JPS586419A - Water level measuring device - Google Patents

Abstract

PURPOSE:To obtain a small-sized and easy-to-handle titled device with high accuracy, by using a reflecting board and an optical detector at a detecting part to produce a pulse to detect the reflecting zone and the turning direction. CONSTITUTION:A reflecting board and an optical detector are used at a water level detecting part. A reflecting board 11 turns with a change of the water level, and this change is detected by an optical detector 12 and then fetched to an amplifier 14 via an optical cable 13. The signal of the change is fed to a discriminating circuit 15, and the changing direction of the water level is discriminated. At the same time, a numerical counter circuit 16 is provided and set at the initial level of water by a numerical setter of an initial water level setter 17 and a setting switch 18. Furthermore an output circuit 19 is added to draw out the contents of the circuit 16. The output of the circuit 19 is compared with a warning water level set by a setter 20 through a comparator 21. Then the warning for a low level of water is drawn out through an output device 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water level measuring device 1 in a hydroelectric power plant.

There are two types of conventional water level transmitters: a quantitative type using a potentiometer, and a numerical type using a code plate, ultrasonic waves, etc. Figure 1 is an explanatory diagram of the quantitative formula using the position indicator 1, but this method is such that if the position indicator 1 is rotated once within the water level range in use, the gear mechanism 2t-design changes every time the water level range in use changes. There is an inconvenience that it must be manufactured. On the other hand, if gears are manufactured for different water level ranges, it is inevitable that the decomposition ability will decrease. For pottery 3, float 4 is a rotating body, and 5 is a weight 9.

The usage of the water level transmitter at the Nine Hydroelectric Power Plant is as shown in Figure 2, so it is common to send the water level display using a separate Sershin device.Equipped with both a position indicator and a Sershin device. Because of this, the price is high and the device is large.0 Note that 6 indicates the water level measurement range and 7 indicates the water level adjustment range. In a digital water level transmitter using a code plate, the water level measurement range Ii is limited by one revolution of the code plate. Therefore, in order to improve the measurement accuracy, K has to manufacture a code plate corresponding to the measurement range, and since a brush is used for reading the code plate, wear is inevitable.

The present invention was developed in view of these points, and lightning surges are prevented by using an optical fiber in the detection section, and the water level measurement range can be tracked in any water level range. It also has high accuracy and can detect subtle changes in water level.

Next, the present invention will be explained with reference to the drawings. As shown in FIG. 3, the reflector 11#i rotates clockwise or counterclockwise in response to changes in the water level. This change is detected by the photodetector 12,
The signal is distributed to the amplifier 14 via the optical cable 13t.

This signal is inputted in the form of one pulse per water level change to the rotation direction discrimination circuit 15, the direction of water level change is discriminated, and either output 5m or 5b is output. Numerical counting circuit 1
6 is set to the initial water level by the numerical setting device of the initial water level setting device 17 and the setting switch 18. Now, assuming that the water level has risen, the output 15aK is output equal to the number of pulses corresponding to the rise. Numerical counting circuit 16Fi increases the number of pulses to change the water level from the initial state of scooping. When the water level drops, the count is decreased by the number of pulses in 15b. This is a drive circuit for outputting the contents of the numerical counting circuit 16 to the outside of the output circuit 19#i. The setting device 20 is used to set the alarm water level and continues to issue an alarm as long as the actual water level is compared with the output of the output circuit 1-9 by a comparator 21 and is greater than the set running value. Further, 22 is an output device which outputs a low water level alarm by connecting the output of the comparator 21. Figures 4 to 6 show the reflection @ 11 and photodetector 12 in Figure 3.
is detailed. FIG. 4 shows their positional relationship, and FIG. 5 shows details of the reflector 11, where 31 is a reflective band and 32 is a non-reflective one. The relationship between the reflective zone 31 and the reflective zone is such that a change in water level of 1 m+ is detected. 33, 34, and 35 are optical cables. Figure 11!6 shows the normal phase position of the photodetector, and three photodetectors are used to generate pulses to detect the reflection band and the direction of rotation.

The present invention does not use various gears, alarm cams, etc. that cause wear, which are the drawbacks of conventional systems, and it is possible to manufacture a device with high accuracy. In addition, installation and adjustment are easy and can be easily done in a short period of time by simply setting each water level value on the setting device. However, since the present invention has an i-configuration that does not use position detectors, cell sensors, cams, limit switches, etc., it can be made very small and can be manufactured easily, and it is reliable even against lightning surges because it uses optical cables. (a very stupid person) and lightning arresters are no longer necessary. Therefore, overall, it is very inexpensive.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional position indicator, Fig. 182 is an explanatory diagram showing a water level measurement range, Figs. The figure is a detailed explanatory diagram of the reflector and optical sensor of FIG. 3. 11...Reflector 12...Photodetector 13.
... Optical cable 14 ... Amplifier 15 - Discrimination circuit 16 ... Numerical counting circuit 17 ... Setter I9 ... Output circuit 21 ... Comparator (7317) Agent Patent attorney Noriyuki Chika (
and 1 other person) 1vA Figure 3 Figure 4 Figure 5 Figure 6 Figure 4

Claims (1)

[Claims] The water level detection part of the water level transmitter uses a reflector and a photodetector and is composed of an amplifier, a rotation direction discrimination circuit, a numerical counting circuit, an initial water level setting device, a setting switch and output circuit, a comparator, and an output device. A water level measuring device characterized by: