JP2011014514A - Control device used for discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a discharge device that is capable of quickly restarting normal discharge even after fault discharge such as spark discharge is once caused by an environmental change despite its simple structure.SOLUTION: The control device includes a discharge portion 5 composed of at least one electrode 3 and at least one counter electrode 4, and a power supply 6 applying a predetermined voltage to the discharge portion 5. The discharge device 2 has attached thereto a detection portion 7 that detects fault discharge that invites a sudden change of values of the applied voltage and the current; n pieces of resistors R parallelly arranged between the discharge portion 5 and the power supply 6; and a control portion 8 that switches between the resistors in response to receiving fault discharge information. If the detection portion 7 detects fault discharge when the resistor R1 is connected between the discharge portion 5 and the power supply 6, the connection between the discharge portion 5 and the power supply 6 is temporarily shut off, and subsequently, the resistor R1 between the discharge portion 5 and the power supply 6 is switched to the resistor R2 having a larger resistance and a voltage is applied, and thereafter the (n-2) pieces of resistors are sequentially switched to the resistors R3 to Rn having a larger resistance. Thereby normal discharge is continued even after fault discharge.

Description

  The present invention relates to a control device used in a discharge device that generates a streamer discharge, a corona discharge, and the like. Specifically, after an abnormal discharge such as a spark discharge occurs, it can automatically recover and continue normal streamer discharge or corona discharge. The present invention relates to a control device used for a discharge device.

  In general, a discharge device applies a predetermined high voltage to a discharge part composed of one or more electrodes and one or more counter electrodes installed with a predetermined space in the one or more electrodes. It consists of a power supply. This discharge device generates streamer discharge, corona discharge, etc., and uses these discharges to remove certain effects, such as odors and dust in the air, and to maintain a good indoor environment. Has been. However, in this discharge device, when the humidity in the air is high, or when dirt or the like adheres to one or more electrodes and one or more counter electrodes corresponding thereto due to use, this causes a normal streamer discharge or corona discharge. Therefore, it shifts to an abnormal discharge such as a spark discharge in which a spark violently flies between both electrodes.

  Once the discharge device has shifted to an abnormal discharge such as a spark discharge, the discharge device will continue the abnormal discharge such as a spark discharge unless the application of a high voltage from the power source to both electrodes is stopped. If the dirt is flammable, it may cause a fire. Therefore, the application of high voltage to both electrodes will be stopped, but unless the cause of abnormal discharge such as high humidity or contamination of both electrodes is resolved, the application of high voltage to both electrodes will be started again. However, this discharge device shifts again to an abnormal discharge such as a spark discharge without resuming normal streamer discharge or corona discharge. For this reason, while the cause of abnormal discharge is not eliminated, this discharge device still loses the expected function of removing odors and dust in the air and maintaining a good indoor environment.

  From such a situation, there is a technique that can stably continue streamer discharge and can suppress the occurrence of abnormal discharge such as spark discharge as much as possible. In the discharge device of such a technique, a plurality of discharge units are divided into a plurality of discharge blocks, and a current control unit corresponding to each discharge block is provided, and each current control unit adds up the discharge current for each discharge block. Is controlled to be substantially constant. According to this discharge device, current concentrates in one discharge part, streamer discharge or the like is not performed in another discharge part, or, conversely, spark discharge occurs in the discharge part in which current is concentrated. As a whole, streamer discharge is stably performed (see, for example, JP-A-2005-245613).

  Further, a resistor is provided between a power source body that performs constant current control and an electrode of the discharge unit in the power supply circuit of the discharge unit in the discharge device. As a result, the power supply circuit has a first output characteristic in which the output current value is constant within the first output voltage range, and a second output characteristic in which the output current decreases from the maximum point of the first output voltage range. Is granted. According to this discharge device, on the first output characteristic, the discharge current of the streamer discharge in the discharge part is controlled to be constant, the spark discharge is suppressed, and the streamer discharge is stably performed. On the other hand, in the second output characteristic, As the voltage rises from the maximum point of the first output voltage range, the output current becomes smaller. Therefore, a region where spark discharge occurs is avoided, and as a result, spark discharge is suppressed and streamer discharge is stably performed. (For example, refer to JP 2007-328949 A).

  JP 2005-245613 A   JP 2007-328949 A

  In the discharge device of Patent Document 1, a plurality of discharge units are divided into a plurality of discharge blocks, and current control units corresponding to the respective discharge blocks are provided, and each current control unit has a discharge current for each discharge block. Since the total is controlled so as to be substantially constant, the configuration of current control becomes complicated. In addition, since this discharge device controls the total sum of discharge currents to be substantially constant, there is a risk that the voltage of some discharge parts in one discharge block may rise rapidly, resulting in the risk of spark discharge. In addition, spark discharge may occur due to changes in the discharge device environment, and once spark discharge occurs, even if the discharge device is stopped, it will be restarted unless the situation is resolved. Will result in spark discharge again.

  Further, as described in the specification, the discharge device of Patent Document 2 sets a voltage range (rated output voltage range) in which the streamer discharge can be stably generated and the risk of spark discharge is low, in the first output voltage range. Furthermore, it is desirable that the output current value that is constant on the first output characteristic is set to an output current (rated output current) that can sufficiently secure the streamer discharge performance. Actually, how to set these rated output voltage range and rated output current is a problem, and it is difficult to predict the environmental fluctuation of the discharge device. Depending on the configuration, the rated output voltage range and the set value of the rated output current are changed. In addition, once the spark discharge occurs, even if the discharge device is temporarily stopped, unless the situation is solved, the spark discharge is caused again even if restarted.

  Therefore, the present invention has been made in view of the above circumstances, and although the configuration is simple, even if an abnormal discharge such as a spark discharge occurs once due to environmental changes, normal discharge can be resumed promptly. It is an object of the present invention to provide a control device used for a discharge device.

The present invention has been proposed in order to achieve the above-mentioned problems, and is characterized by having the following configuration.
That is, according to the first aspect of the present invention, the discharge device comprises one or more electrodes and one or more counter electrodes installed with a predetermined space in the one or more electrodes, and the discharge unit. A power source that applies a predetermined voltage, and is arranged in parallel between the discharge unit and the power source, and a detection unit that detects an abnormal discharge that causes sudden fluctuations in the applied voltage value and current value in the discharge device. N resistors (R1 <R2... <Rn-1 <Rn) and a control unit that switches the resistance based on abnormal discharge information from the detection unit, and the discharge unit When the detection unit detects an abnormal discharge when the resistor R1 is connected to the power source, the control unit temporarily shuts off the discharge unit and the power source, and then the discharge unit and the power source. After switching to the resistor R2 having a large resistance value between After that, the n-2 resistors installed are sequentially switched to the resistors R3 to Rn having a large resistance value so that normal discharge is continued even after abnormal discharge in the discharge section. It is a control apparatus used for the discharge device to perform.

  The invention according to claim 2 is the control device used for the discharge device, wherein the discharge part mainly generates streamer discharge.

  The invention according to claim 3 is the control device used for the discharge device, characterized in that the discharge device mainly generates corona discharge.

  Further, the invention according to claim 4 is a photocatalyst carrier in which a discharge portion that mainly generates streamer discharges carries a photocatalyst on a conductive carrier and has a high resistance value, and the photocatalyst carrier. And a plurality of needle-like electrodes erected at substantially equal intervals from each other, and a ground electrode placed substantially in parallel with the photocatalyst carrier at a position 0.1 to 30 mm away from the tips of the plurality of needle-like electrodes. A positive or negative voltage of 3 to 30 KV is applied between the photocatalyst carrier and the ground electrode by a power source, and streamer discharge is mainly generated between the plurality of needle electrodes and the ground electrode. It is a control apparatus used for the discharge device characterized by being.

  The operation of the first problem solving means is as follows. In other words, when the resistor R1 is connected between the discharge unit and the power source, if the detection unit detects a sudden change in the applied voltage value and the current value, the control unit determines that abnormal discharge is being performed in the discharge unit. After the discharge unit and the power source are once cut off by the unit, the resistor R2 having a resistance value larger than that of the resistor R1 is switched between the discharge unit and the power source, and then the applied voltage is lowered to shift to normal discharge. Then, again, when the detection unit detects a sudden change in the applied voltage value and the current value, the discharge unit and the power source are once cut off by the control unit, and then the discharge unit is disconnected. After switching to the resistor R3 having a resistance value larger than that of the resistor R2, the applied voltage is lowered to shift to normal discharge. Thereafter, the installed n-3 resistors R4 to Rn are sequentially switched to the resistors R4 to Rn having a large resistance value so that normal discharge is continued even after abnormal discharge in the discharge section.

  Even if the discharge part generates streamer discharge, the action by the second problem solving means is the same as described above, after the discharge part and the power source are once shut off at the time of abnormal discharge, By switching to, normal streamer discharge continues to occur.

  Even if the discharge part generates corona discharge, the action of the third problem solving means is the same as described above, after the discharge part and the power source are once shut off at the time of abnormal discharge, By switching to, normal corona discharge continues to occur.

  The action of the fourth problem solving means is that the discharge part is separated by 0.1 to 30 mm from the plurality of needle-like electrodes standing on the photocatalyst carrier at substantially equal intervals and the tip parts of the plurality of needle-like electrodes. Even if it is a ground electrode installed at a position substantially parallel to the photocatalyst carrier and generates streamer discharge, the discharge part and the power source are temporarily shut off at the time of abnormal discharge in the same manner as described above, and then the resistance value is sequentially increased. By switching to a larger resistance, normal streamer discharge continues to occur.

As described above in detail, the present invention has the following effects.
According to the first aspect of the present invention, in the discharge device, a detection unit for detecting abnormal discharge of the discharge unit, n resistors arranged in parallel between the discharge unit and the power source, and control for sequentially switching the n resistors. The structure is simple, and even if an abnormal discharge such as a spark discharge occurs once due to environmental changes, normal discharge can be resumed quickly. .

  Further, the invention described in claim 2 can obtain the same effect as that of the invention described in claim 1 even if the discharge part generates streamer discharge.

  Further, the invention described in claim 3 can obtain the same effects as those of the invention described in claim 1 even when the discharge part generates corona discharge.

  In the invention according to claim 4, the discharge part for generating the streamer discharge is located at a position 0.1 to 30 mm away from the plurality of needle-like electrodes standing on the photocatalyst carrier and the tip parts of the plurality of needle-like electrodes. In addition, the same effect as that of the first aspect of the present invention can be obtained even if it is composed of a ground electrode disposed substantially parallel to the photocatalyst carrier.

It is a conceptual diagram of the control apparatus used for the discharge device which shows the embodiment of the present invention (Example 1). It is a connection diagram which shows the relationship between one discharge part and the control apparatus in the discharge device of this invention (Example 1). It is a conceptual diagram of the control apparatus used for the discharge device which shows other embodiment of this invention (Example 2). FIG. 4 is a plan view of a state in which a plurality of needle-like electrodes are erected on the photocatalyst carrier of the discharge device of FIG. 3 (Example 2). It is sectional drawing of the state which stood the several acicular electrode on the photocatalyst carrier (Example 2). (Example 2) which is explanatory drawing of the support body of FIG. (Example 2) which is a top view of the ground electrode of the discharge device of FIG. It is a conceptual diagram similar to FIG. 1 of the control apparatus used for the discharge device which shows other embodiment of this invention (Example 3).

  1 and 2, a control device 1 (hereinafter simply referred to as a control device 1) used for a discharge device has a discharge device 2 installed with one or more electrodes 3 and a predetermined space in the one or more electrodes 3. The discharge unit 5 is composed of one or more counter electrodes 4 and a power source 6 that applies a predetermined voltage to the discharge unit 5. The discharge device 2 is subjected to sudden fluctuations in the applied voltage value and current value. Detection unit 7 for detecting abnormal discharge, n resistors R (R1 <R2... <Rn-1 <Rn) arranged in parallel between the discharge unit 5 and the power source 6, and abnormal discharge from the detection unit 7 And a control unit 8 that switches the resistance R based on the information. When the detection unit 7 detects an abnormal discharge when the resistor R1 is connected between the discharge unit 5 and the power source 6, After the control unit 8 cuts off the discharge unit 5 and the power source 6 once, the discharge unit 5 and the power source 6 After switching to the resistor R2 having a large resistance value between them, a predetermined voltage is applied, and thereafter the (n−2) resistors installed are sequentially switched to the resistors R3 to Rn having a large resistance value, and the discharge unit 5 The normal discharge is continued even after the abnormal discharge.

  The discharge device 2 shown in FIG. 2 has the simplest configuration that causes discharge, and includes a discharge unit 5 in which one electrode 3 and one corresponding counter electrode 4 are combined, and a power source 6. . On the other hand, the control device 1 is added to the above-described discharge device 2, and specifically, a detection unit between the positive electrode 9 of the power source 6 and the electrode 3 of the discharge unit 5 in the discharge device 2. 7 and n resistors R are added, and a control unit for controlling them is provided.

  The discharge unit 5 has the simplest configuration shown in FIG. 2. However, the discharge unit 5 is not particularly limited as long as it has some merit by using the discharge. It generates electric discharge.

  The power source 6 is not particularly limited as long as it can supply necessary voltage and current to the discharge unit 5.

  The detection unit 7 of the control device 1 detects a sudden change in the voltage value and current value applied to the discharge unit 5 of the discharge device 2. For example, the voltage value of the discharge unit 5 is 5,000 V. When normal discharge is performed at a current value of 0.4 mA, the environment of the discharge part 5 fluctuates rapidly for some reason, the voltage value is 3,000 to 4,500 V, and the current value is 1.2 mA. This is to detect a case where the temperature fluctuates rapidly.

  The n resistors R of the control device 1 have different resistance values. When the first resistor is R1 and the nth resistor is Rn, these resistance values are in the range of several MΩ, and , R1 <R2... <Rn-1 <Rn. FIG. 2 shows a case where n = 4, and the four resistors R have a relationship of R1 <R2 <R3 <R4.

  As described above, when the detection unit 7 detects that the voltage value or current value of the discharge unit 5 has suddenly changed, a spark is generated from a normal discharge between the electrode 3 and the counter electrode 4 of the discharge unit 5. Suppose that it has shifted to an abnormal discharge such as a discharge. In response to the abnormal discharge information from the detection unit 7, the control unit 8 issues a command and temporarily shuts off the power supply 6 and the discharge unit 5 with a switch, and then the resistance value between the power supply 6 and the discharge unit 5. After switching to the large resistance R2, a predetermined voltage is applied to restore normal discharge even after abnormal discharge in the discharge section 5, and normal discharge continues until the abnormal discharge is started again thereafter. .

  When the detection unit 7 again detects that the voltage value or current value of the discharge unit 5 suddenly fluctuates, the power source 6 and the discharge unit 5 are temporarily shut off by a command from the control unit 8, and then the power source 6 and the discharge unit 5 are discharged. Switching to the resistor R3 having a large resistance value between the unit 5 and the normal discharge is restored again and continued. Thereafter, only (n−3) resistors R installed are sequentially switched to the resistors R3 to Rn having larger resistance values, so that normal discharge is sequentially recovered and continued. If normal discharge cannot be recovered even after switching to the last resistor Rn, the power source 6 and the discharge unit 5 are completely cut off to eliminate the cause of abnormal discharge, and then the first resistor R1 is applied. Reconnect to restore normal discharge and continue.

  3 to 7 show a control device used in a discharge device according to another embodiment of the present invention. The difference from the embodiment of FIGS. 1 and 2 is that the discharge device 2A mainly performs streamer discharge. The control device 1A is added to the discharge device 2A. This control device 1A has substantially the same configuration as the embodiment of FIGS. In the discharge device 2A, a photocatalyst 11 is carried on a carrier 10 having conductivity and the resistance value of the photocatalyst carrier 12 is high, and a plurality of the photocatalyst carrier 12 are erected on the photocatalyst carrier 12 at substantially equal intervals. The discharge electrode 5A and the ground electrode 14 installed substantially parallel to the photocatalyst carrier 12 at a position 0.1 to 30 mm away from the tip end portion 13a of the plurality of needle electrodes 13; A power source 6A is connected between the photocatalyst carrier 12 and the ground electrode 14 of the discharge part 5A. The power source 6A allows positive or negative 3 to 30 KV (hereinafter simply referred to as “± 3 to ± 30 KV”). Is applied to generate streamer discharge or corona discharge (hereinafter simply referred to as “streamer discharge”) between the plurality of needle-like electrodes 13 and the ground electrode 14. The photocatalyst carrier 12, the plurality of acicular electrodes 13, and the ground electrode 14 are housed in the cylindrical body 15, and fluid such as air can flow freely in the directions of arrows A and B.

  Since the carrier 10 of the photocatalyst carrier 12 is a plate-like and ceramic honeycomb structure 16, a fluid such as air can flow freely, and a particle size is formed on the surface 17 of the honeycomb structure 16. Is formed by sintering the surface forming ceramic particles 18 in the range of 1 μm to 50 μm. Therefore, a good uneven surface 19 is formed on the surface 17 of the honeycomb structure 16 and has a sufficient surface area, so that photocatalyst-induced light and active species are sufficiently distributed to realize a highly efficient photocatalytic action. it can.

  The carrier 10 is not limited to the honeycomb structure 16 described above, and may be a three-dimensional network porous structure, a lattice shape, a punching shape, or the like, as long as the fluid can flow and a sufficient surface area can be secured. Anything can be used. Further, the material is not limited to ceramic, and resin or paper can be used.

  The carrier 10 is provided with conductivity. This conductivity is obtained by applying activated carbon 20 to the uneven surface 19 newly formed on the surface 17 of the ceramic honeycomb structure 16. Realized. Further, the activated carbon 20 is supported by applying the photocatalyst 11. The resistance value of the photocatalyst carrier 12 as a whole is high, but this high resistance is realized by having a resistance value in the range of 1 to 100 MΩ.

The photocatalyst 11 is mainly anatase-type titanium oxide (TiO ₂ ) fine powder, but is not particularly limited as long as it has a photocatalytic action. The titanium oxide as the photocatalyst 11 contains about 20% of SiO ₂ as a binder while being the main component, and is baked and supported on the uneven surface 19 of the honeycomb structure 16 described above. Therefore, the baked titanium oxide is hard to fall off due to the anchor effect of the uneven surface 19, and it can prevent performance degradation and dust generation due to the dropping of the titanium oxide, and the performance can be improved and maintained, and can be regenerated. It becomes.

  As described above, a plurality of the needle-like electrodes 13 are provided on the plate-like photocatalyst carrier 12 at substantially equal intervals. As shown in FIGS. 4 and 5, the needle-like electrode 13 is penetrated through a regular rectangular lattice-shaped plastic frame body 21, and the plastic frame body 21 in this state is placed on the photocatalyst carrier 12. It is realized by doing. Since the plastic frame body 21 has a lattice shape, naturally, a fluid such as air can flow freely. The material of the needle electrode 13 is not particularly limited as long as it is a metal, but stainless steel and tungsten are excellent.

  The ground electrode 14 has a small hole 22 formed in a metal plate such as aluminum, and fluid such as air can flow freely. The ground electrode 14 is installed substantially parallel to the photocatalyst carrier 12 at a position 0.1 to 30 mm away from the tip portions 13 a of the plurality of needle-like electrodes 13. From the viewpoint of streamer discharge and the like, the shorter the distance between the ground electrode 14 and the needle electrode 13, the better. However, there is a risk of abnormal discharge such as spark discharge, that is, short circuit, and the distance is 0.1 mm or more. If the distance is more than 30 mm, there is no danger of a short circuit, but the utility value of streamer discharge or the like is reduced, and the apparatus becomes larger. Therefore, the distance between the ground electrode 14 and the needle electrode 13 is more preferably in the range of 0.5 to 10 mm, and still more preferably in the range of 1 to 5 mm. The ground electrode 14 is not limited to the above-described one, and any grounded electrode such as a honeycomb or lattice can be used.

  The power source 6A is electrically connected to the photocatalyst carrier 12 and the ground electrode 14, and applies a voltage in the range of ± 3 to ± 30KV between the photocatalyst carrier 12 and the ground electrode 14. By applying this voltage, streamer discharge or the like is generated between the needle electrode 13 and the ground electrode 14. The power source 6A is a DC power source of 3 to 30 KV, an AC power source of ± 3 to ± 30 KV, a pulse power source of +3 to +30 KV or −3 to −30 KV, a rectangular wave power source of ± 3 to ± 30 KV, and the like. The voltage of the power supply 6A is preferably as high as possible from the viewpoint of streamer discharge or the like. However, the risk of short circuit such as spark discharge is high, and is preferably ± 30KV or less, and conversely at a voltage less than ± 3KV. The risk of short circuit is eliminated, but the utility value such as streamer discharge is reduced. Therefore, the voltage of the power source 6A is more preferably in the range of ± 3 to ± 10 KV, and still more preferably in the range of ± 5 to ± 8.5 KV.

Next, the usage situation of the control apparatus 1A used for the discharge apparatus 2A having the above-described configuration will be described.
When the power source 6A is turned on and a voltage in the range of ± 3 to ± 30 KV is applied between the photocatalyst carrier 12 and the ground electrode 14, a plurality of needle-like electrodes 13 standing on the photocatalyst carrier 12 and from these Streamer discharge or the like occurs between the ground electrode 14 separated by 0.1 to 30 mm. Along with this streamer discharge or the like, photocatalytic induction light such as ultraviolet rays is emitted, and active species such as ozone, ions, and fast electrons are generated. Photocatalytic action-induced light such as ultraviolet rays activates the photocatalyst 11 and oxidizes and reduces substances adhering to the surface, thereby improving safety. On the other hand, active species such as ozone, ions, and high-speed electrons also improve the safety by oxidizing and reducing substances contained in the air that stays or passes between the plurality of needle-like electrodes 13 and the ground electrode 14. It also contributes to the activation of the photocatalyst 11.

  On the other hand, there is a possibility of a short circuit such as a spark discharge due to environmental fluctuations of the discharge device 2A, for example, an increase in humidity, a voltage change, a substance attached to the plurality of needle-like electrodes 13 and the ground electrode 14, etc. Since 12 itself has a high resistance value of 1 to 100 MΩ, spark discharge is prevented in advance, stable streamer discharge is continued, photocatalyst 11 is continuously activated, and other active species are generated. Will continue. However, when the spark discharge is generated by exceeding the protection level of the spark discharge due to the high resistance value of 1 to 100 MΩ that the photocatalyst carrier 12 itself has, the detection unit 7 of the control device 1A does not immediately detect the discharge unit 5A of the discharge device 2A. When it is detected that the voltage value or the current value fluctuates suddenly, a transition is made from a normal streamer discharge or the like to an abnormal discharge such as a spark discharge between the discharge part 5A, that is, the needle electrode 13 and the ground electrode 14. Suppose that In response to the abnormal discharge information from the detection unit 7, the control unit 8 issues a command and temporarily shuts off the power supply 6A and the discharge unit 5A with a switch, and then the resistance value between the power supply 6A and the discharge unit 5A. After switching to the larger resistance R2, a predetermined voltage is applied to recover normal streamer discharge after the abnormal discharge in the discharge section 5A, and normal streamer discharge or the like is continued unless transition to abnormal discharge again. Like that.

  FIG. 8 shows a control device used in a discharge device according to another embodiment of the present invention. The difference from the embodiment of FIGS. 1 and 2 is that the discharge device 2B is a two-stage electric dust collector. At a certain point, a control device 1B is added to the discharge device 2B, which is a two-stage electric dust collector. The control device 1B has substantially the same configuration as the embodiment of FIGS.

  The discharge device 2B, which is a two-stage electrostatic precipitator, collects charged particles 30 having a ionization line 31 and an ionization electrode 32 for charging particles in the air by corona discharge or the like, and charged particles by Coulomb force. A discharge part 5B composed of a dust collection part 35 in which dust collection electrode plates 33 and collecting counter electrode plates 34 are alternately arranged and equidistantly provided by spacers, and a power source 6B thereof, It consists of

  In the discharge device 2B, the ionization line 31 of the charging unit 30 is connected to the positive electrode 36 of the power source 6B, and the ionization electrode 32 is connected to the negative electrode 37 of the power source 6B.

  The dust collecting unit 35 is connected to a power source 6B in order to accumulate charges by applying a high voltage between the dust collecting electrode plate 33 and the dust collecting counter electrode plate 34, and further, the dust collecting electrode plate A high resistor 38 is connected in parallel between the power supply 33 and the power source 6B. The dust collection electrode plate 33 is connected to the positive electrode 36 of the power source 6A, and the dust collection counter electrode plate 34 is connected to the negative electrode 37 of the power source 6B.

  The discharge device 2B, which is an electrostatic precipitator having the above-described configuration, discharges in the discharge device 2B when air containing fine particles such as dust and cigarette smoke enters from the direction of the arrow K in FIG. The particles in the air are charged by corona discharge or the like by the ionization line 31 and the ionization electrode 32 of 5B, and further enter the dust collection unit 35 to be applied to the plurality of dust collection electrode plates 33 and the plurality of dust collection counter electrode plates 34. The charged fine particles are collected by Coulomb force, and the clean air after dust collection is discharged from the dust collecting unit 35. However, when an abnormal discharge such as a spark discharge occurs due to a change in the environment of the discharge device 2B, the detection unit 7 of the control device 1B immediately changes the voltage value or the current value of the discharge unit 5B of the discharge device 2B rapidly. This is detected, and it is assumed that the discharge unit 5B has shifted from normal corona discharge or the like to abnormal discharge such as spark discharge. In response to this abnormal discharge information, the control unit 8 issues a command to temporarily shut off the power supply 6B and the discharge unit 5B with a switch, and then the resistance R2 having a large resistance value between the power supply 6B and the discharge unit 5B. And a predetermined voltage is applied, and normal corona discharge or the like is recovered even after abnormal discharge in the discharge part 5B. Thereafter, even when the abnormal discharge is started again, the same correspondence as in the first and second embodiments is performed, and normal corona discharge or the like is continued.

  Although the control device used in the discharge device of the present invention has a simple configuration, even if an abnormal discharge such as a spark discharge occurs once due to environmental fluctuations in the discharge device, the normal discharge is promptly resumed. When it is desired to enjoy the merits of the discharge device, the applicability becomes extremely high.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Control apparatus 2, 2A, 2B Discharge apparatus 3 Electrode 4 Counter electrode 5, 5A, 5B Discharge part 6, 6A, 6B Power supply 7 Detection part 8 Control part 9, 36 Positive electrode 10 Carrier 11 Photocatalyst 12 Photocatalyst Carrier 13 Needle electrode 13a Tip 14 Ground electrode 15 Tube 16 Honeycomb structure 17 Surface 18 Surface layer forming ceramic particles 19 Uneven surface 20 Activated carbon 21 Plastic frame 22 Small hole 30 Charged portion 31 Ionizing wire 32 Ionizing electrode 33 Dust collection electrode plate 34 Dust collection counter electrode plate 35 Dust collection part 37 Negative electrode 38 High resistance R, R1-Rn Resistance

Claims (4)

  The discharge device comprises one or more electrodes and a discharge part composed of one or more counter electrodes installed in the one or more electrodes with a predetermined space, and a power source for applying a predetermined voltage to the discharge part. In the discharge device, a detection unit that detects an abnormal discharge that causes an abrupt change in applied voltage value and current value, and n resistors (R1 <R2... Arranged in parallel between the discharge unit and the power source). <Rn-1 <Rn) and a control unit that switches the resistance based on abnormal discharge information from the detection unit, and a resistor R1 is connected between the discharge unit and the power source. When the detection unit detects an abnormal discharge during the operation, the control unit temporarily shuts off the discharge unit and the power source, and then a resistance having a large resistance value between the discharge unit and the power source. After switching to R2, a predetermined voltage is applied, and then n installed Switch to two large becomes resistance R3~Rn resistor only sequential resistance value, the control device used in the discharge device being characterized in that so as to continue abnormal discharge after even normal discharge in the discharge unit.   The control device used for the discharge device according to claim 1, wherein the discharge unit mainly generates streamer discharge.   The control device used for the discharge device according to claim 1, wherein the discharge unit mainly generates corona discharge.   A discharge section that mainly generates streamer discharge includes a photocatalyst supported on a conductive support and a high resistance of the photocatalyst support. And a ground electrode installed substantially parallel to the photocatalyst carrier at a position 0.1 to 30 mm away from the tip of the plurality of needle electrodes, the photocatalyst carrier and the ground electrode 3. A discharge device according to claim 2, wherein a positive or negative voltage of 3 to 30 KV is applied between the plurality of needle-like electrodes and the ground electrode to generate a streamer discharge mainly between the plurality of needle electrodes and the ground electrode. Control device.

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