JP2013230455A - Electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric precipitator which uses no mechanical filter, promptly removes collected liquid dust from a dust collection part to prevent the occurrence of abnormal discharge and can promptly continue dust collection action even when abnormal discharge occurs.SOLUTION: An electric precipitator comprises: an ionization part 4 which has an ionization wire 2 and an ionization electrode 3 for charging water and oil; a dust collection part 7 which has a dust collecting electrode plate 5 and a dust collecting pair electrode plate 6 each for collecting charged suspended particles by Coulomb force; and a power supply 8 for supplying electric power to them. The dust collecting electrode plate 5 and the dust collecting pair electrode plate 6 are made to be rectangular and the rectangular dust collecting electrode plate 5 and the rectangular dust collecting pair electrode plate 6 are arranged in such a way that their plate surfaces 5a, 6a are vertical, and the dust collecting electrode plate 5 and the dust collecting pair electrode plate 6 are made to be inclined to a horizontal plane HP, consequently liquid dust CL remaining after dust collection of water and oil can be collected at a lowest part 5A of the dust collecting electrode plate 5 and a lowest part 6A of the dust collecting pair electrode plate 6.

Description

  The present invention relates to an electrostatic precipitator having an ionization unit, a dust collection unit, and a power source for supplying power thereto, and more specifically, a rectangular dust collection electrode plate and a dust collection counter electrode plate of the dust collection unit, Arrange the plate surfaces so that they are vertical, tilt the dust collection electrode plate and the dust collection counter electrode plate with respect to the horizontal plane, and place them at the bottom of the longitudinal sides of the dust collection electrode plate and dust collection counter electrode plate. The present invention relates to an electric dust collector that collects liquid dust collected after dust collection.

  As shown in FIG. 7, the electrostatic precipitator collects the charged floating particles by the Coulomb force, and the ionization part 52 having the ionization line 50 and the ionization electrode 51 for charging the floating particles in the air by corona discharge or the like. For this purpose, the dust collecting electrode plates 53 and the dust collecting counter electrode plates 54 are alternately arranged, and these are provided at equal intervals with spacers, and the ionization unit 52 and the dust collecting unit 55 are supplied with electric power. And a control unit 57 that controls power supply from the power source 56. The electrostatic precipitator charges the airborne particles in the air by the ionization unit 52, collects the airborne particles charged by the dust collector 55, removes the airborne particles, and improves the environment. It is used for holding. However, when the humidity in the air is high or the oil duster contains a large amount of oily smoke, this electrostatic precipitator mainly collects the dust collecting counter electrode 54 of the dust collecting part 55 as a liquid dust collecting substance by continuing the dust collection. In the state as shown in FIGS. 8 to 10, a large number of places are accumulated on the lower longitudinal side 54 a of the lower side.

  Then, the liquid dust collected on the lower side 54a in the longitudinal direction of the dust collection counter electrode plate 54 falls when it grows to a certain size by continuing the dust collection. However, since the grown liquid dust collection narrows the space between the dust collection electrode plate 53 and the dust collection counter electrode plate 54 and lowers the insulation resistance, a violent spark occurs between the dust collection electrode plate 53 and the dust collection counter electrode plate 54. Abnormal discharge such as flying spark discharge occurs, and the dust collection efficiency of suspended particles in the air is remarkably reduced or the dust collection is stopped, and the liquid dust collection as a result of the collection If there are many flammables, it may cause a fire.

From this situation, when the ratio of oil smoke and moisture is high as airborne particles in the air, the oil smoke / humidity removal filter attached to the suction port and the downstream area of the oil smoke / humidity is increased by 70%. There is an air treatment device with an electric dust collector that removes and then removes the remaining 30% of the oil smoke and moisture with the electric dust collector described above. This air treatment device with an electrostatic precipitator has a humidity sensor attached in the vicinity of the suction port that sucks in air with a high ratio of oily smoke and moisture, and according to the electric dust collector described above according to the measured humidity of the humidity sensor, The voltage applied to the ionization unit 52 and the dust collection unit 55 is adjusted by the control unit 57 that controls the power source 56. In other words, the applied voltage (KW) is obtained by the following equation using the humidity measured by the humidity sensor.
Applied voltage (KW) = − 1/30 × humidity (%) + 6.5
As the humidity measured by the humidity sensor increases, the amount of liquid dust collection increases, so the frequency of occurrence of abnormal discharge increases. However, according to the above formula, the applied voltage decreases accordingly, so that it is possible to avoid the occurrence of abnormal discharge, and to suppress the cause of a decrease in dust collection efficiency or a fire (for example, JP, 2008-36471, A).

  JP 2008-36471 A

  The air treatment apparatus with an electrostatic precipitator disclosed in Patent Document 1 removes 70% of the smoke and moisture in the air with a two-stage oil smoke / humidity removal filter that is a mechanical filter, and the remaining 30% that could not be removed. Is removed with an electric dust collector. At that time, in order to prevent the occurrence of abnormal discharge caused by the liquid dust collected by the electric dust collector, the voltage applied to the electric dust collector is determined by the humidity measured by the humidity sensor, and the frequency of abnormal discharge is reduced. Yes. Therefore, in this air treatment device with an electric dust collector, it is necessary to clean the two-stage oil smoke / humidity removal filter, and in addition, the humidity sensor is installed near the suction port in front of the two-stage oil smoke / humidity removal filter. As a result, the humidity sensor itself was immediately contaminated by oil smoke and humidity in the air, and it was difficult to accurately measure the humidity, and the voltage applied to the electrostatic precipitator could not be controlled accurately. The frequency of abnormal discharge cannot be reduced.

  Therefore, the present invention has been made in view of the above circumstances, and without using a mechanical filter, liquid dust collection is quickly removed from the dust collection unit, and an appropriate insulation resistance is maintained and an abnormality occurs in the dust collection unit. It is an object of the present invention to provide an electrostatic precipitator capable of preventing the occurrence of discharge and resuming normal electric field formation promptly even if abnormal discharge occurs and continuing the dust collecting action.

The present invention has been proposed in order to achieve the above-mentioned problems, and is characterized by having the following configuration.
That is, the invention described in claim 1 is an ionization unit having ionization lines and ionization electrodes for charging floating particles in the air by corona discharge or the like, and dust collection for collecting charged floating particles by Coulomb force. An electrostatic precipitator comprising: a dust collecting portion in which electrode plates and dust collecting counter electrode plates are alternately arranged and provided at equal intervals by a spacer; and a power supply for supplying power to the ionizing portion and the dust collecting portion The dust collection electrode plate and the dust collection counter electrode plate are formed in a rectangular shape, and the rectangular dust collection electrode plate and the dust collection counter electrode plate are disposed so that their plate surfaces are vertical. In addition, the rectangular dust collection electrode plate and the dust collection counter electrode plate arranged vertically are inclined with respect to a horizontal plane, and the longest side in the longitudinal direction of the dust collection electrode plate and the dust collection counter electrode plate is formed. Liquid after dust collection at the bottom Is an electric dust collector is characterized in that so as to collect the dust thereof.

  The invention according to claim 2 is the electric dust collector in which the inclination angle α of the rectangular dust collection electrode plate and the dust collection electrode plate with respect to the horizontal plane is in the range of 15 degrees to 75 degrees.

  The invention according to claim 3 is an electric dust collector in which a liquid collecting piece is extended at the lowest part of the side in the longitudinal direction of at least one of the rectangular dust collecting electrode plate and the dust collecting counter electrode plate. is there.

  The invention according to claim 4 is the electric dust collector in which the liquid collecting piece is extended only at the lowermost part of the side in the longitudinal direction of the rectangular dust collecting counter electrode plate.

  According to a fifth aspect of the invention, a constant current control unit that sends a constant current to the ionization unit but does not exceed a set voltage is applied to the power source, a predetermined voltage is applied to the dust collection unit, and an applied voltage value and A voltage stage control unit that includes a detection unit that detects abnormal discharge that causes an abrupt change in current value, and that issues a command to change the predetermined voltage to the dust collecting unit based on abnormal discharge information from the detection unit until no abnormal discharge occurs And a voltage changing unit that changes a predetermined voltage in response to a voltage change command from the voltage stage control unit, and a constant current is sent from the power source to the ionization unit by the constant current control unit, and When a predetermined voltage is applied to the dust part from the power source by the voltage stage control unit, and abnormal discharge occurs in the dust collection part, the voltage stage control unit temporarily shuts off the power source and the dust collection part. , The electric Change to a predetermined voltage abnormal discharge by changing section does not occur is applied to the dust collecting unit, even after the abnormal discharge occurs is an electric dust collector so as to continue the dust collecting effect.

  The operation of the first problem solving means is as follows. That is, when electric power is supplied from the power source to the ionization unit and the dust collection unit, the dust collection unit collects suspended particles in the air. However, if the suspended particles are water or oil, In addition, the dust is slightly collected on the dust collecting electrode plate, and the liquid dust collected flows on the dust collecting counter electrode plate and the dust collecting electrode plate which are inclined by gravity, and is located at the bottom of the lower side in the longitudinal direction. Since the liquid dust collected at the lower part and greatly grown there will eventually fall, the gap between the dust collecting electrode plate and the dust collecting counter electrode plate will not be narrowed to lower the insulation resistance.

  The action of the second problem solving means is that when the inclination angle α of the rectangular dust collecting electrode plate and the dust collecting counter electrode plate with respect to the horizontal plane is in the range of 15 to 75 degrees, the dust collecting electrode plate and the collecting electrode plate The liquid dust collected on the dust counter electrode plate flows on the dust collector electrode plate and the dust collector counter electrode plate, and easily collects in the lowermost part of the lower side in the longitudinal direction.

  The action of the third problem solving means is that the liquid collecting piece is extended at the lowermost part of the lower side in the longitudinal direction of at least one of the rectangular dust collecting electrode plate and the dust collecting counter electrode plate. The liquid dust collected on the dust collecting electrode plate and the dust collecting counter electrode plate flows on the dust collecting electrode plate and the dust collecting counter electrode plate, and is on the lower side in the longitudinal direction of one of them. Since it collects and falls on the liquid collecting piece extending at the bottom, the distance between this liquid collecting piece and the other one of the dust collecting electrode plate and dust collecting counter electrode plate is maintained. The insulation resistance between the dust collecting electrode plate and the dust collecting counter electrode plate is not lowered.

  The action of the fourth problem solving means is that the liquid collecting piece extends only at the lowermost part of the lower side in the longitudinal direction of the rectangular dust collecting counter electrode plate. Dust collected liquid flows on the dust collection counter electrode plate, and collects and falls in the liquid collection piece extending at the bottom of the lower side in the longitudinal direction, so the liquid collection piece and the dust collection electrode plate As a result, the insulation resistance between the dust collecting electrode plate and the dust collecting electrode plate is not lowered.

  The action of the fifth problem solving means is to send a constant current from the power source to the ionization unit by the constant current control unit, cause a stable corona discharge to the ionization unit, and charge suspended particles in the air passing therethrough, A predetermined voltage is applied from the power supply to the dust collection unit by the voltage step control unit to generate a stable electric field in the dust collection unit, collecting the charged floating particles that pass through it, and the detection unit collects dust in the collection process. When it is detected that abnormal discharge has occurred in the part, after receiving the abnormal discharge information, the voltage stage control unit temporarily shuts off the power source and the dust collection unit, and then changes the predetermined voltage by the voltage change unit and the dust collection unit To stop the abnormal discharge and continue the dust collecting action until a further abnormal discharge occurs, and then continue the series of abnormal discharge occurrence, abnormal discharge temporary interruption, predetermined voltage change, abnormal discharge stop and dust collection action continuation described above. Allow cycles of It continues.

As described above in detail, the present invention has the following effects.
According to the first aspect of the present invention, liquid dust collection can be quickly removed from the dust collection part without using a mechanical filter, and an abnormal discharge is generated in the dust collection part while maintaining an appropriate insulation resistance. In addition to preventing, it is possible to resume normal electric field formation promptly even if abnormal discharge occurs, and to continue the dust collecting action.

  In addition to the above-described effect, the invention described in claim 2 is configured such that the liquid dust collection material is placed on the lowermost side of the lower side in the longitudinal direction on the dust collection electrode plate and the dust collection electrode plate of the dust collection unit. It becomes easier to collect, and there is an effect that the liquid dust collected from the dust collecting portion can be removed even more quickly.

  In addition to the above-described effect, the invention described in claim 3 allows the liquid dust collector to be disposed on the lowermost side in the longitudinal direction on either the dust collecting electrode plate or the dust collecting counter electrode plate of the dust collecting portion. The liquid collecting piece extending in the lower portion is more easily collected, and there is an effect that the liquid dust collection material can be further rapidly removed from the dust collecting portion.

  Further, in addition to the above effect, the invention according to claim 4 is a liquid collecting piece extending a liquid dust collection object at the lowermost part of the lower side in the longitudinal direction on the dust collecting counter electrode plate of the dust collecting part, It becomes easier to gather, liquid dust collected from the dust collecting part can be removed more quickly, and further, the distance between the liquid collecting piece and the dust collecting electrode plate can be maintained at a large distance, and further abnormal discharge can be maintained. There is an effect that can prevent the occurrence.

  In addition to the above effect, the invention according to claim 5 can stably continue corona discharge in the ionization part, and even if abnormal discharge such as spark discharge occurs due to environmental fluctuations in the dust collection part, The normal electric field formation can be resumed promptly and the dust collecting action can be continued, and the maintenance frequency can be reduced as a whole.

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram of the electrostatic precipitator which employ | adopts embodiment of this invention (Example 1). It is a perspective view which shows the flow condition of the liquid dust collection material on the dust collection counter electrode plate in the electric dust collector of embodiment of this invention (Example 1). (Example 1) which is a side view which shows the liquid dust collected on the liquid collection piece of the dust collection counter electrode plate in the electric dust collector of embodiment of this invention. It is a front view which shows the liquid dust collection thing collected on the liquid collection piece of the dust collection counter electrode plate in the electric dust collector of embodiment of this invention (Example 1). It is a connection diagram which shows the voltage change part of the power supply in the electrostatic precipitator of embodiment of this invention (Example 1). It is a connection diagram which shows the other voltage change part of the power supply in the electrostatic precipitator of embodiment of this invention (Example 1). It is a conceptual diagram similar to FIG. 1 showing a conventional electrostatic precipitator. It is a perspective view which shows the flow condition of the liquid dust collection material on the dust collection counter electrode plate in the conventional electric dust collector. It is a side view which shows the liquid dust collection thing collected on the longitudinal direction lower side of the dust collection counter electrode plate in the conventional electric dust collector. It is a front view which shows the liquid dust collection thing collected on the longitudinal direction lower side of the dust collection counter electrode plate in the conventional electric dust collector.

  In the drawing, an electrostatic precipitator 1 is formed by an ionization unit 4 having an ionization line 2 and an ionization electrode 3 for charging floating particles in the air, for example, water or oil, by corona discharge, and the like. Dust collecting electrode plates 5 and dust collecting counter electrode plates 6 for collecting are alternately arranged, and these are provided at equal intervals with spacers, and ionization unit 4 and dust collecting unit 7 are supplied with electric power. A dust collecting electrode plate 5 and a dust collecting counter electrode plate 6 are formed in a rectangular shape, and the rectangular dust collecting electrode plate 5 and the dust collecting counter electrode plate 6 are arranged on their plate surfaces 5a. And 6a are arranged so as to be vertical, and the vertically arranged rectangular dust collecting electrode plate 5 and dust collecting counter electrode plate 6 are inclined with respect to the horizontal plane HP. Lower side 5b and 6 in the longitudinal direction of the dust counter electrode plate 6 The bottom 5A and 6A of, is obtained by adapted to be attracted liquid precipitator product CL after dust collecting suspended particles of water and oil in the air.

  The electrostatic precipitator 1 is a so-called two-stage charged electrostatic precipitator. The ionization unit 4 has an ionization line 2 connected to a positive pole 8a of a power supply 8 and an ionization electrode 3 connected to a negative pole 8b of a power supply 8. , Each connected. On the other hand, the dust collecting unit 7 is connected to a power source 8 to form a high electric field by applying a high predetermined voltage between the dust collecting electrode plate 5 and the dust collecting counter electrode plate 6, and further, A high resistance body 10 is connected between the electrode plate 5 and the power source 8. The dust collecting electrode plate 5 is connected to the positive electrode 8 a of the power source 8, and the dust collecting counter electrode plate 6 is connected to the negative electrode 8 b of the power source 8.

  The inclination angle α of the rectangular dust collection electrode plate 5 and the dust collection counter electrode plate 6 in the dust collection portion 7 with respect to the horizontal plane HP is in the range of 15 degrees to 75 degrees. When the inclination angle α of the dust collection electrode plate 5 and the dust collection counter electrode plate 6 is within this range, the collected liquid dust CL is smoothly moved on the dust collection electrode plate 5 and the dust collection counter electrode plate 6. And easily gather at the lowermost parts 5A and 6A of the lower sides 5b and 6b in the longitudinal direction. When the inclination angle α is less than 15 degrees, the liquid collection after dust collection is applied to the lowermost portions 5A and 6A of the lower side 5b and 6b in the longitudinal direction of the dust collection electrode plate 5 and the dust collection electrode plate 6. When it becomes difficult to collect the dust CL, conversely, when the inclination angle exceeds 75 degrees, the electrostatic precipitator 1 extends in the vertical direction and the overall height of the dust collector increases, and the suspended particles charged during the dust collection are collected by the dust collecting electrode. The distance passing between the plate 5 and the dust collection counter electrode plate 6 is shortened, leading to a decrease in dust collection efficiency. Therefore, a more preferable inclination angle is in the range of 20 degrees to 45 degrees.

  The liquid collecting piece 11 is extended to the lowermost parts 5A and 6A of the lower side 5b and 6b in the longitudinal direction of at least one of the rectangular dust collecting electrode plate 5 and the dust collecting counter electrode plate 6. . Therefore, the liquid dust collector CL collected on the dust collecting electrode plate 5 and the dust collecting counter electrode plate 6 flows on the dust collecting electrode plate 5 and the dust collecting counter electrode plate 6, and one of them is collected. Since the liquid collecting piece 11 extending to the lowermost parts 5A and 6A of the lower sides 5b and 6b in the longitudinal direction is collected and dropped, any of the liquid collecting piece 11, the dust collecting electrode plate 5, and the dust collecting counter electrode plate 6 As a result, an abnormal discharge can be prevented without lowering the insulation resistance between the dust collecting electrode plate 5 and the dust collecting counter electrode plate 6.

  There is no particular limitation on the shape and size of the liquid collecting piece 11, and it is desirable that the surface be subjected to a known treatment that lowers the surface tension of the liquid dust collection CL, and the treatment is performed. If it exists, the liquid dust collection body CL will fall smoothly from the liquid assembly piece 11. FIG. This process may be performed on the entire plate surface 6a of the dust collection counter electrode plate 6, and the liquid dust collection CL flows smoothly on the plate surface 6a.

  Usually, when airborne particles are water or oil, most of the dust is collected on the dust collection counter electrode plate 6, so that the liquid collecting piece 11 has a lower side 6 b in the longitudinal direction of the dust collection counter electrode plate 6. Only the lowermost part 6A is extended. Accordingly, the liquid dust collection CL collected on the dust collection counter electrode plate 6 flows on the dust collection counter electrode plate 6 and collects and falls on the liquid collection piece 11 on the lower side 6b in the longitudinal direction. The state where the distance between the collecting piece 11 and the dust collecting electrode plate 5 is kept large is maintained. As a result, the insulation resistance between the dust collecting electrode plate 5 and the dust collecting electrode plate 6 is not lowered, and abnormal discharge is extremely suppressed. Can be effectively prevented.

  The power source 8 supplies necessary voltage and current to the ionization unit 4 and the dust collection unit 7 of the electrostatic precipitator 1, and is not particularly limited as long as these conditions can be satisfied. In FIG. 1, reference numeral 12 denotes a switch for turning on / off the connection between the power supply 8 and the ionization unit 4 and the dust collection unit 7.

  The power source 8 applies a predetermined voltage to the constant current control unit 13 that sends a constant current to the ionization unit 4 but does not exceed the set voltage, and the dust collection unit 7, and the applied voltage value and the current value are rapidly increased. A voltage stage control unit 15 that includes a detection unit 14 that detects abnormal discharge that causes fluctuations, and that issues a command to change the predetermined voltage to the dust collection unit 7 based on the abnormal discharge information from the detection unit 14 until the stage does not cause abnormal discharge; A voltage change unit 16 that changes a predetermined voltage in response to a voltage change command from the voltage stage control unit 15 is added.

  As a result, a constant current is sent from the power source 8 to the ionization unit 4 by the constant current control unit 13, and a predetermined voltage is applied to the dust collection unit 7 from the power source 8 by the voltage step control unit 15. When this occurs, the voltage stage control unit 15 temporarily shuts off the power supply 8 and the dust collection unit 7, and then the voltage change unit 16 changes the voltage to a predetermined voltage at which no abnormal discharge occurs and applies it to the dust collection unit 7. Dust collection will continue after the occurrence of discharge.

  The constant current control unit 13 is for sending a constant current from the power source 8 to the ionization line 2 of the ionization unit 4, for example, a constant current within a range of 0.3 to 2.0 mA. The voltage is in the range of 7000 to 8000V. However, since the constant current control unit 13 sends a constant current within the range of 0.3 to 2.0 mA, a voltage that significantly deviates from a voltage of 7000 to 8000 V, for example, 10000 V or more. It has a known function to prevent this.

  The voltage stage control unit 15 issues a command for applying a predetermined voltage, for example, a predetermined voltage within a range of 1500 to 4500 V, from the power source 8 to the dust collecting electrode plate 5 of the dust collecting unit 7. The current is in the range of 0.05 to 0.1 mA. Furthermore, the detection unit 14 detects an abnormal discharge that causes a sudden change in the voltage value and current value applied to the dust collection unit 7. For example, the voltage value of the dust collection unit 7 is 4000V. When a normal electric field is formed at a current value of 0.1 mA, the environment of the dust collecting portion 7 fluctuates suddenly for some reason, a voltage value of 2500 to 3000 V, and a current value of 0.2 mA suddenly. It detects abnormal discharge that fluctuates.

  And when this detection part 14 detects the said abnormal discharge of the dust collection part 7, the voltage stage control part 15 will receive the abnormal discharge information, and the voltage stage control part 15 which received the abnormal discharge information will be the dust collection part. 7 and the power supply 8 are once cut off by the switch 12, and then the abnormal voltage can be avoided if the predetermined voltage applied to the dust collecting unit 7 is lowered with respect to the voltage changing unit 16, and the abnormal discharge is not caused. The voltage changing unit 16 that transmits a command to change the predetermined voltage until the level is received, and the voltage changing unit 16 that has received the voltage changing command changes the voltage to a level of 3800 V by reducing 200 V from the predetermined voltage at the stage where abnormal discharge does not occur. Hereinafter, when an abnormal discharge occurs again in the dust collecting section 4, it is dealt with by sequentially lowering the predetermined voltage in the above-described procedure.

  The change of the predetermined voltage by the voltage stage control unit 15 and the voltage change unit 16 is performed in advance by the CPU 20 of the voltage stage control unit 15 that has received the abnormal discharge information and the received abnormal discharge information in advance as shown in FIG. In contrast to the stored information, a predetermined voltage at a stage where abnormal discharge does not occur in the dust collection unit 7 is determined, and a voltage change command is transmitted to the amplifier circuit 21 as a PWM (pulse width modulation) signal. Then, a predetermined voltage along the PWM signal described above is applied to the dust collecting unit 7 through the voltage changing unit 16 including the amplifier circuit 21, the step-up transformer 22 and the step-up circuit 23 that have received the PWM signal.

  Further, the change of the predetermined voltage by the voltage stage control unit 15A and the voltage change unit 16A may be, for example, as shown in FIG. That is, the voltage stage control unit 15A instructs the voltage changing unit 16A having n resistors (R1 <R2... <Rn-1 <Rn) arranged in parallel between the dust collecting unit 7 and the power source 8. When the detection unit 14 detects an abnormal discharge when the resistor R1 is connected between the dust collection unit 7 and the power source 8, the dust collection unit 7 and the power source 8 are once cut off by the switch 12. Then, after switching to the resistor R2 having a large resistance value between the dust collecting unit 7 and the power source 8, a predetermined voltage at a stage where no abnormal discharge occurs is applied to the dust collecting unit 7, and even after abnormal discharge in the dust collecting unit 7. Normal dust collection is restored, and normal dust collection continues unless an abnormal discharge occurs again. Thereafter, the n-2 resistors R that have been installed are sequentially switched to the resistors R3 to Rn having a large resistance value, and the predetermined voltage is changed stepwise and applied to the dust collecting portion 7 so that it is collected even after abnormal discharge. The dust action can be continued.

  Note that the resistance values of the n resistors R are in the range of several MΩ, and R1 <R2... <Rn−1 <Rn. The quantity of the resistor R is not particularly limited, but 3 to 5 is an appropriate quantity.

Below, the effect | action of the electrostatic precipitator 1 which becomes the said structure is explained in full detail.
First, in a state where the power source 5 is turned on, when air containing suspended particles such as water and oil enters the ionization unit 4 of the electrostatic precipitator 1 from the direction of the arrow K in FIG. 2 and the ionized electrode 3 are charged by floating particles in the air by corona discharge or the like. As the operation of the electrostatic precipitator 1 continues, if the surface of the ionization wire 2 is not higher than the initial applied voltage due to contamination or oxidation, it is difficult to stably generate corona discharge or the like. Since a constant current, for example, a constant current within a range of 0.3 to 2.0 mA is sent from the power source 8 by the constant current control unit 13 to the ionization line 2, dirt, oxidation, etc. Can be effectively accommodated at a voltage higher than the initial applied voltage, corona discharge and the like are stably generated, and there is no decrease in charging ability with respect to the suspended particles in the ionization unit 4. There will be no decrease in dust collection efficiency due to the effects of dirt and oxidation.

  Further, when air containing suspended particles such as charged water or oil enters the dust collecting portion 7, a predetermined voltage is applied between the dust collecting electrode plate 5 and the dust collecting counter electrode plate 6 of the dust collecting portion 7. By applying the electric field, the charged floating particles are collected by the dust collecting electrode plate 5 or the dust collecting counter electrode plate 6 by the Coulomb force, and the clean air after dust collection is collected from the dust collecting portion 7. Will be discharged. Airborne particles such as water and oil are mainly collected on the dust collection counter electrode plate 6 to form a liquid dust collection CL. This liquid dust collection CL is separated by gravity as shown in FIG. It flows while growing toward the lowermost part 6A of the lower side 6b in the longitudinal direction of the electrode plate 6 and finally gathers in the liquid collecting piece 11 and finally falls, so the liquid collecting piece 11 and the dust collecting electrode plate 5 The state where the distance is greatly separated can be maintained, and as a result, the insulation resistance between the dust collecting electrode plate 5 and the dust collecting electrode plate 6 is not lowered, and abnormal discharge can be prevented.

  However, when abnormal discharge such as spark discharge occurs due to environmental fluctuations between the dust collection electrode plate 5 and the dust collection electrode plate 6 due to accumulation of suspended particles, etc., due to continuous operation of the electric dust collector 1 over a long period of time, In addition to being able to maintain a high electric field between the electrode plate 5 and the dust collection counter electrode plate 6, it is driven into a situation where even a predetermined voltage cannot be applied. However, the dust collecting electrode plate 5 of the dust collecting unit 7 temporarily cuts off the predetermined voltage applied from the power source 8 by the voltage stage control unit 15 and the voltage changing unit 16, and then changes the predetermined voltage stepwise. Although the abnormal discharge is temporarily stopped and then a high electric field is generated again, the dust collection efficiency slightly decreases even after the abnormal discharge occurs between the dust collection electrode plate 5 and the dust collection counter electrode plate 6, Since the dust collecting operation is continued, it is possible to extend a maintenance interval such as cleaning of the dust collecting unit 7.

  While the first embodiment of the present invention has been described above, it should be understood that the specific configuration is not limited to this, and that modifications can be made as appropriate without departing from the scope of the present invention.

  The electric dust collector of the present invention quickly removes liquid dust collected from the dust collecting part without using a mechanical filter, maintains an appropriate insulation resistance and prevents abnormal discharge from occurring in the dust collecting part, Even if an abnormal discharge occurs, when the normal electric field formation is promptly resumed and the dust collecting action is to be continued, the availability becomes extremely high.

DESCRIPTION OF SYMBOLS 1 Electric dust collector 2, 50 Ionization line 3, 51 Ionization electrode 4, 52 Ionization part 5, 53 Dust collection electrode plate 5A, 6A Bottom 5a, 6a Plate surface 5b, 6b Longitudinal lower side 6, 54 Dust collection counter electrode Plates 7, 55 Dust collectors 8, 56 Power supply 8a Positive pole 8b Negative pole 10 High resistance 11 Liquid collecting piece 12 Switch 13 Constant current control unit 14 Detection unit 15, 15A Voltage step control unit 16, 16A Voltage change unit 20 CPU
21 amplifying circuit 22 step-up transformer 23 step-up circuit 57 controller CL liquid dust HP horizontal plane R, R1-Rn resistance α inclination angle

Claims (5)

  Alternating ionization sections with ionization lines and ionization electrodes for charging suspended particles in the air by corona discharge, etc., and dust collecting electrode plates and dust collecting counter electrode plates for collecting charged floating particles by Coulomb force In the electrostatic precipitator, the dust collecting electrode plate and the dust collecting electrode are arranged in a space and arranged at equal intervals with spacers, and a power source for supplying power to the ionization unit and the dust collecting unit. A dust counter electrode plate is formed in a rectangular shape, and the rectangular dust collector electrode plate and the dust collector counter electrode plate are disposed so that their plate surfaces are vertical, The dust collection electrode plate and the dust collection counter electrode plate are inclined with respect to a horizontal plane, and liquid dust collection after dust collection is performed at the bottom of the lower side in the longitudinal direction of the dust collection electrode plate and the dust collection counter electrode plate. To collect things Electrostatic precipitator and butterflies.   The electrostatic precipitator according to claim 1, wherein an inclination angle α of the rectangular dust collector electrode plate and the dust collector counter electrode plate with respect to a horizontal plane is in a range of 15 degrees to 75 degrees.   The electric dust collector according to claim 1 or 2, wherein a liquid collecting piece is extended at a lowermost part of a lower side in the longitudinal direction of at least one of the rectangular dust collecting electrode plate and the dust collecting counter electrode plate.   The electrostatic precipitator according to claim 1 or 2, wherein a liquid collecting piece is provided only at the lowermost part of the lower side in the longitudinal direction of the rectangular dust collecting counter electrode plate.   A constant current control unit that sends a constant current to the ionization unit but does not exceed a set voltage to the power source, and an abnormal discharge that applies a predetermined voltage to the dust collection unit and causes sudden fluctuations in the applied voltage value and current value A voltage stage control unit that issues a command to change the predetermined voltage until the stage where no abnormal discharge occurs to the dust collecting unit based on abnormal discharge information from the detection unit, and a voltage from the voltage stage control unit A voltage changing unit that changes a predetermined voltage according to a change command, a constant current is sent from the power source to the ionization unit by the constant current control unit, and the voltage step control from the power source to the dust collecting unit When a predetermined voltage is applied by the unit and abnormal discharge occurs in the dust collection unit, the voltage step control unit temporarily shuts off the power source and the dust collection unit, and then the voltage change unit generates abnormal discharge. Not changed to a predetermined voltage is applied to the dust collecting part, abnormal discharge claims 1 was to continue the dust collecting effect even after generation to electrostatic precipitator according to item 1 of the four.

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