JP4030459B2 - Variable speed water supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a variable speed water supply apparatus that maintains a pump discharge pressure constant or a terminal pressure constant by an estimation method by operating a pump motor at a variable speed.
[0002]
[Prior art]
Conventionally, in a water supply apparatus that keeps the pump discharge pressure constant or the terminal pressure constant by an estimation method by operating the pump motor at a variable speed, a frequency converter (so-called inverter) is used as a general variable speed means of the pump motor. ) Is often used. FIG. 15 shows an example of a communication control configuration of a conventional variable speed water supply apparatus. The variable-speed water supply device uses a frequency converter to operate the pump motor at a variable speed, thereby making the pump discharge pressure constant or the pump water discharge pressure to keep the water supply water pressure at the end consumer side constant. Control the pressure.
[0003]
For this reason, the variable speed water supply apparatus includes an operation display unit 10 including an operation switch 11 for operating and stopping the pump, an indicator lamp 12 for displaying an operation state, and the like. The operation display unit 10 is connected to a control unit 15 including a central processing unit (CPU) 17 by a signal cable 16, and various signals are transmitted between the operation display unit 10 and the control unit 15.
In addition, the control unit 15 is connected to a frequency converter 18 that supplies an arbitrary frequency / voltage to the motor M that drives the pump P by a cable 19. An operation / stop command, a frequency command, a failure signal output, a failure return input, an operation signal, and the like are transmitted from the control unit 15 through the cable 19. The frequency converter 18 is supplied with power from a three-phase AC commercial power supply, once rectified and converted to DC, and then inversely converted to AC power having a frequency based on the frequency command from the control unit 15 described above. Then, by supplying the reversely converted electric power to the motor M, the pump P is operated at a predetermined speed, so that the discharge pressure is constant or the estimated terminal pressure is constant.
[0004]
Thus, in the conventional variable speed water supply apparatus, one frequency converter corresponds to one motor that drives the pump, and one control unit 15 that controls the operation of the pump further includes this. Correspondingly, one operation display unit 10 for supplying an operation signal to the control unit is further compatible. The operation display unit 10 and the control unit 15 are connected by a cable 16 made up of a number of signal lines, and the control unit 15 and the frequency converter 18 are similarly connected by a cable made up of a number of signal lines. 19 was connected.
[0005]
[Problems to be solved by the invention]
However, if the control devices are arranged in a one-to-one correspondence with the motor pump as in the prior art, the operation of the water supply device having a plurality of pumps becomes complicated. In addition, when multiple pumps are controlled by a single central control unit, the number of signal lines between the units becomes enormous, and it is difficult to secure a space for the wiring and the wiring work. Problems such as malfunctions of the water supply device due to the water also occur.
[0006]
In addition, an operation display unit for performing various operation settings and various displays and a buzzer alarm of the water supply apparatus is generally installed on the door or the outer surface of the water supply apparatus control panel so that it can be easily operated and confirmed. On the other hand, the control unit having the central processing unit is arranged inside the control panel for the protection and safety of the equipment, and various operation signals, various displays and alarm signals are also provided between the control unit and the operation display unit. I / O signal wiring is required, so miswiring and polarity errors are likely to occur.
[0007]
Further, depending on the installation position of the water supply device, the operation display unit may be difficult to operate or view, and conventionally, the orientation of the control panel itself has been changed or the installation position of the control panel has been changed.
[0008]
The present invention has been made in view of the circumstances described above, and a single control device can control a plurality of pumps with variable speed water supply, and these devices can be connected with a very small number of wires. It aims at providing a variable speed water supply apparatus.
[0009]
[Means for Solving the Problems]
The first aspect of the variable speed water supply apparatus of the present invention performs a plurality of frequency converters corresponding to a pump motor and a one-to-one correspondence with a pump motor, and performs a constant pressure control or an estimated terminal pressure constant control. A control unit having a central processing unit, and a controller for performing various operation settings and various displays of the water supply device, the control unit and the plurality of frequency converters, and the control unit and the controller are both information Alternatively, it has a communication means that can transmit and receive data according to a certain communication protocol, and the control unit and the controller use a power supply line for supplying power from the control unit to the controller by a burst signal superimposed on a power source. performs transmission of information or data, at the time of reception of information or data have a function of separating said burst signal and said power supply, said power supply A DC power source, characterized in that the power line connection of said control unit or the controller and nonpolar.
[0010]
The second aspect of the present invention, prior Symbol controller is characterized by having a circuit for taking out the capacitance coupling burst signal is superimposed on the power supply.
According to a third aspect of the present invention, the controller includes a power source / signal separation circuit for separating a direct current component of the burst signal.
[0011]
According to a preferred aspect of the communication control device of the variable speed water supply apparatus of the present invention, a plurality of pump motors are provided in a water supply apparatus that keeps the pump discharge pressure constant or the terminal pressure constant by the estimation method by operating the pump motor at a variable speed. Variable speed, a plurality of frequency converters corresponding to the pump motor one-to-one, a control unit having a central processing unit for performing constant pressure control or constant terminal pressure control, various operation settings and various displays of the water supply device And a detachable remote controller for performing a buzzer alarm, and the control unit and the plurality of frequency converters, and the control unit and the remote controller each transmit and receive information or data according to a certain communication protocol. Having a communication function that can be performed, and between each of the control unit and the plurality of frequency converters and each frequency change. The controllers are connected to each other by two communication lines in order, and the control unit supplies power to the remote controller via two power lines, and the control unit and the remote controller You may connect between them with two communication lines.
[0012]
Further, the power supply line between the remote controller and the control unit is overlapped with a direct current power source of the remote controller itself and a signal for transmitting / receiving information or data by a burst signal superimposed on the direct current power source, thereby providing power supply and communication control. You may carry out only with a power supply line of a book.
[0013]
In addition, the power supply line between the remote controller and the control unit superimposes the DC power supply of the remote controller itself and a signal for transmitting / receiving information or data by the burst signal superimposed on the DC power supply, thereby providing two power supply and communication controls. In the communication control apparatus that uses only the power line of the remote controller, the power line connection part of the remote controller is non-polar so that the predetermined control can be performed regardless of the polarity of the two power lines connected to the remote controller. It may be sex.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments and examples of the present invention will be described with reference to FIGS.
[0015]
FIG. 1 shows a first embodiment of the present invention. This is a water supply device that keeps the discharge pressure of the pump P constant or the terminal pressure constant by the estimation method by operating the pump motor M at a variable speed. A plurality of frequency converters 20 corresponding to a plurality of pump motors M, a control unit 22 having a central processing unit 21 that performs constant pressure control or estimated terminal pressure constant control, various operation settings and various types of water supply devices A detachable remote controller 23 for performing display and buzzer alarm is provided.
The control unit 22 and the plurality of frequency converters 20, and the control unit 22 and the remote controller 23 each have communication means that can transmit and receive both information and data according to a predetermined communication protocol. And between the control unit 22 and one of the plurality of frequency converters 20 and between each of the frequency converters 20, one by one with two communication lines (pair cable) 25 in order. Further, the control unit 22 supplies power to the remote controller 23 through two (one pair) power lines (pair cables) 26, and 2 between the control unit 22 and the remote controller 23. The communication lines (pair cables) 27 are connected.
[0016]
FIG. 2 shows a second embodiment of the present invention. A power supply line 28 between the remote controller 23 and the control unit 22 is overlapped with a direct-current power supply of the remote controller itself and a signal for transmitting / receiving information or data by a burst signal superimposed on the direct-current power supply, and power supply and communication control are performed. Only two (one pair) power lines (pair cables) 28 are used.
[0017]
FIG. 3 shows a third embodiment of the present invention. A power supply line between the remote controller 23 and the control unit 22 superimposes a DC power supply of the remote controller itself and a signal for transmitting / receiving information or data by a burst signal superimposed on the DC power supply, thereby providing two power supply and communication controls. The communication control performed only by the power line 28 is the same as described above. In this embodiment, the power line connecting portion of the remote controller is non-polar so that predetermined control can be performed regardless of the polarity of the two power lines 28 connected to the remote controller 23.
[0018]
In the present invention, as described above, the controller 22 having the plurality of frequency converters 20 and the central processing unit 21 of the water supply apparatus, and the detachable remote controller 23 that performs various operation settings, various displays, and buzzer alarms of the water supply apparatus. The control unit 22 includes communication means that can transmit and receive both pieces of information or data according to a predetermined communication protocol. Then, the control unit 22 and one of the plurality of frequency converters 20 and each frequency converter 20 are connected one by one in order by two communication lines 25, and the control The unit 22 supplies power to the remote controller 23 via a power line 26 and connects the control unit 22 and the remote controller 23 via a communication line 27. As a result, wiring for I / O signals, which has conventionally been necessary in many cases, can be made by connecting only two communication lines 25 between the frequency converter and the control unit, and between the frequency converter and other frequency converters. It is only necessary to connect two communication lines 25 in order, and the remote controller 23 and the control unit 22 can be connected by a total of four connections of two power lines (26) and two communication lines (27). be able to.
[0019]
Further, as described above, there has been a problem that the operation display unit is difficult to operate or is difficult to see depending on the installation position of the water supply device. In the present embodiment, the remote controller 23 is detachable and has only four connection lines (26, 27), and therefore can be easily moved as necessary. For this reason, it is not necessary to change the direction of the control panel itself or to change the installation position of the control panel.
[0020]
Further, the remote controller 23 and the remote controller 23 are controlled by superimposing a DC power source of the remote controller itself and a signal for transmitting / receiving information or data by a burst signal superimposed on the DC power source on a power line between the control unit 22 and the remote controller 23. Wiring between the units 22 can be performed with only two power lines 28 in combination with power supply and communication control.
[0021]
Further, by making the power line connection part of the remote controller non-polar so that predetermined control can be performed regardless of how the polarities of the two power lines 28 between the remote controller 23 and the control part 22 are connected. Wiring can be done without worrying about the polarity, eliminating the problem of miswiring.
[0022]
【Example】
(First embodiment)
FIG. 4 shows a first embodiment of the present invention. The basic configuration of the control unit is a central processing unit (CPU) 21, an interface circuit 30 for transmitting input / output signals from the water supply device to the CPU, a communication driver / receiver circuit 31 for data communication, a power supply circuit 32, an interface The circuit (RS485) 33 and the like. The power supply circuit 32 generates three types of power supplies for the CPU 21, interface circuit 30, communication driver / receiver circuit 31 and interface circuit (RS485) 33, and supplies them to each circuit. At the same time, power is supplied to the remote controller 23 via the power line 26.
[0023]
The CPU 21 has a central processing function, a memory function such as ROM / RAM / E ² PROM, a digital I / O function, an A / D / D / A conversion function, a serial data transmission / reception function (2CH), and the like. Input signals such as pressure, flow rate, and water level from the water supply device 29 are taken, and at the same time, calculation / judgment, etc. are performed in accordance with instructions from the remote controller 23, operation / stop command for the water supply device 29, frequency converter (1 to n) 20 outputs a signal such as a frequency increase / decrease command, calculates and determines the status information from the frequency converter 20, and sends it to the remote controller 23, the water supply device 29, and the like.
[0024]
The communication driver / receiver circuit 31 has a function of transmitting serial data from the CPU 21 to the remote controller 23 and a function of receiving serial data from the remote controller 23 and transmitting it to the CPU 21.
FIG. 5 shows a specific configuration of the communication driver / receiver circuit. In order to enhance noise and reduce costs, the communication driver / receiver circuit 31 uses a photocoupler 35 and is configured to only electrically insulate the CPU 21 from the remote controller 23 side.
[0025]
As shown in FIG. 6, the interface circuit (RS485) is a serial data transmission circuit with the frequency converter 20, and is insulated by a photocoupler 35 for noise enhancement. This is to standardize and generalize the interface with the outside. Even if a device other than the frequency converter has an RS485 interface circuit, it can be connected at any time, so that the system can be easily expanded.
[0026]
The remote controller 23 has a man-machine interface function. That is, the operation of the water supply device is stopped by the human operation, the operation amount is set, various alarm values are set, and the function of notifying the human state of the water supply device with a buzzer is controlled.
As shown in FIG. 4, the remote controller includes a communication driver / receiver circuit 40, a CPU 41, a display circuit (LCD) 42, an operation circuit (SW group) 43, a buzzer 44, and the like. The power of each circuit 40, 41, 42, 43, 44 is supplied from the control unit 22 through two power lines 26.
[0027]
The CPU 41 has a central processing function, a memory function such as ROM / RAM, a digital I / O function, an LCD drive function, and a serial data transmission / reception function, and displays the status of the control unit 22 on a display (LCD) 42. The information of the operation circuit (SW group) 43 is calculated and judged, displayed on the display (LCD) 42, and simultaneously transmitted to the control unit 22.
[0028]
The communication driver / receiver circuit 40 controls the function of transmitting serial data from the CPU 41 to the control unit 22 and the function of receiving serial data from the control unit 22 and transmitting it to the CPU 41. The circuit itself is the same as that of the control unit 22. Note that the display unit (LCD) 42 and the operation circuit 43 have a circuit configuration in the dynamic scan operation from the CPU 41 as shown in FIG.
[0029]
(Second embodiment)
FIG. 8 shows a circuit configuration of the second embodiment of the present invention. The basic configuration inside the control unit 22 includes a central processing unit (CPU) 21, an interface circuit 30 for transmitting input / output signals from the water supply device 29 to the CPU 21, a communication driver / receiver circuit 39 for data communication, and a power supply circuit. The basic configuration is the same as that of the first embodiment described above, but only the configuration of the communication driver / receiver circuit 39 is different.
[0030]
As a function of the communication driver / receiver circuit 39, the difference from the first embodiment is that (1) a power source and a transmission signal are combined and transmitted at the time of transmission. (2) Upon reception, the power supply and the transmission signal are separated, and only the transmission signal is transmitted to the CPU 21.
A transmission signal from the CPU 21 is sent to the burst wave generation circuit 51 together with the signal of the oscillation circuit 50 to generate a burst wave, and the amplification circuit 52 power-amplifies the signal.
[0031]
As shown in FIG. 10, the output transistor 55 and the power source of the amplifier circuit are connected by a filter (Z) 56 and a resistor (R). When the transistor 55 is OFF, that is, when the CPU 21 is “1”, the power source is connected. The voltage is output as it is to the pair cable. When the transistor is ON, that is, when the CPU is “0”, ΔV = power supply voltage × (1−R / (R + Z))
Burst signal is output.
At the time of reception, as shown in FIG. 9, the cable transmission signal is taken out by an amount corresponding to the alternating current by capacitance coupling, rectified and smoothed, subjected to waveform shaping, and sent to the CPU.
[0032]
The function of the remote controller 23 is the same as that of the first embodiment.
The configuration of the remote controller 23 is the same as that of the first embodiment, except that a power source / signal separation circuit 53 is provided and the direct current component of the burst signal is used as a power source. Explaining this point, as shown in FIG. 11, the lower limit value of the burst signal is used as a direct current component and used as a power source.
FIG. 12 shows an example of this circuit. In principle, a resistor / zener diode, a three-terminal regulator, a shunt regulator, or a constant current diode is also possible.
[0033]
(Third embodiment)
FIG. 13 shows a circuit configuration of the third embodiment of the present invention.
This embodiment is realized by inserting rectifier circuits 55 at both ends of the transmission cable 28 of the second embodiment, that is, the burst signal transmission input / output portion of the control unit 22 and the burst signal transmission input / output portion of the remote controller. is doing. The rectifier circuit 55 is a bridge-type full-wave rectifier circuit as shown in FIG.
[0034]
By inserting this rectifier circuit 55 on the receiving side, when the power on which the burst signal is superimposed is supplied to the input side, the polarity shown in FIG. 14 is always used regardless of the polarity (+, -pole) of the power supply line. The power output can be obtained. Accordingly, even if the polarity of the power supply line 28 is reversed, the power supply with the burst signal having the correct polarity is always supplied to the output side even if the polarity of the power supply line 28 is reversed. The non-polarization by the rectifier circuit 55 is effective only on the reception side, but may be arranged on the transmission side, and the power supply line 28 is bidirectional, so that the rectification circuit 55 is inserted at both ends thereof. Has been.
[0035]
【The invention's effect】
As described above in detail, the present invention has the following excellent effects.
[0036]
A plurality of pumps can be controlled at a variable speed with a single control device, and these devices can be connected by an extremely small number of wires.
[0037]
A control unit having a plurality of frequency converters and a central processing unit of the water supply device, and various operation settings of the water supply device, various displays, a detachable remote controller for performing a buzzer alarm, and the control unit are both information or data. Communication means that can perform transmission / reception according to a predetermined communication protocol, and communication between the control unit and one of the plurality of frequency converters, and between each frequency converter in order, two communication The control unit supplies power to the remote controller via a power line, and connects the control unit and the remote controller via a communication line. The input / output signal wiring can be connected between the frequency converter and the control unit with only two communication lines, and the frequency converter and the frequency converter are connected in turn with two communication lines. May be Re, further between the remote controller and the control unit can allow a communication line two total of four connected to the power supply line 2.
[0038]
Also, if the operation display section is difficult to operate or difficult to see depending on the installation position of the water supply device, the remote controller is detachable and has only four connection lines, so it can be easily moved as needed. It is not necessary to change the direction of the control panel itself or change the installation position of the control panel.
[0039]
Further, by superimposing a signal for transmitting and receiving information or data on the power line between the control unit and the remote controller by a burst signal superimposed on the DC power source of the remote controller itself and the DC power source, between the remote controller and the control unit It is also possible to perform the wiring with only two power lines in combination with power supply and communication control.
[0040]
Further, the polarity of the power line connecting part of the remote controller is made non-polar so that predetermined control can be performed regardless of how the polarities of the two power lines between the remote controller and the control part are connected. Wiring can be done without the need for wiring, eliminating the problem of miswiring.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a communication control device of a variable speed water supply apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of a communication control apparatus according to a second embodiment of this invention.
FIG. 3 is an explanatory diagram of a communication control apparatus according to a third embodiment of this invention.
FIG. 4 is an explanatory diagram of a communication control apparatus according to the first embodiment of this invention.
FIG. 5 is an explanatory diagram of a communication driver / receiver in FIG. 4;
6 is an explanatory diagram of a connection between a CPU and an interface circuit in FIG. 4;
7 is an explanatory diagram of a connection between a CPU and a display circuit of the remote controller in FIG. 4. FIG.
FIG. 8 is an explanatory diagram of a communication control apparatus according to a second embodiment of the present invention.
FIG. 9 is a time chart of a transmission side and a reception side in a state where a burst signal is added to a power source.
FIG. 10 is a circuit diagram of a portion for separating burst signals.
FIG. 11 is a time chart showing a relationship between a burst signal and a power source DC component.
FIG. 12 is a circuit diagram of a portion for taking out a burst signal.
FIG. 13 is an explanatory diagram of a communication control apparatus according to a third embodiment of the present invention.
14 is a circuit diagram of the rectifier circuit in FIG.
FIG. 15 is an explanatory diagram of a communication control device of a conventional variable speed water supply device.
[Explanation of symbols]
20 Frequency converter 21 Central processing unit (CPU)
22 Control unit 23 Remote controller 25, 27 Communication line 26 Power supply line P Pump M Motor

Claims (3)

A plurality of frequency converters for varying the speed of a plurality of pump motors, one to one with the pump motor;
A control unit having a central processing unit for performing constant pressure control or estimated terminal pressure constant control;
A controller for performing various operation settings and various displays of the water supply device,
The control unit and the plurality of frequency converters, and the control unit and the controller each have communication means capable of transmitting and receiving both information or data according to a predetermined communication protocol,
The control unit and the controller transmit information or data by a burst signal superimposed on a power supply using a power supply line that supplies power from the control unit to the controller, and when receiving the information or data, It has a function of separating the burst signal,
The variable speed water supply apparatus according to claim 1, wherein the power source is a DC power source, and the control unit or the power line connection unit of the controller has no polarity . Before SL controller variable speed water supply apparatus according to claim 1, characterized in that it comprises a circuit for taking out a burst signal is superimposed on the power source by capacitance coupling. The variable speed water supply apparatus according to claim 1 or 2 , wherein the controller includes a power source / signal separation circuit that separates a direct current component of a burst signal.

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