JPS5872015A - Method and device for monitoring abnormal oscillation of fluid machine - Google Patents

Abstract

PURPOSE:To monitor abnormal oscillations by determining the flow rate and oscillation level of a fluid machine in the stage of the normal operation thereof beforehand, multiplying the prescribed parameters corresponding to the flow rate, using the values thereof as permissible values and comparing the permissible values for the measured flow rate and the measured oscillation level. CONSTITUTION:A storage device 2 outputs the values B1 and B2 corresponding to the flow rate ratio (q) of a fluid machine 1 to a comparator 7, which values are compared with DELTA in said comparator 7, and when B1<DELTA, an alarm device 8 is actuated and when B2<DELTA, a switch 9 for stopping the machine 1 is actuated. If, for example, the flow rate Q=0.5Q0 is measured with a flow rate detector 3, the output of a divider 4 is q=50, and from the device 2 the value B1=3.0, B2=6.0 is outputted to the comparator 7. An oscillation level delta is divided by delta0 in an operator 6, whereby the ratio DELTA of the oscillation level when 100% flow rate is determined. The resultant DELTA and the B1, B2 are compared in the comparator 7, and the device 8 is actuated at DELTA>3.0 and the switch 9 at DELTA>6.0.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitoring method and apparatus for monitoring abnormal vibrations of a fluid machine.

When monitoring the vibration of a general machine, a vibration detector is installed on a part of the machine, and the overall amplitude of the electrical signal obtained by the detector is determined by
The vibration level is compared with a preset vibration level, and if the detected value exceeds the set value, an alarm or stop F signal is issued.

Although this method is very effective when monitoring abnormal vibrations in ordinary machines, it is important to note that when monitoring any fluid machine, it is important to The rate of change in the vibration due to the change in the flow rate of the fluid machine is greater than the change in the flow rate of the fluid machine, and it is only possible to accurately monitor the difference in the fluid machine.

The vibration level during normal operation of fluid machinery is generally 100%.
The case of flow rate is the smallest, and if it is set as 100, then Fig. 1A will change as the flow rate changes.

The vibration level changes as shown in B. Therefore.

Based on a certain vibration level, for example, the vibration level of 100% flow rate, an alarm is issued when twice the vibration level occurs, and the fluid machine is stopped when four times the vibration level occurs. Then, in case of A, 62%
Even if the system is operating normally at low flow rates, an alarm will be issued.
Furthermore, if normal operation with a flow rate of 25% is reached, it will be stopped.

The present invention eliminates these drawbacks.The present invention calculates in advance the flow rate during normal operation of a fluid machine and the vibration level at that flow rate, multiplies it by a predetermined parameter depending on the flow rate, and uses that value as an allowable value. By measuring the flow rate and its vibration level of the fluid machine, and comparing the measured vibration level with the permissible value for the measured flow rate, abnormal vibrations are monitored at I-. ,I will provide a.

Further, as an embodiment of the method of the present invention.

Determine the vibration level divided by flow (V) during normal operation of the fluid machine, and store the value by setting the parameter corresponding to flow II (1-memory-1714l/bel). A memory device, a flow rate detector that measures the flow !11 of the two-distribution machine, and a flow rate detector that measures the flow 111 of the one-distribution machine (movement 1).
/Vibration detection to measure the bell+A1 (and 1 mark 1)) constant'A1tkoflow h1 corresponding to 10 marks memory)! : Write in 1
A comparator that compares the measured vibration level with the N-neared I11-1.

and an indicator activated by the output of the comparator.

Characteristics of the present invention (The point is that even when the fluid machine is 1L, it moves and changes the flow 111 even when it is 1L), (i(I
and tCru. The reason is that the r'1 valley value is changed according to the flow rate.

It is assumed that the vibration level of the above-mentioned J-Uni fluid machine during normal operation is shown by the solid line II in Figure 1. ,
(The vibration level at normal flow rate of 100% is measured in advance as 10.) For this vibration level 11, parameters are set according to the flow rate to determine the permissible value.

A simple constant is 2. and the alarm tolerance value 111. with 4 as its parameter. and a tolerance value B2 for stopping.

When monitoring a fluid machine in actual operation, its flow rate Q and vibration level δ are measured, and the above-mentioned allowable values n, [l, at the flow rate Q and the measured vibration level δ (in the expression shown in Figure 1) are To be faithful, compare the ratio Δ) with the normal vibration level δ0 at 100% flow rate, and if it exceeds the tolerance value B1, issue an alarm, and if it exceeds the tolerance value n, stop the fluid machine. The monitoring method according to the present invention performs monitoring by, for example, performing the following steps.

It embodies the method of the invention. The invention will be further illustrated in one embodiment of the apparatus shown in FIG.

1 is a fluid machine to be monitored, and its vibration level during normal operation is shown in Fig. 13.
The time of 100% flow is set as 10.

The parameters defined for this are the constants 2 and 4, and the tolerance value 1. +12 is stored in the equalization memory C2 with respect to the flow j7+.

3 is the flow 11 of 1 Ai body which is 111 drawn out from the fluid machine 1.
It is a flow rate detector that measures 1.
', (The 1 and 4 that are divided by il i++1 are dividers -), and even the flow rate Qo at 100% of the fluid machine 4Mil is -). then 1
The value q is inputted into the memory 2.

51. A vibration detector that determines the overall vibration level of the fluid machine 41QI measures the vibration level δ and inputs it to the operator (). In the calculator 6, the vibration level δ0 at the time of the flow rate of the fluid machine 1 is set.
), )・The output δ of the memory motion detector 5 is divided by δ0 and the first value Δ thereof is input to the monitor 7.

On the other hand, the memory 2 stores a value 13. corresponding to the flow fit, It q of the fluid machine 1. and B2 are output to the comparator 7, which compares them with Δ and activates the 9 indicator. Specifically, when IL<Δ, the alarm 8 is activated, and when 132<Δ, the fluid machine 1 is activated. Switch 9 is activated to stop the operation.

For example, fluid machine 1 is being driven, and its flow rate Q ””
If 0.5 Qo is measured by flow rate detector 3, then
The output of the divider 4 becomes q-50, and from the memory 2 H, -3,
0, H2=6.0 is output to the comparator 7. On the other hand, the vibration level δ measured by the vibration detector 5 is calculated as B by the calculator 6.
Divided by 0, the vibration level ratio Δ at 100% flow rate is determined. Comparator 7 compares this Δ with 13 and B2.

Alarm 8 is activated when Δ>30 Switch 9 is activated when Δ>60 I'm going to do it.

As described above, in the monitoring device according to one embodiment of the present invention.

Since the allowable vibration level is changed depending on the flow rate of the fluid machine, it is possible to distinguish between an increase in vibration due to a change in flow rate and an abnormal increase in vibration of 31°. c) It is possible to catch abnormalities in one machine.In the above embodiment, the fluid machine is 1kQ) (1[I:1I
In V), we made it clear that the flow changes depending on the flow 1) 1, and gave an explanation based on
0% flow rate Qo and its fluctuation during normal operation 1'ilj level δ
n 0) Have you installed jll″1 to configure the monitoring device?
Let's take the wave 1lIII nohel and the flow rate as raw data, and store the values corresponding to part II in the notes 1' and 1nia.
and 17, this seems to be more common.

Furthermore, the constants 2 and 4 are used as parameters corresponding to the flow rate in this embodiment, or the functions 11+ (Q) and 11. which change according to the A7 flow rate Q are used. You may also use ((之).

[Brief explanation of the drawing]

FIG. 1 is a diagram of the flow of the fluid machine, the oscillation i+1111/,
FIG. 2 is a block diagram of an apparatus showing an embodiment of the present invention. 1: Fluid machine, 2: Memory device, 3: Flow rate detector. 5: Vibration detector, 7: Comparator, 8: Alarm, 9: Switch (9)

Claims (2)

[Claims] (1) Determine in advance the flow rate and vibration level at that flow rate during normal operation of the fluid machine, multiply by a predetermined parameter corresponding to the flow rate, use that value as an allowable value, and measure the flow rate and vibration level of the fluid machine. , a method for monitoring abnormal vibrations in a fluid machine, in which abnormal vibrations are monitored by comparing a measured vibration level with a permissible value for the measured flow rate. (2) A memory device that determines in advance the flow rate during normal operation of the fluid machine and the vibration level at that flow rate, multiplies the vibration level by a parameter corresponding to the flow rate, and stores the value, and measures the flow rate of the fluid machine. a flow rate detector,
and a vibration detector that measures the vibration level of the fluid machine. a comparator that compares the value stored in the storage device corresponding to the measured flow rate with the vibration level measured in -;
An abnormal vibration monitoring device for a fluid machine, comprising a display device that operates by 1° in response to the output of the comparator.