JP3041411U - Electrostatic water treatment device - Google Patents

Abstract

(57) [PROBLEMS] To provide an electrostatic water treatment device having high safety, consuming no unnecessary power, and having a simple structure. A water treatment device for performing water treatment by applying a direct current high voltage between an anode and a cathode, which are arranged so as to have a mutual capacitance through treated water, and the water treatment device. In an electrostatic water treatment apparatus including a control device for controlling the above, the control device controls an oscillation circuit that generates a high frequency voltage, a drive circuit that operates by the output of the oscillation circuit, and an output voltage of the drive circuit. A transformer for boosting voltage, a high-voltage circuit that double-rectifies high-frequency current from this transformer to generate a DC high voltage, detection means for detecting current flowing through this high-voltage circuit, and status of control device And a display circuit for controlling the oscillating circuit when the current flowing through the high voltage circuit exceeds a preset value, the oscillating circuit is stopped by the detecting means, and the displaying circuit displays an abnormal state.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 TECHNICAL FIELD The present invention relates to an electrostatic water treatment apparatus for performing water treatment by applying a high DC voltage between an anode and a cathode, which are arranged to have a capacitance with each other through treated water.

[0002]

[Prior art]

 As a conventional electrostatic water treatment device of this type, there is, for example, one disclosed in Japanese Patent Publication No. 4-60716. In this device, an oscillating circuit that generates a constant high-frequency voltage, a transformer that boosts the output voltage of the oscillating circuit, and a rectifier that double-voltage rectifies the high-frequency current from the transformer to generate a high DC voltage. A circuit, a means for detecting the current flowing through the high voltage section, and a safety measure by lowering the voltage of the high voltage section by lowering the oscillation voltage of the oscillation circuit when the current flowing through the high voltage section exceeds a preset value. It was something to take.

[0003]

[Problems to be solved by the device]

 However, in the electrostatic water treatment device described above, the positive electrode to which a high voltage is applied is placed in water while being covered with an insulating film, and the cathode is grounded. In an abnormal state such as when the insulation of the anode insulating film has deteriorated due to aging, the voltage at the high voltage section drops and electric shock is prevented.However, since the high voltage section is not completely cut off, there is a risk of electric shock. The danger remained. In addition, since the voltage is automatically restored, for example, if the voltage is automatically restored while the device is in contact with the equipment in order to check for a failure in a voltage drop state, it may lead to an electric shock accident. Was dangerous to. Furthermore, even if the voltage drops, the control circuit and the high-voltage circuit are operating, so that there is a problem in that power is consumed and useless power is consumed.

The present invention has been made in view of the above-mentioned conventional problems, and provides an electrostatic water treatment apparatus having high safety, consuming no unnecessary power, and having a simple structure. is there .

[0005]

[Means for Solving the Problems]

 A water treatment device that applies a high DC voltage between an anode and a cathode that are arranged so as to have a mutual capacitance through the water to be treated to perform water treatment, and a control device that controls the water treatment device. In an electrostatic water treatment apparatus including a control device, the control device boosts an output voltage of the drive circuit and an oscillation circuit that generates a high frequency voltage, a drive circuit that operates by the output of the oscillation circuit. A transformer, a high-voltage circuit that double-rectifies high-frequency current from the transformer to generate a direct high voltage, a detection circuit that detects a current flowing through the high-voltage circuit, and a state of the control device. And a display circuit for operating the high voltage circuit, wherein the detection circuit stops the oscillation circuit when the current flowing through the high voltage circuit exceeds a preset value, and the display circuit displays an abnormal state. It is a thing.

[0006]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an electrostatic water treatment apparatus of the present invention, and FIG. 2 is a partially cutaway perspective view showing an essential part of a water treatment device of the electrostatic water treatment apparatus of FIG. 3 is a block diagram showing a control circuit of the electrostatic water treatment apparatus of FIG. 1, and FIG. 4 is a circuit diagram of a high voltage circuit in the control circuit of FIG.

As shown in FIG. 1, the electrostatic water treatment apparatus of the present invention comprises a controller A which is connected to AC100V by a power cable 1, and a controller A which is connected to the controller A by a high voltage cable 2. The apparatus has a cylindrical water treatment device B controlled by the device A. As shown in FIG. 2, in the water flow treatment device B, a cylindrical container body 3 is grounded and also serves as a cathode, and an anode 4 covered with an insulating film is installed at the center of the container body 3. Now, a high voltage is applied between the container body 3 and the anode 4, and untreated water is made to flow into the container body 3 through the water inlet port 5 to pass through the container body 3 for water treatment, and the drain port. Drained from 6.

As shown in FIG. 3, the control device A includes a power supply circuit 10, a control circuit 20, a high voltage circuit 30, and a display circuit 40. The power supply circuit 10 is supplied with AC100V of a commercial power supply via the connection terminals 11 and 12. The connection terminals 11 and 12 are connected to the primary side of the power transformer 15 via the breaker 13 and the relay 14. A rectifier circuit 17 for a control circuit and a rectifier circuit 18 for a high voltage transformer described later are connected to the secondary side of the transformer 15. The connection terminals 11 and 12 are connected to the primary side of the power transformer 16 without the relay 14, and the secondary side of the power transformer 16 is connected to a rectifying circuit 19 for display.

The rectifier circuit 17 for the control circuit is a rectifier circuit that supplies DC + 15V and −15V to drive the control circuit 20, and the input terminal of this rectifier circuit 17 is the secondary side of the power transformer 15. It is connected to 0V and two taps for 18V, and performs full-wave rectification by a diode bridge circuit (not shown) of the rectifier circuit 17, and DC + 15V of a constant voltage obtained through a voltage stabilizing circuit (not shown). -15V is supplied to the control circuit 20 from the output terminal.

Further, the rectifier circuit 18 for the high-voltage transformer inputs 24V from the secondary side of the power transformer 15, performs full-wave rectification by a diode bridge circuit (not shown), and obtains 34 to 50V DC which will be described later. It is to be supplied to the middle point tap of the primary side of the high voltage transformer 31. Further, the display rectifier circuit 19 inputs 6.3V from the secondary side of the power transformer 16 and performs full-wave rectification by a diode bridge circuit (not shown). It supplies the light emitting diode.

The control circuit 20 operates by being supplied with a DC power supply plus 15V and −15V from the power supply circuit 10, and is a high voltage transformer oscillation circuit 21, a high voltage transformer drive circuit 22 as a drive circuit, and a current detection circuit. It is composed of a current monitoring comparator 23 and a voltage monitoring comparator 24. First, the high voltage transformer oscillating circuit 21 is an oscillating circuit using a well-known RC oscillating circuit (not shown), an operational amplifier, etc., and is made into an IC or a module to be a compact. Power MOSFETs 22a and 22b of a high voltage transformer drive circuit 22 for driving a high voltage transformer are connected to two output terminals 21a and 21b of the high voltage transformer oscillation circuit 21.

Further, a current monitoring comparator 23 and a voltage monitoring comparator 24, which are current detection circuits of the high voltage circuit 30, are connected to the input terminals 21c and 21d of the high voltage transformer oscillation circuit 21, respectively. On / off of the oscillation of the high-voltage transformer oscillation circuit 21 is controlled by the inputs of the current monitoring comparator 23 and the voltage monitoring comparator 24. The non-inverting input terminal 23a of the current monitoring comparator 23 is connected to the connection terminal for current detection of the high voltage circuit 30, and the inverting input terminal 23b is connected to the rectifier circuit 17 via the reference voltage setting resistor 25. It is connected to the -15V supply connection line. The inverting input terminal 24a of the voltage monitoring comparator 24 is connected to the voltage detecting connection terminal of the high voltage circuit 30, and the non-inverting input terminal 24b is connected to the rectifying circuit 17 via the reference voltage adjusting volume 26. It is connected to the + 15V supply connection line. Further, a voltage monitor (not shown) is connected to the inverting input terminal 24a side.

The high-voltage transformer drive circuit 22 of the drive circuit controlled by the high-voltage transformer oscillation circuit 21 is provided with two n-channel power MOSFETs 22a and 22b, and these two power MOSFETs 22a and 22b form a switching circuit. Is forming. The output terminals 21a and 21b of the high-voltage transformer oscillation circuit 21 are connected to the gates on the input side of the two power MOSFETs 22a and 22b, respectively, and the drains on the output side are connected to the high-voltage circuit 30 which will be described later. The primary coil of the transformer 31 is connected. The high voltage transformer drive circuit 22 generates a high frequency voltage of 34 to 50 V by the high voltage transformer oscillation circuit 21 oscillating at 2.6 kHz.

The high voltage circuit 30 that generates a high voltage by the oscillation of the high voltage transformer oscillation circuit 21 includes a high voltage transformer 31 and a quadruple voltage rectifier circuit 32. The high-voltage transformer 31 has a winding ratio of the primary coil and the secondary coil of 1:60, and is capable of boosting the high-frequency voltage generated in the high-voltage transformer drive circuit 22 to 2000 to 3000 V depending on the load. The quadruple voltage rectifier circuit 32 rectifies the voltage boosted by the high voltage transformer 31 with a quadruple voltage, and can further rectify the voltage boosted by the high voltage transformer 31 to a direct current of 8000 to 12000V. This high-voltage direct current is applied from the high-voltage terminal 33 to the anode of the water treatment container B.

Further, as shown in FIG. 4, the quadruple voltage rectifier circuit 32 has a connection terminal 34 for connecting the current monitoring comparator 23 and a connection terminal 35 for connecting the voltage monitoring comparator 24. There is. The connection terminal 34 is provided at a position where the highest voltage of 12000V appearing on the high voltage terminal 33 and the ground are divided by resistors R1 and R2, and the current is monitored so that the current flowing through the high voltage terminal 33 is 1.5 mA or less. The abnormality is monitored by the use comparator 23, and when an abnormality occurs, the oscillation circuit 21 is stopped and the occurrence of the abnormality is displayed on the display circuit 40. The connection terminal 35 is used to monitor the high voltage appearing on the secondary side of the high-voltage transformer 31 by the voltage monitoring comparator 24 of the control circuit 20 and operates at a voltage preset by the control device A. Whether or not it is monitored by a monitor (not shown), and the set voltage can be adjusted by the reference voltage adjusting volume 26.

The display circuit 40 for displaying the occurrence of an abnormality includes a yellow light emitting diode 41 for displaying a normal state, a red light emitting diode 42 for displaying an abnormal state, and a light emitting diode 41 and a red light emitting diode 42. And a relay 43 for switching the current to the red luminescence diode. The relay 43 supplies the power supplied from the rectifier circuit 19 with a red light emitting diode by the output voltage generated when the current monitoring comparator 23 detects an abnormal state. It is switched to the 42 side to notify the occurrence of an abnormality.

Next, the operation of the control device A configured as described above will be described. First, when AC100V is supplied between the connection terminals 11 and 12 of the power supply circuit 10, the rectification circuits 17, 18, and 19 generate AC18V, 24V, and 6.3V on the secondary side of the transformer 15 of the power supply circuit 10, respectively. The rectifier circuits 17, 18 and 19 output DC + 15 to -15 for the control circuit, DC34 to 50V for the high voltage transformer, and DC8V for the display circuit. Then, the high-voltage transformer oscillation circuit 21 of the control circuit 20 operates to generate a high-frequency voltage of 2.6 KHz, and the high-frequency transformer drive circuit 22 performs a switching operation by this high-frequency voltage. By this switching operation, a high frequency high voltage corresponding to the switching operation is generated on the secondary side of the high voltage transformer 31.

The high frequency high voltage generated on the secondary side of the high voltage transformer 31 is increased in voltage by a quadruple voltage rectifier circuit to be converted into direct current, and is output from the high voltage terminal 33 to the water treatment device B. The output voltage can be adjusted in the range of 8000V to 12,000V according to the increase / decrease of the water load by adjusting the voltage setting volume 25 of the voltage monitoring comparator 24 of the control circuit 20. As a result, a flat DC high voltage appears between the high voltage terminal 33 and the ground terminal 36 (FIG. 4).

As shown in FIG. 1, the high voltage terminal 33 and the ground terminal 36 are connected to the positive electrode 4 and the negative electrode main body 3 of the water treatment device B by a high voltage cable 2. In this water flow treatment device B, untreated water is introduced into the treatment device main body 3 through the water inlet 5, and a high voltage is applied to the untreated water in the treatment device main body 3 to enable efficient water treatment. By using such a flat high-voltage DC voltage, it is possible to cope with a sudden increase in load, such as water treatment when red water is generated in the water tower.

Next, an operation when an abnormality such as a short circuit occurs will be described. Now, the load current increases due to a short circuit of the water treatment device B, deterioration of insulation due to aging, etc., and rapid changes in the quality and quantity of water to be treated. This load current is the preset current of the current monitoring comparator 23. When the voltage corresponding to 1.5 mA is exceeded, an output voltage is generated in the current monitoring comparator 23 and is input to the high voltage transformer oscillation circuit 21 through the connection line 26 to stop the oscillation of the high voltage transformer oscillation circuit 21. At the same time, the power is supplied to the relay 43 through the connection line 27 to switch the power supply of the display circuit from the light emitting diode 41 for displaying the normal state to the red light emitting diode 42 for displaying the abnormal state. Further, the power supply circuit is cut off by inputting it to the relay 14 through the connection line 27, and all circuits except the display circuit 40 are stopped. As a result, the high voltage circuit 30 also stops operating, so that the voltage of the high voltage terminal 33 also becomes 0 V, and there is no danger of electric shock and it is extremely safe.

[0021]

[Effect of the invention]

 As described above, the present invention makes it possible to treat water with high power by using a flat DC high voltage, and it is possible to cope well with a sudden increase in treatment load. In addition, when an abnormal condition such as a short circuit or insulation failure occurs, the high voltage circuit can be automatically shut off, so that the electrostatic water treatment device can be made extremely safe. Further, when an abnormal state occurs, all circuits except the display circuit are stopped, so that it is possible to provide an economical electrostatic water treatment device without consuming unnecessary power.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an electrostatic water treatment apparatus of the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part of a water treatment device of the electrostatic water treatment device of FIG.

3 is a block diagram of a control device in the electrostatic water treatment device of FIG. 1. FIG.

4 is a circuit diagram of a high voltage circuit in the control device of FIG.

[Explanation of symbols]

 A Control device B Water treatment device 1 Power cable 2 High voltage cable 3 Container body 4 Anode 5 Water inlet 6 Drainage port 10 Power circuit 11 Connection terminal 12 Connection terminal 13 Breaker 14 Relay 15 Power transformer 16 Power transformer 17 Rectifier circuit 18 Rectifier circuit 19 Rectifier circuit 20 Control circuit 21 High voltage transformer oscillation circuit 22 High voltage transformer drive circuit 23 Current monitoring comparator 24 Voltage monitoring comparator 25 Reference voltage setting resistor 26 Reference voltage adjusting volume 27 Connection line 30 High voltage circuit 31 High voltage transformer 324 Double voltage rectifier circuit 33 High voltage terminal 34 Connection terminal 35 Connection terminal 40 Display circuit 41 Light emitting diode 42 Light emitting diode 43 Relay

Claims (1)

[Utility model registration claims] 1. A water treatment device for performing water treatment by applying a high DC voltage between an anode and a cathode which are arranged so as to have a capacitance with each other through the water to be treated, and the water treatment device. In an electrostatic water treatment apparatus including a control device for controlling a container, the control device includes an oscillation circuit that generates a high frequency voltage, a drive circuit that operates by the output of the oscillation circuit, and an output of the drive circuit. A transformer for boosting the voltage, a high-voltage circuit for rectifying the high-frequency current from the transformer by double voltage to generate a direct current high voltage, a detection circuit for detecting the current flowing through the high-voltage circuit, A display circuit for displaying a state, wherein when the current flowing through the high voltage circuit exceeds a preset value, the detection circuit stops the oscillation circuit, and the display circuit displays an abnormal state. Characteristic electrostatic water treatment device