JPS6280517A - Water level measuring instrument - Google Patents

Abstract

PURPOSE:To obtain a high-accuracy measured value and also calculate a water level predicted value on the basis of the measured value by converting variation in pressure by a spring which expands following up fluctuations of a float into a water level value. CONSTITUTION:Water level values Ho-Hm obtained by a converting device 3 are water level values at time points to-Tm and stored in the memory part of a water level estimating device 5. Further, a water level value H1 (i=0, 1, 2-m) is compared by a comparator with its last value any time so as to eliminate the influence of water level variation due to disturbance; only when Hi-Hi-1<=C0 (C0: constant), a gate circuit is opened and the value is read in the memory and stored as data. Then, when the start time of estimation is denoted as tk-1, the inclination of an estimate curve between said time and the time tk is expressed as Hk-Hk-1/tk-tk-1, so the water level at the time tk is (Hk-Hk-1/tk-tk-1).tk+Hk-1. Said arithmetic is carried on up to time tm and the inclination (g) of the curve is operated to estimate the water level Hn at time tn.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water level measuring device.

[Conventional technology]

FIG. 4 is an explanatory diagram of the water level measuring device shown in, for example, Japanese Patent Application No. 59-239367. In the figure, (1) is the outer box of the water level measuring device installed on the water surface (A), and (2) is A float (3) is provided in the outer box (1), a converter (3) is attached to the top of the outer box (1), and (4) is a spring that connects the float (2) and the converter (3).

The conventional water level measuring device is configured as described above, and when measuring the water level, an outer box (1) is installed at a measuring point on the water surface. When the water level at the measurement point fluctuates, the float (2) moves up and down, and the spring (4) expands and contracts accordingly.The pressure change caused by this expansion and contraction is converted into a measured water level by the converter (3), and the water level is adjusted accordingly. value is obtained.

[Problem that the invention seeks to solve]

Conventional water level measuring devices such as those described above measure the water level at a single point, so they can directly detect water level vibrations caused by transient turbulence of a part of the water surface due to discharge of stored water, etc., or partial water level changes caused by wind-induced waves. Since it is measured as a water level, highly accurate measurement values cannot be obtained. Furthermore, since the measured value is instantaneous, there is a problem in that when the water level is rising or falling, the measured value when the water level reaches a steady state cannot be determined unless continuous measurement is performed.

The present invention has been made to solve these problems, and eliminates water level vibrations, water level changes, etc. that occur locally on the water surface, and allows highly accurate measurement values to be obtained. The purpose of the present invention is to obtain a water level measuring device that can also calculate predicted values.

[Means for solving problems]

Water level measuring device according to the present invention (flow 1-), a spring that expands and contracts following the vertical fluctuation of this float, and a conversion device that converts the pressure change due to the expansion and contraction of this spring into a water level value. A predicted water level is calculated by a water level estimating device based on a measuring mechanism and a water level value measured by the water level measuring mechanism.

[Effect]

In the present invention, even if there is a partial water level vibration or water level change on the water surface, the water level is predicted based on the measured value that eliminates the influence, so the water level can be predicted with high accuracy without waiting for the passage of time. You can get it.

〔Example〕

FIG. 1 is an explanatory diagram of a water level measuring device showing one embodiment of the present invention. In the figure, (1) to (4) are the same as the conventional device described above, and (5) is a water level estimation device for predicting the water level based on the measured value transmitted from the conversion device (3). , (6) are signal lines that transmit the measured values from the conversion device (3) to the water level estimation device (5).

In the water level measuring mechanism configured as described above, the water level is measured in the same manner as a conventional water level measuring device, and the measured value is transmitted to the water level estimating device (5) through the signal line (6). In (5), a predicted value of the water level is calculated.

Next, regarding the calculation operation of the predicted water level value, see Figure 2 and
The details of the water level estimating device (5) will be explained based on FIG. 3. The water level value obtained by the converter (3) is Ho,
HIn! -12-H-. H. , Hi H2-
H.

are the water level values of j O+ L In j 2+""□, respectively, and are MPA'd into the memory section of the water level estimating device (5).

In addition, the water level value H1 = Q, l, 2 - m) is always compared with the previous value using the comparator shown in Figure 3 in order to prevent the influence of water level changes due to disturbances such as water level vibration or local water level fluctuations. It is assumed that the gate circuit is opened only when the following conditions are satisfied: H, -H, ≦Co (Co is a constant and is set depending on the situation of the installation position), and the data is read into the memory and stored as data. If the above conditions are not met, the previous value is used for calculation. Next, if the predicted initiator is L, -8, then
The slope of the predicted curve between time 1 and is HkHk-+/l
Since the water level Hk at time 1k is expressed as kt k-1, the water level Hk at time 1k is Hk = (Hk-Hk-+/ t * t k
−+) Jin, + Hk−. The above calculations are executed until time Lm, and the slope g of the curve is calculated and grasped to estimate the water level H at time 1n.

Therefore, by the above calculation, the water level Hn1. at time t0 is determined from the time Lk-. tHr, = g・t ll
10Hh-+ (g is calculated from the time 1m obtained from the calculation result.

), and this becomes time t. is the predicted water level value.

In the above embodiment, the measured value is transmitted through the signal line (6), but the same operation can be obtained even if the measured value is transmitted wirelessly.

〔Effect of the invention〕

As explained above, the present invention has a simple structure that checks whether the measured values of the water level measuring mechanism are within a certain range of change, accumulates them, and estimates the water level based on this. This method is effective in that it is possible to exclude at1 constant errors caused by disturbances such as partial water level vibrations or partial changes in the water level, and to obtain a predicted water level value.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram of operation explaining the calculation principle of the embodiment, Fig. 3 is an explanatory diagram showing the contents of the water level estimating device, and Fig. 4 is an explanatory diagram showing the contents of the water level estimation device. FIG. 2 is an explanatory diagram showing a conventional water level measuring device. In the figure, (1) is the outer box of the water level measurement mechanism, (2) is the flow 1-, (3) is the conversion device, (4) is the spring, and (5)
(Water level estimating device, (6) is a signal line. The same reference numerals in each figure indicate the same or corresponding parts. Agent: Patent attorney Masaru Sato Figure 1: Outer box 2: Float 3: Recording device 4°/V: + Clearance! Culm 3rd figure 4th figure 1 -A

Claims (1)

[Claims] A water level measuring mechanism consisting of a float, a spring that expands and contracts to follow the vertical fluctuations of the float, and a conversion device that converts pressure changes due to the expansion and contraction of this spring into water level values, and the water level measured by this water level measuring mechanism. A water level measurement device consisting of a water level estimation device that calculates a predicted water level based on water level values.