JPH0286975A - How to operate automatic water supply equipment - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of operating an automatic water supply device in which a plurality of pumps are connected in parallel.

[Conventional technology]

Conventionally, an automatic water supply system in which multiple pumps are connected in parallel uses a ratchet relay R in the operation circuit that controls the pump operation, as shown in Fig. 8, and when the pumps are operated alternately, the ratchet relay R is energized. Each time, the contacts were switched from the a side to the b side and from the b side to the a side, and the excitation of the switch coils ncl and nc2 at the start of operation was switched to set the preceding pump. In addition, as seen in Japanese Patent Publication No. 59-720, in addition to pressure switches for the preceding and following machines, a pressure switch for determining islanding operation, a corresponding relay coil, and a relay contact are used to switch from parallel operation to isolated operation. Some models are configured to stop faster than the preceding aircraft when transitioning to the previous model. Furthermore, as in Japanese Utility Model Application Publication No. 6149084,
Some pumps use flip-flops instead of ratchet relays to configure sequential circuits using electronic circuits to switch the pump operating order.

[Problem to be solved by the invention]

However, these conventional devices attempt to improve the reliability of the pump device by averaging the chances of pump operation, but the actual pump operation is difficult.

The operating time and power consumption of the pump differ depending on the amount of water used and the time of use, and it is not possible to average the pump operating state only by averaging the operating opportunities.

FIG. 9 shows an example of alternate operation. This figure is a time chart when the operation time is uneven, and it can be seen that the total time of the No. 2 machine operation becomes longer.

Note that this also applies to the case of parallel operation/cancellation of operation.

In addition, with conventional equipment, except for automatic water supply equipment for large-scale equipment, there is no way to know the pump usage time and power consumption and use it as a reference for inspection and maintenance, and installing a separate equipment meter is also costly. There was a problem.

An object of the present invention is to be able to control the operation of an automatic water supply system in which a plurality of pumps are connected in parallel so as to equalize the operating time or workload of each pump, and to provide a pump that is attached to a control section. To provide a method of operating an automatic water supply device which is advantageous in terms of cost and can display operating time and electric power amount as a reference for maintenance and inspection, without installing a separate instrument for equipment.

[Means for Solving Problem i11] The feature of the present invention adopted to achieve the above object is that an instruction control unit is provided for instructing the operation/stop of the pumps connected in parallel, and the instruction control unit controls the pump operation time. It is equipped with an instruction control element that counts, integrates and stores the time, compares the cumulative operating time of each pump at the start of operation, and instructs the pump with the shortest cumulative time to operate first, Also, when parallel-connected pumps are running in parallel at the same time, when canceling the parallel operation,
The system compares the accumulated operating time of each pump and controls the pumps to be stopped sequentially starting with the longest operating time.

Another feature of the present invention is that a pump operating state detection unit is provided in the instruction control unit to detect the operating characteristics of the pump motor and perform calculations with the pump operating time to determine the workload of the operated pump. Find out the driving and driving according to the amount of work.
The point is that the pump to be stopped is selected.

In addition, another feature of the present invention is that the instruction control section for instructing pump operation is provided with a display device capable of displaying a numerical value based on the output of the instruction control element, and a switch for instructing the instruction control element to display the display, and the switch is operable. By doing this, the processing contents and memory contents of the instruction control element, such as the cumulative pump operation time, the current motor input value, and the cumulative power value, are displayed.

[Effect]

According to the present invention, which employs the above-mentioned operation method, it is possible to select a pump by sequentially counting and comparing the operation time, thereby eliminating bias in operation time due to averaging of operation opportunities, and Time averaging can be achieved.

In addition, by detecting the motor input and calculating it with the operating time, the power consumption of the pump motor can be determined. Based on this, the pump operation/stop order can be selected to average out the pump motor workload. can be achieved.

Further, by inputting a signal to the instruction control element, the operating time and power consumption stored in the instruction control element can be displayed on the external display section.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, a pump 1, generally designated by the reference numeral 1, has an impeller (not shown) of a pump portion 1b directly connected to a rotating shaft of a motor 1a. On the suction side of the pump 1, there is a suction pipe 4.
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.

The discharge pipe 5 is provided with a valve 5a. The discharge pipe 5 is
It is connected to a common pipe 6, and a plurality of branched faucets 6a are provided at the end of the common pipe 6 (only two faucets 6a are shown in FIG. 1). That is, in the case of FIG. 1, two pumps 1 are located between the tank water 3 and the common pipe 6 and are connected in parallel via the suction pipe 4 and the discharge pipe 5.

The pump 1 is operated independently or in parallel depending on the amount of water supplied. The discharge pipe 5 of one of the pumps 1 is provided with a pressure switch 7 and a pressure tank 8 that constitute pressure detection means. Note that the pressure detection means may be replaced with a pressure sensor, instead of the pressure switch 7.

When water starts to be supplied from the faucet 6a and the water in the pressure tank 8 is supplied, the pressure in the pressure tank 8 decreases and the pressure switch 7 is closed. The signal from the pressure switch 7 is input to the instruction control section 11 of the control section 9 . The control section 9 includes a power detection section 10 that constitutes a motor characteristic value detection means for detecting the operating state of the motor 1a. This power detection section 10 detects the power of each motor 1a, and its detection signal is output to an instruction control section 11. Instruction control unit 11
includes a pump operation time counter, a calculation unit 11a that calculates power consumption from the operation time and detected power, a comparison unit 11b that compares the power consumption of each pump 1, and controls the order of operation and stop of each pump 1. The positioning portion 11c is provided with a portion 11c. Signals from the instruction control unit 11 are output to each motor 1a, respectively.

In FIG. 2, each motor 1a is connected to one power source 12 in parallel. Magnetic contactors 13 and 14 are connected to this power supply circuit. Electromagnetic contactor 13.
A power supply detection unit 10 is connected to a power supply circuit closer to the power supply 12 than the power supply 14 . The power detection unit 10 includes a coil 15 connected in series to a power supply circuit and a Hall element 16 connected in parallel.
and a rectifier/smoothing circuit 17 connected to the output side thereof, and arbitrary power is detected by the DC voltage corresponding to the power using the multiplication effect of the Hall element. The output side of the rectifying/smoothing circuit 17 is indicated by A and B in FIG. 2, which indicates that the output side reaches A and B in FIG. 3. A phase advance capacitor 18 is connected to the motor 1a.

In FIG. 3, 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° rectifier/smoothing circuit 21,
and VD of the instruction control element 19 via the constant voltage circuit 22.
D. Connected to VSS boat. 23 is a clock circuit that creates a reference timer for the instruction control element 19;

Coils 24 and 25 for opening and closing the electromagnetic contactors 13 and 14 (FIG. 2) are connected to the power source 12L via a one-circuit three-contact switch 26 and one pole 7a of the pressure switch 7.

Inputs to the instruction control element 19 are from boats P10 to P4. O
, P41. A circuit of the other pole 7b of the pressure switch 7 is connected to the boat PIO. Boat P40. The output sides (A and B) of the power detection unit 10 of the motor 1 are connected to P41 via comparators 27 and 28.

The D/A converter 29 is connected to the boat P30. P31゜P3
2. The digital value of P33 is converted into an analog value, and a voltage corresponding to the detected power value is sequentially generated and input to the comparators 27 and 28.

The comparators 27 and 28 are the power detection section 1 of the motor 1a.
The output of 0 is compared with the corresponding value from the D/A converter 29, and when they match, baud)-P2O.

Signal to P41 and boat P30. 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 30 is connected to the secondary side of the power transformer 20, and the other side of the power transformer 20 is connected to the boat INT of the instruction control element 19.

Boat P20 of instruction control element 19. A signal is output from P21 at the timing of zero cross, and drives triacs 33 and 34, which are switching elements, via phototriacs 31 and 32. Triac 33, 34
is connected in parallel with the pole to which the coil 24.25 of the 1-circuit 3-contact switch 26 is connected, and by switching the 1-circuit 3-contact switch 26, the instruction control element 1
Even if there is no instruction control signal from pressure switch 7
The coils 24 and 25 are energized and stopped by opening and closing one of the poles 7a, and thereby the pump 1 is started and stopped.

FIG. 4 shows a circuit for displaying the memory contents of the instruction control element 19. Regardless of when the pump is running or stopped, by inputting a combination of signals or a signal at arbitrary timing to the instruction control element 19 via the external switch 35, the operating time and integrated power value stored in the instruction control element 19 can be changed. , or display the current input value on the display unit 36.

Thus, the pump 1 first starts operating in response to a signal from the pressure switch 7, and then stops when the pressure switch 7 is tapped or electric power is detected due to a small amount of water.

FIG. 5 is a time chart showing the operation and stop of the pump 1 which is being operated alternately (the numbers below the chart indicate the unit time that is the cumulative operation time). After the No. 1 unit starts and stops (step 40), the No. 1 unit.

The cumulative operating time of the No. 2 machine is 1 and O, and the next operation starts with the No. 2 machine with the short cumulative time (step 41). Furthermore, when starting operation in step 42, the accumulated time up to that point is 2 and 3 for the first and second machines, respectively, and the first machine with the shortest accumulated time continues to operate. This part is the difference from simple alternating operation. Note that the above is an example of controlling the driving order based on the cumulative driving time.
In the figure, an example is shown in which the operation order is controlled by integrated power (work amount). The vertical axis in FIG. 6 does not indicate the running/stopping state in FIG. 5, but indicates the instantaneous value of motor input per unit time (the numbers below the chart indicate the integrated value of electric power). In step 43 of Fig. 6, the accumulated values up to that point are 5 and 10 for No. 1 and No. 2 machines, respectively.
, and the No. 1 unit with the smaller value will start operation next.

FIG. 7 shows an example of alternating parallel operation based on operation time integration. In step 44, since the cumulative time of the first machine is longer than that of the second machine, the first machine, which is a parallel operation following machine, is stopped.
Parallelism has been canceled. In addition, in step 45, since the accumulated time of the first machine is still long, the first machine is stopped and the parallelism is canceled, so it is clear that the first machine is the leading machine and the second machine is the following machine. I understand. Parallel operation is canceled by stopping the pump with the longest cumulative time, regardless of whether it is leading or following. Note that this also applies when the integrated power (amount of work) is used as a condition for determination.

〔Effect of the invention〕

The present invention is as described above, and according to the present invention, in an automatic water supply system in which a plurality of pumps are connected in parallel, operation can be controlled so that the operating time or workload of each pump is made uniform. In addition, the pump operating time and electric energy can be displayed in a form attached to the control unit and used as a reference for maintenance and inspection, and there is no need to install a separate instrument for equipment, which is advantageous in terms of cost.

[Brief explanation of drawings]

1 to 7 show an automatic water supply device suitable for carrying out the method of the present invention, as well as time charts of various signals thereof, and FIG. 1 is an explanatory diagram of the overall configuration of the automatic water supply device of the present invention,
Figure 2 is an electric circuit diagram of the automatic water supply device motor characteristic detection section.
Figure 3 is an electric circuit diagram of the automatic water supply device instruction and control section, Figure 4 is a display circuit diagram attached to the automatic water supply device instruction and control section, and Figure 5 is an electric circuit diagram of the automatic water supply device instruction and control section.
Figure 6 is a time chart showing alternate operation control based on the operating time of the automatic water supply device, Figure 6 is a time chart showing alternate operation control based on the power consumption of the automatic water supply device, and Figure 7 is an alternating operation control based on the operation time of the automatic water supply device. FIG. 8 is a time chart diagram showing parallel operation control, FIG. 8 is an operation circuit diagram of an operation control instruction section in a conventional automatic water supply device, and FIG. 9 is a time chart diagram showing alternate operation of the automatic water supply device shown in FIG. 8. . DESCRIPTION OF SYMBOLS 1... Pump, 1a... Motor, 1b... Pump part, 7... Pressure switch, 8... Pressure tank, 9... Control part, 10... Power detection part, 11... Instruction control section.

Claims (1)

[Claims] 1. It has a plurality of pumps connected in parallel, and one pump starts operation by detecting an arbitrary pressure point, and detects an arbitrary high pressure point or a low water supply point. In a method of operating an automatic water supply device that automatically stops operation when A method for operating an automatic water supply device, characterized in that a pump to be operated is selected according to the operating time. 2. A method for operating an automatic water supply device according to the invention as set forth in claim 1, characterized in that a pump with a short cumulative operating time is operated in advance at the start of operation. 3. In a pump device that has pumps connected in parallel, the water supply amount increases while one pump is operating, and other pumps are operated in parallel depending on the arbitrary water supply amount or arbitrary pressure point,
A method of operating an automatic water supply device characterized by stopping a pump having a long cumulative operation time when the water supply amount decreases from that during parallel operation and the parallel operation is canceled due to an arbitrary water supply amount or an arbitrary pressure point. 4. In the invention set forth in claim 3, an instruction control unit equipped with an instruction control element such as a microcomputer is configured to integrate the pump operating time, compare the accumulated operating times of each pump, and issue an instruction to stop the pump operation. A method of operating an automatic water supply device, characterized in that the method is carried out by: 5. Having pumps connected in parallel, and having motor characteristic value detection means for detecting the operating state of the pump motor,
A method for operating an automatic water supply device, characterized in that during pump operation, motor characteristic values are integrated and stored every hour, and a pump to be operated or stopped next is selected according to the integrated value. 6. In the invention described in claim 5, the automatic water supply device is characterized in that the pump characteristic value is the motor input power value, and the hourly integrated value is calculated as the motor input work amount (watt hours). how to drive. 7. The instruction control unit that instructs pump operation is equipped with a display device that can display numerical values based on the output of the instruction control element, and a switch that instructs the instruction control element to display the display.By operating the switch, the accumulated time of pump operation, the current Processing details of the instruction control element, such as motor input value and integrated power value,
A method of operating an automatic water supply device characterized by displaying stored contents.