JP3426831B2 - Verification device for rotation signal detector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing a rotation signal detector for measuring vibrations of rotors such as various turbines, pumps and fans in a non-contact manner. 2. Description of the Related Art FIG. 5 is a block diagram showing a configuration of a conventional apparatus for testing a rotation signal detector. As described above, the rotation signal detector is a device that generally measures the vibrations of the rotating blades of various turbines, pumps, fans, and the like in a non-contact manner. A number of electromagnetic rotation signal detectors having advantages such as simple and small structure, no power supply, and no maintenance are used. The electromagnetic rotation signal detector 1 shown in FIG.
The yoke 16, the permanent magnet 17, and the detection coil 18 output a rotation signal from the detection coil 18 to the outside via a signal line 19. The test of the rotation signal is performed by a method of inputting the rotation signal to the resistance meter 20 via the signal line 19 and measuring the resistance value. [0004] The conventional electromagnetic rotation signal detector as described above usually measures coil resistance as maintenance after a non-contact blade vibration measurement test, and the resistance is measured by the manufacturer. Check that the resistance is within the specified resistance range. However, since the rotation signal detector is generally used in a bad environment due to factors such as temperature and oil, the above-described yoke 16, permanent magnet 17, and detection coil 18 deteriorate over time, and data reliability decreases. It is a concern. [0005] During operation of the turbine, the rotor shaft of the rotor blades thermally expands as the temperature rises, and contracts due to the rotational centrifugal force. The amount of expansion and contraction is several millimeters, and the gap (interval) between the rotor and the rotation signal detector changes. If these rotor blades and the rotation signal detector are too close, they may come into contact with each other, and if they are too far apart, the reliability of the detection signal will decrease, and the reliability of the rotation signal detector will not be obtained only by managing the coil resistance. There is a problem. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for testing a rotation signal detector which can solve the problems caused by the interval between the rotor and the rotation signal detector and improve the reliability of blade vibration measurement data. Is to do. [0007] In order to solve the above-mentioned problems and to achieve the object, a verification apparatus for a rotation signal detector according to the present invention is configured as follows. The verification device of the rotation signal detector of the present invention is a verification device of a rotation signal detector that performs verification of a rotation signal output from a predetermined rotation signal detector,
A driving unit for driving a predetermined gear, a rotation signal detector installed opposite to the gear and having a function of adjusting an interval formed with the gear, and a peripheral speed of the gear based on the number of rotations of the driving unit. Based on the peripheral speed calculated by the first calculating unit and the output voltage of the rotation signal detector, based on the rotation speed of the rotation signal detector per unit circumferential speed of the gear. It comprises a second calculating means for calculating the output voltage, and an output means for outputting the result of the calculation of the second calculating means. [0008] As a result of taking the above measures, the following effects occur. According to the rotation signal detector testing device of the present invention,
The rotation signal detector has a function of adjusting an interval formed with the gear, and based on a peripheral speed of the gear and an output voltage of the rotation signal detector, which are calculated based on a rotation speed of the driving unit, Since the output voltage of the rotation signal detector per unit circumferential speed of the gear is calculated and output, the output characteristics of the rotation signal detector during actual turbine operation can be grasped, and the rotation blade and the rotation signal detection The distance between the vessel and the vessel can be determined appropriately. Accordingly, there is a danger of damage to the rotor and the rotation signal detector due to contact between the rotor and the rotation signal detector, and data resulting from a decrease in sensitivity of the rotation signal detector due to too much distance. It is possible to eliminate inconveniences such as a decrease in the reliability of the blade, and to improve the reliability of the blade vibration measurement data. FIG. 1 is a block diagram showing a configuration of a test apparatus for a rotation signal detector according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an electromagnetic rotation signal detector. The rotation signal detector 1 is the same as that shown in FIG. The rotation signal detector 1 is connected to a micrometer 2 via a micrometer mounting jig (not shown) (not shown).
Mounted on The rotation signal detector 1, the micrometer mounting jig, and the micrometer 2 constitute a gap adjusting jig. The micrometer 2 is connected to a waveform output device 6 via a rectifier 4 and a transfer characteristic calculator 5. An external speed controller 7 is connected to a motor 9 via a motor driving driver 8.
A gear 10 is attached to a drive shaft 91 of the motor 9. Further, the external speed controller 7 has a peripheral speed calculator 11
And connected to the transfer characteristic calculator 5 via
It is directly connected to the waveform output device 6. FIG. 2 is a side view showing the configuration of the gap adjusting jig. As shown in FIG. 2, the rotation signal detector 1
Is attached to the micrometer 2 via a micrometer attachment jig 3. The gap between the gear 10 shown in FIG. 1 and the electromagnetic rotation signal detector 1 is indicated by an arrow a using the micrometer 2 attached to the micrometer mounting jig 3. It is adjusted by moving in the direction. In the test apparatus according to the present embodiment, the gear 10 installed relative to the rotation signal detector 1 constituting the gap adjusting jig is driven by the external speed controller 7 instructing the number of rotations. The driver 8 is controlled to rotate by driving the motor 9. Then, the rotation signal output from the rotation signal detector 1 is rectified by the rectifier 4. On the other hand, the rotation speed indicated by the external speed controller 7 is input to the peripheral speed calculator 11, and the peripheral speed calculator 11 calculates the peripheral speed of the gear 10 based on the rotation speed. The output signal from the rectifier 4 and the output signal from the peripheral speed calculator 11 are input to the transfer characteristic calculator 5. After that, each output signal from the external speed controller 7 and the transfer characteristic calculator 5 is input to the waveform output device 6. FIGS. 3A and 3B are diagrams for comparing the gap adjustment between the blade vibration measurement of the actual turbine and the blade vibration measurement. FIG. 3A is a diagram related to the blade vibration measurement of the actual turbine, and shows the rotation signal detector 1 and the rotor blade 1.
FIG. 6 is a diagram showing gap adjustment with the second embodiment. FIG. 3B is a diagram related to the time of verification, and is a diagram illustrating a gap adjustment between the rotation signal detector 1 and the gear 10 of the verification device according to the present embodiment. Hereinafter, the operation of the test apparatus for the rotation signal detector according to the present embodiment will be described with reference to FIG. During the operation of the turbine, the rotor shaft (not shown) of the rotor blade 12 expands due to thermal expansion as the temperature rises, and contracts due to the rotational centrifugal force. that time,
As described above, if the gap between the rotary wing 12 and the rotation signal detector 1 is too close, they may come into contact with each other, which is dangerous. If the distance is too large, the reliability of the detection signal in the rotation signal detector 1 is reduced. Therefore, in consideration of the amount of expansion and contraction, a gap Δt1 between the rotation signal detector 1 and the rotary blade 12 is determined as shown in FIG. 3A, which is shown in FIG. 3B. As described above, it is necessary to make the gap Δt2 between the rotation signal detector 1 and the gear 10 the same at the time of the verification (that is, Δt1 = Δt2). This adjustment is performed by the adjuster with a micrometer (gap adjusting jig) shown in FIG. If the gap is different, the output voltage from the rotation signal detector 1 also changes. In the rotation signal detector 1, when the magnetic material approaches, the magnetic flux passing through the detection coil 18 around the yoke 16 shown in FIG. 5 changes, and an induced voltage having a frequency proportional to the change is generated in the detection coil 18. . Therefore, it is preferable that the number of blades of the rotary blade 12 and the number of teeth of the gear 10 are the same. The output voltage from the rotation signal detector 1 when the gear 10 rotates is full-wave rectified by the rectifier 4 shown in FIG. 1 and converted into a DC voltage, and then input to the transfer characteristic calculator 5. At the same time, the rotation cycle signal of the motor 9 is input from the external speed controller 7 to the peripheral speed calculator 11, and a signal indicating the peripheral speed, which is the calculation result of the peripheral speed calculator 11, is input to the transfer characteristic calculator 5. In the transfer characteristic calculator 5,
The output voltage from the detector 1 per unit peripheral speed is calculated, and the result is output to the waveform output device 6. The waveform output device 6 receives a rotation cycle signal from the external speed controller 7 and an output voltage per unit peripheral speed from the transfer characteristic calculator 5. FIG. 4 is a plot diagram showing data output from the waveform output device 6. In FIG. 4, the horizontal axis is the motor 9
The data is plotted with the rotation speed (RPM) of the gear (ie, the gear 10) and the output voltage (Volt / m / s) per unit circumferential speed on the vertical axis. It should be noted that the present invention is not limited to only the above-described embodiment, and can be implemented with appropriate modifications without departing from the scope of the invention. (Summary of Embodiment) The configuration, operation and effect shown in the embodiment are summarized as follows. The testing device of the rotation signal detector described in the embodiment is a testing device of a rotation signal detector that tests a rotation signal output from a predetermined rotation signal detector 1, and drives a predetermined gear 10. Driving means (8, 9) and a function (2, 3) installed opposite to the gear 10 to adjust the interval formed with the gear 10
A rotation signal detector 1 having the following, and the driving means (8, 9):
First calculating means (11) for calculating the peripheral speed of the gear 10 based on the number of rotations, and the peripheral speed calculated by the first calculating means (11) and the output voltage of the rotation signal detector 1. A second calculating means (5) for calculating an output voltage of the rotation signal detector 1 per unit circumferential speed of the gear 10 on the basis of the above, and outputting a calculation result of the second calculating means (5). And output means (6). As described above, in the above-described test apparatus for the rotation signal detector, the rotation signal detector 1 has a function (2, 3) for adjusting the interval between the gear 10 and the driving means (8, 9). The output voltage of the rotation signal detector 1 per unit circumferential speed of the gear 10 is calculated based on the peripheral speed of the gear 10 calculated based on the number of rotations and the output voltage of the rotation signal detector 1. Since the calculation and the output are performed, the output characteristics of the rotation signal detector 1 during operation of the actual turbine can be grasped, and the interval between the rotor blades and the rotation signal detector 1 can be appropriately determined. Thereby, there is a danger of the rotor blade and the rotation signal detector 1 being damaged due to the contact between the rotor blade and the rotation signal detector 1, and a decrease in the sensitivity of the rotation signal detector 1 due to the distance being too large. Inconveniences such as a reduction in the reliability of the data due to this can be eliminated, and the reliability of the data of the blade vibration measurement can be improved. According to the present invention, it is possible to solve the problem caused by the interval between the rotor and the rotation signal detector, and to improve the reliability of the blade vibration measurement data. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a rotation signal detector testing device according to an embodiment of the present invention. FIG. 2 is a side view showing a configuration of a gap adjusting jig according to the embodiment of the present invention. FIG. 3 is a diagram for comparing the gap adjustment between the time of blade vibration measurement and the time of verification of the blade of the actual turbine according to the embodiment of the present invention. FIG. 4 is a plot diagram showing data output by the waveform output device according to the embodiment of the present invention. FIG. 5 is a block diagram showing the configuration of a conventional rotation signal detector testing device. [Description of Signs] 1 ... Rotation signal detector 2 ... Micrometer 3 ... Micrometer mounting jig 4 ... Rectifier 5 ... Transfer characteristic calculator 6 ... Waveform output device 7 ... External speed controller 8 ... Motor driver 9 ... Motor Reference numeral 91: drive shaft 10, gear 11, peripheral speed calculator 12, rotary blade 16, yoke 17, permanent magnet 18, detection coil 19, signal line 20, resistance meter

Continuation of the front page (56) References JP-A-7-26901 (JP, A) JP-A-7-63606 (JP, A) JP-A-9-80074 (JP, A) Japanese Patent Publication No. 50-22419 (JP) , B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01P 21/02 G01P 3/488

Claims (1)

(57) [Claim 1] A verification device of a rotation signal detector for verifying a rotation signal output from a predetermined rotation signal detector, wherein a driving means for driving a predetermined gear; A rotation signal detector that is installed opposite to the gear and has a function of adjusting an interval formed with the gear; a first calculating unit that calculates a peripheral speed of the gear based on a rotation speed of the driving unit; A second calculating means for calculating an output voltage of the rotation signal detector per unit circumferential speed of the gear based on the peripheral speed calculated by the first calculating means and an output voltage of the rotation signal detector; And an output means for outputting a calculation result of the second calculation means. A verification apparatus for a rotation signal detector, comprising: