CN214041445U - Device for measuring rotating speed and phase of small steam turbine and steam turbine - Google Patents
Device for measuring rotating speed and phase of small steam turbine and steam turbine Download PDFInfo
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- CN214041445U CN214041445U CN202022648623.3U CN202022648623U CN214041445U CN 214041445 U CN214041445 U CN 214041445U CN 202022648623 U CN202022648623 U CN 202022648623U CN 214041445 U CN214041445 U CN 214041445U
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Abstract
The utility model provides a device and steam turbine for measuring small-size steam turbine rotational speed and phase place, including encoder magnetic drum, a plurality of mounting platform and a plurality of magnetic sensor, set up a plurality of first mounting holes on the encoder magnetic drum, the encoder magnetic drum is located the spindle nose of steam turbine rotor through first mounting hole; each mounting platform is provided with a third mounting hole and is arranged on the inner wall of the steam turbine cylinder body; each magnetic sensor is arranged on a third mounting hole of the mounting platform, a mounting distance D is arranged between each magnetic sensor and the encoder magnetic drum, each magnetic sensor is connected with the server end through a transmission line, the measuring structure is high in measuring accuracy, high in reliability and stability, capable of monitoring the rotating speed and the phase position simultaneously, small in occupied space and not limited by the size of a measuring target surface for a small-sized steam turbine.
Description
Technical Field
The utility model belongs to the precision machinery measures the field, concretely relates to a device and steam turbine for measuring small-size steam turbine rotational speed and phase place.
Background
The turbine is a precision machine rotating at high speed, the measurement of the rotating speed of the turbine is an important problem in the fields of scientific experiments and industry, the rotating speed of the turbine is constantly changed in the starting and stopping processes, and particularly, overspeed can be caused when the turbine is subjected to accident load shedding, so that continuous monitoring and control are required; in the starting and stopping processes of the steam turbine, the critical rotating speed is usually required to be passed, the vibration trend in the starting or stopping process can be perfectly captured by using a phase matching shaft vibration sensor, the real-time axis position of a rotor is obtained, and the bearing disturbance or vortex is analyzed; measuring the phase, giving out the relative relation of vibration of each measuring point, giving out the relation with the key phase groove when performing dynamic balance, determining the position of the counterweight and the like.
At present, the current adopts an eddy current sensor and a reluctance type sensor to measure the rotating speed and the phase of a steam turbine, and the measuring mode has the advantages that on one hand, the eddy current sensor and the reluctance type key phase probe are adopted, so that the occupied space is large, the monitoring target surface required by the probe is relatively large, the area of a measured body is usually more than three times of the diameter of the probe, and the installation and the monitoring are difficult to realize for a small steam turbine with compact structure and small shaft diameter; on the other hand, the eddy current sensor has strong sensitivity to the material of the measured object, and when the material of the measured object is different and the material of the measured surface is not uniform, the sensitivity and the linear range of the eddy current sensor are changed, and the sensitivity and the linear range of the eddy current sensor need to be corrected again, which brings deviation to the measurement result, and causes larger measurement error.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a device and a steam turbine for measuring the rotating speed and the phase of a small steam turbine, which solves the problems that in the prior art, on one hand, the occupied space is large, the monitoring target surface required by a probe is relatively large by adopting an eddy current sensor and a magnetic resistance type key phase probe, the area of the measured body is usually more than three times of the diameter of the probe, and the installation and the monitoring are difficult to realize for the small steam turbine with compact structure and small shaft diameter; on the other hand, the eddy current sensor has strong sensitivity to the material of the measured object, and when the material of the measured object is different and the material of the measured surface is not uniform, the sensitivity and the linear range of the eddy current sensor are changed, and the sensitivity and the linear range of the eddy current sensor need to be corrected again, so that the measurement result is deviated, and the measurement error is large.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a device for measuring the rotating speed and the phase of a small-sized steam turbine comprises an encoder magnetic drum, a plurality of mounting platforms and a plurality of magnetic sensors, wherein the encoder magnetic drum is provided with a plurality of first mounting holes and is arranged on a shaft head of a steam turbine rotor through the first mounting holes; each mounting platform is provided with a third mounting hole and is arranged on the inner wall of the steam turbine cylinder body; each magnetic sensor is arranged on a third mounting hole of the mounting platform, a mounting distance D is arranged between each magnetic sensor and the encoder magnetic drum, the mounting distance D is a gap between the encoder magnetic drum and the magnetic sensors along the diameter direction of the encoder magnetic drum, and each magnetic sensor is connected with the server end through a transmission line.
Optionally, each mounting platform is arranged on the outer circumferential surface of the steam turbine cylinder body close to the vertical direction.
Optionally, the mounting distance D is determined by measuring a gap distance between each magnetic sensor and the encoder drum by a feeler gauge, and a value range of the gap distance is 0.15 ± 0.01 mm.
Optionally, the magnetic sensor is a speed key integrated sensor.
Optionally, the number of the magnetic sensors is 3.
Optionally, the encoder drum is arranged coaxially with a center line of the turbine rotor.
A steam turbine comprises the device for measuring the rotating speed and the phase of the small steam turbine.
Compared with the prior art, the utility model, following technological effect has:
(I) the utility model discloses a device for measuring small-size steam turbine rotational speed and phase place, through set up the encoder magnetic drum on small-size steam turbine rotor spindle nose, and set up a plurality of mounting platforms on the steam turbine cylinder body simultaneously, install the magnetic sensor on each mounting platform respectively, each magnetic sensor passes through the electric wire connection server end respectively, through the coaxial setting of encoder magnetic drum and steam turbine, through the rotatory space magnetic leakage field that produces periodic distribution of encoder magnetic drum, the magnetic sensor passes through the magneto-resistance effect and converts the magnetic field signal that changes into the change of resistance value, under the effect of applied potential, the change resistance value converts the change into the change of voltage, through the decoding processing in the magnetic sensor, the analog voltage signal converts the digital signal that the computer can discern into, export to the server end through the electric wire, realize the coding function of magnetic rotary encoder, and then the rotational speed and the phase place of surveying small-size steam turbine, this kind of measurement structure measurement accuracy is high, stronger reliability and stability, can monitor rotational speed and phase place simultaneously, and occupation space is few, to small-size steam turbine, does not receive the restriction of measurement target surface size.
(II) the utility model discloses a device for measuring small-size steam turbine rotational speed and phase place, locate the steam turbine cylinder body through each mounting platform that will place magnetic sensor on being close to the outer peripheral face of vertical direction, for mounting platform provides reliable and stable support, further for magnetic sensor's installation provides stable environment, can prevent effectively that it is not hard up to the influence that brings the measuring result under the high-speed pivoted operating condition of steam turbine rotor.
(III) the utility model discloses a device for measuring small-size steam turbine rotational speed and phase place is 0.15 0.01mm through setting up the installation clearance distance between each magnetic sensor and the encoder magnetic drum, and under this installation condition, magnetic sensor can receive the magnetic field signal that stronger encoder magnetic drum produced, and the steam turbine rotational speed and the phase place precision that measure are high.
(IV) the utility model discloses a device for measuring small-size steam turbine rotational speed and phase place adopts rotational speed key looks integral type sensor.
Drawings
FIG. 1 is a schematic view of the installation structure of the apparatus of the present invention with a steam turbine;
FIG. 2 is a schematic view of a partial structure of an encoder drum and a magnetic sensor according to the present invention;
FIG. 3 is a schematic view of the working principle of the present invention;
fig. 4 is a schematic left-view installation distance diagram of the encoder drum and the magnetic sensor according to the present invention.
The meaning of the individual reference symbols in the figures is:
1-encoder magnetic drum, 2-first mounting hole, 3-turbine rotor, 4-mounting platform, 5-third mounting hole, 6-magnetic sensor and 7-turbine cylinder body.
The following examples are provided to explain the present invention in further detail.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example 1:
a device for measuring the rotating speed and the phase of a small-sized steam turbine comprises an encoder magnetic drum 1, a plurality of mounting platforms 4 and a plurality of magnetic sensors 6, wherein a plurality of first mounting holes 2 are formed in the encoder magnetic drum 1, and the encoder magnetic drum 1 is arranged on a shaft head of a steam turbine rotor 3 through the first mounting holes 2; each mounting platform 4 is provided with a third mounting hole 5, and the mounting platform 4 is arranged on the inner wall of a steam turbine cylinder body 7; each magnetic sensor 6 is arranged on a third mounting hole of the mounting platform, a mounting distance D is arranged between each magnetic sensor 6 and the encoder drum 1, the mounting distance D is a gap between the encoder drum 1 and the magnetic sensors 6 which are collinear along the diameter extension lines of the encoder drum, and each magnetic sensor 6 is connected with the server end through a transmission line.
The device for measuring the rotating speed and the phase of the small-sized steam turbine of the embodiment is characterized in that an encoder magnetic drum is arranged on a small-sized steam turbine rotor shaft head, a plurality of mounting platforms are arranged on a steam turbine cylinder body at the same time, magnetic sensors are respectively mounted on the mounting platforms and are respectively connected with a server end through wires, through the coaxial arrangement of the encoder magnetic drum and the steam turbine, a space magnetic leakage field which is periodically distributed is generated through the rotation of the encoder magnetic drum, the magnetic sensors convert changing magnetic field signals into changes of resistance values through a magneto-resistance effect, the changing resistance values are converted into changes of voltage under the action of external potential, analog voltage signals are converted into digital signals which can be identified by a computer through the processing of an internal circuit of the magnetic sensors, the digital signals are output to the server end through wires, and the encoding function of a magnetic rotary encoder is realized, and then the rotational speed and the phase place of surveying small-size steam turbine, this kind of measurement structure measurement accuracy is high, stronger reliability and stability, can monitor rotational speed and phase place simultaneously, and occupation space is few, to small-size steam turbine, does not receive the restriction of measurement target surface size.
First mounting hole and third mounting hole in this embodiment are the screw hole, and it is fixed through bolted connection, make things convenient for the dismouting, the installation is stable, and the model of the encoder magnetic drum of this embodiment is: the MU25604N15A model number of the magnetic sensor is TS5291N501, and the model number of the selected server is Siemens S7-1200 series PLC for processing digital signals.
As a preferable mode of the present embodiment, each of the mounting platforms 4 is provided on the outer peripheral surface of the turbine cylinder block 7 in the vertical direction.
The device for measuring the rotating speed and the phase of the small-sized steam turbine of the embodiment is characterized in that each mounting platform for placing the magnetic sensor is arranged on the outer peripheral surface of the steam turbine cylinder body close to the vertical direction, so that stable and reliable support is provided for the mounting platforms, and the influence on the measuring result caused by looseness under the working condition of high-speed rotation of the steam turbine rotor can be effectively prevented.
The ZG250 is selected as the material adopted by the mounting platform, so that stable and reliable support is provided for the mounting of the magnetic sensor.
As a preferable mode of the present embodiment, the installation distance D is obtained by measuring the distance between each magnetic sensor 6 and the encoder drum 1 by a feeler gauge, the distance is obtained in a range of 0.15 ± 0.01mm, and the measured turbine rotation speed and phase accuracy are high in order to ensure that the magnetic sensors can receive strong magnetic field signals generated by the encoder drum.
Specifically, the installation distance D is as shown in fig. 4, and the installation distance is selected to be 0.15mm in the present embodiment.
As a preferable mode of the present embodiment, the magnetic sensor 6 is a rotational speed and key phase integrated sensor.
The rotating speed and key phase integrated sensor can monitor the rotating speed and key phase of the steam turbine rotor at the same time, and the rotating speed and key phase integrated sensor is decoded and then transmitted to a server through a transmission cable.
As a preferable solution of this embodiment, the number of the magnetic sensors 6 is 3.
Through comprehensive analysis of data measured by the 3 magnetic sensors, the rotating speed and the phase of the steam turbine can be accurately measured.
As a preferable mode of the present embodiment, the encoder drum 1 is provided coaxially with the center line of the turbine rotor 3, and the measurement accuracy is improved in order to match the rotational speed of the turbine rotor with the encoder drum height.
The working principle of the embodiment is as follows:
as shown in fig. 4, the measurement principle of the rotation speed is M method:
the M method is to measure the speed at a certain time TcPulse number M output by internal measuring magnetic sensorcFor calculating the average rotational speed over this period of time. Handle McDivided by TcThe frequency f of the output pulse of the magnetic sensor can be obtainedc＝Mc/Tc. N is assumed to be the fixed pulse number generated by the incremental encoder in each rotation, because the encoder magnetic drum is coaxial with the steam turbine, N pulses are also generated in each rotation of the steam turbine, and f is setcThe speed of the turbine is obtained by dividing by N.
The unit of n is r/min.
Principle of measuring phase:
the corresponding period of each circle of the turbine rotor is T1, and similarly, 1Z pulse signal and N fixed A (or B) pulse sequences are output by each circle of the encoder drum, and the corresponding period is T2. When the server receives the rising edge of the Z pulse signal of the encoder drum output by the magnetic sensor, the phase signal is controlled to be set to 1. Meanwhile, the server counts the pulses of the A or B signals, and when the pulses count to N/2, the phase signal is set to 0. When the server receives the rising edge of the next Z signal output by the magnetic sensor, the phase reference signal is set to 1 again. Since the encoder drum and the main shaft of the steam turbine are fixed together, the period of the encoder drum and the main shaft of the steam turbine are consistent with the rotating speed, and therefore the period of the phase signal is also T1.
Example 2:
a steam turbine comprising the apparatus for measuring the speed and phase of a small steam turbine of embodiment 1.
Claims (7)
1. An apparatus for measuring the speed and phase of a small steam turbine, comprising:
the device comprises an encoder magnetic drum (1), wherein a plurality of first mounting holes (2) are formed in the encoder magnetic drum (1), and the encoder magnetic drum (1) is arranged on a shaft head of a steam turbine rotor (3) through the first mounting holes (2);
the mounting device comprises a plurality of mounting platforms (4), wherein each mounting platform (4) is provided with a third mounting hole (5), and each mounting platform (4) is arranged on the inner wall of a steam turbine cylinder body (7);
a plurality of magnetic sensor (6), each magnetic sensor (6) are located on mounting platform's the third mounting hole, each all be equipped with installation distance D between magnetic sensor (6) and encoder drum (1), installation distance D is the clearance between encoder drum (1) and the magnetic sensor (6) along its diameter extension collinear, and each magnetic sensor (6) pass through transmission line (8) and connect the server end.
2. The apparatus for measuring the rotational speed and phase of a small steam turbine according to claim 1, wherein each of the mounting platforms (4) is provided on the outer peripheral surface of the turbine block (7) in the vertical direction.
3. The apparatus for measuring rotational speed and phase of a small steam turbine according to claim 1, wherein the installation distance D is in a range of 0.15 ± 0.01 mm.
4. The apparatus for measuring the rotational speed and phase of a small steam turbine according to claim 1, wherein the magnetic sensor (6) is a rotational speed key integrated sensor.
5. The apparatus for measuring the rotational speed and phase of a small steam turbine according to claim 1, wherein the magnetic sensors (6) are provided in a number of 3.
6. The apparatus for measuring the rotational speed and phase of a small steam turbine according to claim 1, wherein the encoder drum (1) is disposed coaxially with the center line of the turbine rotor (3).
7. A steam turbine comprising an apparatus for measuring the speed and phase of a small steam turbine according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022648623.3U CN214041445U (en) | 2020-11-16 | 2020-11-16 | Device for measuring rotating speed and phase of small steam turbine and steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022648623.3U CN214041445U (en) | 2020-11-16 | 2020-11-16 | Device for measuring rotating speed and phase of small steam turbine and steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214041445U true CN214041445U (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022648623.3U Active CN214041445U (en) | 2020-11-16 | 2020-11-16 | Device for measuring rotating speed and phase of small steam turbine and steam turbine |
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| Country | Link |
|---|---|
| CN (1) | CN214041445U (en) |
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- 2020-11-16 CN CN202022648623.3U patent/CN214041445U/en active Active
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