JPH09165207A - Diagnosis device for ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diagnosis device for ozonizer capable of easily detecting the break down of a discharge tube. SOLUTION: A detector(DTC) 7 for diagnosis ismounted on the return wire of the grounded conductor of a step up transformer(TR) 5 mounted outside of the ozone generator ozonizer and securely detects the pule caused by the braking of fuse by using a band pass filter which cut out the established frequency e.g. 1kHz and set that the device can output an alarm to notice the breaking of preset numbers of fuses by counting the numbers of the broken fuses using preset counter. By this way, a worker can easily confirm the break down of discharge tube of fuse in a central control room and the exchanging of the discharge tube or fuse is made easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozonizer equivalent circuit of an ozoneizer diagnostic apparatus for cleaning water and sewage.

[0002]

2. Description of the Related Art In the operation state of a conventional ozone generator, a high voltage is applied to a plurality of discharge tubes in parallel via fuses. The presence or absence of discharge in the discharge part was visually determined from an external inspection window, the fuses were inspected for breaks, which discharge tube was broken, and then the fuse was stopped and the discharge tube was replaced. Since the inside of the ozonizer tank was in an active ozone atmosphere, a diagnostic detector could not be placed inside due to the effects of corrosion and the like. Incidentally, as a technique of this kind, there is JP-A-55-126504.

[0003]

For this reason, if the number of discharge tubes with fuse disconnection increases in a plurality of discharge tubes and the amount of ozone produced decreases, a worker goes to the site to check the discharge section from the external inspection window. The presence or absence of discharge was visually checked to check the number of defective discharge tubes, and when the number reached the specified number, the ozone generator was stopped and a normal fuse or discharge tube, or a fuse and a discharge tube were replaced. Not only does the worker have to go back and forth between the site and the central control room multiple times for replacement work, but the number of replacements is not known unless he goes to the site,
There was a drawback that extra fuses and discharge tubes had to be prepared at any time.

An object of the present invention is to provide an ozonizer diagnostic device capable of easily detecting a failure of a discharge tube.

[0005]

SUMMARY OF THE INVENTION The ozonizer diagnostic device of the present invention is a failure occurring in a fuse accident in an ozonizer equivalent circuit having a grounding means in which a plurality of ozonizer electrodes and fuses are connected in parallel on the secondary side of a step-up transformer. It is to provide a detector for detecting the pulse.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a diagram showing the principle of ozone generation.

The ozonized gas 21 has a dielectric Cd so that a gap Cg is formed between the high voltage electrode 18 and the ground electrode 19.
Is generated by applying an AC high voltage 17 between the electrodes 18 and 19 to cause a silent discharge in the void Cg and flowing dry air or oxygen gas 20 as a raw material into the void Cg.

FIG. 1 is a block diagram showing an embodiment of the ozone generator of the present invention.

The AC high voltage 17 is the input voltage P ₁ (200-
After converting 400V) into DC by converter (CONV) 1, high frequency (600-1,000Hz) is generated by inverter (INV) 3 in order to generate ozone efficiently.
Is converted into a voltage (7 to 10 kV) suitable for ozone generation by a step-up transformer (TR) 5, and a current is supplied to the ozonizer 6 through an insulating terminal 6-2. Here, the reactor 2 is for improving the ripple of the circuit phase, and the controller (CE) 4 is for performing the frequency setting by the set value S ₁ of the inverter (INV) 3.

In the internal equivalent circuit of the ozonizer 6 shown in FIG. 1, a plurality of series circuits (1 to n) of a fuse f, a dielectric capacitance Cd between electrodes, and a capacitance Cg of a gap are arranged in parallel.

A raw material gas 20, for example, dry air or oxygen (O ₂ ) is supplied into the ozonizer tank 6-1, and when it passes through the silent discharge region between the interelectrode voids Cg ₁ ... Cg _n , the ozonized gas 21 {Ozone (O ₃ ) + oxygen (O ₂ )} is generated and discharged from the outlet. The AC high voltage 17 for silent discharge is given by the step-up transformer (TR) 5, the voltage is 7 to 10 kV, and the frequency is 600 to 100.
The frequency is 0 kHz and the current is about 0.5 to 3 A.

FIG. 2 shows the current-voltage waveform of the ozonizer. For example, when the frequency F = 1 kHz, T = 1 / F =
The figure shows that the current waveform 8 and the voltage waveform 9 are cycled at intervals of 1 msec from 1 msec.

For example, when the fuse f ₁ is broken, [Cd
₁ + Cg ₁ ] suddenly turns off, causing a failure pulse 10
Occurs. Since the fault pulse 10 is superposed on the current i, by providing the diagnostic detector (DTC) 7 on the return current side on the ground side, it is possible to carry out the inspection and the device is inexpensive and safe because of the low voltage. To be kept. Diagnostic detector (DTC) 7
Connects the detection coil 11 to the secondary side of the step-up transformer (TR) 5.

Here, the silent discharge time period is indicated by td, and the polarity inversion switching time is indicated by tm. The period during which the silent discharge is performed is td, and this is repeated to bring the state close to continuous discharge to improve the ozone generation efficiency.

The fault pulse 10 when the fuse is blown is detected by the detection coil 11 provided on the ground side as shown in FIG.
Causes the return current i to be picked up as a voltage, and the amplifier 12
Is amplified to a processing level by the synchronous detector (SYN) 13 and the bandpass filter 14 to extract the fault pulse 10 voltage, the waveform shaper 15 shapes the waveform, and preset
The counter 16 counts, and when a certain set number of counts is reached, an alarm signal is output to notify the user of the main control room.

By this notification, the worker can set a predetermined discharge tube,
Since it suffices to prepare a fuse and go to the site, there is no need to make multiple round trips between the site and the central control room as in the conventional technology.
Replacement work is easy. The signal whose waveform has been shaped by the waveform shaper 15 immediately outputs an alarm signal,
It has become possible to immediately notify the user of the main control room of a failure signal such as a failure of one discharge tube or a blown fuse.

Here, as described above (FIG. 2), the silent discharge time period is td, and the switching time tm of the polarity reversal comes next. Therefore, is there a failure pulse 10 on the discharge current i during td? Since the synchronization detector (SYN) 13 is used to detect whether or not it is synchronized, the bandpass filter 14 cuts only the width of the applied frequency of 1 kHz ± 5% so that only the fault pulse 10 passes. The detection accuracy can be increased.

As mentioned above, the diagnostic detector (DTC) 7
By installing a fuse and counting the number of fuse burnouts, it is possible to grasp the number of fuse burnouts and predict the fuse replacement time, which is so-called predictive maintenance (planned repair). There is an effect that can be.

[0020]

As described above, according to the present invention, the diagnostic detector is provided in the return line on the ground side of the step-up transformer outside the ozonizer in the ozone generator so that the pulse current when the fuse is broken inside the ozonizer is electrically supplied. It becomes possible to detect
Fuse and discharge tube replacement work became easier. Further, in the diagnostic detector, for example, a bandpass filter excluding the 1 kHz component is provided to reliably detect a fuse disconnection pulse, and a preset counter counts a certain number of fuse disconnections, and an alarm notifies the user. By notifying it, predictive maintenance (planned repair) can be performed, an emergency stop can be eliminated, stable operation can be performed, and an economical effect such as the omission of an ozone backup machine on the system can be increased.

[Brief description of the drawings]

FIG. 1 is an equivalent circuit diagram of an ozone generator shown as an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a current voltage waveform of the ozonizer shown in FIG.

FIG. 3 is a circuit diagram showing a block diagram of the ozonizer diagnostic detector of FIG.

FIG. 4 is a side sectional view in the vicinity of an electrode showing the principle of the ozone generator used in FIG.

[Explanation of symbols]

5 ... Step-up transformer (TR), 6 ... Ozonizer, 6-1 ... Ozonizer tank, 6-2, 6-3 ... Insulation terminal, 7 ... Diagnostic detector (DTC), 8 ... Current waveform, 9 ... Voltage waveform 1
0 ... Fault pulse, 11 ... Detection coil, 12 ... Amplifier, 1
3 ... Sync detector (SYN), 14 ... Bandpass filter, 15 ... Waveform shaper, 16 ... Preset counter,
17 ... AC high voltage, 18 ... High voltage electrode, 19 ... Ground electrode.

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Shigeo Shiono 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Hitachi Kokubu Plant

Claims (2)

[Claims] 1. An ozonizer equivalent circuit having a grounding means in which a plurality of ozonizer electrodes and fuses are connected in parallel on the secondary side of a step-up transformer, and a detector for detecting a fault pulse generated in a fuse accident is provided in the equivalent circuit. An ozonizer diagnostic device characterized by being provided. 2. A fault pulse superimposed on the discharge current in the discharge voltage time zone of the ozonizer electrode is detected, and an alarm is output when the preset counter reaches a predetermined number of times. Ozonizer diagnostic device.