JP2018126714A - Electrostatic precipitator and blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic precipitator capable of suppressing the reduction of a dust collection function caused by the adhesion of a deposit to an electrode due to a discharge operation.SOLUTION: In the control section of an electrostatic precipitator, control for stopping the application of a voltage to a discharge electrode is performed when the quantity of particulate materials in air to be a treatment object becomes a predetermined lower limit reference value or less in a state of being applied with a voltage having a predetermined voltage value to the discharge electrode on the basis of the detection result of a particle sensor detecting the quantity of the particulate materials in the air to be treatment object; control for applying a voltage having a predetermined voltage value to the discharge electrode is performed when the quantity of particulate materials in the air to be the treatment object becomes a predetermined higher limit reference value or more in a state of being stopped with the application of a voltage to the discharge electrode; and control for applying a predetermined voltage value to the discharge electrode is performed after a voltage higher than a predetermined voltage value is applied to the discharge electrode when starting the operation of a charging section.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electrostatic precipitator and a blower provided with the electrostatic precipitator.

  In recent years, air cleaners that remove particulate matter indoors have been used to mitigate the effects of pollen such as cedar or cypress and particulate matter in the air, such as particulate matter (PM), on the human body. It is used. Hereinafter, the particulate material may be simply referred to as a fine particle. As a method of removing fine particles in an air cleaner, a method of mechanically removing fine particles using a filter and a method of electrically removing fine particles by releasing ions or the like are used.

  Further, as a method for electrically removing fine particles, an electrostatic dust collection technique using corona discharge is used. An air cleaner using an electric dust collection technology includes a charging unit that gives electric charge to fine particles, and a dust collecting unit that traps charged fine particles. Then, the fine particles charged by the charging unit are captured by the dust collecting unit by the Coulomb force, so that the air containing the fine particles becomes clean air that does not contain the fine particles and is discharged into the space.

  As such an air purifier, Patent Document 1 discloses an air purifying device that purifies air using corona discharge. The air purification device disclosed in Patent Literature 1 collects dust and deodorizes in space by active species such as electrons, ions, ozone, and radicals generated by applying a voltage between a discharge electrode and a counter electrode. be able to.

  Further, Patent Document 2 includes a particle measuring device that measures the number of fine particles in the air, and in accordance with the detection result of the number of fine particles, a high voltage that creates an electric field that moves and collects dust by applying electric charges to the dust. An air purifier for controlling a power supply is disclosed.

Japanese Patent No. 3775417 Japanese Patent No. 3107277

However, according to the technique disclosed in Patent Document 1, when corona discharge is performed indoors, a volatile silicon compound present in the air is oxidized to produce silica (SiO ₂ ), which is an insulator, and the discharge electrode. Adhere to the tip. And silica accumulates on the front-end | tip of a discharge electrode as the usage time of an air cleaner increases. When silica, which is a deposit, adheres to the tip of the discharge electrode, the silica becomes a resistance and the discharge at the discharge electrode is hindered, leading to a decrease in the amount of charge released and the amount of active species generated, and the efficiency of charging fine particles is improved. descend. Such a decrease in efficiency becomes more prominent as silica is deposited on the tip of the discharge electrode. For this reason, there existed a problem that the air purifying function of an air purifier fell gradually by operating an air purifier for a long period of time.

  Further, in Patent Document 2, output control of a high voltage power source is performed in accordance with the detection result of the number of particles of fine particles, but silica adhesion to the discharge electrode is not taken into consideration at all, and an air cleaner is lengthened. There was a problem that the air purifying function of the air purifier gradually deteriorated by operating for a period of time.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the electric dust collector and air blower which can suppress the fall of the dust collection function resulting from adhesion of the deposit | attachment to the electrode by discharge operation.

  In order to solve the above-described problems and achieve the object, an electrostatic precipitator according to the present invention includes a particle sensor for detecting the quantity of particulate matter in the air to be processed, and a counter electrode having a ground potential. And a discharge portion that is opposed to the counter electrode, and a charging unit that charges the particulate matter in the air by generating a corona discharge between the discharge electrode and the counter electrode by applying a voltage to the discharge electrode; Is provided. In addition, the electrostatic precipitator controls the dust collection unit that collects the particulate matter charged in the charging unit by Coulomb force, the power source that applies voltage to the discharge electrode, and the application of voltage from the power source to the discharge electrode. A control unit. Based on the detection result of the particle sensor, the control unit determines that the number of particulate matter in the air to be processed is equal to or less than the predetermined lower reference value when the voltage of the predetermined voltage value is applied to the discharge electrode. When the voltage applied to the discharge electrode is stopped and the voltage application to the discharge electrode is stopped, the quantity of particulate matter in the air to be treated is the predetermined upper limit standard. When the value exceeds the value, control is performed to apply a voltage having a predetermined voltage value to the discharge electrode. In addition, the control unit performs control to apply a predetermined voltage value to the discharge electrode after applying a voltage higher than the predetermined voltage value to the discharge electrode at the start of operation of the charging unit.

  Advantageous Effects of Invention According to the present invention, there is an effect that an electric dust collector capable of suppressing a decrease in dust collection function due to adhesion of deposits to electrodes due to a discharge operation can be obtained.

The schematic diagram which shows schematic structure of the electric dust collector concerning Embodiment 1 of this invention. Functional block diagram of the principal part in connection with control of the electric dust collector concerning Embodiment 1 of this invention The figure which shows an example of the hardware constitutions of the processing circuit concerning Embodiment 1 of this invention. The schematic diagram which shows arrangement | positioning structure of the dust collection part high voltage electrode and dust collection part counter electrode in the electric dust collector concerning Embodiment 1 of this invention. The schematic diagram which shows the other arrangement structure of the dust collection part high voltage electrode and dust collection part counter electrode in the electric dust collector concerning Embodiment 1 of this invention. The flowchart which shows the procedure of the dust collection operation | movement in the electric dust collector concerning Embodiment 1 of this invention. The flowchart which shows the other procedure of the dust collection operation | movement in the electric dust collector concerning Embodiment 1 of this invention. The characteristic view which shows the waveform of the voltage applied to the charged part discharge electrode when the dust collection operation | movement of the electrostatic precipitator concerning Embodiment 1 of this invention is performed in the procedure of the flowchart shown in FIG. The schematic diagram which shows schematic structure of the air blower concerning Embodiment 2 of this invention. The principal part schematic diagram which shows the other schematic structure of the air blower concerning Embodiment 2 of this invention.

  Hereinafter, an electric dust collector and a blower according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram illustrating a schematic configuration of an electrostatic precipitator 1 according to a first embodiment of the present invention. As shown in FIG. 1, a charging unit 2, a dust collection unit 3, a particulate sensor 11, and a control unit 12 are provided. The charging unit 2 includes a high voltage power source 6, a charging unit discharge electrode 7 and a charging unit counter electrode 8, and charges fine particles contained in the contaminated air 4 flowing into the charging unit 2. The dust collection unit 3 includes a high voltage power source 6, a dust collection unit high-voltage electrode 9, and a dust collection unit counter electrode 10, and a Coulomb force from an electric field formed by the dust collection unit high-voltage electrode 9 and the dust collection unit counter electrode 10. Thus, the charged fine particles are captured by the charging unit 2. Then, the contaminated air 4 in which the fine particles are captured in the dust collecting unit 3 is discharged as clean air 5 to the outside of the dust collecting unit.

  The high voltage power source 6 applies a DC voltage, an AC voltage, or a pulsed voltage to the charging unit 2 and the dust collecting unit 3, and between the charging unit discharge electrode 7 and the charging unit counter electrode 8, and This is a power source for applying a potential difference between the dust collector high voltage electrode 9 and the dust collector counter electrode 10. The high voltage power supply 6 applies a voltage to the charged part discharge electrode 7 of the charging part 2 to generate a potential difference between the charged part discharge electrode 7 and the charged part counter electrode 8. The high voltage power source 6 applies a voltage to the dust collector high voltage electrode 9 of the dust collector 3 to generate a potential difference between the dust collector high voltage electrode 9 and the dust collector counter electrode 10, thereby collecting the dust. An electrostatic field is formed between the part high voltage electrode 9 and the dust collecting part counter electrode 10.

  The polarity of the voltage applied by the high voltage power supply 6 to the charged portion discharge electrode 7 or the dust collector high voltage electrode 9 may be appropriately selected according to the application of the electric dust collector 1. In addition, by applying a positive voltage to the charged portion discharge electrode 7, the concentration of ozone generated by the discharge generated at the charged portion discharge electrode 7 can be lowered. For this reason, it is preferable that the voltage applied to the charged part discharge electrode 7 is a positive voltage. Here, the high voltage power source 6 is configured to be connected in common to both the charging unit 2 and the dust collecting unit 3, but separate high voltage power sources 6 are connected to the charging unit 2 and the dust collecting unit 3. It is good also as a connected structure.

  The charged part discharge electrode 7 is composed of a metal plate, a wire line or a ribbon line having protrusions at regular intervals in the plane. The charged part discharge electrode 7 is opposed to the charged part counter electrode 8 with a predetermined interval, and is parallel to the ventilation direction of the contaminated air 4, that is, parallel to the direction of the contaminated air 4 flowing into the charged part 2. It is arranged in the state that was done. When the charged part discharge electrode 7 is formed of a metal plate, the charged part discharge electrode 7 is arranged in a state where the in-plane direction of the metal plate is parallel to the direction of the flow of the contaminated air 4 flowing into the charged part 2. When the charged part discharge electrode 7 is composed of a wire line or a ribbon line, the charged part discharge electrode 7 is arranged in a state where the longitudinal direction of the wire line or the ribbon line is parallel to the flow direction of the contaminated air 4 flowing into the charged part 2. The

  The charged part discharge electrode 7 is fixed to the housing of the electric dust collector 1 (not shown) via a connecting member such as a metal plate or an elastic metal spring. The base material of the charged portion discharge electrode 7 may be appropriately selected from conductive materials such as stainless steel, tungsten, titanium, and carbon materials. In addition, the charged portion discharge electrode 7 includes a base material made of an insulating material such as a conductive resin plated with a metal material such as gold, silver, platinum, and a base material made of metal with gold, silver, A metal resin such as platinum plated or a surface treatment with a clad material, or a conductive resin imparted with conductivity by a conductive material such as carbon may be used.

  The charged portion counter electrode 8 has a flat shape, is arranged at a predetermined interval from the charged portion discharge electrode 7, and forms an electric potential difference with the charged portion discharge electrode 7. It is connected to the ground of the high-voltage power supply 6 and has a ground potential, that is, 0V. The charged portion counter electrode 8 is opposed to the charged portion discharge electrode 7 with a predetermined interval, and is in-plane in the ventilation direction of the contaminated air 4, that is, in the direction of the flow of the contaminated air 4 flowing into the charged portion 2. Arranged in a state where the directions are parallel. The charging portion counter electrode 8 is fixed to the housing of the electric dust collector 1 (not shown) via a connecting member such as a metal plate or an extendable metal spring. The base material of the charged portion counter electrode 8 can be made of the same material as that of the charged portion discharge electrode 7.

  As shown in FIG. 1, a plurality of charged part discharge electrodes 7 and charged part counter electrodes 8 are alternately arranged in parallel with each other at regular intervals in a direction parallel to the ventilation direction of the contaminated air 4. The distance between the charged part discharge electrode 7 and the charged part counter electrode 8 may be about 5 mm to 10 mm. When the distance between the charged portion discharge electrode 7 and the charged portion counter electrode 8 is shorter than 5 mm, a spark discharge may occur when a discharge occurs between the charged portion discharge electrode 7 and the charged portion counter electrode 8. There is sex. In addition, when the distance between the charged part discharge electrode 7 and the charged part counter electrode 8 is longer than 10 mm, the applied voltage required to cause a constant current to flow through the charged part discharge electrode 7 increases, and the high voltage The power supply 6 having a large capacity and size is required, leading to an increase in the size of the apparatus.

  In addition, although the case where the number of the charged part discharge electrodes 7 is two and the number of the charged part counter electrodes 8 is three is shown here, the numbers of the charged part discharge electrodes 7 and the charged part counter electrodes 8 are these. It is not limited to quantity.

  The dust collector high-voltage electrode 9 has a flat plate shape and is an electrode that is applied with a voltage by the high-voltage power supply 6 to form an equal electric field with the dust collector counter electrode 10. The dust collector high-voltage electrode 9 is opposed to the dust collector counter electrode 10 at a predetermined interval, and the direction of air flow of the contaminated air 4, that is, the direction of the flow of the contaminated air 4 flowing into the dust collector 3. Are arranged in a state in which the in-plane direction is parallel. The base material of the dust collector high voltage electrode 9 can be made of the same material as the charged part discharge electrode 7. Note that the shape of the dust collector high-voltage electrode 9 is not limited to a flat plate shape as long as a uniform electric field can be formed between the dust collector and the counter electrode 10 to collect the fine particles.

The dust collector counter electrode 10 has a flat shape, is disposed at a predetermined interval from the dust collector high voltage electrode 9, and forms an equal electric field with the dust collector high voltage electrode 9. It is an electrode and is connected to the ground of the high-voltage power supply 6, and the potential is set to the ground potential, that is, 0V. The base material of the dust collection portion counter electrode 10 can be made of the same material as that of the charged portion discharge electrode 7. The base material of the dust collection portion counter electrode 10 may be the same material as the charged portion discharge electrode 7, but if the conductivity is too high, abnormal discharge occurs between the dust collection portion high voltage electrode 9 and the surface. It is preferable to use a semiconductive resin having a resistance in the range of 10 ⁵ Ω to 10 ¹³ Ω.

  As shown in FIG. 1, the dust collector high voltage electrode 9 and the dust collector counter electrode 10 are alternately arranged in parallel with each other at regular intervals in a direction parallel to the ventilation direction of the contaminated air 4. The The distance between the dust collector high voltage electrode 9 and the dust collector counter electrode 10 may be about 2 mm to 5 mm. When the distance between the dust collector high voltage electrode 9 and the dust collector counter electrode 10 is shorter than 2 mm, the pressure loss during ventilation of the contaminated air 4 becomes large, and the load of the blower for blowing the contaminated air 4 is increased. The target air volume may not be obtained due to the increase of. Moreover, when the distance between the dust collector high voltage electrode 9 and the dust collector counter electrode 10 is longer than 5 mm, the size of the electrostatic dust collector 1 becomes large, and there is a possibility that it cannot be incorporated into a device such as a blower. Moreover, the electric field strength between the dust collection part high voltage electrode 9 and the dust collection part counter electrode 10 falls, and the dust collection efficiency of the dust collection part 3 falls. Furthermore, the applied voltage required to form a predetermined electric field strength between the dust collector high voltage electrode 9 and the dust collector counter electrode 10 increases, which may cause problems in insulation and safety. .

  The particulate sensor 11 is a particle sensor that detects the number of particulates in the air to be processed, and detects the particulate quantity of the contaminated air 4. The fine particle sensor 11 detects the number of fine particles in the contaminated air 4 flowing into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8. The particulate sensor 11 can communicate with the control unit 12 and transmits the detection result of the number of particulates in the contaminated air 4 to the control unit 12. The fine particle sensor 11 may be a semiconductor laser type particle sensor that detects the number of particles in the air by irradiating a laser beam in the air and measuring the light receiving level of the laser light scattered by the fine particles. it can. The fine particle sensor 11 is not limited to this. The particle diameter of the fine particles measured by the fine particle sensor 11 is not particularly limited and may be appropriately selected depending on the specifications of the electrostatic precipitator 1. For example, a necessary particle diameter is selected in the range of 0.3 μm to 10 μm. That's fine.

  FIG. 2 is a functional configuration diagram of main parts related to the control of the electrostatic precipitator 1 according to the first embodiment of the present invention. The control unit 12 can communicate with the high voltage power supply 6 and the particle sensor 11 and controls application of voltage from the high voltage power supply 6 to the charged part discharge electrode 7 and the dust collecting part high voltage electrode 9. Then, the control unit 12 controls the application of a voltage from the high voltage power supply 6 to the charged part discharge electrode 7 based on the detection result of the number of particles by the particle sensor 11.

  The control unit 12 is realized, for example, as a processing circuit having a hardware configuration illustrated in FIG. FIG. 3 is a diagram illustrating an example of a hardware configuration of the processing circuit according to the first embodiment of the present invention. When the control unit 12 is realized as a processing circuit having the hardware configuration illustrated in FIG. 3, the control unit 12, for example, executes a program stored in the memory 102 by the processor 101 illustrated in FIG. 3. Realized. A plurality of processors and a plurality of memories may cooperate to realize the above function. Further, a part of the function of the control unit 12 may be mounted as an electronic circuit, and the other part may be realized using the processor 101 and the memory 102.

  FIG. 4 is a schematic diagram showing an arrangement configuration of the dust collector high voltage electrode 9 and the dust collector counter electrode 10 in the electric dust collector 1 according to the first embodiment of the present invention. As shown in FIG. 4, the arrangement configuration of the dust collector high voltage electrode 9 and the dust collector counter electrode 10 described above is parallel to the ventilation direction of the contaminated air 4, and the charged portion discharge electrode 7 and the charged portion. It is configured to be arranged at a constant interval in a parallel direction to a plane parallel to the in-plane direction with the counter electrode 8.

  FIG. 5 is a schematic diagram showing another arrangement configuration of the dust collector high voltage electrode 9 and the dust collector counter electrode 10 in the electric dust collector 1 according to the first embodiment of the present invention. Further, as shown in FIG. 5, the arrangement configuration of the dust collector high voltage electrode 9 and the dust collector counter electrode 10 is parallel to the ventilation direction of the contaminated air 4, and the charged part discharge electrode 7 and the charged part. It may be configured to be arranged at a constant interval in a direction perpendicular to a plane parallel to the in-plane direction with the counter electrode 8. 4 and 5, as the charged portion discharge electrode 7, the charged portion discharge electrode 7 made of a metal plate having protrusions at regular intervals in the plane is shown. In addition, illustration of protrusion is abbreviate | omitted.

  In the actual usage mode, the above-described high voltage power supply 6, charged part discharge electrode 7, charged part counter electrode 8, dust collection part high voltage electrode 9, dust collection part counter electrode 10, particulate sensor 11 and control unit 12 are made of synthetic resin. Alternatively, it is fixed to the casing by a wind tunnel part or a support part (not shown) made of an arbitrary member such as metal. The wind tunnel component or the support component is not particularly limited, and may be appropriately selected according to the use of the electrostatic precipitator 1.

  Next, the dust collection operation of the electric dust collector 1 according to the first embodiment will be described. In the following, a case where a positive voltage is applied to the charged portion discharge electrode 7 and the dust collecting portion high voltage electrode 9 will be described. FIG. 6 is a flowchart showing the procedure of the dust collection operation in the electric dust collector 1 according to the first embodiment of the present invention.

  First, in a state in which the contaminated air 4 flows into the charging space between the charged portion discharge electrode 7 and the charged portion counter electrode 8, control is performed from the high voltage power supply 6 to each of the charged portion discharge electrode 7 and the charged portion counter electrode 8. When a predetermined voltage is applied by the control of the unit 12, a corona discharge is generated in the charge space and the charge is discharged from the charged unit discharge electrode 7, and the fine particles contained in the contaminated air 4 are charged by this charge and charged. . In addition, the control part 12 makes the voltage value applied to the charge part discharge electrode 7 the predetermined voltage value V1 at the time of performing normal dust collection operation | movement.

  The charged fine particles ride on the flow of the contaminated air 4 and flow to the dust collection unit 3 and move to the dust collection space between the dust collection unit high-voltage electrode 9 and the dust collection unit counter electrode 10. An electrostatic field is formed in the dust collection space by applying a voltage to the dust collector high voltage electrode 9. For this reason, the charged fine particles are moved in the direction of the surface of the dust collection unit high-voltage electrode 9 by the Coulomb force or in the direction of the surface of the dust collection unit counter-electrode 10 to move to the dust collection unit high-voltage electrode 9 or the dust collection unit counter-electrode. 10 is adsorbed. Thereby, the particulates are removed from the contaminated air 4, and the contaminated air 4 flowing into the dust collecting unit 3 is changed to clean air 5 and discharged to the outside of the dust collecting unit. As a result, the air around the electrostatic precipitator 1 circulates and is sucked into the electrostatic precipitator 1 to collect fine particles in the air.

  When the dust collecting operation of the electrostatic precipitator 1 described above is started, in step S10, the particulate sensor 11 flows into the charging space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 every predetermined fixed time. The number of fine particles in the contaminated air 4 is detected, and the detection result is transmitted to the control unit 12. The predetermined fixed time is stored in advance in the particle sensor 11 and can be appropriately changed according to the specifications of the electrostatic precipitator 1.

  When the control unit 12 receives the detection result of the number of particulates in the contaminated air 4, the number of particulates in the contaminated air 4 is set to the first lower limit based on the detection result and the predetermined first lower limit reference value P1 in step S20. It is determined whether or not the reference value P1 has been reached. The first lower limit reference value P1 is the value of the number of fine particles in the contaminated air 4 when the number of fine particles in the surrounding air is reduced to a state where dust collection is not necessary by the dust collecting operation in the electric dust collector 1. It is. The first lower limit reference value P1 is the number of fine particles in the surrounding air serving as a reference when the control unit 12 performs control to stop the application of voltage from the high voltage power supply 6 to the charged portion discharge electrode 7. . The first lower limit reference value P1 is stored in the control unit 12 in advance, and can be changed as appropriate according to the specifications of the electrostatic precipitator 1.

  If the number of fine particles in the contaminated air 4 is larger than the first lower limit reference value P1, that is, if No in step S20, the control unit 12 returns to step S20 and repeats the process.

  When the number of fine particles in the contaminated air 4 is equal to or less than the first lower limit reference value P1, that is, when the result is Yes in step S20, the controller 12 causes the charged part discharge electrode to stop the charging operation in the charging part 2. 7 is transmitted to the high voltage power supply 6 to control the voltage application from the high voltage power supply 6 to the charged portion discharge electrode 7. Here, the control unit 12 is a control signal indicating that the voltage value applied to the charged part discharge electrode 7 is 0 V, that is, a stop instruction for stopping the application of voltage from the high voltage power supply 6 to the charged part discharge electrode 7. The signal is transmitted to the high voltage power supply 6.

  Note that the control unit 12 can also control the voltage applied to the charged part discharge electrode 7 to a low voltage in a range where no corona discharge occurs in order to stop the charging operation in the charging unit 2. However, from the viewpoint of power consumption, the control unit 12 preferably performs control to set the voltage value applied to the charged portion discharge electrode 7 to 0V.

  When receiving the stop instruction signal, the high voltage power supply 6 sets the voltage value applied to the charged part discharge electrode 7 to 0 V based on the stop instruction signal, and stops the application of the voltage to the charged part discharge electrode 7 in step S30. . The control unit 12 stops application of voltage from the high voltage power source 6 to the dust collection unit high voltage electrode 9 when performing control to stop application of voltage from the high voltage power source 6 to the charging unit discharge electrode 7. Control may be performed simultaneously. Thereby, the application of the voltage to the dust collection part high voltage electrode 9 is stopped while the application of the voltage to the charged part discharge electrode 7 is stopped, and the power can be reduced.

  If the application of voltage to the charged part discharge electrode 7 is stopped and the dust collection operation of the electrostatic precipitator 1 is not performed, the number of fine particles in the air around the electrostatic precipitator 1 increases due to the intrusion of outside air. Therefore, in step S40, the fine particle sensor 11 detects the number of fine particles in the contaminated air 4 flowing into the charging space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 at predetermined intervals, and controls the detection result. To the unit 12.

  When the control unit 12 receives the detection result of the number of particles in the contaminated air 4, the number of particles in the contaminated air 4 becomes equal to or greater than the upper limit reference value based on the detection result and the predetermined upper limit reference value in step S50. It is determined whether or not. The upper reference value is the value of the number of fine particles in the contaminated air 4 when the number of fine particles in the surrounding air has increased to a state where dust collection is necessary, and the control unit 12 is a charged portion from the high voltage power source 6. This is the number of fine particles in the surrounding air that serves as a reference when starting control of voltage application to the discharge electrode 7. The upper limit reference value is stored in advance in the control unit 12 and can be changed as appropriate according to the specifications of the electrostatic precipitator 1.

  If the number of fine particles in the contaminated air 4 is less than the upper limit reference value, that is, if No in step S50, the control unit 12 returns to step S50 and repeats the process.

  When the number of fine particles in the contaminated air 4 is equal to or greater than the upper limit reference value, that is, when the result is Yes in step S50, the control unit 12 sends a control signal for controlling the application of voltage to the charged part discharge electrode 7 to the high voltage power supply. 6 to control the application of voltage from the high voltage power supply 6 to the charged portion discharge electrode 7. Here, the control unit 12 is a control signal indicating that the voltage value applied to the charged part discharge electrode 7 is a predetermined voltage value V1 when the normal dust collection operation is performed, that is, the charged part discharge from the high voltage power supply 6. An operation start instruction signal for starting the operation of the charging unit 2 by applying a voltage to the electrode 7 is transmitted to the high voltage power supply 6.

  When the high voltage power supply 6 receives the operation start instruction signal, in step S60, the voltage value applied to the charged part discharge electrode 7 is set to the voltage value V1 based on the operation start instruction signal, and the voltage is applied to the charged part discharge electrode 7. Then, the operation of the charging unit 2 is started. Thereby, since removal of fine particles is started in the electrostatic precipitator 1, the number of fine particles in the air around the electrostatic precipitator 1 can be reduced. The control unit 12 applies the voltage from the high voltage power source 6 to the charged part discharge electrode 7 to start the operation of the charging unit 2, from the high voltage power source 6 to the dust collecting unit high voltage electrode 9. The control for starting the application of the voltage is simultaneously performed.

  Thereafter, the process returns to step S10 and the above-described processing is repeated.

  When the corona discharge is performed in the charged space as described above, the volatile silicon compound present in the air is oxidized to produce silica as an insulator, and adheres to the tip of the charged portion discharge electrode 7. Here, the tip of the charged portion discharge electrode 7 is the tip of the protrusion when the charged portion discharge electrode 7 is formed of a metal plate having protrusions at regular intervals in the plane. When the charged portion discharge electrode 7 is composed of a wire line or a ribbon line, it is a leading end portion of the wire line or ribbon line that is not connected to the high voltage power source 6 and that generates a corona discharge. .

  The amount of silica adhering to the tip of the charged portion discharge electrode 7 increases in proportion to the time during which corona discharge is performed, that is, the time during which voltage is applied from the high voltage power supply 6 to the charged portion discharge electrode 7. For this reason, when a voltage is constantly applied from the high voltage power source 6 to the charged portion discharge electrode 7 to generate a corona discharge in the charging space, the voltage is applied to the charged portion discharge electrode 7 in proportion to the application time. The amount of silica adhering to the tip of the charged portion discharge electrode 7 increases.

  On the other hand, in the electrostatic precipitator 1, as described above, when the number of fine particles in the air is reduced by the dust collecting operation in the electrostatic precipitator 1, and there is no need for dust collection, the control unit 12 Therefore, the application of voltage to the charged portion discharge electrode 7 is stopped, so that unnecessary corona discharge can be prevented and the amount of silica adhering to the charged portion discharge electrode 7 can be reduced. That is, in the electrostatic precipitator 1, since the accumulated time of the generation time of the corona discharge can be shortened while ensuring a certain dust collection performance, the deposition rate of silica on the charged portion discharge electrode 7 in a certain period. Can be reduced.

  In the electrostatic precipitator 1, after the application of voltage to the charged part discharge electrode 7 is stopped and the dust collecting operation of the electrostatic precipitator 1 is stopped, fine particles in the air around the electrostatic precipitator 1. When the number increases to the upper limit reference value or more, a voltage is applied to the charged portion discharge electrode 7 by the control unit 12 and the dust collecting operation of the electrostatic precipitator 1 is resumed. That is, in the electrostatic precipitator 1, the control unit 12 performs the dust collecting operation of the electrostatic precipitator 1 based on the detection result of the number of fine particles in the contaminated air 4, the first lower limit reference value, and the upper limit reference value. And the stop of the dust collection operation of the electrostatic precipitator 1 are alternately and periodically repeated.

  Thereby, in the electric dust collector 1, the dust collection operation | movement with respect to the air around the electric dust collector 1 can be performed as needed, and the unnecessary dust collection operation | movement unnecessary can be deleted. Therefore, since the time for applying a voltage to the charged part discharge electrode 7 can be shortened and the deposition rate of silica on the charged part discharge electrode 7 can be reduced compared with the case where the dust collecting operation is always performed, the charged part discharge A decrease in the dust collection function of the electrostatic precipitator 1 due to the adhesion of silica to the electrode 7 can be suppressed, and a long life of the dust collection function can be realized.

  Further, as the applied voltage value applied to the charged portion discharge electrode 7 is increased, the number of fine particles removed by the electrostatic precipitator 1 per unit time increases, and the amount of reduction in the number of fine particles in the air increases. On the other hand, the lower the applied voltage value applied to the charged portion discharge electrode 7 in the range where corona discharge occurs, the smaller the number of particles removed by the electrostatic precipitator 1 per unit time, and the smaller the number of particles in the air. Decrease amount decreases. Here, the amount of silica attached to the charged portion discharge electrode 7 per unit time increases as the voltage value applied to the charged portion discharge electrode 7 increases.

  Therefore, in the electrostatic precipitator 1, the voltage value applied to the charged portion discharge electrode 7 may be changed stepwise according to the number of fine particles in the air. That is, in an environment where the number of fine particles in the air around the electrostatic precipitator 1 is large, the applied voltage value applied to the charged portion discharge electrode 7 is increased, and the fine particles removed by the electrostatic precipitator 1 per unit time. Increase the number to increase the decrease in the number of particles in the air. Further, in an environment where the number of fine particles in the air around the electrostatic precipitator 1 is small, the applied voltage value applied to the charged portion discharge electrode 7 is lowered within a range where corona discharge occurs, and the electrostatic precipitator is collected per unit time. The number of fine particles removed by the apparatus 1 is reduced, and the amount of decrease in the number of fine particles in the air is reduced. And the adhesion amount of the silica to the charged part discharge electrode 7 per unit time can be reduced by making the applied voltage value applied to the charged part discharge electrode 7 low.

  Hereinafter, control in the case where the voltage value applied to the charged portion discharge electrode 7 is changed to a stepped voltage waveform according to the number of fine particles in the air will be described. FIG. 7 is a flowchart showing another procedure of the dust collecting operation in the electric dust collector 1 according to the first embodiment of the present invention.

  First, in the same manner as described above, a predetermined voltage is applied from the high voltage power source 6 to each of the charged part discharge electrode 7 and the charged part counter electrode 8 by the control of the control unit 12, and the dust collecting operation in the electrostatic precipitator 1 is performed. Is started. In addition, the control part 12 makes the voltage value applied to the charge part discharge electrode 7 the predetermined voltage value V1 at the time of performing normal dust collection operation | movement.

  When the dust collection operation of the electrostatic precipitator 1 is started, in step S110, the particulate sensor 11 is contaminated air that flows into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 every predetermined fixed time. 4 is detected, and the detection result is transmitted to the control unit 12.

  When the control unit 12 receives the detection result of the number of particles in the contaminated air 4, the number of particles in the contaminated air 4 is set to the second lower limit based on the detection result and the predetermined second lower limit reference value P <b> 2 in step S <b> 120. It is determined whether or not the reference value P2 or less. The second lower limit reference value P2 is a dust collection operation by the electrostatic precipitator 1, and there is a need for dust collection, but the number of particulates in the surrounding air is reduced to an extremely small number of particulates in the air. It is the value of the number of fine particles in the contaminated air 4 at the time. The second lower limit reference value P2 is the number of fine particles in the surrounding air that serves as a reference when the control unit 12 performs control to reduce the application of voltage from the high voltage power supply 6 to the charged portion discharge electrode 7. . The second lower limit reference value P2 is stored in the control unit 12 in advance, and can be changed as appropriate according to the specifications of the electrostatic precipitator 1.

  If the number of fine particles in the contaminated air 4 is larger than the second lower limit reference value P2, that is, if No in step S120, the control unit 12 returns to step S120 and repeats the process.

  When the number of fine particles in the contaminated air 4 becomes equal to or smaller than the second lower limit reference value P2, that is, in the case of Yes in step S120, the control unit 12 outputs a control signal for controlling the application of voltage to the charged portion discharge electrode 7. It transmits to the high voltage power supply 6, and controls the application of the voltage from the high voltage power supply 6 to the charged part discharge electrode 7. FIG. Here, the control unit 12 sets the voltage value applied to the charged part discharge electrode 7 to a voltage value V2 that is lower than the voltage value V1 when performing a normal dust collection operation within a range where corona discharge occurs. Control signal, that is, an applied voltage reduction instruction signal for reducing the voltage applied from the high voltage power supply 6 to the charged portion discharge electrode 7 is transmitted to the high voltage power supply 6.

  When the high voltage power supply 6 receives the applied voltage reduction instruction signal, the voltage value applied to the charged part discharge electrode 7 based on the applied voltage reduction instruction signal is set to the voltage value V2 based on the applied voltage reduction instruction signal in step S130. The applied voltage value is reduced to the voltage value V2. Thereby, in the electrostatic precipitator 1, the charged part discharge per unit time and in a state where the number of fine particles removed per unit time is smaller than in the case where the voltage applied to the charged part discharge electrode 7 is the voltage value V1. The dust collection operation is performed with a small amount of silica adhering to the electrode 7. And the dust collection operation | movement is performed reducing the adhesion amount of the silica to the charged part discharge electrode 7 per unit time by making the applied voltage value applied to the charged part discharge electrode 7 low.

  Thereafter, steps S10 to S60 shown in the flowchart of FIG. 6 are performed. In addition, after implementation of step S60, it returns to step S110 and the process mentioned above is repeated.

  FIG. 8 shows the waveform of the voltage applied to the charged part discharge electrode 7 when the dust collection operation of the electrostatic precipitator 1 according to the first embodiment of the present invention is executed according to the procedure of the flowchart shown in FIG. FIG. In this case, the waveform of the voltage applied from the high voltage power source 6 to the charged portion discharge electrode 7 is a stepped voltage waveform as shown in FIG.

  As described above, in the electrostatic precipitator 1, execution of the dust collecting operation of the electrostatic precipitator 1 in which the voltage value applied to the charged portion discharge electrode 7 is changed to a stepped voltage waveform, and the electrostatic precipitator 1. Control of repeatedly stopping the dust collection operation alternately and irregularly according to the number of fine particles in the air may be performed. That is, the control unit 12 may perform control to stop the application of the voltage to the charged part discharge electrode 7 by stepping down the voltage applied to the charged part discharge electrode 7 in a plurality of stages. Also in this case, in the electrostatic precipitator 1, the dust collection operation | movement with respect to the air around the electrostatic precipitator 1 can be performed as needed, and unnecessary unnecessary dust collection operation | movement can be deleted. Therefore, since the time for applying a voltage to the charged part discharge electrode 7 can be shortened and the deposition rate of silica on the charged part discharge electrode 7 can be reduced compared with the case where the dust collecting operation is always performed, the charged part discharge A decrease in the dust collection function of the electrostatic precipitator 1 due to the adhesion of silica to the electrode 7 can be suppressed, and a long life of the dust collection function can be realized.

  Here, a case where the voltage value applied to the charged portion discharge electrode 7 is stepped down in two steps is shown, but the voltage value applied to the charged portion discharge electrode 7 may be stepped down through three or more steps.

  Moreover, in the control which raises the voltage of the charged part discharge electrode 7 for dust collection operation | movement in the control part 12 mentioned above, the system which applies a predetermined voltage always, or makes a predetermined electric current flow through the charging part 2 Therefore, a method of selecting and applying a voltage necessary for the purpose can be selected, but it may be appropriately selected according to the specifications required for the electrostatic precipitator 1. Further, in the control in the control unit 12 for stepping down the voltage applied to the charged part discharge electrode 7, when stopping the dust collection operation, 0 V, that is, the ground potential of the high voltage power source 6 is set per unit time. When performing a dust collection operation with a reduced number of fine particles to be removed, a predetermined voltage value may be appropriately selected within a range where corona discharge occurs.

  When corona discharge is generated in the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8, molecules in the charged space are ionized by the corona discharge, and the ionized molecules are directed toward the charged portion counter electrode 8. Flowing. This molecular flow forms an ionic wind. Therefore, when corona discharge is generated in the charging space between the charged portion discharge electrode 7 and the charged portion counter electrode 8, the surface of the charged portion counter electrode 8 facing the charged portion discharge electrode 7 from the tip of the charged portion discharge electrode 7 A strong ionic wind is generated toward

  Therefore, the control unit 12 applies the voltage to the charged part discharge electrode 7 and stops the application of the voltage to the charged part discharge electrode 7 in order to remove the silica adhering to the tip of the charged part discharge electrode 7 by the ion wind. Control to repeatedly reduce the voltage applied to the charged portion discharge electrode 7 is performed. Thereby, in the electric dust collector 1, the silica adhering to the front-end | tip of the charged part discharge electrode 7 by generation | occurrence | production of the dust collection operation | movement until now, ie, generation | occurrence | production of a corona discharge, can be blown away and removed by an ion wind. The silica deposited on the tip of the charged portion discharge electrode 7 can be reduced by repeating the above control and blowing off the silica adhering to the tip of the charged portion discharge electrode 7 with an ion wind.

  In this case, a stronger ion wind is generated as the boosted width of the charged portion discharge electrode 7 is larger. For this reason, from the viewpoint of blowing silica adhering to the tip of the charged portion discharge electrode 7 with ion wind, it is preferable that the boosted width of the charged portion discharge electrode 7 is large.

  Therefore, in the control shown in the flowchart of FIG. 6, it is preferable that the voltage value V1 when performing a normal dust collection operation is high. Then, in order to stop the charging operation in the charging unit 2, the effect is enhanced by controlling the voltage applied to the charging unit discharge electrode 7 to 0 V, that is, the ground potential in step S30. By controlling the voltage of the charged portion discharge electrode 7 to be stepped down in step S30 to 0 V, that is, the ground potential, the step-up width from the boosted potential of the charged portion discharge electrode 7 to the voltage value V1 can be increased. .

  Also in the control shown in the flowchart of FIG. 7, it is preferable that the voltage value V <b> 1 when performing a normal dust collecting operation is high. The voltage of the charged portion discharge electrode 7 to be stepped down in step S30 is preferably controlled to 0 V, that is, the ground potential.

  As an example of control for blowing silica adhering to the tip of the charged portion discharge electrode 7 by ion wind, the charged portion discharge electrode 7 is set for a predetermined time at the start of operation of the electrostatic precipitator 1, that is, at the start of operation of the charged portion 2. The control may be performed such that the voltage value to be applied to the voltage value V0 is higher than the voltage value V1 when the normal dust collection operation is performed, and then the above-described control may be performed. In this case, the amount of silica produced and attached to the charged portion discharge electrode 7 can be reduced while reducing the fine particles in the air. Furthermore, a stronger ion wind can be generated by applying a high voltage value V 0 to the charged portion discharge electrode 7 in the initial operation of the electrostatic precipitator 1. Thereby, the silica adhering to the front-end | tip of the charging part discharge electrode 7 can be blown away by a stronger ion wind, and can be removed.

  In the above description, a case where a positive voltage is applied to the charged portion discharge electrode 7 and the dust collector high voltage electrode 9 has been described. However, a negative electrode is applied to the charged portion discharge electrode 7 and dust collector high voltage electrode 9. In the case of applying a positive voltage, the absolute value of the voltage value may be set so as to match the above description.

  As described above, in the electrostatic precipitator 1 according to the first embodiment, the number of fine particles in the air is reduced by the dust collecting operation in the electrostatic precipitator 1, and there is no need for dust collection. The application of the voltage to the charged part discharge electrode 7 is stopped or reduced, and the generation of corona discharge in the charged space between the charged part discharge electrode 7 and the charged part counter electrode 8 is stopped. When the number of fine particles in the air around the electrostatic precipitator 1 increases to a state where dust collection is necessary, a voltage is applied to the charged portion discharge electrode 7 to collect the dust in the electrostatic precipitator 1. Operation resumes.

  That is, in the electrostatic precipitator 1, the execution of the dust collecting operation of the electrostatic precipitator 1 and the stop of the dust collecting operation of the electrostatic precipitator 1 are alternately repeated in a cycle. For this reason, in the electrostatic precipitator 1, the occurrence of unnecessary corona discharge in the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 is prevented, and the amount of silica adhering to the charged portion discharge electrode 7 is reduced. It is possible to reduce the adhesion rate of silica to the charged portion discharge electrode 7.

  Further, in the electrostatic precipitator 1, charging is performed by repeatedly applying a voltage to the charged portion discharge electrode 7 and stopping applying a voltage to the charged portion discharge electrode 7 or reducing the applied voltage to the charged portion discharge electrode 7. Silica adhering to the tip of the partial discharge electrode 7 can be removed by blowing away with ion wind.

  Therefore, according to the electric dust collector 1 concerning this Embodiment 1, the fall of the dust collection function of the electric dust collector 1 resulting from the adhesion of the silica to the charged part discharge electrode 7 is suppressed, and long-life of a dust collection function Therefore, it is possible to obtain an electrostatic precipitator that can suppress a decrease in the dust collecting function due to adhesion of deposits to the electrode due to discharge operation.

Embodiment 2. FIG.
FIG. 9 is a schematic diagram illustrating a schematic configuration of the blower 21 according to the second embodiment of the present invention. A blower 21 according to the second embodiment is a blower including the electric dust collector 1 according to the first embodiment.

  The blower 21 includes a blower body 22 and the electrostatic precipitator 1 inside a housing 26. The blower body 22 is a blower unit that blows the filter 23 provided at the air inlet of the blower body 22, the ventilation path 24 provided inside the blower body 22, and the contaminated air 4 to the electric dust collector 1. And a certain fan 25. When the fan 25 as a blower unit operates, the contaminated air 4 outside the blower body 22 passes through the filter 23 and is sucked into the fan 25 and sent out from the fan 25. The contaminated air 4 sent out from the fan 25 is cleaned in the electrostatic precipitator 1 and sent out as clean air 5 from the outlet 27.

  In the blower 21 shown in FIG. 9, the fan 25 and the electrostatic precipitator 1 are arranged in order from the upstream side in the direction of ventilation of the wind generated by the operation of the fan 25. Is not limited to the configuration shown in FIG.

  In the electrostatic precipitator 1, the contaminated air 4 is sent from the fan 25 and the particulates in the contaminated air 4 are removed. However, when the operation is continued for a long period of time, silica adheres to the end of the charged portion discharge electrode 7. In order to remove the silica adhering to the end of the charged portion discharge electrode 7, as explained in the first embodiment, the charged portion discharge electrode 7 can be boosted under the control of the control portion 12 to generate an ion wind. That's fine.

  The ion wind is generated from the charged portion discharge electrode 7 toward the surface of the charged portion counter electrode 8 facing the charged portion discharge electrode 7, but the direction in which the contaminated air 4 is sent from the fan 25 is perpendicular to the ion wind. It is. For this reason, the contaminated air 4 from the fan 25 becomes a factor which inhibits the ion wind which goes to the charged part counter electrode 8 from the charged part discharge electrode 7. FIG. Therefore, in order to efficiently remove the silica adhering to the end of the charged portion discharge electrode 7, it is preferable to stop the ventilation of the contaminated air 4 sent from the fan 25 when the ion wind is generated.

  For example, in the initial operation of the blower 21, the charged part discharge electrode 7 is boosted for a predetermined time and the ionized wind is generated by raising the charged part discharge electrode 7, and the silica adhered to the end of the charged part discharge electrode 7. Are removed by ion wind. The stop of the fan 25 is controlled by the control unit 12. That is, the control unit 12 performs control to stop the fan 25 for a predetermined time in a state where a voltage having a predetermined voltage value is applied to the charged portion discharge electrode 7. The control unit 12 transmits a fan stop instruction signal for instructing to stop the fan 25 to the fan 25. When the fan 25 receives the fan stop instruction signal, the fan 25 stops based on the fan stop instruction signal. Thereby, the inflow of the contaminated air 4 to the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 is blocked.

  By stopping the operation of the fan 25 in this way, the silica adhering to the end of the charged portion discharge electrode 7 can be blown off by the ionic wind without impeding the wind speed of the ionic wind by the air blown from the fan 25. .

  Then, after a certain period of time has elapsed, the fan 25 is operated, and the normal dust collection operation by the electric dust collector 1 is performed. The operation of the fan 25 is controlled by the control unit 12. The control unit 12 transmits a fan operation instruction signal for instructing the operation of the fan 25 to the fan 25. When the fan 25 receives the fan operation instruction signal, the fan 25 starts operation based on the fan operation instruction signal. Thereby, the contaminated air 4 can flow into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8.

  In addition, although the control part 12 also has a function as a ventilation part control part which controls the fan 25 here, the ventilation part control part which controls the fan 25 mentioned above is provided separately from the control part 12. Also good.

  Further, the timing of stopping the fan 25 for a certain time may be after the number of fine particles in the contaminated air 4 has decreased to the lower limit specified value and before the application of the voltage to the charged portion discharge electrode 7 is stopped, It is possible to remove the silica adhering to the end of the charged portion discharge electrode 7 by stopping the fan 25 at an arbitrary timing.

  FIG. 10 is a main part schematic diagram showing another schematic configuration of the blower 21 according to the second embodiment of the present invention. Instead of stopping the operation of the fan 25, as shown in FIG. 10, a shutter 13 capable of blocking the inflow of the contaminated air 4 into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 may be provided. Good.

  The shutter 13 is upstream of the flow of the contaminated air 4 in the direction of the wind generated by the operation of the fan 25, and is the contaminated air 4 to the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8. It is installed at a position that can block the inflow. That is, the shutter 13 is disposed between the fan 25 and the charging unit 2 of the electrostatic precipitator 1 and blocks the inflow of the contaminated air 4 blown from the shutter 13 into the charging unit 2. The shutter 13 is closed when the silica adhering to the end of the charged portion discharge electrode 7 is removed by the ion wind, and prevents the wind speed of the ion wind from being hindered by the air blown from the fan 25. Further, in the case of an operation not intended to remove silica adhering to the end of the charged portion discharge electrode 7 by an ion wind, that is, when the electric dust collector 1 performs a normal current collecting operation, the shutter 13 is It is opened, and inflow direction of the wind generated by the operation of the fan 25 allows the contaminated air 4 to flow into the charged space by the air blown from the fan 25.

  The shutter 13 is provided on the upstream side of the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8, that is, on the upstream side of the charged space in the direction of wind flow generated by the operation of the fan 25. The shutter 13 only needs to be able to block the inflow of the contaminated air 4 into the charging space in the direction of the air flow caused by the operation of the fan 25, and the shape and material may be appropriately selected. Further, when a plurality of sets of the charged portion discharge electrode 7 and the charged portion counter electrode 8 are stacked, it is preferable to block all the charged spaces, but it is configured to block only a part of the charged spaces. Is also possible.

  For example, in the initial operation of the blower 21, the charged portion discharge electrode 7 is boosted for a certain period of time with the shutter 13 closed to generate ion wind, and the silica adhering to the end of the charged portion discharge electrode 7 is ionized. Remove by wind. Closing of the shutter 13 is controlled by the control unit 12. The control unit 12 transmits a closing instruction signal for instructing closing of the shutter 13 to a shutter driving unit (not shown) that drives the shutter 13. When receiving the close instruction signal, the shutter driving unit closes the shutter 13 based on the close instruction signal. Thereby, the inflow of the contaminated air 4 to the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8 is blocked.

  By closing the shutter 13 in this manner, silica adhering to the end of the charged portion discharge electrode 7 can be blown off by the ionic wind without impeding the wind speed of the ionic wind by the air blown from the fan 25.

  Then, after a certain period of time has elapsed, the shutter 13 is opened, and the normal dust collection operation by the electrostatic dust collector 1 is performed. The opening of the shutter 13 is controlled by the control unit 12. The control unit 12 transmits an opening instruction signal for instructing opening of the shutter 13 to the shutter driving unit. Upon receiving the opening instruction signal, the shutter driving unit opens the shutter 13 based on the opening instruction signal. Thereby, the contaminated air 4 can flow into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8.

  Note that the time during which the shutter 13 is closed may be appropriately selected according to the specifications of the electric dust collector 1, and the shutter 13 is opened after a certain time to perform a normal dust collecting operation. The timing of closing the shutter 13 may be after the number of fine particles in the contaminated air 4 has decreased to the lower limit specified value and before the application of the voltage to the charged portion discharge electrode 7 is stopped. Thus, it is possible to remove the silica adhering to the end of the charged portion discharge electrode 7 by closing the shutter 13.

  Here, the control unit 12 also has a function as a shutter control unit that controls the shutter 13, but a shutter control unit that controls the fan 25 described above may be provided separately from the control unit 12.

  As described above, since the blower 21 according to the second embodiment includes the electric dust collector 1 according to the first embodiment, the blower 21 has the same effects as those in the first embodiment. In addition, the blower 21 according to the second embodiment blocks ions from being blown from the fan 25 by blocking the inflow of the contaminated air 4 into the charged space between the charged portion discharge electrode 7 and the charged portion counter electrode 8. Silica adhering to the end of the charged portion discharge electrode 7 can be blown off by the ion wind without hindering the wind speed. Thereby, the air blower 21 concerning this Embodiment 2 suppresses the fall of the dust collection function of the electric dust collector 1 resulting from the adhesion of the silica to the charged part discharge electrode 7, and implement | achieves the lifetime improvement of a dust collection function. be able to.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Electric dust collector, 2 Charging part, 3 Dust collection part, 4 Contaminated air, 5 Clean air, 6 High voltage power supply, 7 Charging part discharge electrode, 8 Charging part counter electrode, 9 Dust collection part high voltage electrode, 10 Dust collection Counter electrode, 11 particulate sensor, 12 control unit, 13 shutter, 21 blower, 22 blower body, 23 filter, 24 ventilation path, 25 fan, 26 housing, 27 outlet, 101 processor, 102 memory.

Claims (5)

A particle sensor for detecting the quantity of particulate matter in the air to be treated;
A counter electrode having a ground potential; and a discharge electrode facing the counter electrode, and applying a voltage to the discharge electrode to generate a corona discharge between the discharge electrode and the counter electrode to generate the air. A charged portion for charging the particulate matter in the inside,
A dust collection unit that collects the particulate matter charged in the charging unit by Coulomb force;
A power source for applying a voltage to the discharge electrode;
A control unit that controls application of a voltage from the power source to the discharge electrode;
With
The control unit is based on the detection result of the particle sensor.
When the number of particulate matter in the air to be treated is equal to or lower than a predetermined lower reference value in a state where a predetermined voltage value is applied to the discharge electrode, the voltage to the discharge electrode is reduced. Control to stop the application,
In a state where the application of voltage to the discharge electrode is stopped, when the quantity of particulate matter in the air to be processed is equal to or higher than a predetermined upper limit reference value, a predetermined voltage value is applied to the discharge electrode. Control to apply the voltage of
At the start of operation of the charging unit, after applying a voltage higher than the predetermined voltage value to the discharge electrode, performing control to apply the predetermined voltage value to the discharge electrode;
Electric dust collector characterized by. The control unit is based on the detection result of the particle sensor.
The voltage to be applied to the discharge electrode when the number of particulate matter in the air to be treated is equal to or lower than the predetermined lower limit reference value in a state where a predetermined voltage value is applied to the discharge electrode. Performing step-by-step step-down in a plurality of stages to stop application of voltage to the discharge electrode,
The electrostatic precipitator according to claim 1. The electric dust collector according to claim 1 or 2,
A blower for blowing air to the electric dust collector;
A blower characterized by comprising: A blower control unit that performs control to stop the blower for a predetermined time in a state where a voltage of a predetermined voltage value is applied to the discharge electrode;
The blower according to claim 3. A shutter that is disposed between the air blowing unit and the charging unit of the electrostatic precipitator to block inflow of air blown from the air blowing unit into the charging unit;
A shutter control unit that performs control to close the shutter for a predetermined time in a state where a voltage of a predetermined voltage value is applied to the discharge electrode;
The blower according to claim 3, comprising:

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