JP2009090205A - Electrostatic filtration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter capable of detecting lowering of collection performance and recovering the collection performance, in order to solve problems of conventional electrostatic filters wherein continuous application of potential causes charging in fibers, a dielectric phenomenon is caused by attachment of dust, and a surface potential is lowered, to cause lowering of the collection performance. <P>SOLUTION: An electrostatic filtration apparatus is provided with: conductive fiber 1 having conductivity; insulation fiber 3 with the surface of conductive fiber 19 having conductivity subjected to the insulation treatment; a power source 4 applying potential between the conductive fiber 1 and conductive fiber 19 of the insulation fiber 3; an electrostatic capacitance detection means 5 detecting the electrostatic capacitance at the crossing part of the conductive fiber 1 and insulation fiber 3, and a voltage control means 10 controlling the output value of the power source 4. Consequently, the electrostatic filtration apparatus can detect the lowering of the surface potential of fibers due to attachment of dust, can raise the output value of voltage and can increase the collection performance. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dust collection filter device in the field of air cleaning for collecting dust.

  Conventionally, as this type of electrostatic filter, an electrostatic filter in which a fermentment of an electrical insulating material is formed in a cross pattern as a wire mesh is known (for example, see Patent Document 1). Hereinafter, the electrostatic filter will be described with reference to FIG.

As shown in FIG. 12, the wire mesh 101 includes an electrically insulated conductive wire 102 and an electrically insulated conductive wire 103 positioned in a cross shape, and the wire 102 is set as a set. The conductive bus 104 and the wire 103 are connected as a set with the conductive bus 105. An AC voltage supply source 106 is connected to the conductive bus 104 and the conductive bus 105, a voltage is applied from the AC voltage supply source 106, and the conductive wire 102 and the conductive wire 103 are energized. A potential is maintained between the wire 102 and the conductive wire 103, and charged particles passing through the wire mesh 101 adhere to the conductive wire 102 and the conductive wire 103.
Japanese Patent No. 2905036

  With such a conventional electrostatic filter, it is difficult to predict the maintenance timing because it cannot predict the dust collection performance, surface potential, gap clogging, and pressure loss due to dust trapping.

  The present invention solves such a conventional problem, can detect the trapped amount of dust, and can promote maintenance when the trapped amount is large.

  Moreover, when the trapped dust is polarized, there is a problem that the dust collection performance is deteriorated.

  The present invention solves such a conventional problem, and when dust collection efficiency is reduced due to dust trapping, it can be detected and the trapped particles can be detached from the filter.

  Further, when the dust is not charged or the charge amount is low, the conventional electrostatic filter has a problem that the dust collection efficiency is low.

  The present invention solves such a conventional problem. When the charge amount of the dust is low, it can be detected and the charge amount of the dust can be increased to increase the dust collection efficiency.

  The electrostatic filter of the present invention applies a voltage between a conductive fiber having conductivity, an insulating fiber in which the surface of the conductive fiber having conductivity is insulated, and the conductive fiber and the conductive fiber of the insulating fiber. A voltage power source and a capacitance detecting means for detecting a capacitance at the intersection of the conductive fiber and the insulating fiber are provided.

  The other means comprises voltage control means for controlling the output value of the voltage power supply for applying the voltage.

  The other means includes polarity inversion means for switching the polarity of the voltage power source to which the voltage is applied.

  The other means includes corona discharge means on the windward side.

  The other means comprises a needle-like discharge electrode and a plate-like receiving electrode as corona discharge means.

  As another means, the discharge electrode of the corona discharge means is selected from either the end of the conductive fiber or the end of the insulating fiber whose surface is insulated.

  Another means is that the discharge electrode of the corona discharge means comprises the end of the conductive fiber and the end of the insulating fiber whose surface is insulated.

  The other means is provided with a discharge amount control means for adjusting the discharge amount in the corona discharge means.

  Another means includes a maintenance display means for urging maintenance of the conductive fiber and the insulating fiber whose surface is insulated.

  Another means is to activate the corona discharge means when the output value of the capacitance detection means is constant.

  The other means is to activate the voltage control means when the output value of the capacitance detection means is below a certain value.

  The other means is to activate the polarity inversion means when the output value of the capacitance detection means becomes a certain value or less.

  Another means is that the maintenance display means is activated when the output value of the capacitance detection means becomes a certain value or less.

  Another means is that the polarity reversing means and the maintenance display means are activated at the same time when the output value of the capacitance detecting means is below a certain value.

  According to the present invention, a conductive fiber having conductivity, an insulating fiber in which the surface of the conductive fiber having conductivity is insulated, and a voltage power source that applies a voltage between the conductive fiber and the conductive fiber of the insulating fiber And electrostatic capacity detecting means for detecting the electrostatic capacity at the intersection of the conductive fiber and the insulating fiber, the electrostatic capacity has an effect that it is possible to always monitor performance degradation due to dust trapping. A filter can be provided.

  In addition, by providing a voltage control means for controlling the output value of the voltage power supply to be applied, an electrostatic filter is provided that can increase the applied voltage and increase the dust collection efficiency when performance degradation is detected. can do.

  Further, by providing the polarity reversing means for switching the polarity of the voltage power source to which the voltage is applied, it is possible to provide an electrostatic filter having an effect of promoting the detachment of the captured dust.

  In addition, since the corona discharge means is provided on the windward side, it is possible to provide an electrostatic filter having an effect of being able to capture even dust having a low charge amount.

  Further, since the corona discharge means is composed of a needle-shaped discharge electrode and a plate-shaped receiving electrode, it is possible to provide an electrostatic filter that is effective in capturing even dust with a lower charge amount.

  Also, the discharge electrode of the corona discharge means is selected from either the end of the conductive fiber or the end of the insulating fiber whose surface is insulated, thereby having a positively charged dust or negatively charged. It is possible to provide an electrostatic filter having an effect of improving the dust collection efficiency of both dusts.

  Further, the discharge electrode of the corona discharge means is composed of the end of the conductive fiber and the end of the insulating fiber whose surface is insulated, so that either positively charged dust or negatively charged dust can be used. An electrostatic filter having an effect of increasing dust collection efficiency can be provided.

  In addition, by providing a discharge amount control means for adjusting the discharge amount in the corona discharge means, the charge amount of the dust is increased by an optimum operation in accordance with the abundance ratio of dust having a positive charge and dust having a negative charge. It is possible to provide an electrostatic filter having an effect.

  In addition, by providing a maintenance display means for urging maintenance of the conductive fiber and the insulating fiber whose surface is insulated, it is possible to provide an electrostatic filter having an effect that the user can perform maintenance at an appropriate timing. can do.

  In addition, when the output value of the capacitance detection means is constant, it is possible to provide an electrostatic filter that has an effect of obtaining high dust collection efficiency by activating the corona discharge means.

  In addition, when the output value of the capacitance detection means becomes a certain value or less, an electrostatic filter having an effect that high dust collection efficiency can be obtained by activating the voltage control means can be provided.

  In addition, when the output value of the capacitance detection means becomes below a certain value, the polarity reversing means is activated to detach the captured dust so that the user can easily perform maintenance. An electric filter can be provided.

  In addition, when the output value of the capacitance detection means becomes below a certain value, an electrostatic filter having an effect that the user can perform maintenance at an appropriate timing by activating the maintenance display means is provided. be able to.

  In addition, when the output value of the capacitance detection means is below a certain value, when the output value of the capacitance detection means is below a certain value, by simultaneously starting the polarity reversing means and the maintenance display means, It is possible to provide an electrostatic filter having an effect that a user can easily perform maintenance at an appropriate timing.

  The electrostatic filter according to claim 1 of the present invention includes a conductive fiber having conductivity, an insulating fiber in which a surface of the conductive fiber having conductivity is insulated, the conductive fiber, and a conductive fiber of the insulating fiber. A voltage power source for applying a voltage between the conductive fiber and the insulating fiber, and a capacitance detecting means for detecting a capacitance at the intersection of the conductive fiber and the insulating fiber, By detecting the decrease in the capacitance, it is possible to monitor the decrease in performance due to dust trapping.

  According to a second aspect of the present invention, there is provided an electrostatic filter comprising voltage control means for controlling an output value of a voltage power source, and an effect of adjusting an electric field strength between a conductive fiber and an insulating fiber. Have

  Moreover, the electrostatic filter according to claim 3 of the present invention is provided with polarity reversing means for switching the polarity of the voltage power source, and generates an electric field in a direction opposite to normal between the conductive fiber and the insulating fiber. It has the action.

  According to a fourth aspect of the present invention, there is provided an electrostatic filter comprising corona discharge means for corona discharge on the windward side, generating ions on the windward side and increasing the charge amount of the dust. It has the action.

  The electrostatic filter according to claim 5 of the present invention comprises a needle-like discharge electrode and a plate-like receiving electrode as corona discharge means, which increases the amount of ions generated and charges the dust. It has the effect of further increasing the amount.

  In the electrostatic filter according to claim 6 of the present invention, the discharge electrode of the corona discharge means is selected from either the end of the conductive fiber or the end of the insulating fiber whose surface is insulated. It has the action of generating either positive or negative ions and increasing the charge amount of the dust.

  The electrostatic filter according to claim 7 of the present invention is such that the discharge electrode of the corona discharge means is composed of the end of the conductive fiber and the end of the insulating fiber whose surface is insulated. This produces an effect of increasing the charge amount of the dust.

  According to an eighth aspect of the present invention, there is provided an electrostatic filter comprising a corona discharge means having a discharge amount control means for adjusting a discharge amount, and adjusting a generation amount of ions to thereby charge the dust. Has the effect of increasing

  The electrostatic filter according to claim 9 of the present invention is provided with a maintenance display means for urging maintenance of the conductive fiber and the insulating fiber, and has an effect of making the user recognize the maintenance timing.

  The electrostatic filter according to claim 10 of the present invention is one in which the corona discharge means is activated when the output value of the capacitance detection means is constant, and when the dust collection efficiency is low, Has the effect of increasing the amount of charge.

  Moreover, the electrostatic filter according to claim 11 of the present invention is one in which the voltage control means is activated when the output value of the capacitance detection means falls below a certain value, and the dust collection efficiency is low. In some cases, the electric field strength is increased and the Coulomb force received by the dust is increased.

  The electrostatic filter according to claim 12 of the present invention is one in which the polarity reversing means is activated when the output value of the capacitance detecting means falls below a certain value, and the dust collection efficiency decreases. In this case, by generating a reverse electric field, the reverse Coulomb force acts on the dust to promote detachment.

  According to a thirteenth aspect of the present invention, when the output value of the capacitance detecting means falls below a certain value, the maintenance display means is activated, and the dust collection efficiency decreases. In this case, the user is made to recognize the maintenance timing.

  The electrostatic filter according to claim 14 of the present invention is one in which the polarity reversing means and the maintenance display means are activated simultaneously when the output value of the capacitance detection means becomes a certain value or less. When the dust collection efficiency is reduced, an electric field is generated in the reverse direction, and the reverse Coulomb force is applied to the captured dust to promote detachment, and at the same time, the user is made aware of the maintenance timing. Have.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
In FIG. 1, a voltage is applied between the conductive fiber 1 having conductivity, the insulating fiber 3 whose surface is insulated with the insulating material 2, and the conductive fiber 1 and the conductive fiber 19 of the insulating fiber 3. An electrostatic filter device 6 including a voltage power source 4 and electrostatic capacity detection means 5 for detecting electrostatic capacity at an intersection of a front conductive fiber and an insulating fiber is shown.

  The conductive fiber 1 and the conductive fiber 19 are selected from materials such as aluminum, iron, copper, nichrome, nickel, gold, silver, platinum, stainless steel, carbon, copper, and silver. It is preferable to use a metal material having a low internal resistance.

  The insulating fiber 3 in which the surface of the conductive fiber 19 is insulated is obtained by insulating the conductive fiber 19 from polyester, epoxy, silicon, polystyrene, polystyrene, polyvinyl chloride, Teflon (registered trademark), rubber, polyethylene terephthalate, phenol resin, and the like. Those coated with 2 are preferred. As a method of coating the insulating material, a spinning method in which the insulating material is spirally wound around the outside of the coating or conductive fiber may be adopted.

  The voltage power supply 4 gives a potential difference between the conductive fiber 1 and the insulating fiber 3 having conductivity, and does not matter whether it is AC / DC. The applied voltage may be a value that does not cause dielectric breakdown of the insulating material 2 of the insulating fiber 3.

  The capacitance detection means 5 measures the capacitance of a capacitor composed of two electrodes composed of conductive fibers 1 and insulating fibers 3 having conductivity, and an LCR meter, for example, can be used.

  In FIG. 2, the enlarged view of the contact of the conductive fiber 1 and the insulating fiber 3 which have electroconductivity is shown. FIG. 2 shows a cross shape in which the conductive fiber 1 is a warp and the insulating fiber 3 is a weft. However, as shown in FIG. 3, both the conductive fiber 1 and the insulating fiber 3 may be a warp. In the present invention, a potential difference is applied between the conductive fiber 1 and the conductive fiber 19 of the insulating fiber 3, and the generated electric field captures the dust by the Coulomb force applied to the charged dust. In consideration of the value divided by, it is more effective to reduce the distance between the electrodes as much as possible. By doing so, the Coulomb force acting on the dust can be increased, and the probability of collision of the dust with the filter device can be increased. As a result, the dust collection efficiency is increased. In addition, since the distance between the electrodes is short, the electric field strength can be increased even if the applied voltage is set low, so that the electrostatic filter has low power consumption and good dust collection efficiency.

  FIG. 4 shows a schematic view of the electrostatic filter device 6 of the present invention in which the air passage 7 is connected and the dust 9 is introduced by the blower 8.

  The air volume of the blower 8 affects the wind speed passing through the electrostatic filter device 6, and when the wind speed is too high, dust cannot be captured. Therefore, it is preferable to select an air volume that can be adjusted.

  Examples of the dust 9 include pollen, dust, tobacco smoke, oil mist, and SPM (Suspended Particulate Matter). Since these dusts 9 are charged either positively or negatively in the air, a Coulomb force acts by applying an electric field, and dust collection is achieved.

  When the dust 9 is fed from the windward side of the electrostatic filter device 6, Coulomb force acts on the dust 9 charged by the electric field generated in the electrostatic filter device 6. As a result, the positively charged dust is negatively charged to the negative electrode. The dust thus collected is captured by the positive electrode. When the dust 9 is captured by the conductive fibers or the insulating fibers of the electrostatic filter device 6, the distance between the electrodes is reduced and the electrode area is reduced. As a result, the capacitance is smaller than that in the initial state. By detecting this with the electrostatic capacity detection means 5, it is possible to determine the capturing state of the dust 9 by the electrostatic filter device 6.

  Here, the configurations of the electrostatic filter device 6, the air passage 7, and the blower 8 shown in FIG. 4 are, for example, household appliances such as an air cleaner, a dehumidifier, a humidifier, a ventilation fan, an air conditioner, a vacuum cleaner, and a clothes dryer, It corresponds to the exhaust part of automobiles and motorcycles. Further, the electrostatic filter device 6 of the present invention can be applied to a place where there is no air passage 7 and blower 8, for example, an entrance of a clean room in a factory. In this case, as a result of the airflow generated when a person passes near the electrostatic filter device 6, the suspended dust 9 approaches the electrostatic filter device 6 and is captured. In addition, when pollen is targeted as the dust 9, for example, the pollen is collected by installing the electrostatic filter device 6 in a place such as an entrance, a living room, a closet, or a bedroom in a house. Leading to prevention of symptoms and relief of symptoms.

(Embodiment 2)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 5 shows an example in which the electrostatic filter device 6 of the present invention is provided with voltage control means 10 for controlling the output voltage of the voltage power supply 4 and polarity inversion means 11 for switching the polarity. For example, a resistor can be used as the voltage control means 10. The polarity inversion means 11 can use switching using a rotating body, for example.

  When the polarity reversing means 11 is operated during the operation of the electrostatic filter device 6 of the present invention, the electric field is generated in the opposite direction, so that the Coulomb force in the opposite direction acts on the dust already captured. . Thereby, dust can be detached from the electrostatic filter device 6 and collected. Here, since the dust captured by the electrostatic filter device 6 also has a physical force other than the Coulomb force, when the polarity is reversed by the polarity reversing unit 11, the voltage control unit 10 collects the dust. It is preferable to apply a voltage higher than the applied voltage.

(Embodiment 3)
The same parts as those in the first or second embodiment are denoted by the same reference numerals and detailed description thereof is omitted. FIG. 6 shows a case where the electrostatic filter device 6 of the present invention is connected to the air passage 7 and the blower 8 and the corona discharge device 12 is provided on the windward side thereof. By generating a corona discharge in the air passage 7, the air in the air passage 7 is ionized and ions 13 are generated. When the ions 13 are combined with the dust 9, the charge amount of the dust 9 is increased, so that the Coulomb force received when passing through the electrostatic filter device 6 is increased, and as a result, the dust collection efficiency is increased.

  FIG. 7 shows details of the corona discharge device 12. The corona discharge device 12 includes a needle-like discharge electrode 14 and a plate-like reception electrode 15, and a corona discharge voltage power supply 16 that applies a voltage therebetween, and the reception electrode 15 is connected to the ground. The acicular discharge electrode 14 and the receiving electrode 15 may be any material that allows electricity to flow, such as metal or semiconductor. Further, the distance between the discharge electrode 14 and the receiving electrode 15 is determined in accordance with the output value of the corona discharge voltage power supply 16, but it is necessary to set it so that no spark is generated. Examples of the discharge electrode 14 include a metal needle such as SUS, and examples of the receiving electrode 15 include a metal plate such as SUS.

  In FIG. 8, the discharge electrode 14 of the corona discharge device 12 is connected to the end of the conductive fiber 1, and the discharge electrode 21 of the corona discharge device 24 is connected to the end of the conductive fiber 19 of the insulating fiber 3. The electrostatic filter apparatus 6 provided with the discharge amount control apparatuses 17 and 23 to adjust is shown.

  Examples of the discharge amount control device 17 include a resistor. The discharge electrode 14 has, for example, a metal needle, and may be subjected to a process of sharpening the end of the conductive fiber 1 in a needle shape. The end of the insulating fiber 3 is electrically conductive after scraping off the coating of the insulating material 2 with a file. The fiber 19 may be sharpened like a needle.

  For example, when a positive voltage is applied to the conductive fiber 1 and a negative voltage is applied to the conductive fiber 19 of the insulating fiber 3, the ions 13 generated by discharging from the end of the conductive fiber 1 are mainly positive and insulated. The ions 13 generated by discharging from the end of the conductive fiber 19 of the fiber 3 are mainly negative. The discharge amount control device 17 adjusts the voltage applied to the receiving electrode 15 from the end of the conductive fiber 1 as the discharge electrode 14, and the discharge amount control device 23 adjusts the voltage applied to the receiving electrode 22 from the end of the conductive fiber 19 of the insulating fiber 3. As a result, the balance of positive / negative ions to be generated can be adjusted. Here, in order to effectively associate the ions 13 generated by the corona discharge with the dust 9, it is preferable that the corona discharge is generated at the center of the air passage 7 and at a portion close to the electrostatic filter device 6. The electrostatic filter device 6 includes a frame that holds the conductive fibers 1 and the insulating fibers 3 that are alternately woven like a mesh. Although not shown, the air passage 7 is surrounded by a frame having the air passage frame 25 as a skeleton, and has a duct shape, for example. The arrow indicates the direction in which the air is blown.

  In this configuration, as shown in FIG. 8, the voltage power source for corona discharge and the voltage power source 4 of the electrostatic filter device 6 can be grouped together.

(Embodiment 4)
The same parts as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 9 shows the electrostatic filter device 6 provided with the maintenance display means 18. The maintenance display means 18 is for informing the user of the maintenance time, and is selected from an image display using a liquid crystal screen or a voice display using a speaker or the like. The maintenance display means 18 is connected to the capacitance detection means 5 by wiring, and the display is switched in conjunction with the capacitance value that is constantly measured during dust collection. During dust collection, the relationship between the capacitance value between the electrodes and the maintenance display is shown in FIG.

(Embodiment 5)
The same parts as those in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 11 shows the relationship between the capacitance and the operation pattern. Conductive fiber 1, insulating fiber 3, voltage power supply 4, capacitance detection means 5, voltage control means 10, polarity inversion means 11, corona discharge device 12, and discharge amount control device 17 shown in FIG. 5. An operation example of the electrostatic filter device 6 provided with the maintenance display means 18 is shown. An operation in which the electrostatic filter device 6 collects dust is defined as a dust removal operation.

  If the output value of the capacitance detecting means 5 is constant during the dust removal operation, it can be considered that dust is not collected. In this case, when the corona discharge device 12 is activated, the charge amount of the dust can be increased, which can contribute to dust collection. Further, the voltage control means 10 can contribute to dust collection by increasing the output value of the voltage power supply 4 and increasing the potential difference between the conductive fiber 1 and the conductive fiber 19 of the insulating fiber 3.

  If the output value of the capacitance detecting means 5 is lower than the initial value during the dust removal operation, it can be considered that dust collection is effectively performed. However, the trapped dust reduces the potential difference between the electrodes and lowers the capacitance, so that dust collection is not performed. A certain value at which this dust collection is not performed should be a boundary of the operating conditions. This value is the size and charge amount of dust, the wind speed and temperature / humidity of the air passing through the electrostatic filter device 6, and the electrostatic filter device 6. Although it is determined by parameters such as the electric field strength and the aperture diameter, it is appropriate that the initial capacitance is 50% to 70%.

  When the detected capacitance value during the dust removal operation is lower than 50% to 70% of the initial capacitance, the voltage control means 10 increases the output voltage of the voltage power supply 4 to increase the potential difference. Efficiency can be restored. Further, the dust collection efficiency can be recovered by starting the corona discharge device 12 and increasing the charge amount of the dust.

  Even if the above-described method is performed, if the value of the capacitance detection device 5 does not change or if it converges to a constant value even if it temporarily rises, recovery of the dust collection efficiency is impossible. Therefore, it is possible to drive the polarity driving means 11 and promote the detachment of the captured dust. Thereafter, the maintenance display means 18 is activated to promote maintenance, so that the dust collection efficiency can be recovered.

  As a maintenance method, after the voltage power source 4 is stopped, the conductive fiber 1 and the insulating fiber 3 are removed and washed with water. A method of cleaning with a detergent is also conceivable. In this case, the type of detergent is determined according to the materials of the conductive fibers 1 and the insulating fibers 3.

  It is possible to easily estimate the dust collection state and filter clogging state using the electrostatic capacity detection means attached to the electrostatic filter. Can be provided, and a dust collection filter with a large energy saving effect can be provided.

The figure which shows the structure of the electrostatic filter apparatus of Embodiment 1 of this invention. The enlarged view of the electrostatic filter apparatus of Embodiment 1 of this invention The 2nd enlarged view of the electrostatic filter apparatus of Embodiment 1 of this invention The figure which shows the dust collection of the dust using the electrostatic filter apparatus of Embodiment 1 of this invention The figure which shows the dust collection of the dust using the electrostatic filter apparatus of Embodiment 2 and 5 of this invention The figure which shows the dust collection of the dust using the electrostatic filter apparatus of Embodiment 3 of this invention The figure which shows the structure of the corona discharge means of Embodiment 3 of this invention. 2nd figure which shows the dust collection of the dust using the electrostatic filter apparatus of Embodiment 3 of this invention The figure which shows the dust collection of the dust using the electrostatic filter apparatus of Embodiment 4 of this invention The figure which shows the relationship between the maintenance display of Embodiment 4 of this invention, and an electrostatic capacitance. The figure which shows the electrostatic capacitance and operation pattern of Embodiment 5 of this invention. The figure which shows the structure of the conventional electrostatic filter

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conductive fiber 2 Insulating material 3 Insulating fiber 4 Voltage power supply 5 Capacitance detection means 6 Electrostatic filter device 7 Air path 8 Blower 9 Dust 10 Voltage control means 11 Polarity inversion means 12 Corona discharge device 13 Ion 14 Discharge electrode 15 Receiving electrode 16 Corona Discharge Voltage Power Supply 17 Discharge Control Device 18 Maintenance Display Means 19 Conductive Fiber 21 Discharge Electrode 22 Receiving Electrode 23 Discharge Control Device 24 Corona Discharge Device

Claims (14)

A conductive fiber having conductivity, an insulating fiber having a conductive fiber surface insulated, a voltage power source for applying a voltage between the conductive fiber and the conductive fiber of the insulating fiber, and the conductive fiber. An electrostatic filter device comprising: electrostatic capacitance detection means for detecting electrostatic capacitance at the intersection of the insulating fibers. 2. The electrostatic filter device according to claim 1, further comprising voltage control means for controlling an output value of the voltage power source. 2. The electrostatic filter device according to claim 1, further comprising polarity inversion means for switching the polarity of the voltage power source. 2. The electrostatic filter device according to claim 1, further comprising corona discharge means on the windward side. 5. The electrostatic filter device according to claim 1, further comprising a needle-shaped discharge electrode and a plate-shaped receiving electrode as corona discharge means. 6. The electrostatic filter according to claim 1, wherein the discharge electrode of the corona discharge means is selected from either the end of the conductive fiber or the end of the insulating fiber whose surface is insulated. apparatus. 6. The electrostatic filter device according to claim 1, wherein the discharge electrode of the corona discharge means comprises a terminal end of the conductive fiber and a terminal end of the insulating fiber whose surface is insulated. 8. The electrostatic filter device according to claim 1, wherein the corona discharge means includes discharge amount control means for adjusting a discharge amount. 2. The electrostatic filter device according to claim 1, further comprising maintenance display means for prompting maintenance of the conductive fibers and the insulating fibers whose surfaces are insulated. 9. The electrostatic filter device according to claim 1, wherein the corona discharge means is activated when the output value of the electrostatic capacity detection means is constant. 3. The electrostatic filter device according to claim 1, wherein when the output value of the capacitance detection means becomes equal to or less than a predetermined value, the voltage control means is activated. 4. The electrostatic filter device according to claim 1, wherein when the output value of the electrostatic capacity detection means becomes a predetermined value or less, the polarity inversion means is activated. 10. The electrostatic filter device according to claim 1 or 9, wherein when the output value of the electrostatic capacitance detection means becomes a predetermined value or less, the maintenance display means is activated. 10. The electrostatic filter device according to claim 1, wherein the polarity inversion unit and the maintenance display unit are activated at the same time when the output value of the electrostatic capacitance detection unit becomes a predetermined value or less.

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