A steam turbine rotor eccentricity monitoring device

Abstract

The present invention provides a device for monitoring turbine rotor eccentricity, comprising: a first monitoring ring mounted at one end of the turbine shaft, a second monitoring ring mounted at the other end of the turbine shaft, and a mounting for securing the first and second monitoring rings; the first monitoring ring being positioned proximate to the turbine's main impeller, the second monitoring ring being positioned proximate to the turbine's largest impeller, and both the first and second monitoring rings being coaxially disposed with the turbine shaft; a monitoring unit being mounted on each of the first and second monitoring rings, each monitoring unit monitoring the shortest distance from a monitoring point to the turbine shaft, each monitoring unit being connected to a processor, which processes the shortest distance to determine the eccentricity of the turbine shaft. The present invention installs monitoring rings at each end of the turbine shaft, and installs multiple sets of monitoring heads within the monitoring rings. The monitoring data collected by the monitoring heads is transmitted to a monitoring host, which calculates the monitoring data to determine the eccentricity of the turbine rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and in particular to a steam turbine rotor eccentricity monitoring device. Background Art

[0002] The steam turbine rotor is the general term for the rotating parts of a steam turbine. Its function is to collect the mechanical energy generated by each stage of the blade grid and transmit it to the generator rotor. The steam turbine rotor primarily consists of a main shaft, impeller or hub, moving blades, and couplings. Steam turbine rotor eccentricity refers to the deviation of the rotor's axis due to bending deformation. During turbine operation, the eccentricity of the steam turbine rotor is monitored. A significant eccentricity indicates significant bending deformation, and continued operation of the turbine will inevitably result in significant rotor vibration. The cause of the eccentricity must be identified and the eccentricity value must meet the standard before the turbine can be started.

[0003] In view of this, it is necessary to develop a steam turbine rotor eccentricity monitoring device to solve the above problems. Summary of the Invention

[0004] The present invention provides a steam turbine rotor eccentricity monitoring device, wherein monitoring rings are respectively installed at both ends of the steam turbine shaft, and multiple groups of monitoring heads are installed in the monitoring rings. The monitoring data collected by the monitoring heads are sent to a monitoring host, and the monitoring host calculates the monitoring data to obtain the eccentricity status of the steam turbine rotor.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A steam turbine rotor eccentricity monitoring device comprises: a first monitoring ring mounted on one end of a steam turbine shaft, a second monitoring ring mounted on the other end of the steam turbine shaft, and a fixing base for fixing the first monitoring ring and the second monitoring ring;

[0007] The first monitoring ring is arranged close to the main impeller of the steam turbine, and the second monitoring ring is arranged close to the largest impeller of the steam turbine. The first monitoring ring and the second monitoring ring are both arranged coaxially with the rotating shaft of the steam turbine;

[0008] The first monitoring ring and the second monitoring ring are both equipped with monitoring units. Each monitoring unit monitors the shortest distance from the monitoring point to the turbine shaft. Each monitoring unit is connected to a processor, which processes the shortest distance to obtain the eccentricity state of the turbine shaft.

[0009] A further improvement of the present invention is that both the first monitoring ring and the second monitoring ring rotate circumferentially around the axis of the turbine shaft;

[0010] A driving rotation component is installed on the fixing seat, and the driving rotation component drives the first monitoring ring and the second monitoring ring to rotate.

[0011] A further improvement of the present invention is that a monitoring ring motion monitoring module is installed on both the first monitoring ring and the second monitoring ring, and the monitoring ring motion monitoring module monitors the rotation state of the first monitoring ring or the second monitoring ring;

[0012] The monitoring ring motion monitoring module is connected to the processor, and the processor determines the states of the first monitoring ring and the second monitoring ring according to the rotation states.

[0013] A further improvement of the present invention is that a monitoring ring speed monitoring module is installed on both the first monitoring ring and the second monitoring ring, and the monitoring ring speed monitoring module monitors the rotation state of the first monitoring ring or the second monitoring ring;

[0014] The monitoring ring speed monitoring module is connected to the processor, and the processor determines the movement speed and movement acceleration of the first monitoring ring and the second monitoring ring according to the rotation state.

[0015] A further improvement of the present invention is that the first monitoring ring includes a first semicircular ring and a second semicircular ring, the first semicircular ring and the second semicircular ring are buckled into a circular ring, one of the first semicircular ring and the second semicircular ring is located on the fixed seat, and during the rotation of the first monitoring ring, the first semicircular ring and the second semicircular ring alternately contact the fixed seat, and the first semicircular ring and the second semicircular ring are both provided with a monitoring unit, a monitoring ring motion monitoring module, and a monitoring ring speed monitoring module;

[0016] The second monitoring ring includes a third semicircular ring and a fourth semicircular ring, and the third semicircular ring and the fourth semicircular ring are buckled into a circular ring. One of the third semicircular ring and the fourth semicircular ring is located on the fixed seat. During the rotation of the third monitoring ring, the third semicircular ring and the fourth semicircular ring alternately contact the fixed seat. The third semicircular ring and the fourth semicircular ring are both provided with a monitoring unit, a monitoring ring motion monitoring module and a monitoring ring speed monitoring module.

[0017] A further improvement of the present invention is that the monitoring unit of the first monitoring ring includes: multiple groups of first monitoring modules installed on the first semicircle ring, and multiple groups of second monitoring modules installed on the second semicircle ring. The multiple groups of first monitoring modules are distributed in the first semicircle ring at 90° to 120°, and the multiple groups of second monitoring modules are distributed in the second semicircle ring at 90° to 120°. The multiple groups of first monitoring modules and the multiple groups of first monitoring modules are all connected to the processor.

[0018] A further improvement of the present invention is that the monitoring unit of the second monitoring ring includes: multiple groups of third monitoring modules installed on the third semicircle ring, multiple groups of fourth monitoring modules installed on the fourth semicircle ring, the multiple groups of third monitoring modules are distributed in the third semicircle ring at 90° to 120°, and the multiple groups of fourth monitoring modules are distributed in the fourth semicircle ring at 90° to 120°, and the multiple groups of third monitoring modules and the multiple groups of fourth monitoring modules are all connected to the processor.

[0019] A further improvement of the present invention is that the first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module have the same structure;

[0020] The first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module all include a plurality of eddy current sensors having different resistance values. Each eddy current sensor is provided with a first resistor and a second resistor having different resistance values.

[0021] A further improvement of the present invention is that the diameters of the multiple eddy current sensors are different, and the multiple eddy current sensors include a maximum diameter eddy current sensor, a plurality of larger diameter eddy current sensors arranged around the maximum diameter eddy current sensor, a plurality of medium diameter eddy current sensors arranged around each larger diameter eddy current sensor, a plurality of smaller diameter eddy current sensors, and a plurality of minimum diameter eddy current sensors.

[0022] A further improvement of the present invention is that the maximum value of the monitoring distance of the eddy current sensor of each diameter is different;

[0023] Each diameter of the eddy-current sensor is connected to a processor.

[0024] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0025] The present invention installs monitoring rings at both ends of the turbine shaft, and installs multiple sets of monitoring heads in the monitoring rings. The monitoring data collected by the monitoring heads are sent to the monitoring host, and the monitoring host calculates the monitoring data to obtain the eccentricity status of the turbine rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a steam turbine rotor eccentricity monitoring device provided by the present invention Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of the first monitoring ring provided by the present invention;

[0028] Figure 3 A schematic diagram of a monitoring unit provided by the present invention;

[0029] Figure 4This is a diagram illustrating the motion conditions of the first monitoring ring and the second monitoring ring provided by the present invention.

[0030] Description of reference numerals:

[0031] 1- turbine shaft; 2- first monitoring ring; 3- second monitoring ring; 4- main impeller; 5- largest impeller; 6- first semicircular ring; 7- second semicircular ring; 8- monitoring unit; 9- monitoring ring motion monitoring module; 10- monitoring ring speed monitoring module; 11- larger diameter eddy current sensor; 12- medium diameter eddy current sensor; 13- smaller diameter eddy current sensor; 14- smallest diameter eddy current sensor. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0033] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0034] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0035] The terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0036] See also Figure 1An embodiment of the present invention provides a steam turbine rotor eccentricity monitoring device, comprising: a first monitoring ring 2 installed at one end of a steam turbine rotor shaft 1, a second monitoring ring 3 installed at the other end of the steam turbine rotor shaft 1, and a fixing seat for fixing the first monitoring ring 2 and the second monitoring ring 3; the first monitoring ring 2 is arranged close to the main impeller 4 of the steam turbine, the second monitoring ring 3 is arranged close to the largest impeller 5 of the steam turbine, and the first monitoring ring 2 and the second monitoring ring 3 are both arranged coaxially with the steam turbine rotor shaft 1; a monitoring unit 8 is installed on each of the first monitoring ring 2 and the second monitoring ring 3, each monitoring unit 8 monitors the shortest distance from the monitoring point to the steam turbine rotor shaft 1, and each monitoring unit 8 is connected to a processor, which processes the shortest distance to obtain the eccentricity state of the steam turbine rotor shaft 1.

[0037] Please continue reading Figure 1 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, preferably, the first monitoring ring 2 and the second monitoring ring 3 both rotate circumferentially around the axis of the steam turbine shaft 1; a driving rotation component is installed on the fixed seat, and the driving rotation component drives the first monitoring ring 2 and the second monitoring ring 3 to rotate.

[0038] See also Figure 1 and Figure 2 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, preferably, a monitoring ring motion monitoring module 9 is installed on both the first monitoring ring 2 and the second monitoring ring 3, and the monitoring ring motion monitoring module 9 monitors the rotation state of the first monitoring ring 2 or the second monitoring ring 3; the monitoring ring motion monitoring module 9 is connected to a processor, and the processor determines the state of the first monitoring ring 2 and the second monitoring ring 3 according to the rotation state.

[0039] See also Figure 1 and Figure 2 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, preferably, a monitoring ring speed monitoring module 10 is installed on both the first monitoring ring 2 and the second monitoring ring 3, and the monitoring ring speed monitoring module monitors the rotation state of the first monitoring ring 2 or the second monitoring ring 3; the monitoring ring speed monitoring module 10 is connected to a processor, and the processor determines the movement speed and movement acceleration of the first monitoring ring 2 and the second monitoring ring 3 according to the rotation state.

[0040] See also Figure 1 and Figure 2, a turbine rotor eccentricity monitoring device according to an embodiment of the present invention, preferably, the first monitoring ring 2 includes a first semicircular ring 6 and a second semicircular ring 7, the first semicircular ring 6 and the second semicircular ring 7 are buckled into a circular ring, and one of the first semicircular ring 6 and the second semicircular ring 7 is located at a fixed seat, and during the rotation of the first monitoring ring 2, the first semicircular ring 6 and the second semicircular ring 7 alternately contact the fixed seat, and the first semicircular ring 6 and the second semicircular ring 7 are both provided with a monitoring unit 8, a monitoring ring motion monitoring module 9 and a monitoring ring speed monitoring module 10; the second monitoring ring 3 includes a third semicircular ring and a fourth semicircular ring, the third semicircular ring and the fourth semicircular ring are buckled into a circular ring, and one of the third semicircular ring and the fourth semicircular ring is located at a fixed seat, and during the rotation of the third monitoring ring, the third semicircular ring and the fourth semicircular ring alternately contact the fixed seat, and the third semicircular ring and the fourth semicircular ring are both provided with a monitoring unit 8, a monitoring ring motion monitoring module 9 and a monitoring ring speed monitoring module 10.

[0041] See also Figure 1 and Figure 2 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, the monitoring unit 8 of the first monitoring ring 2 preferably includes: multiple groups of first monitoring modules installed on the first semicircular ring 6, and multiple groups of second monitoring modules installed on the second semicircular ring 7, the multiple groups of first monitoring modules are distributed at 90° to 120° on the first semicircular ring 6, and the multiple groups of second monitoring modules are distributed at 90° to 120° on the second semicircular ring 7, and the multiple groups of first monitoring modules and the multiple groups of first monitoring modules are both connected to a processor; the monitoring unit 8 of the second monitoring ring 3 includes: multiple groups of third monitoring modules installed on the third semicircular ring, and multiple groups of fourth monitoring modules installed on the fourth semicircular ring, the multiple groups of third monitoring modules are distributed at 90° to 120° on the third semicircular ring, and the multiple groups of fourth monitoring modules are distributed at 90° to 120° on the fourth semicircular ring, and the multiple groups of third monitoring modules and the multiple groups of fourth monitoring modules are both connected to the processor.

[0042] See also Figure 1 and Figure 2 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, preferably, the first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module have the same structure; the first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module all include a plurality of eddy current sensors, and the resistance values ​​of the plurality of eddy current sensors are different. Each eddy current sensor is provided with a first resistor and a second resistor, and the resistance values ​​of the first resistor and the second resistor are different.

[0043] See also Figure 3In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, the diameters of the eddy current sensors are preferably different. The eddy current sensors include a maximum diameter eddy current sensor, a plurality of larger diameter eddy current sensors 11 arranged around the maximum diameter eddy current sensor, a plurality of medium diameter eddy current sensors 12 arranged around each larger diameter eddy current sensor 11, a plurality of smaller diameter eddy current sensors 13, and a plurality of minimum diameter eddy current sensors 14.

[0044] See also Figure 3 In a steam turbine rotor eccentricity monitoring device according to an embodiment of the present invention, it is preferred that the maximum value of the monitoring distance of each diameter of the eddy current sensor is different; and each diameter of the eddy current sensor is connected to the processor.

[0045] See also Figure 3 and Figure 4 In the eddy current sensors of the embodiment of the present invention, when rotating with the first semicircular ring 6, the second semicircular ring 7, the third semicircular ring, and the fourth semicircular ring, if the turbine shaft 1 rotates normally without eccentricity, each eddy current sensor transmits the same distance value to the processor. If the turbine shaft 1 rotates eccentrically, the eddy current sensor whose distance value transmitted to the processor decreases indicates that the turbine is deflecting in the direction of the eddy current sensor whose distance value transmitted to the processor increases indicates that the turbine is deflecting in the opposite direction of the eddy current sensor whose distance value increased. If the change in distance value of the eddy current sensor installed on the first monitoring ring 2 is less than the change in distance value of the eddy current sensor installed on the second monitoring ring 3, it indicates that the eccentricity of the turbine shaft 1 where the second monitoring ring 3 is located has affected the eccentricity of the turbine shaft 1 where the first monitoring ring 2 is located. The distance values ​​of the eddy current sensors on the same half ring mostly remain unchanged. If the distance values ​​of one or several eddy current sensors change slightly, it means that the first resistor or the second resistor of the eddy current sensor with the slight change needs to be replaced.

[0046] See also Figure 4 In the embodiment of the present invention, when the distance value of the eddy current sensor remains unchanged for a long time, the monitoring units 8 on the first semicircular ring 6 or the second semicircular ring 7 in the first monitoring ring 2 operate alternately, and the monitoring units 8 on the third semicircular ring or the fourth semicircular ring in the second monitoring ring 3 operate alternately, thereby saving power consumption and extending the service life of the steam turbine rotor eccentricity monitoring device. In the embodiment of the present invention, once the distance value of the eddy current sensor changes, the monitoring units 8 on the first semicircular ring 6 and the second semicircular ring 7 in the first monitoring ring 2, and the monitoring units 8 on the third semicircular ring and the fourth semicircular ring in the second monitoring ring 3 operate simultaneously to synchronously obtain the eccentricity status of the steam turbine rotor.

[0047] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A steam turbine rotor eccentricity monitoring device, characterized in that: include: A first monitoring ring installed at one end of the steam turbine shaft, a second monitoring ring installed at the other end of the steam turbine shaft, and a fixing base for fixing the first monitoring ring and the second monitoring ring; The first monitoring ring is arranged close to the main impeller of the steam turbine, and the second monitoring ring is arranged close to the largest impeller of the steam turbine. The first monitoring ring and the second monitoring ring are both arranged coaxially with the rotating shaft of the steam turbine; The first monitoring ring and the second monitoring ring are both equipped with monitoring units, each monitoring unit monitors the shortest distance from the monitoring point to the turbine shaft, and each monitoring unit is connected to a processor, which processes the shortest distance to obtain the eccentricity state of the turbine shaft. The first monitoring ring includes a first semicircular ring and a second semicircular ring, the first semicircular ring and the second semicircular ring are buckled into a circular ring, and one of the first semicircular ring and the second semicircular ring is located on the fixed seat. During the rotation of the first monitoring ring, the first semicircular ring and the second semicircular ring alternately contact the fixed seat, and the first semicircular ring and the second semicircular ring are both provided with a monitoring unit, a monitoring ring motion monitoring module, and a monitoring ring speed monitoring module; The second monitoring ring includes a third semicircular ring and a fourth semicircular ring, the third semicircular ring and the fourth semicircular ring are buckled into a ring, and one of the third semicircular ring and the fourth semicircular ring is located on the fixed seat. During the rotation of the second monitoring ring, the third semicircular ring and the fourth semicircular ring alternately contact the fixed seat, and the third semicircular ring and the fourth semicircular ring are both provided with a monitoring unit, a monitoring ring motion monitoring module and a monitoring ring speed monitoring module; The monitoring unit of the first monitoring ring includes: multiple groups of first monitoring modules installed on the first semicircle ring, and multiple groups of second monitoring modules installed on the second semicircle ring. The multiple groups of first monitoring modules are distributed in the first semicircle ring at 90°~120°, and the multiple groups of second monitoring modules are distributed in the second semicircle ring at 90°~120°. The multiple groups of first monitoring modules and the multiple groups of first monitoring modules are all connected to the processor.

2. The steam turbine rotor eccentricity monitoring device according to claim 1, characterized in that: The first monitoring ring and the second monitoring ring both rotate circumferentially around the axis of the steam turbine shaft; A driving rotation component is installed on the fixing seat, and the driving rotation component drives the first monitoring ring and the second monitoring ring to rotate.

3. The steam turbine rotor eccentricity monitoring device according to claim 1, characterized in that: A monitoring ring motion monitoring module is installed on each of the first monitoring ring and the second monitoring ring, and the monitoring ring motion monitoring module monitors the rotation state of the first monitoring ring or the second monitoring ring; The monitoring ring motion monitoring module is connected to the processor, and the processor determines the states of the first monitoring ring and the second monitoring ring according to the rotation states.

4. The steam turbine rotor eccentricity monitoring device according to claim 1, characterized in that: A monitoring ring speed monitoring module is installed on each of the first monitoring ring and the second monitoring ring, and the monitoring ring speed monitoring module monitors the rotation state of the first monitoring ring or the second monitoring ring; The monitoring ring speed monitoring module is connected to the processor, and the processor determines the movement speed and movement acceleration of the first monitoring ring and the second monitoring ring according to the rotation state.

5. The steam turbine rotor eccentricity monitoring device according to claim 1, characterized in that: The monitoring units of the second monitoring ring include: multiple groups of third monitoring modules installed on the third semicircle ring, and multiple groups of fourth monitoring modules installed on the fourth semicircle ring. The multiple groups of third monitoring modules are distributed at 90°~120° in the third semicircle ring, and the multiple groups of fourth monitoring modules are distributed at 90°~120° in the fourth semicircle ring. The multiple groups of third monitoring modules and the multiple groups of fourth monitoring modules are all connected to the processor.

6. The steam turbine rotor eccentricity monitoring device according to claim 5, characterized in that: The first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module have the same structure; The first monitoring module, the second monitoring module, the third monitoring module and the fourth monitoring module all include a plurality of eddy current sensors having different resistance values. Each eddy current sensor is provided with a first resistor and a second resistor having different resistance values.

7. The steam turbine rotor eccentricity monitoring device according to claim 6, characterized in that: The diameters of the several eddy current sensors are different. The several eddy current sensors include a maximum diameter eddy current sensor, a plurality of larger diameter eddy current sensors arranged around the maximum diameter eddy current sensor, a plurality of medium diameter eddy current sensors arranged around each larger diameter eddy current sensor, a plurality of smaller diameter eddy current sensors, and a plurality of minimum diameter eddy current sensors.

8. The steam turbine rotor eccentricity monitoring device according to claim 7, characterized in that: The maximum monitoring distance of each diameter of eddy current sensor is different; Each diameter of the eddy-current sensor is connected to a processor.

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