JPH0116238Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a telemeter measuring device for measuring vibration stress under actual operation of a turbine or the like.

There are many references in the literature about measuring vibration stress in actual machines using the telemeter method, and there are also many examples of measurement using the slip-ring method, even if it is not the telemeter method, if mounting is possible. The slip-ring method is suitable for multi-point measurement, but is limited by its mounting and rotation speed.On the other hand, the telemeter method can measure without contact, so it can be measured without major reworking of the rotating body, and it can be used with transformers. Mitsuta also sells products with high centrifugal strength, which can be applied to high-speed rotation. but,
This high-speed rotation transmitter is expensive,
One transmitter is required for each measurement point.
Multi-point measurement is too expensive. Scanners for switching measurement are also commercially available, but they are expensive. However, in recent years, turbines and compressors are becoming faster, and as a result higher reliability is desired, the need for actual machine measurements is increasing, and it is thought that conventional measurement methods will need to be improved. .

The present invention is a telemeter measurement device that can be used for high-speed rotation under the above-mentioned conditions and is economical due to its multi-point measurement.

First, the power source for the transmitter is an inductive power source instead of a battery type that requires charging or replacement, making it suitable for machines that are difficult to disconnect during operation, and for long-term or long-term intermittent measurements. Also suitable for Of course, this device can also perform measurements using the battery method. Next, the transmitter is for high-speed rotation and can withstand centrifugal acceleration of 30,000G (here G
(gravitational acceleration) is used, one of which is also used with a scanner for 5-point switching measurement, making it possible to measure 5-point switching at 2 points at the same time. By doing this, multi-point measurement can be carried out at a minimum cost, and by using two transmitters, even if one breaks down, the remaining one can take measurements, improving safety in measurement. , increasing reliability.

As described above, this device improves the safety and reliability of telemeter measurements of high centrifugal force fields.
It is characterized by being able to perform multi-point measurements and being economical.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 shows an example of an actual application of this device. This is an example of measuring vibration stress on the first stage rotor blade 2 in an axial flow turbine having three stages of blades approximately in the center of the turbine rotor 1. In such a turbine rotor 1, there is a distance to the shaft end, and measurement using the slip-ring method is difficult due to complicated wiring. A lead wire 4 of a strain gauge 3 attached to the first stage rotor blade 2 is guided through the vehicle panel surface to a capsule 5 containing a transmitter. On the other hand, a receiving antenna for stationary measurement and a glass epoxy resin plate 8 wrapped with an induction power supply coil are attached to an antenna mount 7 protruding from the casing 6, and the signal from the receiving antenna is transmitted via an output lead wire 9. is guided out of the casing 6 and input into the receiver. In an induction power supply, an output generated from an external induction power supply device passes through an induction power supply lead wire 10 and a static primary coil to create a magnetic field, and a secondary coil is wound on a rotating glass epoxy resin plate 11. The transmitter operates by inducing electric power in the coil. In FIGS. 2 and 3, the G1 strain gauge signal enters the transmitter 5a and is transmitted by the transmitting antenna 12a. The strain gauge signals of G2 to G6 enter the scanner 5b, and the signals switched by an external commander are sent to the transmitter 5c.
The signal is then transmitted by the transmitting antenna 12b. Note that the capsule 5d is a dummy for balance. Power for each transmitter 5a, 5c and scanner 5b is supplied from a secondary coil 13B. The antenna mount 7 for reception measurement is divided into two parts: a lower mount 7A and an upper mount 7B.
The antenna mounting ring 14 is fitted and fixed with bolts at the horizontal portion. Further, the lower mounting base 7A is bolted to the casing 6 at the lower part of the machine, and can cover the upper casing of the machine with the antenna section assembled. FIG. 4 shows the inside of the capsule 5. The transmitter 15 is stored by removing the lid 16 and applying a Teflon resin stopper 17, and when taken out, the lid 18 is opened and pushed out. This capsule 5 is screwed into the rotor and fixed with a lock. In FIG. 5, the transmitting antenna 12a
Details of the receiving antenna 19, and the primary coil 13A and secondary coil 13B for induction power supply are shown. Each glass epoxy resin plate 8, 11 is fixed with countersunk screws.

Here, signal transmission and switching operations will be explained in detail based on FIG. 6. First, G2~
When selecting one of G6, a selection command is issued from the receiver 31 to the oscillator 33 via the commander 32, and the oscillator 33 outputs a frequency signal corresponding to the selected number together with the power supply induced frequency. . This selection frequency signal enters the scanner 5b via the secondary coil 13B and transmitter 5c, and is switched to one of G2 to G6 according to the selection frequency signal. Then, the signal from the predetermined strain gauge is sent to the transmitter 5.
c. After entering the receiver 31 via the transmitting antenna 12b and the receiving antenna 19, for example, the recorder 3
Recorded at 4. 35 is, for example, a DC power supply.
Note that there are two transmitters 5a and 5c, and both signals are input to the receiver 31 through one receiving antenna 19. The output frequencies from 5c (for example, 95 MHz) are different from each other, so that the receiver 31 can distinguish them from each other.

Further, the support portions 7C and 7D of the antenna mounting ring 14 of the antenna mounting base 7 are formed into an annular shape, and a turbine rotor shaft (not shown in FIG. 2) is inserted into the inner diameter of the support portions 7C and 7D.

Regarding the measurement of vibration stress during actual operation of rotating machinery, it is important for manufacturers to accumulate data, use it for safety design, and to ensure machine reliability. We may request the manufacturer to confirm the safety of the product. In such cases, the reliability and economy of the measuring device are weighed, and multi-point measurement is desired in order to increase reliability, but doing so would be too expensive. This is especially true for high-speed rotating machinery. In this sense, this telemeter measurement device is capable of simultaneous measurement of 2 points and 5 points.
In addition, unlike the battery type, an induction power source type is used, so there is no need for replacement, making it possible to provide a versatile measuring device for actual equipment. Note that the format of the primary coil, secondary coil, and transmitting/receiving antenna wound on the glass epoxy plate can be designed according to the shape of the rotating body.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a partially cutaway front view of the actual machine, Fig. 2 is an enlarged view of the main part in Fig. 1, and Fig. 3 is a view taken along arrow A-A in Fig. 2. ,
FIG. 4 is a sectional view of the capsule, FIG. 5 is an enlarged view of the main part in FIG. 2, and FIG. 6 is a block diagram illustrating the signal transmission state. 1... Turbine rotor, 2... First stage rotor blade, 3
...Strain gauge, 5...Capsule, 5a, 5c...
Transmitter, 5b... Scanner, 10...
Lead wire for induction power supply, 12a, 12b...Transmission antenna, 13A...Primary coil, 13B...Secondary coil, 19...Reception antenna, 31...Receiver, 32...Commander, 33...Oscillator.

Claims (1)

[Scope of utility model registration request] Strain gauges installed at multiple locations in the circumferential direction of the rotating body, a transmitter buried in the rotating body and connected to one strain gauge, and another transmitter buried in the rotating body and connected to the remaining strain gauges. A transmitter, a transmitting antenna provided at the end of the rotating body to transmit the outputs of both transmitters, a receiving antenna fixedly installed opposite to this transmitting antenna, and a receiving antenna provided between the rotating body and the fixed part. What is claimed is: 1. A telemeter measuring device comprising: an induction power supply device;