CN216012103U - Large-scale rotating equipment inclined plane differential expansion monitoring devices - Google Patents
Large-scale rotating equipment inclined plane differential expansion monitoring devices Download PDFInfo
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- CN216012103U CN216012103U CN202121536036.3U CN202121536036U CN216012103U CN 216012103 U CN216012103 U CN 216012103U CN 202121536036 U CN202121536036 U CN 202121536036U CN 216012103 U CN216012103 U CN 216012103U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 50
- 238000012545 processing Methods 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007572 expansion measurement Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The utility model relates to a large-scale rotating equipment inclined plane differential expansion monitoring device, which comprises a main monitoring eddy current sensor (1) and an auxiliary monitoring eddy current sensor (2); a main probe of the main monitoring eddy current sensor (1) is over against the inclined plane of the main shaft (101), and an auxiliary probe of the auxiliary monitoring eddy current sensor (2) is over against the horizontal axial plane of the main shaft (101); the sensing signals acquired by the main monitoring eddy current sensor (1) and the auxiliary monitoring eddy current sensor (2) are respectively led to the detection circuit and then input into the digital processing circuit. The utility model relates to a large-scale rotating equipment inclined plane differential expansion monitoring device which is used for displaying the processed differential expansion state on a liquid crystal screen of a display circuit and outputting signals to the outside. The bearing expansion difference monitoring device and method are simple in structure and convenient to use.
Description
Technical Field
The utility model relates to a device for monitoring the thermal expansion difference of an inclined plane of large-scale rotating equipment.
Background
At present, in the starting operation process of large-scale rotating equipment, for example, in the starting, stopping and normal operation processes of a steam turbine unit, the thermal expansion and contraction of a steam turbine main shaft and a steam cylinder are different due to different heat capacities of the steam turbine main shaft and the steam cylinder, and as a result, the steam turbine unit is subjected to dynamic and static friction and is damaged. Therefore, during the operation of the steam turbine, a steam turbine differential expansion monitoring protection instrument (TSI) must be installed to continuously monitor the steam turbine differential expansion parameter on line and ensure that the differential expansion parameter operates in a safe range.
Because the differential expansion parameter is very important, when the steam turbine is overhauled, the eddy current sensor and the differential expansion measurement loop required by differential expansion measurement are generally required to be checked, whether drift exists after the sensor and the measurement loop are detected to run for a period of time or not is detected, the measurement precision is influenced, and the sensor and the measurement loop are adjusted if necessary to ensure the accuracy and the reliability of the measurement loop.
Meanwhile, as the rotary machine becomes larger, the displacement amount required to be detected gradually increases. Due to the limitations of sensor technology development, various non-contact sensors have been unable to meet the requirements of a wide range of applications. In order to measure a larger measuring range by using a sensor with a smaller measuring range, a monitoring method and a monitoring device for measuring the expansion difference by using the sensor with the small measuring range, which are convenient and reliable to modify and use, are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and provide the large-scale rotating equipment inclined plane expansion difference monitoring device which is simple in structure and convenient to use
The purpose of the utility model is realized as follows:
a large-scale rotating equipment inclined plane differential expansion monitoring device comprises a main monitoring eddy current sensor and an auxiliary monitoring eddy current sensor; the main probe of the main monitoring eddy current sensor is over against the inclined plane of the main shaft, and the auxiliary probe of the auxiliary monitoring eddy current sensor is over against the horizontal shaft plane of the main shaft; and sensing signals acquired by the main monitoring eddy current sensor and the auxiliary monitoring eddy current sensor are respectively led to the detection circuit and then input into the digital processing circuit.
Furthermore, the detection circuit comprises a filter circuit, a signal processing circuit, a digital processing circuit and an analog output circuit which are connected in sequence; the sensing signals acquired by the main monitoring eddy current sensor and the auxiliary monitoring eddy current sensor are respectively transmitted to the digital processing circuit through the filter circuit and the signal processing circuit, and an analog output circuit relay output circuit is connected to an IO port of the digital processing circuit.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model aims at the situation that when the expansion difference measurement requirement range is larger, the requirement of the expansion difference measurement range of a single sensor cannot be met due to the limitation of the linear range of the measurement sensor and the measurement clearance range at the installation position, an eddy current sensor is respectively installed in the vertical direction of the inclined plane of the direct bearing and the main shaft, the measured surface of the main shaft is designed into an inclined plane, the inclined plane of the measurement disc is used for mechanical amplification, the requirement of the linear range of the measurement sensor and the measurement clearance range at the installation position is reduced, the requirement of the expansion difference monitoring protection instrument for the measurement range is larger, the device can also output a corresponding analog quantity 4-20 mA signal and a relay signal to a control center, and the expansion difference condition of the bearing can be directly monitored at the control center.
Drawings
Fig. 1 is a sensor mounting diagram of an inclined plane differential expansion monitoring device of the utility model.
Fig. 2 is a circuit block diagram of an apparatus for monitoring the differential expansion of an inclined plane according to the present invention.
Fig. 3 is a filtering and signal processing circuit of the slope differential expansion monitoring device of the present invention.
Fig. 4 is a relay control circuit of the slope differential expansion monitoring device of the present invention.
Fig. 5 is a current control output circuit of the slope differential expansion monitoring device of the present invention.
Wherein:
a main shaft 101;
a main monitoring eddy current sensor 1 and an auxiliary monitoring eddy current sensor 2.
Detailed Description
Referring to fig. 1-5, the utility model relates to a large-scale rotating equipment inclined plane differential expansion monitoring device, which comprises a main monitoring eddy current sensor 1 and an auxiliary monitoring eddy current sensor 2, wherein the main monitoring eddy current sensor 1 and the auxiliary monitoring eddy current sensor are positioned above a main shaft 101; the central line of a main probe of the main monitoring eddy current sensor 1 is vertical to the inclined plane of the main shaft 101 and is used for monitoring the bearing expansion difference; the center line of the auxiliary probe of the auxiliary monitoring eddy current sensor 2 is perpendicular to the horizontal axial plane of the main shaft 101, and the auxiliary probe is mainly used for eliminating error influence caused by vertical expansion of a bearing.
The sensing signals acquired by the main monitoring eddy current sensor 1 and the auxiliary monitoring eddy current sensor 2 are respectively led to a detection circuit and then input into a digital processing circuit MCU, and the detection circuit comprises a filter circuit, a signal processing circuit, a digital processing circuit and an analog quantity output circuit; the signals of the sensors enter the signal processing circuit after passing through the filter circuit in sequence, and after the signals are processed, the signals are transmitted to the digital processing circuit MCU for calculation display and control of current output and relay output. And the display circuit is used for displaying the processed expansion difference state on a liquid crystal screen of the display circuit and outputting signals to the outside. The analog quantity output circuit converts the differential expansion displacement into a standard 4-20 mA signal and provides the standard 4-20 mA signal for program control systems such as DCS, PLC and the like, so that a user can conveniently monitor the bearing differential expansion in a monitoring center, and the circuit converts the voltage signal output by the sensor into a standard 4-20 mA analog quantity signal by adopting an AM 462.
The utility model relates to a specific monitoring method of a large-scale rotating equipment inclined plane differential expansion monitoring device, which comprises the following steps: through installing two eddy current sensors in monitoring plane, main monitoring eddy current sensor 1 is used for monitoring the differential expansion amount D1 of bearing inclined plane, and vice monitoring eddy current sensor 2 is used for monitoring the differential expansion amount D2 of bearing vertical direction.
D=（D1-D2*cosα）/sinα；
Current output I = (16/D)MAX) D +4 mA; the system is used for remote monitoring;
in the formula:
d is a displayed value (bearing actual amount of expansion);
d1 represents the monitored differential expansion of the primary sensor;
d2 represents the monitored differential expansion of the secondary sensor;
α represents the angle of the slope;
DMAXindicating the range of the monitoring device;
i represents the current output of the monitoring device;
by utilizing the formula, the bearing expansion difference of a large range can be monitored by a sensor of a small range.
Meanwhile, in order to measure more accurately, calibration needs to be performed first;
firstly, zero calibration: after the two eddy current sensors are connected, the two eddy current sensors are respectively adjusted to the zero position, the theoretical display value D =0mm of the monitoring device, and the display values of the main monitoring eddy current sensor 1 and the auxiliary monitoring eddy current sensor 2 are adjusted to display 0 through a zero adjustment potentiometer;
secondly, full-scale calibration: the main monitoring eddy current sensor 1 is adjusted to the maximum measuring range, the auxiliary monitoring eddy current sensor 2 is adjusted to the zero position, and the expansion difference monitoring amount is the maximum value D = D1/sin alpha.
In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.
Claims (2)
1. The utility model provides a poor monitoring devices of large-scale rotating equipment inclined plane inflation which characterized in that: the device comprises a main monitoring eddy current sensor (1) and an auxiliary monitoring eddy current sensor (2); a main probe of the main monitoring eddy current sensor (1) is over against the inclined plane of the main shaft (101), and an auxiliary probe of the auxiliary monitoring eddy current sensor (2) is over against the horizontal axial plane of the main shaft (101); the sensing signals acquired by the main monitoring eddy current sensor (1) and the auxiliary monitoring eddy current sensor (2) are respectively led to the detection circuit and then input into the digital processing circuit.
2. The large scale rotating equipment slope differential expansion monitoring device according to claim 1, characterized in that: the detection circuit comprises a filter circuit, a signal processing circuit, a digital processing circuit and an analog output circuit which are connected in sequence; the sensing signals acquired by the main monitoring eddy current sensor (1) and the auxiliary monitoring eddy current sensor (2) are transmitted to the digital processing circuit through the filter circuit and the signal processing circuit respectively, and an analog output circuit relay output circuit is connected to an IO port of the digital processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121536036.3U CN216012103U (en) | 2021-07-07 | 2021-07-07 | Large-scale rotating equipment inclined plane differential expansion monitoring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121536036.3U CN216012103U (en) | 2021-07-07 | 2021-07-07 | Large-scale rotating equipment inclined plane differential expansion monitoring devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216012103U true CN216012103U (en) | 2022-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121536036.3U Active CN216012103U (en) | 2021-07-07 | 2021-07-07 | Large-scale rotating equipment inclined plane differential expansion monitoring devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216012103U (en) |
-
2021
- 2021-07-07 CN CN202121536036.3U patent/CN216012103U/en active Active
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