JPH10101306A - Abnormality detector for ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the stabilized supply of ozone and to improve reliability and safety by dispensing with an expensive ozone detector to reduce cost and securely detecting water incorporation abnormality of water content. SOLUTION: An current detecting part 5 for detecting current Ip flowing in a power line 4 of a high voltage generating circuit 3 in an ozone generating part 2 and an abnormality judging part 6 for outputting an abnormality signal Sa if the detected value of the current Ip detected by the current detecting part 5 becomes lower than a reference value previously determined by the relation between the water content in a raw material for ozone generation and the current Ip are provided and the water incorporation abnormality that water is contained in the raw material for ozone generation is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator abnormality detection apparatus for detecting an abnormality in water content in a raw material for ozone generation.

[0002]

2. Description of the Related Art FIG. 3 shows a general ozone generator Mo. The ozone generator Mo includes an ozone generator 50 for generating ozone G, and air (oxygen) A that is a raw material for ozone generation.
Is supplied to the ozone generator 50. The ozone generation section 50 includes a silent discharge section 52 and a high voltage generation circuit 53. The high voltage generation circuit 53 further includes a high voltage transformer 54, an inverter section 55, and a current limiting resistor 5.
6 is provided. On the other hand, the raw material supply section 51 includes a pump section 57, a dehydration processing section 58, and a supply pipe section 59.
An on-off valve 60 and a flow control valve 61 are connected to 9, and a pressure gauge 62 is additionally provided. Note that 63 is a pump unit 57
And a connectable oxygen cylinder in place of the dehydration processing section 58.

In the raw material supply section 51, the air A sent from the pump section 57 is dehydrated by the dehydration processing section 58, and the dehydrated air A is supplied to the supply pipe section 59, the opening / closing valve 60 and the flow regulating valve 61. Is supplied to the silent discharge section 52 of the ozone generation section 50 via the. On the other hand, the ozone generator 50
In this case, the AC 100 V voltage is applied to the inverter unit 55 via the current limiting resistor 56, the frequency is converted to about 20 kHz, and the high-voltage transformer 54 converts the voltage to 7 to 8 kV.
Is converted to a high voltage. Then, the high voltage is applied to the electrode of the silent discharge unit 52 to perform a silent discharge, and ozone G is generated from oxygen in the air A.

[0004] By the way, such an ozone generator Mo
Uses dehydrated air A and oxygen gas from the oxygen cylinder 63, so if the dehydration treatment of the air A is insufficient or the piping connected to the oxygen cylinder 63 is damaged, etc. In the case where water is mixed in, for example, moisture A containing air or oxygen gas is supplied to the silent discharge unit 52 to cause dew condensation. As a result, the silent discharge becomes insufficient and the ozone generation efficiency decreases. Problem (abnormal water content).

For this reason, conventionally, an abnormality detection device for detecting such an abnormality in water content, specifically, the ozone generation section 5
An ozone detector 65 is attached to the ozone discharge side of the zero, and the amount of generated ozone G is monitored to detect a water content abnormality.

[0006]

However, the above-described conventional abnormality detection apparatus requires an expensive ozone detector 65 attached to the ozone discharge side of the ozone generation section 50, which leads to an increase in the cost of the entire apparatus. There was a problem that it was not possible to accurately determine whether the decrease in ozone G was due to a water content abnormality.

The present invention has solved the problems existing in the prior art as described above. In addition to reducing the cost by eliminating the need for an expensive ozone detector, the present invention provides an ozone detector by accurately detecting an abnormality in water content. It is an object of the present invention to provide an ozone generator abnormality detection device capable of ensuring a stable supply of water and further improving reliability and safety.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an ozone generator abnormality detecting apparatus 1 for detecting an abnormality in water content in a raw material for ozone generation. A current detection unit 5 for detecting the magnitude of the current Ip flowing through the power supply line 4 of the voltage generation circuit 3; and a detection value of the current Ip detected by the current detection unit 5 determines the amount of water in the ozone generating raw material in advance. Current Ip
Is provided with an abnormality determination unit 6 that outputs an abnormality signal Sa when the water content becomes equal to or less than a reference value for detecting a water content abnormality obtained from the relationship of the magnitude.

In this case, according to a preferred embodiment, the current detecting unit 5 includes the rectifier circuit 8 for converting the terminal voltage of the current limiting resistor 7 connected in advance to the power supply line 4 to DC, and the abnormality determining unit 6 A voltage discriminating circuit 9 that changes its output state when the output voltage of the rectifier circuit 8 drops below a preset voltage, and an output circuit that outputs an abnormal signal Sa based on the change in the output state of the voltage discriminating circuit 9 10 is provided. Note that the output circuit 10 includes a photocoupler 11 that is electrically isolated from the voltage determination circuit 9.

Accordingly, for example, when the air A containing moisture and insufficient dehydration is supplied to the ozone generator 2 and the discharge becomes insufficient, the power supply of the high voltage generation circuit 3 of the ozone generator 2 The current Ip flowing through the line 4 decreases. The magnitude of the current Ip is detected based on the terminal voltage of the current limiting resistor 7 connected to the power supply line 4 in advance, and the detected value of the current Ip is compared with a reference value in the abnormality determination unit 6, When the detected value falls below the reference value, an abnormal signal Sa is output. That is, the terminal voltage of the current limiting resistor 7 is rectified by the rectifying circuit 8 to be converted into a direct current, and is applied to the voltage determining circuit 9. The voltage discriminating circuit 9 changes its output state when the output voltage (detected value) of the rectifier circuit 8 becomes equal to or lower than a preset voltage (reference value), and based on the change of the output state of the voltage discriminating circuit 9. The output circuit 10 outputs an abnormal signal Sa. Therefore, even if the generation efficiency of ozone is reduced, an ozone detector for detecting the ozone generation becomes unnecessary, and since the magnitude of the current Ip accompanying the insufficient discharge is monitored, the abnormality in water content is accurately detected. Is detected.

[0011]

Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, a schematic configuration of an ozone generator provided with the abnormality detection device 1 according to the present embodiment will be described with reference to FIG.

In FIG. 1, M denotes an ozone generator, which includes an ozone generator 2 for generating ozone G, and a raw material supply unit 20 for supplying air (oxygen) A, which is a raw material for ozone generation, to the ozone generator 2. Become. The ozone generation unit 2 includes a silent discharge unit 21 and a high-voltage generation circuit 3, and the high-voltage generation circuit 3 further includes a high-voltage transformer 22, an inverter unit 23, and a current limiting resistor 7. The configuration and function of the raw material supply unit 20 are the same as those of the raw material supply unit 51 shown in FIG. The current limiting resistor 7 includes the abnormality detection device 1 according to the present embodiment.
Connect.

Next, the configuration of the abnormality detecting device 1 will be specifically described. The abnormality detection device 1 roughly includes a current detection unit 5 and an abnormality determination unit 6. The current detection unit 5 includes a rectifier circuit 8 that converts the terminal voltage of the current limiting resistor 7 connected to the power supply line 4 of the high voltage generation circuit 3 of the ozone generation unit 2 into a DC voltage in advance. With such a configuration, the ozone generation unit 2 can be implemented without changing the basic circuit configuration, and the abnormality detection device 1 can be retrofitted. The rectifier circuit 8 includes resistors R1 and R2, a rectifier diode D, and a smoothing capacitor C1.
It has a function of detecting the magnitude of p.

The abnormality determining section 6 includes a voltage determining circuit 9 and an output circuit 10. The voltage discriminating circuit 9 includes a voltage dividing resistor R
3 and R4, a resistor R5, and a transistor Q. When the output voltage of the rectifier circuit 8, that is, the DC voltage Ed (detection value) falls below a preset voltage Es (reference value), the output state of the transistor Q changes. I do.

Further, the output circuit 10 includes the photocoupler 1
1, a current limiting resistor R6 of the photocoupler 11, a resistor R7, a capacitor C2, and an output terminal 2 forming a smoothing circuit.
6, and outputs an abnormal signal Sa based on a change in the output state of the voltage determination circuit 9 (transistor Q). The photocoupler 11 has a function of electrically isolating the output circuit 10 from the voltage determination circuit 9. Thereby, the abnormality determination unit 6 has a function of outputting the abnormality signal Sa based on a decrease in the magnitude of the current Ip detected by the current detection unit 5 as a whole.

Next, the operation (function) of the abnormality detection device 1 according to the present embodiment will be described with reference to FIGS.

First, air A is supplied from the raw material supply unit 20 to the silent discharge unit 21 in the ozone generation unit 2. On the other hand, in the ozone generating section 2, the commercial power input section 24,
25 is applied to the inverter unit 23 through the current limiting resistor 7 and frequency-converted to about 20 kHz.
It is converted to a high voltage of 8 kV. Then, the high voltage is applied to the electrode of the silent discharge unit 21 to perform a silent discharge, and ozone G is generated from oxygen in the air A. At this time, if the dehydration process is normally performed on the air A, the magnitude (amplitude) of the current Ip flowing through the power supply line 4 of the high voltage generation circuit 3 in the ozone generation unit 2 is as shown in FIG.
An almost constant value is maintained as shown by the solid waveform in FIG.

Now, it is assumed that the air A with insufficient dehydration containing moisture is supplied to the ozone generator 2. In this case, the discharge becomes insufficient due to the formation of dew.
The current Ip flowing through the line decreases as shown by a virtual line waveform Ips in FIG.

On the other hand, the magnitude of the current Ip (Ips) depends on the current limiting resistor 7 connected to the power supply line 4 in advance.
Is detected from the magnitude of the terminal voltage. That is, the terminal voltage of the current limiting resistor 7 is applied to the rectifier circuit 8 and rectified and smoothed to be converted into a direct current, which is converted into a direct current voltage Ed.
This DC voltage Ed is shown in FIG.

The DC voltage Ed is applied to a voltage discriminating circuit 9. The output state of the voltage discriminating circuit 9 changes when the DC voltage Ed (detected value), which is the output voltage of the rectifier circuit 8, falls below a preset voltage Es (reference value). That is, the transistor Q is turned on when the DC voltage Ed is equal to or higher than the set voltage Es, and is turned off when the DC voltage Ed is lower than the set voltage Es. In this case, the set voltage Es is determined in advance by the resistances R3, R4, and R5 as the ozone generation material, that is, the magnitude at which the moisture content abnormality obtained from the relationship between the moisture content in the air A and the magnitude of the current Ip is detected. It is set by selecting the resistance value. FIG. 2C shows the on / off state of the transistor Q.

Further, when the transistor Q is turned on, the output side of the photocoupler 11 is turned on, and the output circuit 10 is turned on.
Is at a low level as shown in FIG. 2 (d). On the other hand, when the transistor Q is turned off, the output side of the photocoupler 11 is also turned off, and the output circuit 10 is turned off.
The output of the output terminal 26 at a high level as shown in FIG. 2D, that is, an abnormal signal Sa is output.

Therefore, if this abnormal signal Sa is given to alarm means such as a lamp and a buzzer, the alarm means is activated and the abnormality is notified to the outside. As described above, the abnormality detection device 1 according to the present embodiment eliminates the need for an expensive ozone detector, reduces costs, and monitors the magnitude of the current Ip due to insufficient discharge. Abnormal content can be detected accurately, ensuring a stable supply of ozone, and
The reliability and safety of the device can be increased.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The detailed circuit configuration and the like can be arbitrarily changed without departing from the gist of the present invention.

For example, the present invention can be similarly applied to a case where oxygen from an oxygen cylinder is used as a raw material for ozone generation or a case where oxygen from other supply means is used. Further, the current detection unit may use a resistor other than the current limiting resistor or another detection unit. Furthermore, the used parts can be replaced by parts having similar functions other than those illustrated. As an example, in the case of a transistor, either an NPN type or a PNP type may be used, and the transistor can be replaced with a semiconductor element having a similar function such as an FET.

[0026]

As described above, the ozone generator abnormality detecting device according to the present invention comprises: a current detecting section for detecting the magnitude of a current flowing in a power supply line of a high voltage generating circuit in an ozone generating section; Anomaly discrimination that outputs an abnormal signal when the detected value of the current detected by the unit becomes equal to or less than a reference value for detecting a water content abnormality obtained in advance from the relationship between the amount of water in the ozone generating raw material and the magnitude of the current. The following remarkable effects are obtained because of the provision of the parts.

Even if the generation efficiency of ozone is reduced, an expensive ozone detector for detecting the ozone is not required, so that the cost can be reduced.

Since the magnitude of the current caused by insufficient discharge is monitored, an abnormality in water content can be accurately detected, and a stable supply of ozone can be ensured, and the reliability and safety of the device can be improved. it can.

According to a preferred embodiment, if a rectifier circuit for converting a terminal voltage of a current limiting resistor, which is connected in advance to a power supply line, to a direct current is used as a current detection unit, the basic circuit configuration of the ozone generation unit is not changed. Can be implemented,
It can be retrofitted and can be easily implemented.

According to the preferred embodiment, if a photocoupler is provided in the output circuit, the output side can be electrically isolated from the voltage discrimination circuit, and further reliability and safety can be ensured.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of an abnormality detection device according to the present invention,

FIG. 2 is a time chart of a signal in each unit of the abnormality detection device;

FIG. 3 is a block diagram of an abnormality detection device according to the related art;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Abnormality detection apparatus 2 Ozone generation part 3 High voltage generation circuit 4 Power supply line 5 Current detection part 6 Abnormality judgment part 7 Current limiting resistance 8 Rectifier circuit 9 Voltage judgment circuit 10 Output circuit 11 Photocoupler G Ozone A Air Ip Current Sa Abnormal signal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasutoshi Iwasaki 1-30-4 Higashimagome, Ota-ku, Tokyo Inside Nagano Keiki Seisakusho Co., Ltd. (72) Seiichi Ako 1-30- Higashimagome, Ota-ku, Tokyo 4. Inside Nagano Keiki Seisakusho Co., Ltd. (72) Inventor Shoichi Abe 1-30-4 Higashimagome, Ota-ku, Tokyo Nagoya Keiki Seisakusho Co., Ltd. (72) Naoto Morita 14-18 Takatsuji-cho, Mizuho-ku Nagoya-shi Japan Special Ceramics Co., Ltd.

Claims (4)

[Claims] An abnormality detection device for an ozone generator for detecting a water content abnormality containing water in an ozone generation raw material, wherein a current for detecting a magnitude of a current flowing in a power supply line of a high voltage generation circuit in the ozone generation section. The detection value of the current detected by the detection unit and the current detection unit is equal to or less than a reference value for detecting the water content abnormality previously obtained from the relationship between the amount of water in the ozone generation raw material and the magnitude of the current. An abnormality detection device for an ozone generator, comprising: an abnormality determination unit that outputs an abnormality signal when the abnormality is detected. 2. An abnormality detection device for an ozone generator according to claim 1, wherein said current detection unit includes a rectifier circuit for converting a terminal voltage of a current limiting resistor connected in advance to said power supply line into DC. . 3. The abnormality determination unit includes: a voltage determination circuit that changes an output state when an output voltage of the rectifier circuit drops below a preset voltage; and a change in output state of the voltage determination circuit. The ozone generator abnormality detection device according to claim 1 or 2, further comprising an output circuit that outputs an abnormality signal. 4. The ozone generator abnormality detection device according to claim 3, wherein the output circuit includes a photocoupler electrically isolated from the voltage determination circuit.