JPS58221134A - Monitoring device for hydraulic thrust of hydraulic machine - Google Patents

Abstract

PURPOSE:To discover the abnormality in a hydraulic machine in an early time and to store the analyzed data in the stage of abnormality by detecting the compression rate of a compression pipe using thrust with a sensor, comparing the signal value thereof with a set value by a calculating means, and operating an alarm device. CONSTITUTION:The thrust of a hydraulic machine is transmitted with a pad to a compression pipe 4 and the bottom end of a measuring bar 7 is displaced downward by the compression thereof. A gap sensor 10 engaged with a measuring plate 9 stuck to the bottom end of the bar 7 detects the compression rate of the pipe 4 and the signal thereof is converted to an electrical signal with a converter 11. The signal is added with an adder 12, and the resulted total hydraulic thrust is compared with the set value displayed on an alarm setter 15 by a comparator 16, and when the thrust exceeds the set value, an alarm relay 17 is operated. The hydraulic thrust is thus monitored at all times, and the abnormality is discovered in an early time from the recognition of the pattern recorded in a recorder 13. It is also possible to store the analyzed data in the stage of abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic thrust monitoring device for a hydraulic machine, and more specifically, a device for monitoring hydraulic thrust generated in a thrust bearing of a water wheel of a hydroelectric generator, a pump-turbine, etc. , relates to a hydraulic thrust monitoring device for hydraulic machinery.

Conventionally, in order to evenly distribute the load on the thrust bearings of hydraulic machines, the load on the thrust bearings was measured only during adjustment, and during installation, the instructor used a dial gauge to measure the load on the thrust bearings. . To explain the stiffness for the 11th and the 1st time, in a thrust bearing in which multiple pads are arranged on the same circumference as shown in Fig. 1, the total thrust of the weight of the rotating part of the hydraulic machine and the hydraulic thrust is , as shown in FIG. The lower end of the compression pipe is fixed to the outer box 5 with screws, and
is supported by support stand B. A measuring rod is provided inside the compression tube, and the lower end of the measuring rod protrudes downward from the compression tube. In such a configuration, when the total thrust of the hydraulic machine increases, the compression tube is compressed in the length direction, and the lower end of the measuring rod 7 is displaced downward. This amount of displacement was measured using a dial gauge (not shown) and adjusted using adjustment bolts so that the load on each pad l was equalized.

Conventional devices such as J7K1 and above have the disadvantage that the hydraulic thrust cannot be constantly monitored after the hydraulic machine enters commercial operation.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it is possible to constantly monitor the amount of compression of the compression pipe (7) to detect abnormalities in the water turbine runner early, and to detect abnormalities in the thrust bearing. The object of the present invention is to provide a hydraulic thrust monitoring device for hydraulic machinery that can accumulate analysis data.

The present invention will be described below with reference to an embodiment shown in FIG.

In the figure, there are n compression pipes on the circumference as shown in Figure 1.
In other words, the kneading dough was arranged at a size of %n from 應/, and in FIG. 3, for convenience, the kneading dough was shown vertically as L7. Compression tube 4. Outer box 5. The measuring rod 7 and adjustment bolt t are the same as those shown in FIG. 2, and their explanation will be omitted.

A measurement plate 9 is fixed to the lower end of the measurement rod, and a gap sensor IO detects the amount of compression of the compression pipe by engaging with the measurement plate 9. A conversion device converts the gap signal of the gap sensor lθ into an electrical signal. an adder/-1 recorder/3. which adds the signals from the plurality of transducers l/ and outputs a signal corresponding to the total hydraulic thrust signal; Provide a power source/da. Furthermore, an alarm setting device/S is provided, and its setting value and the output of adder 7.2,
That is, the total water pressure thrust is compared with the comparator /6. When the total water pressure thrust of i to 2 exceeds a set value, the alarm relay /2 is operated.

Next, the operation will be explained in more detail.

Under conditions where only the weight of the rotating part of the hydraulic machine is applied to the thrust bearing, use a dial gauge to measure each pad/
K So that the applied load is even.

After adjusting the adjustment bolt ff, the distance between each measuring plate D and each gap sensor lθ is set to a constant reference value (3), and the output of the converter // is adjusted to zero at this time.

The amount of compression of each compression pipe, that is, the amount of displacement of the measurement plate ΔL n
(mm) is proportional to the amount of change in thrust load ΔPn, so let α be the proportionality constant.

ΔLn−α·ΔPn (1). On the other hand, the electrical signal output change amount ΔVn of the converter // is ΔL
Since it is proportional to n, let the proportionality constant be β.

ΔVn −β−ΔLn,
(,2), and from equations (1) and (,2), ΔV
n-α skewer β・ΔPn (,?) Therefore.

Therefore, the total hydraulic thrust P actually applied to n pads L is
teeth.

n-/ Therefore, (Goo, (from the j1 expression.

(4I) is obtained. By calculating the sum of the output signals of the transducer/l, the total hydraulic thrust can be determined.

In the above embodiment, the case where n pads/K n gap sensors 10 are provided has been described, but normally the number of pads in a thrust bearing of a hydraulic machine is quite large, and it is difficult to calculate the load on each pad. Since the balance can be adjusted within 3%, the gap sensor IO can be used at the expense of some accuracy.
It is conceivable to reduce the number of components to create an inexpensive configuration. In that case, assuming that the loads on each of the n pads l are perfectly balanced, the total water pressure can be easily calculated using the following equation, where k is a constant, using the detection signals of the m gap sensors io, which are smaller than the number of pads n. Thrust force can be determined.

P−−ΣK・Δ■(7) Also, in one or more embodiments, recording the total hydraulic thrust.

Although only abnormal alarms are possible, by arranging alarm devices and recorders for each converter, one
Detection of individual pad imbalances.

Can be monitored.

Furthermore, recently, a technology for predicting abnormalities in hydraulic machinery by inputting various sensor signals into a computer is being developed, and it can also be applied to the gap sensor in this invention. .

By capturing the temperature signal of the thrust bearing oil tank and the temperature signal of the air around the thrust bearing, it is also possible to correct errors caused by elongation due to the temperature difference between the compression pipe and the assembled measuring rod.

As is clear from the above description, this invention has the following features.

By constantly monitoring the hydraulic thrust of the thrust bearing, it is possible to detect, for example, an increase in the hydraulic thrust due to wear or damage to the upper seal ring of the water turbine launch, a decrease in the hydraulic thrust due to wear or damage to the lower seal ring, etc. It is also possible to provide data for analyzing the cause of pad temperature rise, and to quickly detect abnormalities by recognizing changes in hydraulic thrust during normal conditions using recorder paper, etc.
We can expect remarkable effects.

[Brief explanation of the drawing]

Figure 7 is a plan view of the main parts of a conventional thrust bearing, and Figure 1 is the TI-I! The enlarged sectional view and FIG. 3 are wiring diagrams of an embodiment of the present invention. l-pad, co-runner 1. ? ··disk. D...Compression pipe, S...Outer box, 6...Support stand, 7...Measuring rod, T...Adjustment bolt, T...Measuring plate, lθ...Gap sensor, //...Converter, / 2... Adder, /3...
Recorder, /da...power supply, /S...alarm setting device, /7...
Comparator, /7...Alarm relay. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - (7) Figure 1 and Figure 2 (Za)

Claims (1)

[Claims] (/l A sensor that detects the amount of compression in the compression tube of the thrust bearing, a converter that converts the signal from this sensor into an electrical signal, and a signal value from this converter that is compared with a set value. (7) A water pressure thrust monitoring device for a hydraulic machine, characterized in that it is equipped with a calculation means that activates an alarm device. A hydraulic thrust monitoring device for a hydraulic machine. (3) The hydraulic power machine according to claim 7, wherein the calculating means includes an adder for adding signals from converters connected to five plurality of sensors. Hydraulic thrust monitoring device for a machine. (d) The hydraulic thrust monitoring device for a hydraulic machine according to claim 1, wherein the sensor is a gap sensor that engages with a measuring plate fixed to a measuring rod coupled to a compression pipe. .