JPS6252813B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration monitoring device for monitoring the operation of rotating machines such as steam turbines, gas turbines, generators, compressors, and blowers.

All conventionally used vibration monitoring devices of this type detect the absolute value or the rate of change of the absolute value of the amplitude of the vibrating body.

That is, as shown in the block diagram of FIG.
The amplitude A of the rotating machine obtained by the vibration detector is converted into a signal B by a signal converter, and this signal B is compared with a preset value Bs by a comparator, so that the signal B becomes the set value Bs. This type of vibration monitoring device outputs a warning signal, stop signal, etc. when the absolute value of the amplitude is the same and only the phase changes, so it cannot be used as a vibration monitoring device. may be insufficient.

The present invention has been proposed in view of the above circumstances, and is a vibration monitoring system that can display all vibration amplitudes, static positions, etc. as vectors, and monitor the absolute value of the vector, the amount of change in the vector, and the rate of change. The purpose is to provide equipment.

To this end, the present invention provides a reference pulse detector for detecting a reference pulse generated by a reference pulse generating means attached to a vibrating body, a vibration detector for detecting the amplitude of the vibrating body, and an output of the reference pulse detector. and the output of the vibration detector, and calculates and outputs a three-component vector of a static position vector of the vibrating body, a fundamental wave component vector, and a second harmonic component vector, respectively; The present invention is characterized by comprising a comparison calculation device that inputs each component vector, compares it with each component set value, and outputs an alarm signal depending on the magnitude relationship, and a recording display device that records each of the three component vectors. .

An embodiment of the present invention will be explained with reference to the drawings.
FIG. 2 is a block diagram thereof.

In the above diagram, 1 is a rotating machine driven by a prime mover 2, and 3 is a photoelectric, electromagnetic, overcurrent, etc. a reference pulse detector that detects one or more pulses per rotation using a detector; 4 a plurality of vibration detectors that detect shaft vibrations or bearing stand vibrations of the prime mover 2 and the rotating machine 1 as electrical signals; 5 inputs the output of the reference pulse detector 3 and the output of the vibration detector 4 and performs calculations to output a static position vector 6, a fundamental wave component vector 7, and a second harmonic component vector 8, respectively. 9 is a three-component vector consisting of a static position vector 6, a fundamental wave component vector 7, and a second harmonic component vector 8 output from the analog vector calculator 5 (the magnitude and phase angle are expressed as real numbers). component and imaginary component), compares each component vector 6, 7, and 8 with the set value 10, and outputs an alarm/stop signal 11 when each component vector exceeds the set value 10. or a digital comparison calculation device; 12 is a recording and display device that displays the static position vector 6, fundamental wave component vector 7, and second harmonic component vector 8 output from the analog vector calculation device 5 on display screens 13 and 14, respectively; It is.

According to such a vibration monitoring device, it is possible to directly grasp vibrations as vector changes, which previously focused only on the magnitude of vibrations, making it impossible to understand them as vectors and making it difficult to determine the cause. Therefore, changes in the shaft center position are considered as changes in the static position vector, and changes in the unbalance of the rotating body and its direction, bending of the shaft, bending due to shaft contact, damage to the blades, changes in the bearing condition, etc. are the fundamental wave components. As vector changes, excessive misalignment, shaft cracks, etc. can be detected as changes in the fundamental wave and second harmonic component vectors, respectively.

Furthermore, if necessary, it is also possible to detect harmonic component vectors of the third harmonic or higher to facilitate investigation of the cause of vibration.

In short, according to the present invention, there is provided a reference pulse detector that detects a reference pulse generated by a reference pulse generating means attached to a vibrating body, a vibration detector that detects the amplitude of the vibrating body, and a vibration detector that detects the reference pulse. a vector calculator that inputs the output of the vibration detector and the output of the vibration detector, calculates a three-component vector of a static position vector of the vibrating body, a fundamental wave component vector, and a second harmonic component vector, and outputs the respective vectors; , comprising a comparison calculation device that inputs each of the three component vectors, compares them with respective component set values, and outputs an alarm signal depending on the magnitude relationship; and a recording display device that records each of the three component vectors. As a result, the present invention is extremely useful industrially because it provides a vibration monitoring device in which the cause of vibration can be easily investigated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a known vibration monitoring device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Figs. 3 A and B are partially enlarged views of the recording display screen in Fig. 2. It is. DESCRIPTION OF SYMBOLS 1... Rotating machine, 2... Prime mover, 3... Reference pulse detector, 4... Vibration detector, 5... Analog vector calculator, 6... Static position vector, 7
...Fundamental wave component vector, 8...Second harmonic component vector, 9...Analog or digital comparison calculation device, 10...Each component setting value, 11...Alarm/
Stop signal, 12... Recording display device, 13, 14...
...display screen.

Claims (1)

[Claims] 1. A reference pulse detector that detects a reference pulse generated by a reference pulse generating means attached to a vibrating body; a vibration detector that detects the amplitude of the vibrating body;
A vector that inputs the output of the reference pulse detector and the output of the vibration detector, calculates a three-component vector of a static position vector of the vibrating body, a fundamental wave component vector, and a second harmonic component vector, and outputs each vector. A computing unit, a comparison computing device that inputs each of the above three component vectors, compares them with respective component set values, and outputs an alarm signal depending on the magnitude relationship, and a recording display device that records each of the above three component vectors. A vibration monitoring device characterized by: