mounting plate, the guide rod support is fixed to the second mounting plate, the second motor is connected to the third lead screw through the second coupling, the third lead screw is connected to the third lead screw support through the bearing, the third lead screw support is fixed to the second mounting plate, the guide rod is connected to the connecting plate through the linear bearing, the linear bearing is symmetrically arranged with respect to the two center lines of the connecting plate, and the linear bearing is slidably mounted on the guide rod.

[0010] Furthermore, a first limiting device and a second limiting device are fixed on the second mounting plate. The first limiting device is located at the maximum forward displacement of the second mounting plate, and the second limiting device is located at the maximum backward displacement of the second mounting plate. The first limiting device and the second limiting device are connected to the second motor encoder. The first limiting device and the second limiting device have the same structure, both including a limiting baffle and a photoelectric sensor. The limiting baffle is locked to the side of the connecting plate, and the photoelectric sensor is fixed on the second mounting plate. The vertical section of the limiting baffle that bends downward is directly opposite the center slot of the photoelectric sensor.

[0011] Furthermore, the first supporting steel and the second supporting steel in the steel fixing seat are welded and fixed, and the second mounting plate is locked on the second supporting steel.

[0012] Compared with existing technologies, the turbine generator set axial displacement monitoring device of this utility model has the following advantages:

[0013] This invention, by installing an eddy current sensor on a turbine generator set monitoring base, can accurately detect the axial displacement of the turbine generator set rotor, reflecting the rotor's operating status in real time and providing accurate data support for timely detection of potential problems. The turbine generator set monitoring base is driven by a first motor and equipped with a first motor encoder, allowing for flexible adjustment of the monitoring base's position according to actual needs. This ensures the eddy current sensor is always in the optimal monitoring position, improving monitoring accuracy and reliability. The axial movement component is driven by a second motor, whose encoder precisely controls its movement distance and speed, enabling the entire monitoring equipment to adapt to different installation environments and monitoring requirements. Precise axial position adjustment is possible, ensuring effective axial displacement monitoring under various operating conditions. Both the first and second motor encoders are connected to the eddy current sensor, achieving integrated and coordinated processing of displacement monitoring data and motor control data. This helps to comprehensively adjust the relationship between axial displacement and monitoring equipment position adjustment, providing a basis for optimizing monitoring schemes and equipment control strategies.

[0014] The lower part of the central axial moving component of this utility model is connected to a steel fixing base, providing a stable support and foundation for the entire monitoring equipment. This reduces the impact of external vibrations and interference on monitoring accuracy, ensuring stable and reliable performance during long-term operation. The overall equipment is easy to maintain and debug. When it is necessary to calibrate, repair, or replace the eddy current sensor, it can be easily moved to a suitable position via motor control, improving the efficiency and safety of maintenance work. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the isometric projection of the turbine generator set axial displacement monitoring device described in this embodiment of the present invention;

[0018] Figure 2 This is a front view schematic diagram of the turbine generator set axial displacement monitoring device according to an embodiment of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. First motor; 2. First lead screw support; 3. First guide rail; 4. First lead screw; 5. First mounting plate; 6. First guide rail mounting seat; 7. First slider; 8. Steam turbine generator set monitoring seat; 9. Lead screw coupling; 10. Second lead screw; 11. First support steel; 12. Second support steel; 13. Second mounting plate; 14. Third lead screw; 15. Guide rod; 16. Connecting plate; 17. Second motor; 18. Linear bearing; 19. Third lead screw support; 20. Guide rod support; 21. Limiting stop; 22. Photoelectric sensor. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] See Figures 1-2 As shown, this embodiment provides an axial displacement monitoring device for a steam turbine generator set, including a steam turbine generator set displacement monitoring component, an axial movement component, and a steel frame fixing base. The steam turbine generator set monitoring base 8 in the steam turbine generator set displacement monitoring component is equipped with an eddy current sensor, which is used to detect the axial displacement of the steam turbine generator set rotor. The steam turbine generator set monitoring base 8 is driven by a first motor 1, which is equipped with a first motor encoder. The upper part of the axial movement component is connected to the steam turbine generator set displacement monitoring component via a connecting plate 16. The axial movement component is driven by a second motor 17, which is equipped with a second motor encoder. Both the first motor encoder and the second motor encoder are connected to the eddy current sensor. The lower part of the axial movement component is connected to the steel frame fixing base.

[0026] Specifically, in this embodiment, in the turbine generator set displacement monitoring assembly, the first motor 1 is connected to the first lead screw 4 via a first coupling, the first lead screw 4 is connected to the second lead screw 10 via a lead screw coupling 9, the first lead screw 4 and the second lead screw 10 have the same length but different directions of rotation, both ends of the first lead screw 4 and the second lead screw 10 are connected to the first lead screw support seat 2 via bearings, the second lead screw 10 is connected to the turbine generator set monitoring seat 8 via a second lead screw nut, the first lead screw 4 is connected to the turbine generator set monitoring seat 8 via a first lead screw nut, the first lead screw support seat 2 is locked onto the first mounting plate 5, the first motor 1 is fixed onto the first mounting plate 5 via a motor mounting seat, the first guide rail mounting seat 6 is symmetrically fixed onto the first mounting plate 5, the first guide rail 3 is fixed onto the first guide rail mounting seat 6, the first slider 7 is slidably installed on the first guide rail 3, and the first slider 7 is symmetrically installed on the turbine generator set monitoring seat 8.

[0027] Specifically, in this embodiment, the turbine generator set monitoring seat 8 on the second lead screw 10 and the turbine generator set monitoring seat 8 on the first lead screw 4 are provided with semi-circular grooves on their upper parts, and the two semi-circular grooves are installed symmetrically.

[0028] Specifically, in this embodiment, in the axial movement assembly, the second motor 17 is fixed on the second mounting plate 13, the guide rod support 20 is fixed on the second mounting plate 13, the second motor 17 is connected to the third lead screw 14 through the second coupling, the third lead screw 14 is connected to the third lead screw support 19 through the bearing, the third lead screw support 19 is fixed on the second mounting plate 13, the guide rod 15 is connected to the connecting plate 16 through the linear bearing, the linear bearing 18 is symmetrically arranged with respect to the two center lines of the connecting plate 16, and the linear bearing 18 is slidably mounted on the guide rod 15.

[0029] Specifically, in this embodiment, a first limiting device and a second limiting device are fixed on the second mounting plate 13. The first limiting device is located at the maximum forward displacement of the second mounting plate 13, and the second limiting device is located at the maximum backward displacement of the second mounting plate 13. The first limiting device and the second limiting device are connected to the second motor encoder. The first limiting device and the second limiting device have the same structure, both including a limiting baffle 21 and a photoelectric sensor 22. The limiting baffle 21 is locked to the side of the connecting plate 16, and the photoelectric sensor 22 is fixed on the second mounting plate 13. The vertical section of the limiting baffle 21 that bends downward is directly opposite the center slot of the photoelectric sensor 22.

[0030] The first limiting device is located at the maximum forward displacement of the second mounting plate, and the second limiting device is located at the maximum backward displacement of the second mounting plate. Its structure is similar to that of the first limiting device, and it can be a limit switch.

[0031] Specifically, in this embodiment, the first supporting steel 11 and the second supporting steel 12 in the steel fixing seat are welded and fixed, and the second mounting plate 13 is locked on the second supporting steel 12.

[0032] The axial displacement monitoring equipment for steam turbine generator sets, by installing eddy current sensors on the monitoring base, can accurately detect the axial displacement of the turbine generator set rotor, reflecting the rotor's operating status in real time and providing accurate data support for timely detection of potential problems. The monitoring base is driven by a first motor and equipped with a first motor encoder, allowing for flexible adjustment of the base's position as needed to ensure the eddy current sensor is always in the optimal monitoring position, improving monitoring accuracy and reliability. The axial movement component is driven by a second motor, whose encoder precisely controls its movement distance and speed, enabling the entire monitoring equipment to adapt to different installation environments and monitoring requirements. It allows for precise axial position adjustment, ensuring effective axial displacement monitoring under various operating conditions. Both the first and second motor encoders are connected to the eddy current sensor, achieving integrated and coordinated processing of displacement monitoring data and motor control data. This helps to comprehensively adjust the relationship between axial displacement and monitoring equipment position adjustment, providing a basis for optimizing monitoring schemes and equipment control strategies.

[0033] The lower part of the axial movement assembly is connected to a steel fixing base, providing stable support and foundation for the entire monitoring equipment. This reduces the impact of external vibrations and interference on monitoring accuracy, ensuring stable and reliable performance during long-term operation. The overall equipment is easy to maintain and debug. When it is necessary to calibrate, repair, or replace the eddy current sensor, it can be easily moved to a suitable position via motor control, improving the efficiency and safety of maintenance work.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steam turbine generator set axial displacement monitoring apparatus, characterized by, The utility model relates to a steam turbine generator set displacement monitoring assembly, axial movement assembly, section steel fixed seat, the steam turbine generator set displacement monitoring assembly in steam turbine generator set monitoring seat (8) on be equipped with eddy current sensor, the eddy current sensor is used for detecting steam turbine generator set rotor axial displacement condition, steam turbine generator set monitoring seat (8) is driven by first motor (1), first motor (1) is equipped with first motor encoder, the upper portion of axial movement assembly is connected with steam turbine generator set displacement monitoring assembly through connecting plate (16), axial movement assembly is driven by second motor (17), second motor (17) is equipped with second motor encoder, first motor encoder, second motor encoder are connected with the eddy current sensor, the lower portion of axial movement assembly is connected section steel fixed seat.

2. The steam turbine generator set axial displacement monitoring apparatus according to claim 1, characterized by, In the steam turbine generator set displacement monitoring assembly, the first motor (1) is connected with the first screw rod (4) through the first shaft coupling, the first screw rod (4) is connected with the second screw rod (10) through the screw rod shaft coupling (9), the first screw rod (4) and the second screw rod (10) are same in length and different in rotation direction, the first screw rod (4) and the second screw rod (10) are connected with the first screw rod support seat (2) through bearings at both ends, the second screw rod (10) is connected with the steam turbine generator set monitoring seat (8) through the second screw rod nut, the first screw rod (4) is connected with the steam turbine generator set monitoring seat (8) through the first screw rod nut, the first screw rod support seat (2) is locked on the first mounting plate (5), the first motor (1) is fixed on the first mounting plate (5) through the motor mounting seat, the first guide rail mounting seat (6) is symmetrically fixed on the first mounting plate (5), the first guide rail (3) is fixed on the first guide rail mounting seat (6), the first slide block (7) is slidingly installed on the first guide rail (3), and the steam turbine generator set monitoring seat (8) is symmetrically installed on the first slide block (7).

3. The steam turbine generator set axial displacement monitoring apparatus according to claim 2, wherein, The steam turbine generator set monitoring seat (8) arranged on the second screw rod (10) and the steam turbine generator set monitoring seat (8) arranged on the upper portion of the first screw rod (4) are provided with semicircular grooves, and the two semicircular grooves are symmetrically installed.

4. The steam turbine generator set axial displacement monitoring apparatus according to claim 1, wherein, In the axial movement assembly, the second motor (17) is fixed on the second mounting plate (13), the guide rod support seat (20) is fixed on the second mounting plate (13), the second motor (17) is connected with the third screw rod (14) through the second shaft coupling, the third screw rod (14) is connected with the third screw rod support seat (19) through bearings, the third screw rod support seat (19) is fixed on the second mounting plate (13), the guide rod (15) is connected with the connecting plate (16) through the linear bearing, the linear bearings (18) are symmetrically arranged on the two center lines of the connecting plate (16), and the linear bearings (18) are slidingly installed on the guide rod (15).

5. The steam turbine generator set axial displacement monitoring apparatus according to claim 4, wherein, The first limiting device and the second limiting device are fixed on the second mounting plate (13), the first limiting device is located at the maximum displacement of the forward movement of the second mounting plate (13), the second limiting device is located at the maximum displacement of the backward movement of the second mounting plate (13), the first limiting device and the second limiting device are connected with the second motor encoder, the first limiting device and the second limiting device are the same in structure and each comprises a limiting baffle (21) and a photoelectric sensor (22), the limiting baffle (21) is locked on the side of the connecting plate (16), the photoelectric sensor (22) is fixed on the second mounting plate (13), and the vertical section of the limiting baffle (21) which is bent downward faces the center slot of the photoelectric sensor (22).

6. The steam turbine generator set axial displacement monitoring apparatus according to claim 1, wherein, The first supporting profile steel (11) and the second supporting profile steel (12) are welded and fixed in the profile steel fixing seat, and the second supporting profile steel (12) is locked with the second mounting plate (13).

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