JPH07182048A - Water level controller - Google Patents

Abstract

PURPOSE:To stably control a water level for a distributing reservoir accurately corresponding to the substantial fluctuation of a water distribution amount flowing out from the distributing reservoir. CONSTITUTION:An opening degree signal based on the detection of the opening degree of a flow valve 4 provided on the inflow side of the distributing reservoir 1 and a water level signal based on the detection of the water level WL of the distributing reservoir 1 are inputted to a controller 7 for the inflow valve. The controller 7 performs flow rate deviation control in which the ratio of the present water distribution amount obtained from the product of water level change per unit time and the area of the distributing reservoir to the reference water distribution amount of the distributing reservoir 1 is defined as a deviation when the water level WL of the distributing reservoir 1 is within a fixed allowable fluctuation range A for a set value WLo, and performs water level control when the water level WL of the distributing reservoir 1 is within an abnormal fluctuation range B exceeding the allowable fluctuation range A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the opening of an inflow valve provided on the inflow side of a distribution reservoir so that the amount of water held in the distribution reservoir is within a certain range regardless of the amount of outflow from the outflow side. The present invention relates to a water level control device that is retained inside.

[0002]

2. Description of the Related Art Conventionally, in this type of device, the water level in a distribution reservoir is detected, and if the detected water level changes with respect to the set water level, the inflow valve is turned on / off by directly controlling it.
Control or measure the inflow side flow rate of the reservoir with a sensor, determine the inflow rate set value according to the water level in the reservoir, and automatically adjust the inflow valve so that the inflow rate corresponds to the predetermined water level. ON / OFF control was performed.

[0003]

In the conventional water level control device having the above-mentioned structure, the on / off control of the inflow valve is only repeated depending on the level of the water level in the distribution reservoir. However, when the outflow amount, that is, the amount of water distributed to the demand side, fluctuates greatly, it is difficult to keep the water level in the distribution reservoir constant quickly.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a water level control device capable of performing stable water level control according to fluctuations in the water distribution amount and the like.

[0005]

In order to achieve the above object, a water level control device according to the present invention comprises an opening detector for detecting the opening of an inflow valve provided on the inflow side of a reservoir. A water level detector that detects the water level of the reservoir, and an inflow valve controller that receives the opening level signal from the opening level detector and the water level signal from the water level detector, the controller,
When the water level of the distribution reservoir is within a certain allowable fluctuation range with respect to the set value, the ratio between the current distribution amount obtained from the product of the water level change per unit time and the distribution reservoir area and the reference water amount of the distribution reservoir is deviated. As a flow rate deviation control for proportionally controlling the opening degree of the inflow valve, the water level control is performed when the water level of the distribution reservoir is in an abnormal fluctuation range exceeding the allowable fluctuation range. is there.

[0006]

According to the present invention, when the water level signal from the water level detector and the current opening signal of the inflow valve are input to the inflow valve controller, the controller keeps the water level in the reservoir constant relative to the set value. If it is within the allowable fluctuation range of, the flow rate deviation control is performed, and if the water level of the distribution reservoir is within the abnormal fluctuation range exceeding the allowable fluctuation range, the water level control is performed. In other words, when the water level falls within the abnormal fluctuation range due to large fluctuations in demand on the demand side, the water level control can quickly recover the water level within the allowable fluctuation range, and then converge to the set value by the flow deviation control. This enables stable water level control according to the capacity of the distribution reservoir and the amount of water distribution.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a water level control device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a water reservoir to which an inflow side pipe 2 and an outflow side pipe 3 of water W are connected, and an inflow valve 4 is provided in the inflow side pipe 2. 5 is an opening detector for detecting the opening of the inflow valve 4, 6 is the reservoir 1
2 is a water level detector for detecting the water level WL of

An inflow valve controller 7 receives the opening signal from the opening detector 5 and the water level signal from the water level detector 6 to control the inflow valve 4, and has a water level set value WL.
o, the area of the distribution reservoir 1 and the standard distribution amount are input as data, and the water level by the water level signal is the above set value WLo.
On the other hand, when it is within a certain allowable fluctuation range A that exceeds the dead zone range C, the ratio of the current distribution amount by the product of the water level change per unit time and the distribution reservoir area to the reference distribution amount of the distribution reservoir 1 is deviated. As a configuration, a flow rate deviation control output is sent to the inflow valve 4, and when the water level is in an abnormal fluctuation range B that exceeds the allowable fluctuation range A, a water level control output is sent to the inflow valve 4. Has been done.

Next, the operation of the water level control device having the above configuration will be described with reference to the flowchart of FIG. For the inflow valve controller 7, the set value W of the water level of the distribution reservoir 1 is set.
Lo, the reservoir area and the reference water distribution are input as data, and the opening signal from the opening detector 5 and the water level signal from the water level detector 6 are sequentially input.

In response to the water level signal, the controller 7 determines whether or not the water level WL of the reservoir 1 is within a certain permissible fluctuation range A above the dead zone with respect to the set value WLo (decision step 21). ), If it is within the range A, based on the input data and the water level signal, the current water distribution is calculated from the product of the water level change per unit time and the reservoir area, and the calculated current water distribution and the standard water distribution are calculated. Inflow valve 4 with ratio as deviation
The output of the flow rate deviation control is sent to (process step 22).

From the water level signal, the water level W of the reservoir 1
When it is determined that L is not within the allowable fluctuation range A, the water level WL exceeds the allowable fluctuation range A
If it is within the range B, the output of the water level control is sent to the inflow valve 4 (processing step 24).

Therefore, if the water level changes significantly and the water level WL is in the abnormal fluctuation range B, the inflow valve 4 is turned on and off by the water level control, and the water level WL quickly returns to the allowable fluctuation range A. Therefore, if it is within the permissible fluctuation range A, it is possible to maintain a stable water level corresponding to the amount of water distribution at that time.

[0014]

As described above, according to the present invention, the inflow valve controller performs flow rate deviation control when the water level is within a certain allowable fluctuation range with respect to the set value, and the water level is within the allowable fluctuation range. Since the water level control is performed in the abnormal fluctuation range exceeding the above range, there is an effect that it is possible to always perform stable water level control according to the change in the water distribution amount.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a water level control device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the water level control device in the embodiment.

[Explanation of symbols]

 1 Reservoir 4 Inflow valve 5 Opening detector 6 Water level detector 7 Inflow valve controller A Allowable fluctuation range B Abnormal fluctuation range WL Water level WLo Water level set value

Claims (1)

[Claims] 1. An opening detector for detecting the opening of an inflow valve provided on the inflow side of a distribution reservoir, a water level detector for detecting the water level of the distribution reservoir, and an opening from the opening detector. A controller for an inflow valve that receives a signal and a water level signal from the water level detector, and the controller is configured to change the water level per unit time when the water level in the reservoir is within a certain allowable fluctuation range with respect to the set value. Flow rate deviation control is performed to proportionally control the opening of the inflow valve with the ratio of the current distribution volume obtained from the product of the distribution reservoir area and the standard distribution volume of the distribution reservoir as the deviation, and the water level of the distribution reservoir. The water level control device is configured to perform water level control when is within an abnormal fluctuation range exceeding the allowable fluctuation range.