JP2013158762A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector which can maintain high dust collection efficiency without being affected by the ambient environment by reducing the generation of a discharge current, especially in high temperature and high humidity conditions while controlling a spark discharge.SOLUTION: An electric dust collector includes a dust collection part 1 which forms an electric field by laminating an charge electrode plate 3 and a dust collection pole plate 4 alternately and applying different voltages to the charge electrode plate 3 and the dust collection pole plate 4. The charge electrode plate 3 is a semi-conductive pole plate with surface resistivity of 10to 10Ω/sq. The dust collection pole plate 4 is configured to cover a metal with a resin film with volume resistivity of not less than 10Ωcm or to coat the metal with a resin material. Consequently, the dust collector which can maintain high dust collection efficiency without being affected by the ambient environment by reducing the generation of a discharge current, especially in high temperature and high humidity conditions while suppressing a spark discharge by appropriate surface resistivity can be provided.

Description

  The present invention relates to a dust collector that collects dust in the air in the field of air purification.

  Conventionally, this type of dust collector mainly stacks a charging unit that ionizes air molecules by corona discharge and charges dust contained in the air and an electrode plate, and alternately applies different voltages to generate an electric field. There is known an electric dust collecting device including a dust collecting unit that collects dust charged by a charging unit by a Coulomb force by forming (see, for example, Patent Document 1).

  Hereinafter, the dust collector will be described with reference to FIG. As shown in FIG. 4, the charging unit 101 includes a linear discharge electrode 102 and a ground electrode plate 103, and a load electrode plate 105 and a dust collecting electrode plate 106 are fixed on the downstream side of the charging unit 101. There are provided dust collecting portions 104 that are alternately stacked at intervals.

  In the above configuration, the charging unit 101 generates an unequal electric field by applying a voltage between the discharge electrode 102 and the ground electrode plate 103, and a corona discharge is generated between the discharge electrode 102 and the ground electrode plate 103. . Air ions having the same polarity as the voltage applied to the discharge electrode 102 are generated by corona discharge, diffused and moved, and are attached to the dust passing through the charging unit 101 to charge the dust.

  The charged dust is introduced into the dust collecting unit 104 along the flow of air. Here, when a voltage is applied to the load electrode plate 105 so as to have the same polarity as the discharge electrode 102, the charged dust receives the force of the electric field generated between the load electrode plate 105 and the dust collecting electrode plate 106 and is mainly Then, it adheres to the dust collecting electrode plate 106 and is removed, and clean air is blown out from behind the dust collecting portion 104.

Here, the dust collector is characterized in that the dust collecting portion is constituted by the load electrode plate 105 made of a hygroscopic resin having a volume resistivity of 10 ¹⁰ to 10 ¹³ Ω · cm. That is, the load electrode plate 105 is made of a semiconductive hygroscopic resin that conducts electricity slightly and its surface resistivity is kept in an appropriate range, whereby an electric field is provided between the load electrode plate 105 and the dust collecting electrode plate 106. Is provided, and at the same time, it is suggested that the dust collecting portion 104 capable of suppressing spark discharge that causes a reduction in the collection efficiency of the dust collecting device can be obtained.

Japanese Patent No. 3516725

  Since the load electrode plate described in Patent Document 1 is made of a hygroscopic resin, a discharge current is generated between the load electrode plate and the dust collecting electrode plate when the surrounding humidity is 90% or more, resulting in an increase in power consumption. Therefore, when the high-voltage power supply capacity is insufficient, there is a problem that the dust collection efficiency is lowered.

  Accordingly, the present invention solves the above-described conventional problems, and provides a dust collector capable of maintaining a high dust collection efficiency by reducing the occurrence of discharge current without being affected by the surrounding environment while suppressing spark discharge. The purpose is to do.

In order to achieve this object, the present invention provides a collector that alternately stacks a load electrode plate and a dust collecting electrode plate and applies different voltages to the load electrode plate and the dust collecting electrode plate to form an electric field. In the electric dust collector having a dust part, the load electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the dust collector plate is made of a metal with a volume resistivity. Is a dust collector characterized by being coated with a resin film of 10 ⁹ Ω · cm or more or coated with a resin material, thereby achieving the intended purpose.

According to the present invention, an electric collector having a dust collector that alternately stacks a load electrode plate and a dust collector electrode plate and applies different voltages to the load electrode plate and the dust collector electrode plate to form an electric field. In the dust apparatus, the load electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the dust collecting plate has a volume resistivity of 10 ⁹ Ω · cm or more to a metal. The dust collector is characterized by being covered with a resin film or coated with a resin material, thereby suppressing spark discharge with an appropriate surface resistivity and reducing the generation of discharge current, especially in high temperature and high humidity conditions. An object of the present invention is to provide a dust collector that can maintain high dust collection efficiency without being affected by the surrounding environment.

The perspective view which looked at the dust collection part with which the dust collector of Embodiment 1 of this invention was equipped was seen from the top The perspective view which looked at the dust collection part with which the dust collector was equipped from the bottom Perspective view of electrode plate holding means provided in the dust collector Configuration diagram of conventional dust collector

According to a first aspect of the present invention, there is provided a dust collecting portion that alternately stacks a load electrode plate and a dust collecting electrode plate and applies different voltages to the load electrode plate and the dust collecting electrode plate to form an electric field. In the electric dust collector, the load electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the dust collector plate has a volume resistivity of 10 ^{9 to} metal. The dust collector is characterized by being coated with a resin film of Ω · cm or more or coated with a resin material.

  This provides a dust collector capable of maintaining high dust collection efficiency without being affected by the surrounding environment by reducing the generation of discharge current, especially in high temperature and high humidity conditions, while suppressing spark discharge with an appropriate surface resistivity. can do.

  The semiconductive electrode plate may be a plate-like base material including at least fibrous ceramics.

As a plate-like substrate containing fibrous ceramics, for example, there is ceramic paper. Ceramic paper adsorbs moisture in the air and has a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, so that itself can be a semiconductive electrode plate, while suppressing spark discharge. The function as a dust collecting part can be sufficiently exhibited. Further, since the fibrous ceramics are light in weight, the weight of the electrode plate can be reduced, and the weight as the dust collecting part can be reduced.

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

(Embodiment 1)
The perspective view which looked at the dust collection part 1 of the dust collector of this invention from the top is shown in FIG. 1, and the perspective view seen from the bottom is shown in FIG. The dust collecting section 1 includes a frame 2 as an outer shell, and a load electrode plate 3 that applies a high voltage to the inside thereof and a dust collecting electrode plate 4 that is opposed to the ground electrode plate 4 and alternately connected at a constant interval. Has been placed.

  In the present embodiment, −7 kV is applied to the load electrode plate 3 and 0 kV (ie, ground) is applied to the dust collection electrode plate 4, and the distance between the load electrode plate 3 and the dust collection electrode plate 4 is 6 mm.

  As a result, an electric field is generated between the load electrode plate 3 and the dust collecting electrode plate 4, and dust that is negatively charged when passing through the charging portion (not shown) passes through the dust collecting portion 1. The coulomb force generated by the electric field is mainly collected on the dust collecting electrode plate 4.

  The load electrode plate 3 is a semiconductive electrode plate made of ceramic paper which is a plate-like base material having a plate thickness of 1 mm and containing fibrous ceramics. Ceramic paper adsorbs moisture in the air, so that its surface resistivity is on the order of 7 to the 13th power Ω / □.

  By making the surface resistivity of the load electrode plate 3 less than or equal to 10 13 Ω / □, it is possible to quickly charge the electrode plate surface when a voltage is applied. An electric field can be generated between the dust collecting electrode plates 4.

  By setting the surface resistivity of the load electrode plate 3 to the order of 10 7 Ω / □ or more, when a large current such as spark discharge flows, the voltage drop on the electrode plate surface increases. The potential difference between the electrode plates becomes small, and spark discharge is suppressed. Since no spark discharge occurs, the collection efficiency of the dust collector does not decrease, and the generation of unpleasant sound, light, noise, etc. can be suppressed.

  When the dust collecting electrode plate 4 is a conductive electrode plate, for example, a metal plate such as stainless steel, the load electrode plate 3 is used when the surrounding environment is high temperature and high humidity (for example, when the temperature is 40 ° C. and the relative humidity is 90%). The air insulation between the dust collecting electrode plates 4 changes, and discharge occurs between the electrode plates, so that the current value is extremely improved. In this case, if the capacity of a power source (not shown) that provides a potential difference between the load electrode plate 3 and the dust collecting electrode plate 4 is insufficient, the dust collecting performance is extremely deteriorated, and in some cases, the dust cannot be collected.

  Therefore, the dust collection electrode plate 4 has a laminate film (for example, a thin film made of a material such as PET, PP, PVDF, etc.) attached to the surface of the conductive electrode plate, so that the air insulation state changes. However, discharge can be prevented.

  The load electrode plate 3 is fixed at the bottom surface side of the dust collector 1 by the electrode plate fixing means 7 and fixed at the top surface side of the dust collector 1 by the electrode plate holding means 5.

  Here, when the load electrode plate 3 is made of ceramic paper with low rigidity, the electrode plate holding means 5 that can suppress the deflection of the electrode plate due to the force of the electric field will be described in detail.

  When the load electrode plate 3 is made of a material having a sufficiently high rigidity such as metal, a voltage is applied to the dust collecting portion 1 and an electric field works between the load electrode plate 3 and the dust collection electrode plate 4. However, since the deflection of the load electrode plate 3 due to the electric field force does not occur, the gap between the load electrode plate 3 and the dust collection electrode plate 4 is maintained even with the electrode plate fixing means 7 alone, and the dust collection performance is deteriorated. There is no.

  In the present embodiment, as described above, the load electrode plate 3 is made of ceramic paper having a plate thickness of 1 mm.

  By configuring the load electrode plate 3 with a semiconductive electrode plate made of ceramic paper, it is possible to provide a dust collector having high dust collection performance while suppressing spark discharge. However, since the ceramic paper itself has low rigidity, the load electrode plate 3 cannot be sufficiently fixed only by the electrode plate fixing means 7. Since the upper end of the load electrode plate 3 is not fixed, a deflection occurs when an electric field is applied between the load electrode plate 3 and the dust collecting electrode plate 4 by applying a voltage to the dust collecting portion 1. As a result, the dust collection efficiency may be reduced.

  In the present embodiment, the load electrode plate 3 is fixed by the electrode plate fixing means 7 and the electrode plate holding means 5. By fixing the upper end of the load electrode plate 3 using the electrode plate holding means 5, even if a voltage is applied to the dust collector 1 and an electric field acts between the load electrode plate 3 and the dust collector electrode plate 4, It is possible to provide a dust collector capable of suppressing the deflection of the electrode plate due to the electric field force and maintaining high dust collection efficiency.

  Further, by constituting the load electrode plate 3 with ceramic paper, the weight of the electrode plate can be reduced, and the weight of the dust collecting portion 1 can be reduced.

  In the present embodiment, the electrode plate holding means 5 is configured to sandwich one side in the depth direction of the dust collector 1 among the sides of the load electrode plate 3.

  By sandwiching the sides of the load electrode plate 3 positioned in the depth direction of the dust collecting unit 1, that is, in parallel with the flow of the wind passing through the dust collecting unit 1, the electrode plate holding unit 5 The load electrode plate 3 can be held so as not to hinder the flow of the pressure, and the pressure loss can be reduced.

  In the present embodiment, the electrode plate holding means 5 is configured to sandwich at least one third of the side of the load electrode plate 3.

  If the sandwiching length is less than one third, the force for fixing the load electrode plate 3 is insufficient, and when a voltage is applied, the electrode plate may bend due to the force of the generated electric field. By setting the length to be sandwiched and supported to be one third or more, the load electrode plate 3 can be reliably fixed, and deflection can be suppressed.

  A perspective view of the electrode plate holding means 5 is shown in FIG. A schematic diagram enlarging a part thereof is shown in FIG. The electrode plate holding means 5 includes an electrode plate pinching member 8 made of stainless steel and a support insulator 9 made of an insulating resin, and the support insulator 9 is provided with a protrusion 10. The electrode sandwiching member 8 also serves as a member for applying a voltage to the load electrode plate 3, thereby reducing the number of parts.

  FIG. 4 shows a schematic diagram in which a part of the electrode plate holding means 5 is enlarged. The electrode plate holding means 5 is configured to fit the protrusion 10 provided on the support insulator 9 into the groove provided on the frame 2. At this time, since the tensile force applying means 6 made of elastic rubber is provided between the electrode plate holding means 5 and the frame body 2, the electrode plate holding means 5 seems to be pulled upward. The projection 10 is caught by the groove of the frame body 2 and fixed.

  Thereby, a tensile force can be applied to the load electrode plate 3 fixed by the electrode plate holding means 5, and even if a material having low rigidity such as ceramic paper is used as the load electrode plate 3, By applying and holding tension in the vertical direction, the occurrence of deflection due to the force of the electric field can be suppressed.

  According to the dust collector of the present invention, it is possible to provide a dust collector capable of maintaining high dust collection efficiency while suppressing spark discharge with an appropriate surface resistivity. Useful for ventilation fans.

DESCRIPTION OF SYMBOLS 1 Dust collection part 2 Frame 3 Load electrode plate 4 Dust collection electrode plate 5 Electrode plate holding means 6 Tensile force application means 7 Electrode plate fixing means 8 Electrode plate clamping member 9 Support insulator 10 Protrusion part 101 Charging part 102 Discharge electrode 103 Ground electrode Plate 104 Dust collector 105 Load electrode plate 106 Dust collector plate

Claims (2)

In an electric dust collector having a dust collecting portion that alternately stacks load electrode plates and dust collecting electrode plates, and forms different electric fields by applying different voltages to the load electrode plates and the dust collecting electrode plates,
The load electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the dust collecting electrode plate is coated with a resin film having a volume resistivity of 10 ⁹ Ω · cm or more on metal. Or dust collector coated with resin material. The dust collector according to claim 1, wherein the semiconductive electrode plate is made of a plate-like base material containing at least fibrous ceramics.

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