JP2864810B2 - Automatic operation control method of drainage machine by reservoir water level management - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic operation control method for a drainage filter provided to secure a water distribution amount of a water supply system, and more particularly to an automatic operation control method for determining an inflow amount of a reservoir from a water level change gradient. About the method.

[0002]

2. Description of the Related Art In order to secure water distribution in a water supply system, it is necessary to control the inflow and outflow of a distribution reservoir. FIG.
It is a lineblock diagram showing an example of a water distribution system. In the figure, raw water such as groundwater and flowing water taken by a water intake pump 51 is once collected in a landing well 52 and then collected by a filtration pump 5.
3 and a plurality of drainers 54a, 54b, 54
The inflows Qr1, Qr2, and Qr3 purified in step c flow into the reservoir 55. To the reservoir 55, a constant inflow Qk from the outer wide area water supply is also added. The water level h of the reservoir 55 is detected by the water level meter 56, and based on the detected data,
The control device 57 controls the operation and stop of each of the drainers 54.
In addition, in order to remove unnecessary substances deposited on the filter layer, the water filter 54 detects the filtration resistance or automatically performs the cleaning every operation for a predetermined time. The water retained in the reservoir 55 is pumped up by a water distribution pump 58 and used for water distribution in the city. 5
The change in the inflow flow rate of No. 5 could correspond to the change in the water distribution flow rate due to the daily life pattern.

[0003]

However, in cities with an increased population, the total amount of water distribution increases and the maximum and minimum values of the amount of water distribution increase. On the other hand, increasing water supply facilities has drawbacks in terms of installation space and cost, and it is desired to make full use of existing facilities. When the distribution flow rate increases and the amount of water retained in the reservoir becomes insufficient, the washing time of the filter is limited to changes in the water level and the amount of water in the reservoir, and it is difficult to automatically operate only by the filtration resistance and the filtration time. And rely on the manual operation of skilled operators. The present invention has been made in view of such a problem, and it is possible to predict a deviation between a water distribution amount and an inflow amount, to control the deviation so as not to be enlarged, to easily correct a set value, and to reduce cost. It is another object of the present invention to provide an inexpensive automatic drainage filter operation control method.

[0004]

Means for solving the above-mentioned problems in the present invention are to monitor the water level of a distribution reservoir in which inflow water from a plurality of filtration machines is stored, and to operate each of the filtration machines. Or in the method of controlling the automatic drainage operation of the control device corresponding to the change of the distribution flow rate by instructing the stop, the control device has a calendar function, a sequencer in which a daily pattern of the distribution flow rate is set in the control device, time and The set value of the water level at that time is input to the sequencer, the water level between the set points and its slope are calculated, and a filter for instructing operation or stop based on the result of comparing the calculated value with the measured value of the water level and its slope. It shall be based on the automatic operation control method of the water machine.

[0005]

According to the present invention, a sequencer is used for a control device.
This is an automatic operation control method for a drainage machine that makes full use of its calendar function. The value of the water level of the reservoir, which should be set as a system, itself is affected by the weather of the day, whether or not it is a holiday, etc., but the shapes of the daily patterns are all similar. Therefore, a daily pattern of the water distribution flow rate is set in the sequencer in advance, and the set value can be easily corrected by an input using the calendar function of the sequencer itself or an input in a weather mode such as fine or rainy. Use a sequencer that can perform numerical comparison and calculate the gradient of change between set points, while determining the gradient of water level change at predetermined time intervals with a water level gauge, so that the difference is within a certain range. To start or stop the drainage machine.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a graph showing an example of the daily pattern of the present invention. In the figure, the daily pattern sets the water holding amount of the reservoir, that is, the reservoir water level that can respond to the change in the daily distribution flow rate.
The set values of the time and the water level are input to the sequencer, such as 1 o'clock -5 m, 14:00 -4 m, and 17:00 -8 m. This daily pattern corresponds to the water distribution flow rate Qout shown in FIG. 2, and the inflows Qr1 to Qr from the drainage machine described with reference to FIG.
3 and a constant inflow Qk from outside. The water distribution flow rate Qout is generally approximated every day, although the pattern may slightly shift up, down, left and right depending on the weather or the day of the week. For the control device, a sequencer capable of performing a numerical comparison operation is used, and the set points are about 6 to 10. When the change gradient (k) between the set points shown in FIG. 1 is obtained, (1) 0 to 5; k1 = 1.6 (2) 5 to 11; k2 = -0.83 (3) 11 to 14; k3 = −0.33 (4) 14 to 17; k4 = 1.33 (5) 17 to 24; k5 = −0.86.

On the other hand, the water level (ht) is measured every fixed time unit (for example, 0.1 hour) by a reservoir water level meter, and the water level change gradient (kt) is calculated by kt = (ht−ho) / t. Ask. Here, ho is the initial value of the water level. Here, as shown in FIGS. 3 and 4, the difference between the measured water level (HM) and the set water level (HS) is equal to or more than a certain value (inclination dead zone α), and k1, k2,. And the measured water level change gradient (k)
If the difference from t) is equal to or greater than a fixed value (inclination dead zone β), the operation time zone of the drainage filter is automatically obtained, and the washing, stopping, and standby processes of the drainage filter are performed during other stop time zones. Set.

The operation time zone is determined as follows.

(1) The set water level HSt at time t is
In the case of the set time zone initial value HSo and the water level gradient kt, the following calculation is performed.

HSt = HSo + kt × (t-to) (2) The measured water level HMt at the time t is compared with the set water level HSt. The result is | HMt-HSt |>
In the case of α, it is determined to be a dead zone.

(3) The measured water level gradient k at the time t
t is compared with the set water level gradient kSt.

If the result is | kt−kSt |> β,
It is determined as a dead zone.

FIG. 4 is an explanatory view showing each of these cases. FIGS. 4A to 4C show that the measured water level HM is equal to the set water level HS.
4 (d) to 4 (f), the measured water level HM is lower than the set water level HS, and the water level gradient tends to widen. , Increase the number of operating drainage machines. Even if the condition is satisfied in the determination of whether or not the water level difference tends to increase according to the above (2) and (3), there is no need to change the operating condition if the water level difference tends to decrease.

This embodiment has the following advantages.

(1) By calculation and comparison, control can be performed so that the deviation does not increase.

(2) By setting the water level of the reservoir as a management target, it is possible to predict the daily flow rate of water distribution, and to predict and control the subsequent deviation from the situation of the water level change until a desired time. Become.

(3) The set value of the water level itself is affected by the weather and the day of the week, but the pattern is similar every day. The set value can be easily corrected by the calendar function of the sequencer itself or an external weather mode.

(4) Not only distribution reservoirs, drainers and equipment but also
When control requiring similar day change modes is required, similar control can be performed by determining the set value and the change gradient.

(5) Since it is based on the operation of the sequencer, it is much cheaper than the method in which copying and simulation are repeated many times.

[0020]

As described above, according to the present invention, it is possible to predict the deviation between the water distribution amount and the inflow amount and control the deviation so that the deviation does not increase.
It is possible to provide an automatic operation control method for a drainage machine that is inexpensive.

[Brief description of the drawings]

FIG. 1 is a graph of an embodiment of a daily pattern according to the present invention.

FIG. 2 is an explanatory diagram of a flow rate of water distribution.

FIG. 3 is a graph of a water level gradient of an example.

FIG. 4 is an explanatory diagram of a water level gradient in the embodiment.

FIG. 5 is a configuration diagram of a water distribution system.

[Explanation of symbols]

51: intake pump, 52: landing well, 53: filtration pump,
54: a filter; 55: a reservoir; 56: a water gauge; 57: a controller.

Claims (1)

(57) [Claims] The present invention relates to a control device for monitoring a water level of a reservoir in which inflow water from a plurality of drainage filters is stored, and instructing a start or stop of each drainage filter to cope with a change in distribution flow rate. In the drainage machine automatic operation control method, the control device includes a sequencer having a calendar function and a daily pattern of water distribution flow rate, and inputs the time and the set value of the water level at that time to the sequencer, and sets the time between the set points. Automatic operation control method of a drainage machine by water level management of a reservoir, which calculates a water level and its gradient, and instructs operation or stop based on a result of comparing the calculated value with a measured value of the water level and its gradient. .