JPS6336526B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a receiving water flow rate management control device for large water supply and middle water supply customers, and its purpose is to provide a suitable device that reliably controls the receiving water flow rate to a management target value without sudden changes. be. In general, in the management of water intake by large consumers of water and medium-sized water supplies, it is important to ensure that the total daily water flow rate, that is, the integrated value of the received water volume, does not exceed the control value and does not fall by a large amount, and that the instantaneous water flow rate is large. It is required to be as constant as possible without any fluctuation.
This is because stable demand is strongly desired, especially since wide fluctuations in flow rate at large customers have a negative impact on the followability of the water supply source, and cause problems such as pressure fluctuations for general small customers. In addition, the fluctuation range of the management target value will also affect the water purification equipment and chemical treatment equipment prepared based on the water distribution plan on the water supply side. In devices that perform such water reception flow rate management, a so-called flow rate control method is usually adopted in which the water reception flow rate value is fed back so that the instantaneous water reception amount becomes a desired flow rate setting value, and the opening and closing of the electric water reception valve is controlled. It has become a thing. However, according to this type of control of the flow rate of received water, for example, control errors are accumulated in the integrated value of the flow rate of received water, so that the integrated value does not match the management value. For this reason, it has generally become necessary to occasionally correct the flow rate set value by monitoring the value of a received water amount integration counter using a flow rate detector that generates a signal in accordance with the received water flow rate. Furthermore, if the cumulative amount of water received in a day exceeds the control value, the electric water receiving valve will be automatically and completely closed by a preset part included in the water receiving amount cumulative counter, for example, and the water receiving amount will be automatically and completely closed for 24 hours per day. Water reception will also be suspended. Here, taking a customer with a control value Q [m ³ ] as an example,
If we try to receive that Q in exactly 24 hours, the flow rate of water received per unit time F [m ³ /H] is (F = Q / 24)
If this is caused by manual operation of the flow rate setting device, a setting error will occur. Now, if we consider the case where the setting error becomes +5%, not only will the water supply burden increase, but the control value Q will be reduced in approximately 22.86 hours.
[m ³ ] will be received, and water will not be received for the remaining time. This results in wide fluctuations in flow rate from (1.05Q/24) [m ³ /H] to 0 [m ³ /H] in 24 hours of receiving water. -5 again
%, the cumulative amount of water received per day is 0.95Q.
[m ³ ], resulting in the waste of the water purification function mentioned above. The present invention has been made in view of the above-mentioned points, and has realized a special device that controls the opening and closing of a water receiving electric valve based on the calculation result of the ratio of remaining time to remaining amount and receiving water flow rate. It is. Figure 1 shows the relationship between the received water flow rate and the received water amount integrated pulse and time, in order to facilitate understanding of the principle of the present invention, and KQ indicates that one pulse is K [m ³ ].
The number of pulses of the management value Q [m ³ ] in one example, T represents the management time. In other words, Fig. 1 shows that the number of pulses is set to (Kg ₀ = 0) at the start time t ₀ and the flow rate of the received water is controlled so that the amount of pulses until the control time T becomes ( _KQ ).
Similarly, at time t2 _, (T-t ₂ ) is changed to (KQ-Kg ₂ ) so that the remaining time becomes (T-t ₁ ) and the remaining pulse amount becomes (KQ-Kg ₁ ). This shows that the water intake should be controlled so that the
In other words, at time t _o, the amount of pulses up to that point is Kg _o
If so, it is sufficient to control the receiving water flow rate so that (T-t _o ) [time] becomes (KQ-Kg _o ) [pulses] so that the remaining pulse amount becomes the remaining pulse amount in the remaining time. For example, (t _o -
By correcting the received water flow rate at each sampling time such as _t2 ) and (T- _t0 ), it is possible to accurately approach the control value Q at the control time T. Fig. 2 shows a control system of an embodiment of the present invention, in which 1 is a water receiving pipe, 2 is a water receiving electric valve, 3 is a water receiving flow meter, 4 is a water receiving amount pulse transmitter, and 5 is a control value setting. 6 is a remaining amount counter, 7 and 7' are hourly pulse generators, 8 is a time pulse generator, 9 is a management time setter, 10 is a remaining time counter, 11 is an OR circuit, and 12 and 12' are digital hold device,
13 is a reference pulse oscillator; 14 and 14' are flip-flops that receive inputs from the set input terminal S and the reset input terminal R; 15 and 15' are timers;
16' is an AND circuit. Further, the operating waveforms of each part of the system shown in FIG. 2 are shown in FIG. In this embodiment, a water receiving pipe 1 is provided with a water receiving motor-operated valve 2 for requesting water and a water receiving flow meter 3 for detecting the receiving water flow rate. It is equipped with a part that controls the receiving water flow rate to open and close the valve. The operation of the apparatus shown in FIG. 2 will be explained in detail with reference to FIG. 3. Here, in order to simplify the explanation, it is assumed that the received water amount signal generated from the received water amount pulse transmitter 4 by the received water flow meter 3 is given K pulses per 1 [m ³ ].
Also, from the control value setting device 5, the control value Q [m ³ ]
Assume that a KQ pulse is given. In the figure, the remaining amount counter 6 having a subtraction counter function inputs the output of the management value setting device 5 and the output of the received water amount pulse transmitter 4, and decrements the count value every time a pulse is sent from the received water amount pulse transmitter 4. In other words, if the flow rate up to a certain time period is _go , the count value will be (KQ- _Kgo ) from the number of pulses _Kgo . On the other hand, the remaining time counter 10, which also has a subtraction function, is given a T pulse from the management time setter 9, and is output from the time pulse generator 8 until a certain time limit is generated.
The remaining time obtained by inputting the to _pulse and subtracting it becomes (T-t _o ). These (T-t _o ), (KQ-Kg _o )
Therefore, the pulse interval (hereinafter referred to as reference pulse) Δt _o
is shown as follows. Δt _o =T-t _o /KQ-Kg _o [time/pulse] ...(1) Therefore, the output pulse of the received water amount pulse transmitter 4 (hereinafter referred to as flow rate pulse) is generated at the same interval as the reference pulse. By controlling the water reception so that the flow rate pulse is given during the reference pulse interval, the control value Q is finally reached at the control time T.
can be accurately approached. In other words, the electric water receiving valve 2 is operated in a corrective manner to slightly close the two flow rate pulses PF ₁ and PF ₂ occurring between the reference pulse PS ₁ and PS ₂ in the example in Fig. 3, and the reference pulse PS ₂ to PS ₃ , since there is only one flow pulse PF ₃ , it can be directly converted from the reference pulse PS ₃ .
Since there is no flow rate pulse in PS ₄ , the electric water receiving valve 2 is operated to open in order to increase the receiving water flow rate. Now, when the output pulse of the OR circuit 11 is input, the digital hold devices 12 and 12' store the outputs of the remaining amount counter 6 and the remaining time counter 10, respectively, and continue to supply the stored values to the OR circuit 1.
By inputting the next output pulse after 1, the outputs of the remaining amount counter 6 and remaining time counter 10 are updated again. Further, the hourly pulse transmitter 7 transmits one pulse every management time, for example, every 24 hours.
The remaining amount counter 6 and the remaining time counter 10 are each reset to zero, and the digital holds 12, 12' are updated and initialized. Therefore, at time t ₀ , the remaining amount counter 6 and digital hold device 12 are set to KQ, and the remaining time counter 10 and digital hold device 12' are set to T.
This will be the case. Furthermore, the hourly pulse oscillator 7' emits one pulse every sampling time as explained in FIG. That is, the digital hold device 12 corrects the digital hold device 12, 12' for each sampling time, _and at time to after the sampling time limit, the digital hold device 12 corrects (KQ- _Kgo ), and the digital hold device 12' corrects (T-t _o) . ) signals will be generated respectively. From this, the reference pulse oscillator 13 calculates (T- _to )/(KQ- _Kgo ), and provides an output pulse, that is, a reference pulse, to the flip-flops 14 and 14' for each value of the result of this calculation. Next, flip-flops 14, 14', timers 15, 15', and AND circuits 16, 16' constitute an opening/closing control portion of the electric water receiving valve 2. Here, the flip-flops 14, 14' are connected to the set input terminal S.
If a pulse is input to , [1] is set, and if a pulse is input to reset input terminal R, it is set to [1].

It shall be reset to [0]. Further, the timers 15 and 15' each have a delay function of generating pulses a little later than the pulse widths of PF ₁ to _{PF 4} and PS ₁ to _{PS 4} as illustrated. To explain the operation of such an opening/closing control part based on FIG. 3, first, the output of the flip-flop ₁₄ is

It is reset to [0] and the flip-flop 14' output is set to [1]. The flip-flop 1
4' output is input to the AND circuit 16' with a delay due to the action of the timer 15', so even if the flow rate pulse PF ₁ of other inputs is generated, the AND circuit 16' calculates the logical product and the output is

It becomes [0]. One AND circuit 16 output is flip-flop 14 output

[0]
from

It becomes [0]. In addition, the flow rate pulse PF ₁ of the output of the received water amount pulse transmitter 4 is given, and the output of the flip-flop 14 is [1] and the output of the flip-flop 14' is

[0], and at the same time, due to the aforementioned delay effect via the timer 15, the output of the AND circuit 16 becomes

[0], and the AND circuit 16' output is

Continue [0]. Next, when the flow rate pulse PF ₂ is given as shown in the figure, since the outputs of the flip-flop 14 and the timer 15 are both [1], the output of the AND circuit 16 is also [1], and the flow rate pulse is
A pulse having a pulse width of PF ₂ is sent out, and on the other hand, the flip-flop 14' is only reset and no pulse is generated from the AND circuit 16'. This causes the water receiving electric valve 2 to be slightly adjusted in the closing direction. Furthermore, when the reference pulse PS ₂ is applied, the output of the flip-flop 14' becomes [1], but since no pulse is sent out from the AND circuit 16' via the timer 15', the electric water receiving valve 2 maintains its opening degree. Furthermore, even if the flow rate pulse PF ₃ is given, the AND circuit 16
does not send out a pulse, and AND circuit 16' also does not generate a pulse. Next, when the reference pulse PS ₃ is given again, the output of the flip-flop 14 becomes

[0], the flip-flop 14' output becomes [1], but the AND circuit 16,
Neither signal 16' generates a pulse. Furthermore, when the reference pulse PS ₄ is given, the flip-flop 14
The output is

It is only reset to [0], and the AND circuit 16 output is

However, since the flip-flop 14' is set to the output [1] by the reference pulse _PS3 , the AND output 16' output is [1].
, and a pulse having the pulse width of the reference pulse PS ₄ is sent out. From this, water receiving electric valve 2
is slightly adjusted in the opening direction. Furthermore, when the flow rate pulse PF ₄ is applied, it is the same as when the above-mentioned flow rate pulse PF ₁ is output. In the opening/closing control of such an electric water receiving valve,
It has the function of correcting and controlling the electric water receiving valve in the closing direction with the output of the water receiving amount pulse transmitter 4 and in the opening direction with the output of the reference pulse transmitter 13, and the flow rate pulse has the same width as the reference pulse. can be taken as a thing. Therefore, the electric water receiving valve operates with minute correction control and does not cause wide fluctuations in flow rate.
Eventually, the control value Q will be reached at the final time T. By using the pulse interval of the hourly pulse oscillator 7', the sampling time is long after the start, and is shortened as the control time approaches, so that more stable and accurate control can be achieved. Furthermore, by programming the control value setter 5 and the control time setter 9, it is also possible to programmatically control the flow rate of the received water using different appropriate control values at different times. Furthermore, each component shown in FIG. 2, such as digital hold devices 12, 12' and reference pulse generator 13
It is easy to configure a portion using a microcomputer, and a portion of such a water reception management control device may be incorporated into a central monitoring and control device that employs a microcomputer. As explained above, according to the present invention, it is possible to provide a device that can reliably control the flow rate of received water to a management target value without suddenly changing it.

[Brief explanation of the drawing]

Figure 1 shows the relationship between received water flow rate and time, Figure 2
3 are a control system diagram and an operation waveform diagram showing an embodiment of the present invention. 2...Water receiving electric valve, 4...Water receiving amount pulse transmitter, 6...Remaining amount counter, 10...Remaining time counter, 12, 12'...Digital hold device,
13... Reference pulse oscillator, 14, 14'... Flip-flop, 15, 15'... Timer, 16,
16'...AND circuit.

Claims (1)

[Scope of Claims] 1. A remaining amount counter that obtains the output of a received water amount transmitter that generates a pulse signal in accordance with the received water flow rate and subtracts it from the management received water amount integrated value, a remaining time counter until the management time, and the remaining Holding means for temporarily storing the values of the quantity counter and the remaining time counter, respectively, and a standard for obtaining the output of the holding means, dividing the value by (remaining time/remaining amount), and generating a pulse interval signal of the value of this calculation result. A receiving water flow rate management control device comprising: a pulse transmitting section; and an opening/closing control section that obtains the outputs of the received water amount transmitting section and the reference pulse transmitting section and sends an opening/closing control signal for a water receiving electric valve. 2. The opening/closing control section is controlled by a delay circuit and a two-input AND circuit that provide a flip-flop output that is set to a high level when a pulse input is input to one input terminal and reset to a low level when a pulse input is input to the other input terminal. The received water amount transmitter output is applied to one input terminal of the first flip-flop and the other input terminal of the second flip-flop, respectively, and The output of the reference pulse generator is applied to one input terminal of the flip-flop, and the output of the delay circuit is applied as one input of a two-input AND circuit.
The received water flow rate management control according to claim 1, wherein the received water amount transmitter output is given to the other of the two-input AND circuit, and the reference pulse transmitter output is given to the other of the second two-input AND circuit. Device.