JP3299373B2 - Water supply control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply control device for controlling the operation of a water supply pump directly connected to a water supply pipe to control water supply to a terminal water supply device.

[0002]

2. Description of the Related Art In a public water supply system, there is insufficient pressure to supply water to a terminal water supply device provided in a building of three stories or more. In such a case, city water drawn from a water distribution pipe is once supplied. A method of storing water in a water receiving tank and increasing the pressure with a pressure pump to supply water to the terminal water supply equipment, or receiving city water from a water distribution pipe to a water receiving tank and using a water pump to a water tank installed at the top of the building A system is used in which water is pumped up and stored, and water is supplied to each terminal water supply device by natural flow.

In any of the above-mentioned methods, once city water is stored in a receiving tank, the residual chlorine gradually decreases. Therefore, if the effective volume of the receiving tank exceeds a certain level, it is subject to the regulation of the Simple Water Supply Law. Safety and health management was required, but maintenance of the receiving tank was very troublesome.
Although small-scale receiving tanks are not subject to laws and regulations, in this case, sanitary problems are likely to occur.

[0004] Therefore, a direct water supply system has been proposed in which a water supply pump is directly connected to a water distribution pipe, and water pressurized by the water supply pump is directly supplied to the terminal water supply equipment. In this method, a water supply pump and a pressure water storage tank are connected in order between the water distribution pipe and the water supply pipe to the terminal water supply equipment, and the pressure water storage tank side is connected to the terminal water supply equipment, and the water supply pump is operated to add water. Is to press.

[0005] If such a direct water supply system is employed, the water receiving tank can be eliminated, so that there is an advantage that the sanitary problem in the water receiving tank does not occur.

[0006]

By the way, in the above configuration, when the pressure on the discharge side is reduced, the water supply pump is operated irrespective of the pressure on the inflow side. By operating and sucking a large amount of water from the water distribution pipe side to supply water, the water pressure of the water distribution pipe to which the water supply pump is connected is reduced. In this case, if the water pressure on the water distribution pipe side is not sufficiently high, there is a problem that poor water discharge or turbid water is generated in the area near the building.

Therefore, a feed water pressurizing apparatus as disclosed in Japanese Patent Application Laid-Open No. 5-263444 has been provided, but in this conventional apparatus, no consideration has been given to the stability of the discharge side pressure at startup. . The present invention has been made in view of the above problems, and an object of the present invention is to provide a water supply control device capable of preventing a rising delay due to a PID calculation at the time of startup and quickly stabilizing a discharge side pressure at the time of startup. To offer.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a water supply pump which is directly connected to a water supply pipe and is provided between a water supply pipe to a terminal water supply apparatus and a water supply pipe. In the water supply control device that performs the operation control of the water supply pump based on the PID calculation so that the discharge-side pressure detected by the pressure sensor detected by the pressure sensor becomes the set pressure, when the water supply pump starts,
A control means is provided for controlling the operation of the water supply pump by canceling the ID calculation, and for controlling the operation based on the PID calculation when the discharge pressure detected by the pressure sensor reaches a predetermined value near the set pressure.

[0009]

According to the present invention, the discharge side pressure detected by the pressure sensor provided on the discharge side of the water supply pump directly connected to the water supply pipe of the water supply system and interposed between the water supply pipe to the terminal water supply equipment and the water distribution pipe is set. In the water supply control device that performs the operation control of the water supply pump based on the PID calculation so as to obtain the pressure, when the water supply pump is started, the PID calculation is canceled to control the operation of the water supply pump, and the discharge pressure detected by the pressure sensor is set. When a predetermined value near the pressure is reached, a control means for controlling the operation based on the PID calculation is provided.
It is not affected by the rise delay of ID calculation.
Therefore, the outflow-side water pressure can be quickly raised to near the target set pressure, and thereafter, the control by the PID calculation is performed, so that stable control can be performed, and as a result, the outflow-side water pressure can be quickly stabilized as a whole. be able to.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a water supply system using one embodiment of the present invention. A water supply control device according to the present invention is provided between a public water supply pipe 1 and a water supply pipe 2 installed in a building B. It is directly connected. One end of the pipe of the water supply control device is connected to the water distribution pipe 1 via the companion flange 3 and the other end is connected to the water supply pipe 2 via the companion flange 3 ', and a double check valve is provided between both ends. Four and three parallel branched pipelines and a flow switch 5 are interposed.

Gate valves 6A and 6B, feed pumps 7A and 7B composed of electric pressurized pumps, check valves 8A and 8B, and gate valves are provided in two of the three parallel branch pipes, respectively. 9A and 9B are interposed, and the remaining one is a check valve 10
Is interposed. The gate valves 6A, 6B, 9A, and 9B are closed when the water supply pumps 7A and 7B are inspected or when a failure occurs, thereby closing the pipeline and enabling the water supply pumps 7A and 7B to be detached.

The check valves 8A and 8B are provided with feed water pumps 7A and 7B.
Is provided on the discharge side of the water supply pumps 7A and 7B to prevent backflow when the water supply pumps 7A and 7B are stopped, so that unnecessary water pressure is not applied to the water supply pumps 7A and 7B when the water supply pumps 7A and 7B are stopped. The pipe in which the check valve 10 is interposed is a bypass pipe, and is used when direct pressure water is supplied when both water supply pumps 7A and 7B are stopped.
This is for preventing backflow of A and 7B from the discharge side.

A line between the double check valve 4 on the inflow side of the water supply pumps 7A and 7B and the companion flange 3 has a pressure sensor 13A for detecting the water pressure _PIN on the inflow side, and an air exhaust solenoid valve 26. , A full air detector 25. On the other hand, a pressure storage tank 11 and a pressure sensor for detecting the water pressure Pd on the discharge side of the water supply pumps 7A and 7B are provided in a pipeline between the flow switch 5 on the discharge side of the water supply pumps 7A and 7B and the companion flange 3 '. 13B and a flow sensor 12 are provided.

The pressure storage tank 11 is provided with water supply pumps 7A, 7
This is for smoothing the water supply pressure by storing the water discharged from B in a predetermined pressure state. The operation of the water supply pumps 7A and 7B is controlled by a control unit 14 surrounded by a broken line in FIG. The control unit 14 connects the inverter devices 15A and 15B that output the variable frequency and the variable voltage to the water supply pumps 7A and 7A.
7B, the thermal relays 16A, 16B.
A drive voltage is applied to each of the water supply pumps 7A and 7B via B.

The output frequencies of the inverter devices 15A and 15B are controlled through an output circuit 19 by a central processing unit 18 using a microcomputer.
The feed pumps 7A and 7B are operated at a speed corresponding to the output frequencies and voltages of the 5A and 15B. Inverter device 1A, 1
The input power of B is supplied with power through the switching contacts of the earth leakage breakers 21A and 21B and the switching contacts of the electromagnetic switches 20A and 20B, and the opening and closing control of the electromagnetic switches 20A and 20B is performed by the central processing unit 18 through the output circuit 19. .

The air discharge solenoid valve 26 is driven to open by receiving a control signal of the central processing unit 18 through the output circuit 19 when the filled air detector 25 detects that the pipe is filled with air over a certain amount. The air in the pipeline is exhausted to the atmosphere. The central processing unit 18 includes detection signals a and b of the pressure sensors 13A and 13B taken in through the input circuit 22, operation signals c and d of thermoswitches (not shown) provided in the water supply pumps 7A and 7B, and a flow rate switch. 5, and the thermal relays 16A, 1
6B, the inverters 15A,
The control processing corresponding to the failure detection signals g, g ′ of 15B, the detection signal h of the flow rate sensor 12, and the detection signal i of the filled air detector 25 is performed. I do.

Further, it has a function of performing an operation input process and a display control process of an operation display unit 24 provided on a control panel in which the control unit 14 is housed. The operation display unit 24 is provided on the front surface of the control panel, and as shown in FIG. 2, a power supply display lamp 31, a pump stop display lamp 32, and each water supply pump 7
Indicator lamps 33A and 33B provided corresponding to A and 7B to indicate the respective operation, failure indicator lamps 34A and 34B for indicating a failure of each water supply pump 7A and 7B, and during pump stop due to a decrease in inflow side pressure. , A display lamp 35 that blinks, a display lamp 36 that blinks when the inflow-side pressure is lower than a starting reference value described later, and the control operation is being performed by the sub-set pressure, and a filled air detector 25 that detects air. A water supply pump 7A or 7B that is detected and running is stopped, an air discharge solenoid valve 26 is operated, and a display lamp 37 that flashes during exhaust is provided.
a and a main unit changeover switch SWb.

Each of the switches SWa and SWb is composed of a triple push button switch. When one push button switch is operated, the other push button switches are mechanically reset. Test, Off
When "test" is selected and the pump operating conditions are met when "test" is selected, the operation selected by the main engine switch SWb is output and "off" is selected. In this case, the operation of both pumps 7A and 7B is prohibited, and when "automatic" is selected, if the pump operating conditions are met, the operation of the water supply pump 7A or 7B selected by the main engine switch SWb is output. When none of the modes is selected, the operation mode is “OFF”.

The main unit changeover switch SWb is provided with a feed water pump 7A.
"No1", "self-association", and water supply pump 7B corresponding to
"No2" can be selected, corresponding to "
Is selected, the operation of the water supply pumps 7A and 7B is alternately switched every time. When a failure occurs during the operation of the pump, a backup for switching the operation to the other pump is performed. During continuous operation during setting, automatic switching operation by the forced switching function becomes possible, and furthermore, during parallel operation setting, simultaneous operation of two units becomes possible. When one of “No1” and “No2” is selected, operation is possible only on the selected side.

In order to indicate the selected state of the switches SWa and SWb, display lamps L _{1 to} L ₆ are provided so as to be provided along with the respective push buttons, so that the selected state is displayed. Both switches SWa and SW of the operation display unit 24
The operation state b is taken as an operation command into the central processing unit 18 of the control unit 14 via a signal line in the panel. The lighting of each of the display lamps 32 to 35 and L _{1 to} L ₆ is controlled by a control signal transmitted from the central processing unit 18 of the control unit 14 through a signal line.

The operation display device 23 is provided on the surface of the main body case 44 of the control unit 14 as shown in FIG. 3, and has four 7-segment numerical symbol display LEDs for displaying numerical symbols.
A display 37 provided with digits, and display lamps 38 ₁ , 38 ₂ , 39 ₁ , 39 ₂ , 40, 41 for monitoring and displaying an operation state.
_1, and 41 _2, the pushbutton switch 42 for the display switching for performing the changing operation switching and setting data of the display contents of the display 37, the reset pushbutton switch 43, and a parallel operation setting alone operation setting described above And a display 40, a display lamp 38 ₁ , 38 ₂ , 3
The control of 9 ₁ , 39 ₂ , 40, 41 ₁ , and 41 ₂ is performed by the central processing unit 18, and the central processing unit 18 controls the display of the display 37 in accordance with the operation of the push button switch 42, and supplies the water feed pumps 7 A and 7 B. The setting data relating to the operation control is taken in and stored in, for example, an EEPROM 45 (for example, another storage device such as a magnetic card or a memory card).

When the reset push button switch 43 is operated, the central processing unit 18 cancels the fault information stored in the event of a pump fault and the fault processing state. Even if the switch 43 is operated, the operation continues normally. The reset push button switch 43 can simultaneously reset the failure states of both pumps 7A and 7B.

Further, when the power is turned on when the switch 40 is set to the independent operation side, the central processing unit 18 performs the set operation, and performs a continuous operation forcible switching function to be described later. Except when 7A and 7B are operated simultaneously, one water supply pump is operated to control the water pressure. When the power is turned on in the case where the parallel operation is set, when the power is turned on, the set operation is performed, and when the operation of any of the water supply pumps 7A or 7B is controlled, the detection value of the discharge side pressure sensor 13B is set to a target setting described later. When the state below the pressure SV continues for a predetermined time, the other water supply pump 7
B or 7A is operated in parallel. At this time, the operation of the other water supply pump 7B or 7A is stopped when a value equal to or more than a predetermined value from the target set pressure SV continues for a predetermined time while the other water supply pump 7B or 7A is operated at the minimum output.

Next, the operation of this embodiment will be described below. The user uses the push button switch 42 to set the EEPROM 4
5 is a state in which various setting data necessary for operation control of the water supply pumps 7A and 7B such as a main setting value MAIN for determining the discharge side target setting pressure SV and various reference values Ps ₁ and Ps ₂ are set in advance.
When the power is turned on, the control unit 14 is controlled based on the power-on.
In this embodiment, power is supplied to each unit from a power supply unit (not shown), and first, the central processing unit 18 performs an initial process as shown in FIG. In this case, the in-panel transmission for monitoring and controlling the operation display unit 24, the processing at the time of failure, and the monitoring and control of the operation display device 23 are repeatedly performed until, for example, 930 ms elapses. Subroutine processing of D input processing, PID control, stop control, parallel operation control, forced switching control, pump failure processing, forced start control, and air discharge control is performed.

In the in-panel transmission, the state of each of the switches SWa and SWb of the operation display unit 24 is checked, and a signal for controlling the lighting of the display lamps L _{1 to} L _{6 and} the lighting of each of the display lamps 32 to 36 are controlled. Display the signal on the operation display unit 24
Send to In the process at the time of failure, the operation signals c and d of the thermoswitches (not shown), the operation signals f and f 'of the thermal relays 16A and 16B, and the failure detection switches of the inverter devices 15A and 15B (FIG. (Not shown) via the input circuit 22 and, when it is determined that a failure has occurred, a countermeasure process is performed.
Further, in the monitoring control of the operation display device 23, the monitor detection corresponding to the failure detection, the check at the time of transmission in the panel, and the monitoring of the switch input are performed.

If each part is normal and the operation mode switch SWa is set to the "OFF" state, none of the water supply pumps 7A and 7B is operated, and the display lamp 32 is turned on. The display lamps 32 to 36 of the operation display device 24 are also turned off. At the time of initial processing, the central processing unit 18 sets a main setting value MAIN written in a preset EEPROM 45 to a sub setting value SUB to be described later.

Next, when the operation mode switch SWa is set to, for example, "automatic" and the main engine changeover switch SWb is set to "self-exchange", the central processing unit 18
In the in-panel transmission, these states are read and operation control of the water supply pumps 7A and 7B is started. At this time, when the value of the inflow side pressure P _IN detected by the pressure sensor 13A exceeds the discharge side target set pressure SV by a certain value or more, or when the flow rate switch 5
Is turned off, and it is determined whether or not the operation of the water supply pumps 7A and 7B is not required as in the case where the amount of water supplied to the terminal water supply device 50 is equal to or less than a certain value. For example, the electromagnetic switch 20A corresponding to the inverter 15A driven by the water supply pump 7A is turned on.

The reason why the electromagnetic switch 20A (20B) is used is to reduce the power consumption of the inverter device 15A (15B). When the water supply pump 7A (7B) needs to be operated, the central processing unit 18 uses the electromagnetic switch 20A (20B). As shown in FIG. 5A, the electromagnetic switch 20A (20B) through the output circuit 19
Is closed, and an input power supply is connected to the inverter device 15A (15B).
A signal for controlling the output frequency and output voltage is given to (15B) as an operation command. In order to stop the operation of the water supply pump 7A (7B), the inverter device 15A (15B)
The central processing unit 18 first gives an instruction to turn off the output to the inverter device 15A (15B) as shown in FIG.
After the operation of (15B) is stopped, the electromagnetic switch 20A (2
0B) is opened, and the input power to the inverter device 15A (15B) is cut off.

When the inverter device 15A operates and the operation control of the feed water pump 7A is started, the central processing unit 18 executes a main setting value MA in a subroutine of PID control.
The output frequency and output voltage of the inverter 15A are controlled so that the detected pressure of the pressure sensor 13B, that is, the discharge side pressure Pd, becomes equal to the target set pressure SV in which IN is set. By the way, when the output-side pressure shifts from the output-off state to the output-on state, such as at the time of startup, if the discharge side pressure Pd is lower or higher than the target set pressure SV, control by PID calculation is performed immediately. Since it takes time to reach SV, it is first determined whether the discharge side pressure Pd is larger than the maximum target set pressure SV + α or smaller than the minimum target set pressure Psv−β, as shown in the flowchart of FIG.

First, the discharge side pressure Pd is set to the maximum target set pressure SV.
When the pressure is larger than + α, the pump operation is not required. Therefore, the output is set to 0 (0 in the embodiment, but it is of course possible to be close to 0, and it is not particularly limited to 0), the pump operation is stopped, and the control by the PID calculation is stopped. State. When the discharge side pressure Pd is the minimum target set pressure SV-β, the central processing unit 18 sends 100
% (In the embodiment, the output frequency is set to 100%, but the output frequency and the voltage corresponding to the output of about 100% or of any other magnitude are not particularly limited).
Stop control of the calculation. At this time, the discharge side pressure Pd rapidly rises toward the target set pressure SV as shown in FIG.
In this way, when control by the PID calculation is stopped, PI
Turn off the D flag. If the discharge side pressure Pd is in the range from the minimum target set pressure SV-β to the maximum target set pressure Psv + α, control by PID calculation becomes possible and the PID flag is turned on. Thereafter, when the output is on, the PID flag is checked. If the PID flag is on as described above, the control by PID calculation is performed. If the PID flag is off, the discharge side pressure Pd becomes the minimum target set pressure SV-β. The above processing is repeated until the pressure falls within the range of the maximum target set pressure Psv + α. When the PID control is performed, the inverter device 15A
To operate the water supply pump 7A so that the discharge side pressure Pd of the water supply pump 7A converges to the target set pressure SV.

As described above, the discharge side pressure Pd of the feed water pump 7A is controlled to the target set pressure S
V is controlled. Here, the target set pressure S
V is varied according to the pressure value of the inflow-side pressure _PIN detected by the pressure sensor 17A. FIG. 8 is a flowchart showing the setting of the target set pressure SV.

In this case, in order to prevent the water pressure in the water distribution pipe 1 from decreasing and affecting the water supply to other buildings, the inflow side pressure P
The start reference value Ps ₁ of _IN is determined, and the central processing unit 18
Compares the inlet pressure P _IN with the starting reference value Ps ₁ ,
The sub-set value SUB is added to the target set pressure SV according to the comparison result.
Is set. That is, the central processing unit 18 sets the main set value MAIN to the sub set value SUB (SUB = MAIN) at the first operation start (cold start) after the power is turned on as shown in FIG. If it is not the first operation start, E
The final sub-setting value M written and stored in the EPROM 45 is set to the sub-setting value SUB (SUB = M).

Next, the inflow side pressure P _IN becomes equal to the start reference value Ps _1.
If beyond, the timer value T ₁ by substituting 0, is compared with the predetermined time Ts ₁ (> 0). Naturally, since T ₁ <Ts _1, it is next determined whether or not the sub set value SUB is set to the target set pressure SV and the operation is performed. In this case, since the operation is performed with the main set value MAIN, the sub set value S
The process jumps to the process of determining whether or not the value of UB is equal to or greater than the main set value MAIN (SUB> MAIN). In this case, since the main setting value MAIN is set to the sub setting value SUB as described above, the current sub setting value SUB is set to the EE as the final sub setting value M.
The data is written and stored in the PROM 45.

[0034] Although while this way the inflow side pressure P _IN exceeds the start reference value Ps ₁ is performed by repeating the above processing, if the inlet-side pressure P _IN is starting reference value Ps ₁ below adds a predetermined time [Delta] T ₁ timer value T _1, and repeatedly performs the above processing timer value T ₁ is to over the predetermined time Ts _1. That predetermined time Ts ₁ or more inflow side pressure P
Monitors whether _IN continues to start reference value Ps ₁ below, whether or not based on the target set pressure SV the current control operation at the time exceeds a predetermined time Ts ₁ is set in the main setting value MAIN judge. Here, since the value is based on the target set pressure SV set to the main set value MAIN, the central processing unit 18 sets the sub set value SUB to the target set pressure SV (SV = SUB) and sets the timer value T _1. Is reset to 0.

Then, the sub set value SU is added to the target set value SV.
Since B is set, the return reference value Ps
₂ (Ps ₁ is set to a higher value) is compared with the inflow side pressure P _IN. Here, when the inflow side pressure P _IN becomes larger than the return reference value Ps ₂ , the timer value T ₂ is set to a certain time Δ
By adding T ₂ is repeated until it exceeds a predetermined time Ts ₂ of the above process. That is, it is monitored whether or not the time during which the inflow side pressure P _IN exceeds the start reference value Ps ₁ and exceeds the return reference value Ps ₂ continues until the predetermined time Ts ₂ is exceeded.
If it continues until the predetermined time Ts ₂ is exceeded, a constant value ΔSUB ₂ is added to the current sub-setting value SUB, the sub-setting value SUB is set (SUB = SUB + ΔSUB ₂ ), and the timer value T ₂ is reset to 0. I do. Then, the newly set sub-setting value SUB is compared with the main setting value MAIN. When the sub-setting value SUB exceeds the main setting value MAIN, the main setting value is set as the sub-setting value SUB as in the initial state. MAIN is set (SUB = MAIN), the main set value MAIN is set to the target set pressure SV (SV = MAIN), and the final sub set value M is set.
And stores the current sub-setting value SUB in the EEPROM 45. If the sub set value SUB does not exceed the main set value MAIN in the above, the sub set value SUB is set to E
The data is written and stored in the EPROM 45. In the process where the inflow side pressure P _IN rises beyond the return reference value Ps ₂ , the sub set value SUB is added by ΔSUB ₂ every time the fixed time Ts ₂ elapses until the sub set value SUB exceeds the main set value MAIN. It is variable.

In this embodiment, as described above, the return reference value Ps ₂ is configured to also serve as the ascending reference value, and is not distinguished. In this case, the condition that the rising reference value is not more than the return reference value and not less than the below-described falling reference value is a condition. On the other hand, the inlet pressure P _IN
There when continues remain start reference value Ps ₁ or less,
Every time the fixed time Ts ₁ elapses, a constant value ΔSUB ₁ is subtracted from the current sub-setting value SUB and set to the sub-setting value SUB (S
UB = SUB−ΔSUB ₁ ), and the sub-setting value SUB is varied.

In this embodiment, as described above, the start reference value Ps ₁ also serves as a descending reference value, and is not distinguished, but may be clearly divided. In this case, the lowering reference value must be lower than the return reference value and lower than the raising reference value. The changed sub-setting value SUB is compared with the main setting value MAIN, and is updated and stored in the EEPROM 45 as the final sub-setting value M each time.

When the inflow-side pressure _PIN continues to decrease, the sub-set value SUB is not set to be lower than the predetermined minimum sub-set value. In the above flowchart, when the predetermined time Ts ₂ to 0, the inflow side pressure P _IN is increased reference value (release reference value Ps ₂₎
Is exceeded, the sub-setting value SUB is increased stepwise by ΔSUB.

[0039] In the above flowchart, when the predetermined time Ts ₁ to 0, the inflow side pressure P _IN is falling reference value (start reference value Ps ₁₎ below becomes if the sub setting value SUB
Is stepwise decreased by ΔSUB. By the way, in the operation shown in the flowchart, the inflow side pressure P _IN
Sub setting value when adding the constant value ΔSUB to SUB, time inflow side pressure P _IN exceeds rise reference value (release reference value Ps ₂₎ when but it exceeds rise reference value (release reference value Ps ₂₎ Is required to continue for a predetermined time Ts _2, but if the number of times the inflow-side pressure P _IN exceeds the second reference value Ps ₂ is counted and continues for a certain value or more, the sub-setting value S
The constant value ΔSUB may be added to UB.

FIG. 9 is a flowchart showing this operation.
(Replaced with the flowchart in the frame enclosed by the broken line in FIG. 8
In this case, first, the value of the sub-setting value SUB is checked.
When the target set pressure SV is set and the operation is performed,
First, the previous inlet pressure P_INIs the old pressure P_INOLD and this time
Inlet pressure P_INTo P_INNEW. And the old pressure P _IN
OLD is the rising reference value (return reference value Ps_Two) Set lower
Reference value Ps_Two'And the current pressure P_INNEW rises
Reference value (return reference value Ps_Two)
If YES, add 1 to the count value N and NO
If there is, the count value N is reset to 0, and the count value N becomes
When it becomes larger than the predetermined value Ns, it is fixed to the sub-setting value SUB.
The value ΔSUB is added, and the count value N is reset.

Further, the sub-steps are changed stepwise according to the change of the inlet pressure.
FIG. 1 shows a method of converting the set value SUB step by step.
0 may be used. in this case,
Inlet pressure P_INIs the starting reference value Ps₁If
Reference value Ps₁′, The inlet pressure P_INIs high
In this case, the first sub-set value SUB is set to the target set pressure SV. ₁
Set (SV = SUB₁). The reference value Ps₁’
If lower, the next reference value Ps_Two’
More inflow side pressure P_INIs higher than the target set pressure SV,
Second sub-setting value SUB_TwoSet (SV = SUB_Two)
You.

In this manner, the reference value to be compared is sequentially switched from Ps ₁ to Psn ′ according to the inflow side pressure P _IN , and the corresponding sub-set values SUB ₁ .
Set as the value of V. On the other hand the inflow side pressure P _IN is restored, beyond the start reference value Ps _1, the target set if the starting reference value Ps ₁ or more release reference value Ps ₂ that is set to exceed the predetermined time Ts ₁ continued The value of the main set value MAIN is set to the pressure SV (SV = MAIN). When the sub set value SUB is set to the target set pressure SV, the central processing unit 18 notifies the outside through the transfer circuit 51, and when the main set value MAIN is set to the target set pressure SV, the shift is performed. The output of the notification circuit 51 is turned off.

FIG. 11 shows the above operation. Further, in this way, the inflow side pressure P _IN is compared with the respective reference values Psn ′, and when the inflow side pressure P _IN exceeds the compared respective reference values Psn ′, the corresponding sub-set values SUBn are set. However, when the inflow-side pressure P _IN falls below the minimum reference value Psn ′, the lowest sub-setting value SUBn + ₁ is set.

When the operation of the water supply pump 7A or 7B is controlled as described above, the central processing unit 18 always sets the abnormal water pressure Pz ₁ at a value lower than the target set pressure SV by a certain value. As shown in the flow chart of FIG. 12, this abnormal water pressure Pz ₁ changes its value, such as Pz ₁ , Pz ₂ ′, every time the set value of the target set pressure SV changes. The central processing unit 18 is the discharge pressure Pd that is detected by the discharge-side pressure sensor 13B is monitoring whether lower than the abnormal pressure Pz _1.

That is, the pressure is detected by the discharge side pressure sensor 13B.
The discharge side pressure Pd is abnormal water pressure Pz ₁Below, Thailand
Ma value T₁To ΔT₁Increase the value at a specified time.
Between Tz₁Turns on the abnormal signal output when it exceeds. at the same time
Determine whether parallel operation is possible and determine if parallel operation is not possible
Start the operation control of the currently stopped feed pump,
Timer value T₁Is reset to 0. After this reset,
Stop the operation control of the feedwater pump that has been operating from before.
The central processing unit 18 sets this state as a reset pushbutton switch.
43 is turned on or the power is reset.
Until it is reset.
Turn off the signal output and return to the initial state.

When the parallel operation is possible, the output of the feed water pump 7A or 7B that is currently operating is set to 100% (in the embodiment, it is set to 100%, but it may be close to 100%). Feed pump 7B or 7A that controls inverter device 15A or 15B and is currently stopped
Operation control by the PID calculation of
Reset ₁ to 0. Or central processing unit 18 thereafter compares the second and abnormal pressure Pz ₂ the pressure sensor is set on the discharge side pressure Pd and the abnormal pressure Pz ₁ or more to detect the discharge pressure Pd exceeds the abnormal pressure Pz ₂ Monitor whether
If it exceeds, add ΔT ₂ to the timer value T ₂ , and when the timer value T ₂ exceeds the predetermined time Tz ₂ , stop the operation control of the water pump on the side that started operation later, and the water supply pump is operated controlled by a PID operation, turns off the abnormal signal output resets the timer value T ₂ to 0.

In this way, the value of the abnormal water pressure Pz ₁ is automatically made to follow the change of the target set pressure SV, and the operation of the stopped water supply pump is automatically controlled even if a water supply abnormality occurs. , To eliminate water supply abnormalities and secure a stable water supply. By the way, as described above, the water supply pump 7A or 7
During the operation control of B, when the use of water on the end water supply device 50 side decreases and the flow rate becomes a certain amount or less, the flow switch 5 is turned off. When the flow switch 5 is turned off, the central processing unit 18 receives the off signal e, gives an operation stop command to the operating inverter device 15A or 15B, and stops the operation of the feedwater pump 7A or 7B. In this case, a check valve 9 is provided on the water supply pump 7A, 7B side.
Since the check valve 10 is provided in the A, 9B and the bypass pipe, the pressure on the pressure storage tank 11 side is not released to the water distribution pipe 1 side and the discharge side is maintained even after the operation of the water supply pump 7A or 7B is stopped. The pressure Pd maintains the target set pressure SV. Therefore, after the operation of the water supply pumps 7A or 7B is stopped, the pressure is gradually released, and the water supply pumps 7A and 7B are not repeatedly operated, and wasteful power consumption can be eliminated.
Further, the steep water pressure fluctuation at the time when the pump is stopped can be absorbed by the pressure water storage tank 11 to prevent the equipment from being damaged by the water hammer phenomenon.

When the operation of the pump is stopped after the flow rate switch 5 has been kept off for a certain period of time,
It is possible to prevent the flow switch 5 from rattling due to chattering or the like. If the discharge-side pressure Pd detected by the pressure sensor 13B falls below the target set pressure SV in the state where the pump operation is stopped, the stop by the flow rate switch 5 is released and the pump can be operated. For example, the central processing unit 18 closes the electromagnetic switch 20A or 20B so as to start the water supply pump 7A or 7B, and gives an operation command to the inverter 15A or 15B.

The central processing unit 18 counts the driving time of one of the water feed pumps 7A or 7B in operation during the operation control, and as shown in FIG.
If a exceeds the predetermined time Tb, the other water supply pump 7
Inverter 1 to switch operation to B or 7A
5A, 15B, and the timer value Ta
Reset. Of course, the timer value Ta is the same for both pumps 7A, 7
If both B are stopped, they are reset.

When the operation of the two pumps 7A and 7B is switched, as shown in the flow chart of FIG. 14, first, before stopping the running water supply pump 7A or 7B, the inverter for the stopped water supply pump 7B or 7A is operated. Device 13A
Alternatively, an operation command may be given to 13B to operate the water supply pump 7B or 7A to set the simultaneous operation period, and then, after a process in which both outputs become the same, the operation of the water supply pump 7A may be stopped. .

As for this method, specifically, FIG.
After the stop-side pump is turned on as shown in the flowchart of FIG.
Second, 50 seconds), the output of the previously operated pump is decreased stepwise such as 1/2, 1/4, 1/8 of the target set pressure SV, and the operation is performed later with this decrease. There is a method in which the output of the pump that has been started is increased, and the pump that has been operating earlier is stopped when, for example, 60 seconds have elapsed.

Alternatively, when the processing of the flowchart shown in FIG. 16 is performed in place of the processing after the same output processing of the two pumps in FIG. 14, a certain period of time from the time when both pumps are synchronized after the simultaneous operation of the two pumps is started. After Ts, the pump that has been operating earlier is stopped, and smooth operation switching can be performed. By the way, during automatic operation, the water supply pump 7A,
When 7B is stopped, the central processing unit 18 counts the stop time Tx based on the flowchart of FIG. 17, and for a predetermined time Txs (for example, 6 hours) or more, forcibly activates the operable water supply pump 7A or 7B. The operation is controlled for a predetermined time Ty (for example, about 30 seconds). During this operation control, it is monitored whether the discharge side pressure Pd is normal, that is, whether the discharge side pressure Pd is increasing or the pressure difference with the inflow side pressure _PIN is increasing, and the thermal relay 16A or 16B is monitored. It is monitored whether or not an abnormality occurs by monitoring, for example, the discharge side pressure Pd becomes abnormal,
Alternatively, when an abnormality occurs in the feedwater pump 7A or 7B during the operation control, the operation control is stopped, and the transfer circuit 51 is turned on. This operation is an operation for stirring the water staying in the pipeline to prevent the water quality from deteriorating, and for confirming the operation of the water supply pump 7A or 7B.

As shown in the flowchart of FIG. 18, the operation control may be stopped when the discharge side pressure Pd exceeds a predetermined value Px instead of counting the predetermined time Ty. Also, as shown in the flowchart of FIG.
In FIG. 18, the water supply pump 7A or 7B is forcibly turned on and the time Tx 'until the discharge pressure Pd reaches the predetermined value Px is measured and compared with a fixed time Txs'. May be ensured.

Further, the state in which the discharge side pressure Pd exceeds the predetermined value Px is determined by the time T as shown in the flowchart of FIG.
x 'is counted, and the operation control is continuously performed until the time Tx' reaches a certain time Txs', and further normality of the discharge side pressure Pd and normal input of the thermal relays 16A and 16B are further confirmed. 'You may stop later.

In this embodiment, the other control is that the pump operation is inhibited when the inflow side pressure P _IN is lower than the preset low pressure cut value for a predetermined time, and the operation display section is operated. At 23, there is a control for displaying a decrease in the inflow pressure. When the inflow side pressure P _IN continues to be a high pressure cut value that is set higher than the main set value MAIN by a certain value for a certain period of time, control is performed to inhibit the pump operation as in the low pressure cut. Then, if the inflow-side pressure P _IN decreases and becomes a state lower than the main set value MAIN by a certain value, and if the pump operation is possible, control for restarting the pump operation is performed.

The flow sensor 12 is used for calculating and setting the target set pressure SV using the detected value. However, the operation using the flow sensor 12 is not particularly related to the present invention, and the description is omitted. . Further, in the present embodiment, the central processing unit 18 determines and sets the data necessary for the pump control and the switching of the display based on the time of the pressing operation of the push button switch 42 of the operation display device 23.
1 is a flowchart showing the processing operation of the central processing unit 18. That is, the central processing unit 18 monitors the switch input at regular time intervals as shown in the flowchart of FIG. 4. The operation state of the current state is stored in a variable called SW, and it is determined whether or not the push button switch 42 is pressed in accordance with the contents of each variable. If there is a push operation of the push button switch 42 in the current cycle, the timer value T is set. Constant value ΔT
If the push button switch 42 is not pressed in the current cycle and the push button switch 42 is pressed in the previous cycle, the value of the timer value T is put in the operation timer value T _IN . If the last cycle, push button switch 42
If there is no push operation, the timer value T is reset to 0 and the operation timer value T _IN is reset to 0. If the operation timer value T _IN is greater than 0 and within a predetermined time Ts, the write flag is turned on, the data DD currently displayed on the display 37 is written and stored in the EEPROM 45, and the set data of the displayed item is stored. I do. After this setting, the write flag is turned off, the display item on the display 37 is switched to the next display item, and the current data DD is stored in the work variable Temp.

After the operation timer value T _IN is out of the range of 0 to the fixed time Ts or after the current data DD is stored in the work variable Temp, the operation timer value T _IN becomes the predetermined time Ts.
It is determined whether or not the count value is equal to or more than a predetermined time Ts.
Is greater than a predetermined value Ns, and if not, the value of the data DD is changed to the current DD by a fixed value ΔD.
Set to the value obtained by adding D.

If the count value N exceeds the predetermined value Ns, the value of the data DD is changed to the current DD by a fixed value ΔDD.
× Ns. That is, the change in the value of the display data becomes Ns times, and high-speed display is achieved. The operation timer value T _IN is a predetermined time T
It is determined whether s is small or after the content of the data DD is updated, whether or not the content of the work variable Temp matches the current data DD. If not, the write flag is turned on. After the switch is turned on, or when they match, the system waits until the next switch input cycle.

In this manner, the display items can be switched and the displayed data DD can be stored as setting data by pressing the push button switch 42 for a short time, and displayed by a long pressing operation. The data DD can be changed, and the user can change the display operation time, change the display data DD, and store the display data DD as setting data by changing the pressing operation time of one push button switch 42. You can do it.

By inserting the processing of the flowchart shown in FIG. 22 at the point Y in FIG. 21 to automatically turn off the display 37, energy can be saved. That is, in the case of FIG.
In the state where the display item of the display 37 is not blank,
When there is no pressing operation of the push button switch 42, the timer value T
When the timer value Tc exceeds a certain time (for example, 5 minutes), the central processing unit 18 turns off the display 37 to blank the display item and sets the timer value Tc to 0. Reset it.

[0061]

According to the present invention, a discharge side pressure detected by a pressure sensor provided on a discharge side of a water supply pump directly connected to a water supply pipe of a water supply system and interposed between the water supply pipe to the terminal water supply equipment and the water distribution pipe is set. In the water supply control device that performs the operation control of the water supply pump based on the PID calculation so as to obtain the pressure, when the water supply pump is started, the PID calculation is canceled to control the operation of the water supply pump, and the discharge pressure detected by the pressure sensor is set. When a predetermined value near the pressure is reached, a control means for controlling the operation based on the PID calculation is provided.
It is not affected by the rise delay of ID calculation.
Therefore, the outflow-side water pressure can be quickly raised to near the target set pressure, and thereafter, the control by the PID calculation is performed, so that stable control can be performed, and as a result, the outflow-side water pressure can be quickly stabilized as a whole. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a water supply control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an operation display unit according to the embodiment.

FIG. 3 is a front view of a controller main body showing the operation display device according to the first embodiment;

FIG. 4 is a basic flowchart of the above.

FIG. 5 is a flowchart showing a control process of the electromagnetic switch of the above.

FIG. 6 is a flowchart showing PID control processing according to the first embodiment;

FIG. 7 is an explanatory diagram showing a change state of a discharge-side pressure before a PID control according to the first embodiment.

FIG. 8 is a flowchart illustrating an example of a sub-setting value changing process according to the first embodiment.

FIG. 9 is a flowchart showing a main part of another example of the variable processing of the sub-setting value according to the embodiment.

FIG. 10 is a flowchart showing another example of the sub-setting value changing process according to the first embodiment.

FIG. 11 is an explanatory diagram showing a change state of an inflow-side water pressure in another example of the above.

FIG. 12 is a flowchart showing a control process performed when the pump fails.

FIG. 13 is a flowchart showing a process of a forced switching control according to the third embodiment.

FIG. 14 is a flowchart showing a process of another example of the forced switching control according to the embodiment.

FIG. 15 is a flowchart showing a process of another example of the forced switching control according to the embodiment.

FIG. 16 is a flowchart showing a process of another example of the forced switching control according to the embodiment.

FIG. 17 is a flowchart showing a process of a forced start control according to the embodiment.

FIG. 18 is a flowchart illustrating a process of another example of the forced start control according to the embodiment.

FIG. 19 is a flowchart showing a process of another example of the forced start control according to the embodiment.

FIG. 20 is a flowchart showing a process of another example of the forced start control according to the embodiment.

FIG. 21 is a flowchart showing a data setting process of the embodiment.

FIG. 22 is a flowchart of a power saving process of a display of the operation display device of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water distribution pipe 2 Water supply pipe 7A, 7B Water supply pump 13A, 13B Pressure sensor 15A, 15B Inverter 18 Central processing unit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E03B 11/16 E03B 7/00 E03B 5/00 F04D 15/00

Claims (1)

(57) [Claims] A discharge pressure detected by a pressure sensor provided on a discharge side of a water supply pump which is directly connected to a water supply pipe of a water supply system and is interposed between a water supply pipe to a terminal water supply device and a water distribution pipe is set to a set pressure. In the water supply control device that performs the operation control of the water supply pump based on the PID calculation, when the water supply pump is started, P
Control means for controlling the operation of the water supply pump by canceling the ID calculation and performing operation control based on the PID calculation when the discharge pressure detected by the pressure sensor reaches a predetermined value near the set pressure. Water supply control device.