CN212054972U - Absolute encoder type water turbine guide vane opening degree measuring device - Google Patents
Absolute encoder type water turbine guide vane opening degree measuring device Download PDFInfo
- Publication number
- CN212054972U CN212054972U CN202020375627.6U CN202020375627U CN212054972U CN 212054972 U CN212054972 U CN 212054972U CN 202020375627 U CN202020375627 U CN 202020375627U CN 212054972 U CN212054972 U CN 212054972U
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- encoder
- absolute encoder
- guide vane
- opening degree
- absolute
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model relates to an absolute encoder formula hydraulic turbine stator aperture measuring device, including absolute encoder, absolute encoder lower surface rigid coupling has the encoder mount, and absolute encoder's projecting shaft passes the encoder mount to be connected with the one end of shaft coupling flange, and the other end of shaft coupling flange is connected with the encoder support, and the encoder support passes through the bolt rigid coupling on leading the leaf end cover. The utility model discloses simple structure, reasonable in design does not the counter, and measurement angle corresponds each position absolutely only and does not have accumulative error, anti-interference, DC supply and need not to fall electric memory, operation convenient to use, and measurement accuracy is high.
Description
Technical Field
The utility model belongs to the technical field of the stator aperture is measured, a absolute encoder formula hydraulic turbine stator aperture measuring device is related to.
Background
The existing measuring method for measuring the opening degree of the guide vane of the water turbine during the running of the unit of the hydraulic power plant is as follows: and obtaining the opening degree of the guide vane according to the stroke S of the guide vane servomotor measured by the displacement sensor and the corresponding relation between the stroke of the servomotor and the opening degree of the guide vane provided by a water turbine (water guide mechanism) manufacturer. The disadvantages of this method are: due to the existence of gaps among a plurality of transmission parts between the guide vane shaft and the servomotor push-pull rod, the change of the opening degree of the guide vane lags behind the change of the stroke of the servomotor, particularly, after the operation is carried out for a period of time, pin holes at the connection part of the big lug ring of the control ring and the servomotor push-pull rod, the connection part of the guide vane connecting plate and the connecting rod, and the connection part of the connecting rod and the small lug ring of the control ring are all deformed due to frequent abrasion, so that the phenomenon that the opening degree of the guide vane lags behind the stroke of the servomotor occurs, namely, the guide vane does not act at the initial stage of the action of the servomotor, a relation curve S of the stroke S of the guide vane servomotor and the opening degree of the guide vane is distorted (a.
In the unit maintenance, the opening degree of the guide vane needs to be measured, and the existing measuring method comprises the following steps: and (3) allowing a maintainer to penetrate the caliper into the gap between the two guide vanes, adjusting the opening angle of the caliper until the opening degree of the guide vanes is measured, taking out the caliper, and measuring the distance between measuring points of the caliper by using a steel plate ruler, namely the opening degree of the guide vanes. The problems with this approach are: the measurement and the reading can not be completed simultaneously, the measurement operation is complex, the efficiency is low, when the steel plate ruler for the caliper is taken out for measurement, human errors exist, the measurement efficiency is low, in addition, in the volute, the environment is dark, the sight problem of measurement personnel is increased, the measurement precision is low, the operation is complicated, the requirement on the operation personnel is high, and meanwhile, certain safety problems exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an absolute encoder formula hydraulic turbine stator aperture measuring device has solved the problem that the stator aperture lags behind the servomotor stroke according to looking into the servomotor stroke, easily appearing the stator aperture that exists among the prior art.
The utility model discloses the technical scheme who adopts is, an absolute encoder formula hydraulic turbine stator aperture measuring device, including absolute encoder, absolute encoder lower surface rigid coupling has the encoder mount, and absolute encoder's projecting shaft passes the encoder mount and is connected with the one end of shaft coupling flange, and the other end of shaft coupling flange is connected with the encoder support, and the encoder support passes through the bolt rigid coupling on leading the leaf end cover.
The extending shaft of the absolute encoder is connected with the extending end of the coupling flange through a flat key.
The absolute encoder is connected with a special display and signal conversion instrument through a lead.
Absolute encoder is connected to encoder mount one end, and the encoder mount other end is fixed on the top cap.
The encoder bracket is shaped like a Chinese character ji.
The beneficial effects of the utility model are that, simple structure, reasonable in design, the counter is not counted, and measurement angle corresponds each position absolutely only and does not have accumulative error, anti-interference, DC supply and need not to fall electric memory, operation convenient to use, and measurement accuracy is high. Parameters can be set on the special instrument for SSI signal output, a special program is used for code reading decoding, fault tolerance and internal calculation, the workload is reduced quickly and accurately, the stability and the reliability are improved, the opening degree of the guide vane can be displayed visually on site, various PLCs or upper computers can be connected behind the special instrument, and the universality is high.
Drawings
Fig. 1 is a partial schematic view of a device for measuring the opening degree of a guide vane of an absolute encoder type water turbine according to the present invention;
fig. 2 is a schematic structural diagram of the device for measuring the opening degree of the guide vane of the absolute encoder type water turbine of the present invention;
fig. 3 is a schematic diagram of the opening degree and the rotation angle of the guide vane of the present invention;
FIG. 4 shows the guide vane rotation angle α and the guide vane opening a of the present invention0Graph of the relationship of (c).
In the figure, 1 is an absolute encoder, 2 is an encoder fixing frame, 3 is an encoder bracket, 4 is a flat key, and 5 is a coupling flange.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides an absolute encoder formula hydraulic turbine stator aperture measuring device, as shown in figure 1, figure 2, including absolute encoder 1, the 1 lower surface rigid coupling of absolute encoder has encoder mount 2, and absolute encoder 1's extension shaft passes encoder mount 2 and is connected with the one end of coupling flange 5, and the other end of coupling flange 5 is connected with encoder support 3, and encoder support 3 passes through the bolt rigid coupling on leading the leaf end cover.
An extension shaft of the absolute encoder 1 is connected with an extension end of a coupling flange 5 through a flat key 4, and the torque of a guide vane shaft is transmitted to the extension shaft of the absolute encoder through the flat key.
The absolute encoder 1 is connected with a special display and signal conversion instrument through a lead.
The encoder bracket 3 is shaped like a Chinese character ji.
The working principle of the utility model is that,
the utility model discloses a photoelectric single circle absolute encoder is used for the angular surveying within 360 degrees of rotation range, is the sensor of a direct output digital quantity, there are a plurality of concentric code channels along radial on its circular code wheel, every is alternately constituteed by printing opacity and lightproof sector, the sector number of adjacent code channel is double relation, the code channel number on the code wheel is the digit of its binary number, one side at the code wheel is the light source, the opposite side corresponds each code channel and has a photosensitive element, when the code wheel is in different positions, each photosensitive element changes corresponding level signal according to whether receiving illumination, form the binary number, can read out a fixed digital code corresponding with the position in the optional position of pivot; the more code channels, the higher the resolution, therefore, the photoelectric single-turn absolute encoder does not need a counter, can directly read the absolute value of the angle coordinate, and can accurately measure the guide vane rotation angle.
Fig. 3 shows a group of guide vanes at different positions, wherein position 1 shows the fully closed position of the guide vanes, the diameter of the opening circle is 0, and the rotation angle of the guide vanes is 0 degree;
the position 2 represents that the guide vane rotates to the optimal position of the guide vane opening from the fully closed position, the diameter of the opening circle is 213.8mm, and the rotation angle of the guide vane is 27 degrees;
and the position 3 represents the maximum possible opening position of the guide vane, the diameter of an opening circle is 293.3mm, and the rotation angle of the guide vane is 39 degrees.
FIG. 4 shows the guide vane rotation angle α and the guide vane opening a of the HL180-LJ-345 model water turbine in this embodiment0Graph of the relationship of (c). When the device is applied to practice, the relation curve can be provided by a water turbine (water distributor) manufacturer, and the relation curve is close to linearity, so that a fitted approximate straight line is generally adopted for replacing the relation curve.
The special display and signal conversion instrument is a multifunctional instrument, the instrument adopts microcomputer control technology, an absolute encoder measures output signals and inputs the output signals to the special display and signal conversion instrument, the input signals are internally decoded and calculated by a CPU in the instrument according to corresponding programs, and guide vane rotating angle alpha and guide vane opening degree a corresponding to the HL180-LJ-345 type water turbine in figure 4 are calculated0The relationship curve is subjected to interpolation calculation, the opening value of the guide vane is displayed, and then the signal is converted into a signal of an input model required by the upper computer. And finally, the machine position on the central control room receives the signal and displays the opening value.
When the utility model is used, the utility model,
after the device is installed, the guide vane position is given, the rotation position of the main shaft of the photoelectric single-ring absolute encoder connected with the coupling flange through a flat key is given, when the guide vane rotates, the encoder bracket fixed on the end cover is driven to rotate, so that the shaft of the absolute encoder connected with the coupling flange through the flat key concentrically and synchronously rotates, the absolute encoder reads out an angle coordinate, an output signal of the angle coordinate is transmitted to a special display and signal conversion instrument, the special display and signal conversion instrument performs internal decoding, calculation, display and signal conversion, the signal is converted into a signal of an input model required by a machine-loading position, and the machine-loading position of a central control room receives the signal and displays an opening value guide vane rotating angle and a guide vane opening value.
The utility model discloses use the absolute encoder of photoelectricity single loop, avoided lagging behind the problem of servomotor stroke because of the stator aperture that appears in the existence in the clearance between stator drive mechanism, the stator aperture of surveying does not have accumulative error, and positional information can not lose after the power excision, and the precision of encoder depends on the digit. Meanwhile, the device is convenient to use, simple in structure, reasonable in design, absolutely unique in each position corresponding to the absolute encoder measuring angle, anti-interference, free of power-down memory, convenient to operate and use and high in measuring precision. In addition, when the unit overhauls, also can use this device to measure the stator opening, need not to get into in the spiral case, avoided reducing artificial safety factor because of the personal error that environmental factor leads to, improved measurement of efficiency, safe and reliable.
Claims (5)
1. The utility model provides an absolute encoder formula hydraulic turbine stator aperture measuring device, its characterized in that, includes absolute encoder (1), absolute encoder (1) lower surface rigid coupling has encoder mount (2), the one end that the projecting shaft of absolute encoder (1) passed encoder mount (2) and shaft coupling flange (5) is connected, shaft coupling flange (5) other end is connected with encoder support (3), encoder support (3) are through the bolt rigid coupling on leading the leaf end cover.
2. The absolute encoder type water turbine guide vane opening degree measuring device is characterized in that an extending shaft of the absolute encoder (1) is connected with an extending end of a coupling flange (5) through a flat key (4).
3. The absolute encoder type water turbine guide vane opening degree measuring device according to claim 1, characterized in that the absolute encoder (1) is connected with a special display and signal conversion instrument through a lead.
4. The device for measuring the opening degree of the guide vane of the absolute encoder type water turbine as claimed in claim 1, wherein one end of the encoder fixing frame (2) is connected with the absolute encoder (1), and the other end of the encoder fixing frame (2) is fixed on the top cover.
5. The absolute encoder type water turbine guide vane opening degree measuring device according to claim 1, characterized in that the encoder bracket (3) is in a shape of a Chinese character ji.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020375627.6U CN212054972U (en) | 2020-03-23 | 2020-03-23 | Absolute encoder type water turbine guide vane opening degree measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020375627.6U CN212054972U (en) | 2020-03-23 | 2020-03-23 | Absolute encoder type water turbine guide vane opening degree measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212054972U true CN212054972U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020375627.6U Expired - Fee Related CN212054972U (en) | 2020-03-23 | 2020-03-23 | Absolute encoder type water turbine guide vane opening degree measuring device |
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| CN (1) | CN212054972U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117685871A (en) * | 2024-02-04 | 2024-03-12 | 东方电气集团东方电机有限公司 | Guide vane opening monitoring method, monitoring device and computer readable storage medium |
-
2020
- 2020-03-23 CN CN202020375627.6U patent/CN212054972U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117685871A (en) * | 2024-02-04 | 2024-03-12 | 东方电气集团东方电机有限公司 | Guide vane opening monitoring method, monitoring device and computer readable storage medium |
| CN117685871B (en) * | 2024-02-04 | 2024-04-16 | 东方电气集团东方电机有限公司 | Guide vane opening monitoring method, monitoring device and computer readable storage medium |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |