JPH04143474A - Control method for operation of automatic water supply device - Google Patents

Abstract

PURPOSE:To sense any failure in the pump operating condition and make necessary protection and notification by performing. besides normal operating control, taking-in of the pressure information as a state parameter of a pump part together with a signal given by a motor condition sensing means, and using the information to conditions for failure sensing and protection. CONSTITUTION:A pressure sensor 7 and a pressure tank 8 are furnished in a discharge pipe 5 of a pump 5, and signals from this pressure sensor 7 are fed to an instructive controller 11 of a control part 9. A power sensor 10 of the control part 9 senses the power of a motor 1a and gives an appropriate signal to the instructive controller 11. This instructive controller 11 is composed of a pressure judging part 11a to perform the operational control processing upon comparing the signal from the pressure sensor 7 with various preset control values for operational motions, a condition judging part 11b to judge the motor condition upon comparing the signal from the power sensor 10 with the condition setting value, and a locational part 11c to control the operating sequence of the pump 1. Signals from the instructive controller 11 are fed to the motor 1a.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for controlling the operation of an automatic water supply device.

[Conventional technology]

Conventional automatic water supply devices increase the effective volume of the pressure tank and start/start pump operation by closing and opening the pressure switch.
For pumps connected in parallel,
As seen in Japanese Patent Publication No. 59-720, parallel operation was started and canceled using a plurality of pressure switches with different set pressure values and a timer activated when the pressure switches were closed or opened.

In addition, in order to detect overcurrent due to motor locking and protect the device from burnout, etc., a thermal relay or the like is connected in series with the motor connection, and the motor is configured to cut off current when overloaded.

[Problem to be solved by the invention]

These conventional devices require multiple pressure switch closures.

Open information is used only for normal pump operation and stop, and is distinguished from abnormal status information. For this reason, although an abnormality in the motor input current can be detected using a thermal relay or the like, protection and notification based on the abnormality/detection of the pump condition, which is separate from the motor abnormality, has been insufficient.

[Means to solve the problem]

In order to solve the above problem, in addition to normal operation control, pressure information is taken in as a state parameter of the pump section along with a signal from the motor state detection means, and used as conditions for abnormality detection and protection. In addition, the pressure sensor system is used to capture linear information rather than the threshold boundary state using a switch.

[Effect]

Normally, when there is no abnormality in the pump section, the pump discharge pressure takes a function value with respect to the supplied water amount variable.

The turbine pump used in this device has a high discharge pressure when the water supply is minimal, and a high discharge pressure when the water supply is large.

Pump operation control starts pump operation or transitions to parallel operation by detecting the discharge pressure corresponding to the amount of water supplied, and under normal conditions the detected pressure is equivalent to the amount of water supplied.
In particular, it can be controlled without inferiority.

In addition, if any abnormality occurs in the pump or piping, water cannot be supplied and the discharge pressure will drop, but in order to distinguish this pressure drop from normal conditions (pressure drop when the amount of water supplied increases), the motor By determining the state detection value, it is possible to detect that the motor is in a light load state where water cannot be supplied, and the abnormal state can be identified by color.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

In FIG. 1, a pump 1 is constructed by directly connecting an impeller (not shown) of a pump portion 1b to a rotating shaft of a motor 1a. A suction pipe 4 is connected to the suction side of the pump 1,
The lower end of this suction pipe 4 reaches tank water 3 which is separated from the water supply and stored in a tank. A discharge pipe 5 is connected to the discharge side of the pump 1 . #5 for discharge pipe 5
A is provided. The discharge pipe 5 is connected to a common pipe 6, and a large number of branched faucets 6a are provided at the end of the common pipe 6 (only two are shown in FIG. 1).

Two pumps 1 are connected in parallel between a tank water 3 and a common pipe 6 via a suction pipe 4 and a discharge pipe 5.

A pressure sensor 7 and a pressure tank 8 constituting pressure detection means are provided in the discharge pipe 5 of the pump l. Faucet 6a
When the water supply starts and the water in the pressure tank 8 is supplied, the pressure in the pressure tank 8 decreases. A signal from the pressure sensor 7 is input to the instruction control section 11 of the control section 9 . The control section 9 has a power detection section 10 that constitutes a motor state detection means for detecting the operating state of the motor 1a. This power detection unit 10 detects the power of the motor 1a,
The detection signal is output to the instruction control section 11. The instruction control unit 11 compares the signal from the pressure sensor 7 with each preset control value of the operation operation (start of operation, transition to parallel operation, cancellation of parallel operation, stop of operation) to perform operation control processing. A determination unit 11a, a status determination unit 11b that compares the signal from the power detection unit 10 with a status setting value to determine the motor status, and a positioning unit 11c that controls the operating order of the pump 1. There is. Signals from the instruction control unit 11 are output to the motors 1a, respectively. Note that the motor state detection means may be a current detection unit or a rotation speed detection unit instead of the power detection unit 10.

FIG. 2 shows a conventional example, in which a discharge pipe 5' is provided with a pressure tank 8' and two pressure switches 7' with different switch operation setting pressures.

The states of these two pressure switches 7' are determined by the instruction control section 11' of the control section 9', and independent operation or parallel operation is performed.

In FIG. 3, each motor 1a is connected to one power source 1.
2 are connected in parallel. Magnetic contactors 13, 14 are connected to this power supply circuit. A power detection unit 10 is configured in the power supply circuit on the power supply 12 side from the electromagnetic contactors 13 and 14. The power detection unit 10 is composed of a coil 15 connected in series to the power supply circuit, a Hall element 16 connected in parallel, and a rectification/smoothing circuit 17 connected to the output side of the coil 15. The supplied power is detected by the DC voltage corresponding to the DC voltage. The output side of the rectifying/smoothing circuit 17 is indicated by A or B in FIG. 3, which indicates that it reaches A or B in FIG. 4.

A phase advance capacitor 18 is connected to the motor 1a.

In FIG. 4, the instruction control section 11 is mainly composed of an instruction control element 19 such as a microcomputer. From the power source 12 to the power transformer 20. Voo of the instruction control element 19 through the rectification/smoothing circuit 21 and the constant voltage circuit 22
, A circuit is connected to the Vss port. A reference timer for the instruction control element 19 is created by a clock circuit 23.

Inputs to the instruction control element 19 are from boats P10°P2O,
It is carried out from P41. A pressure sensor 7 is connected to port PIO and takes in pressure information. Boat P40. P
41 is connected to the output sides (A and B) of the power detection section 10 of the motor 1 via comparators 24 and 25. The D/A converter 26 is connected to the boat P30. P31. P
The digital value of 32.degree. Comparator 24,2
5 compares the output of the power detecting section 10 of the motor 1 with the corresponding value from the D/A converter 26, and when a match is made, the output from the port P40. P
41, baud)-P2O, P31. P32.
The digital value of P33 is stored in the internal memory as the current motor power value.

One side of the zero-cross timing input circuit 27 is connected to the secondary side of the power transformer 20, and the other side is connected to the port INT of the indicator element 19.

Port P20 of the instruction control element. A signal is output in synchronization with the timing of zero cross of P21, and is connected to drive triacs 30 and 31 of switching elements via phototriacs 28 and 29. Coils 32, 33 of electromagnetic contactors 13, 14 are connected to the triacs 30, 31 via the power supply 12, and the coils 32, 33 are made conductive by driving the tri-up 30, 31, and the electromagnetic contactors 13 Run .14.

Next, the flow of operation control will be explained using FIGS. 5 to 7.

FIG. 5 shows the main routine. Processing starts when the power supply 12 is turned on, and initial setting of F=O is performed (5
00), then change the signal of the pressure sensor 7 to the operation start setting value P.
. , , 510), and if it is less than Pan, the preceding device is turned on (520).

After turning on the preceding machine, the abnormality processing subroutine (53
Jump to 0).

FIG. 6 shows an abnormality processing subroutine. In the abnormality processing subroutine, conditions for abnormality determination are determined based on pressure values and electric power values. That is, when the detected pressure and the detected power value are below Pe and below We (600, 610).

Timer T that counts the abnormal state time. Start or continue (620), and when the set time is abnormal (below pe, below We) (630), stop the operation (631)
Furthermore, by providing the control section 9 with an abnormality display and notification function, the instruction control section 11 can issue an abnormality notification (632). If the abnormal state is no longer present, the abnormal state time count timer Te is cleared (611).

After exiting the abnormality processing subroutine, the process returns to the main routine and then jumps to the parallel control subroutine (540).

The parallel control subroutine controls transition and cancellation of parallel operation, and is shown in FIG. 7.
First, the parallel operation transition pressure value p Fon is set by the detected pressure.
700) If the detected power value is below We, it is further judged whether it is an abnormal state (710).

If there is no abnormality, the follower is turned on (720), and the flag F indicating parallel operation is set to 1 (730).

Return to main routine.

The detected pressure value is P. □If the detected power value is not less than We
In the following cases, the program returns to the main routine without transitioning to parallel operation. However, if the parallel operation is in the state before the condition for not shifting to parallel operation (determination of flag F in 711), the parallel release pressure P, which sets the detected pressure. 712 compared to ■
), if Ppoii or more, turn off the preceding machine (7
13) Clear the parallel operation status flag F (714)
.

When the parallel control subroutine returns to the main routine, flag F is used to determine whether the current operating state is a parallel operating state or not (55Q). When in parallel operation state with F=1,
Subsequently, subroutine processing of abnormality processing (530) and parallel control (540) is performed.

If it is not in a parallel operation state, the detected pressure is compared with the operation stop pressure Poca (560), and if it is equal to or higher than Port, the operation is stopped (570) and the process returns to the determination of the next operation start pressure (510).

〔Effect of the invention〕

According to the present invention, not only the normal operation control of the automatic water supply device but also the state of the pump section of the water supply device can be input and determined as information, so that abnormality detection control of the pump state other than motor abnormality is also possible.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an automatic water supply device of the present invention, FIG. 2 is a configuration diagram of a conventional automatic water supply device, FIG. 3 is an electric circuit diagram showing the motor state detection means of the automatic water supply device of the present invention, and FIG. An electric circuit diagram showing the instruction control unit of the automatic water supply device, FIG. 5 is a flowchart showing the main routine of the control method of the automatic water supply device, and FIG. 6 is a flowchart showing the abnormality handling subroutine in the main routine. FIG. 7 is a flowchart showing a parallel control subroutine in the main routine. ■...Pump, 1a...Motor, 6a...Faucet,
Force sensor, 8...pressure tank, 9...control unit, power detection unit (motor state detection means), 11 control unit. 7...Pressure 10...Instruction

Claims (1)

[Claims] 1. A pressure tank is connected to the discharge side of a pump connected in parallel with a motor, and a pressure detection means is provided on the discharge side of the pump, and a signal from the pressure detection means is received, and an arbitrary low A control unit that operates one pump by detecting a pressure point and operates two pumps in parallel by detecting a pressure drop due to an increase in water supply, and a motor state detection means that detects the operating state of the motor. In automatic water supply equipment,
An automatic water supply device characterized in that the state of each motor and pump is monitored and their operation controlled by arbitrary signal points from the pressure detection means, arbitrary signal points from the motor state detection means, and state time counting by the control section. operation control method. 2. In claim 1, the pressure detection means is a pressure sensor, the motor state detection means is a motor input current,
Alternatively, by detecting an arbitrary low pressure signal point from the pressure sensor and a signal below the arbitrary current value of the motor input current as the motor input power for a set time, abnormalities on the pump suction side can be detected and operation controlled. A method for controlling the operation of an automatic water supply device, characterized by: 3. In claim 1, the pressure detection means is a pressure sensor, the motor state detection means is a motor input current,
Alternatively, the conditions for transition from single pump operation to two pump parallel operation can be set as motor input power by logical product in addition to an arbitrary low pressure point. An operation control method for an automatic water supply device, characterized in that water is added as a value equal to or higher than a set value.