JP2013049014A - Dust collecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collecting apparatus capable of maintaining a high efficiency of dust collection, by preventing warpage of an electrode plate due to an electric field strength, even if a board thickness is small and the rigidity of the electrode plate is low, while controlling a spark discharge in the dust collecting apparatus.SOLUTION: The dust collecting apparatus has a semiconductive electrode plate in which at least either one of a charge electrode plate or a dust collecting electrode plate has a surface resistivity of 10-10Ω/square, wherein the semiconductive electrode plate is fixed by an electrode plate fixing means. Also, an electrode plate-holding means is provided for preventing the warpage of the semiconductive electrode plate when receiving the electric field strength by applying a voltage between the charge electrode plate and the dust collecting electrode plate. Accordingly, while the spark discharge is controlled by the appropriate surface resistivity, even if the material with a small board thickness and a low rigidity is used for the electrode plate, the warpage of the electrode plate due to the electric field strength is prevented by the electrode plate-holding means, and thereby the dust collecting apparatus capable of maintaining the high efficiency of dust collection 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. 6, 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, rigidity is insufficient when the plate thickness is reduced for the purpose of reducing the weight of the dust collecting part and reducing the cost. When the voltage is applied to the dust electrode plate, the load electrode plate bends due to the force of the electric field, and the gap between the dust collection electrode plate is narrow on one side and wide on the other side, so that the space is widened. There has been a problem that the dust collection efficiency of the slab is greatly reduced.

  Therefore, the present invention solves the above-described conventional problems, and suppresses the deflection of the electrode plate due to the electric field force even if the plate thickness is thin and the electrode plate itself has low rigidity while suppressing spark discharge. An object of the present invention is to provide a dust collector capable of maintaining high dust collection efficiency.

In order to achieve this object, the present invention provides a dust collecting device in which a load electrode plate and a dust collecting electrode plate are alternately laminated, and different voltages are applied to the load electrode plate and the dust collecting electrode plate to form an electric field. In the electric dust collector having a portion, at least one of the load electrode plate and the dust collector electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, The semiconductive electrode plate is fixed by electrode plate fixing means, and the deflection of the semiconductive electrode plate when a voltage is applied between the load electrode plate and the dust collecting electrode plate to receive the force of an electric field. The dust collecting apparatus is characterized by providing the electrode plate holding means for suppressing, thereby achieving the intended purpose.

According to the present invention, an electric dust collector having 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 apparatus, at least one of the load electrode plate and the dust collecting electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the semiconductive electrode plate is an electrode plate. An electrode plate holding means is provided that suppresses the deflection of the semiconductive electrode plate when a voltage is applied between the load electrode plate and the dust collecting electrode plate to receive the force of an electric field. By using the dust collector characterized by the above, even if a material with a thin plate thickness and low rigidity is used for the electrode plate while suppressing spark discharge with an appropriate surface resistivity, the electric field is maintained by the electrode plate holding means. Provides a dust collector that suppresses the deflection of the electrode plate due to the power of and maintains high dust collection efficiency For the purpose of Rukoto.

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 Schematic diagram enlarging a part of the electrode plate holding means provided in the dust collector The block diagram which shows the cross section of the electrode plate holding means with which the dust collector was equipped 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, at least one of the load electrode plate and the dust collecting electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the semiconductive The electrode plate is fixed by an electrode plate fixing means, and the deflection of the semiconductive electrode plate is suppressed when a voltage is applied between the load electrode plate and the dust collecting electrode plate to receive the force of an electric field. A dust collector characterized in that an electrode plate holding means is provided.

  Thereby, while suppressing spark discharge with an appropriate surface resistivity, even if a material with a thin plate thickness and low rigidity is used for the electrode plate, the electrode plate holding means suppresses the deflection of the electrode plate due to the electric field force, A dust collector capable of maintaining high dust collection efficiency can be provided.

  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.

  Further, the electrode plate holding means may be fixed by inserting at least one side of the semiconductive electrode plate in the depth direction of the dust collecting portion.

  The electrode plate holding means does not hinder the wind flow by sandwiching the electrode plate side located in the depth direction of the dust collecting part, that is, in parallel with the wind flow passing through the dust collecting part. It is possible to hold the electrode plate and reduce pressure loss.

  The length sandwiched by the electrode plate holding means may be one third or more of the side length.

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

  The electrode plate holding means may sandwich a conductive or semiconductive slip stopper between the electrode plate and the semiconductive electrode plate.

  Depending on the material of the electrode plate holding means and the semiconductive electrode plate, even if sandwiched and fixed, the surface may slip, and when a voltage is applied, the electrode plate bends due to the force of the generated electric field. There is a fear. By sandwiching a conductive or semiconductive anti-slip between the two, it is possible to suppress the deflection of the electrode plate while applying a voltage to the electrode plate.

  Further, the electrode plate holding means may be provided with a tensile force applying means for applying a tensile force.

  Thereby, a tensile force can be applied to the electrode plate fixed by the electrode plate holding means, and the occurrence of deflection due to the electric field force can be suppressed even if the electrode plate has low rigidity.

  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.

  The dust collecting electrode plate 4 may be any electrode plate having conductivity, and for example, a metal plate such as stainless steel or a resin plate having conductivity may be used. In the present embodiment, the dust collecting electrode plate 4 is an aluminum plate having a thickness of 0.5 mm.

  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, the electrode plate holding means 5 that can suppress the deflection of the electrode plate due to the force of the electric field when the semiconductive electrode plate is made of ceramic paper having low rigidity, which is a feature of the present application, 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 constituting 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.

  FIG. 5 is a block diagram showing a cross section of the electrode plate holding means 5. The electrode plate sandwiching member 8 is provided with a non-slip 11. The anti-slip 11 is made of conductive rubber, and the load electrode plate 3 is sandwiched between these portions.

  Since the electrode plate sandwiching member 8 is made of stainless steel and the load electrode plate 3 is made of ceramic paper, when the anti-slip 11 is not provided, slippage occurs on the surface even when the plate is pinched and fixed, and this occurs when voltage is applied. There is a risk that the load electrode plate 3 will bend under the force of the applied electric field. This can be suppressed by sandwiching the slip stopper 11 between the two. The anti-slip 11 may be semiconductive.

  In the present embodiment, −7 kV is applied to the load electrode plate 3 and 0 kV (that is, ground) is applied to the dust collecting electrode plate 4, and the distance between the load electrode plate 3 and the dust collecting electrode plate 4 is 6 mm. However, the present invention is not limited to this, and any value that can achieve the desired dust collection performance may be used.

  For example, the same effect can be obtained by applying 0 kV (that is, grounding) to the load electrode plate 3 and applying -7 kV to the dust collecting electrode plate 4. In this case, the charged dust is mainly collected on the load electrode plate 3.

  In the present embodiment, the electrode plate holding means 5 sandwiches one side of the load electrode plate 3 with a structure in which one third or more of the sides of the load electrode plate 3 are sandwiched by a continuous structure. However, the present invention is not limited to this, and any configuration that can obtain the same effect may be used.

  For example, the portion where the electrode plate holding means 5 sandwiches the load electrode plate 3 may be divided into a plurality of portions so that the total length sandwiches one third or more of the sides of the load electrode plate 3.

  In the present embodiment, the tensile force applying means 6 is provided between the electrode plate holding means 5 and the frame body 2. However, the present invention is not limited to this, and any structure that can obtain the same effect is provided. That's fine.

  For example, a tension force applying means 6 may be provided between the electrode plate holding member 8 and the support insulator 9 constituting the electrode plate holding means 5 so as to apply a tensile force to the load electrode plate 3 through the electrode plate holding member 8. .

  In this embodiment, rubber having elasticity is used as the tensile force applying means 6, but the present invention is not limited to this, and a tensile force is applied to the load electrode plate 3 through the electrode plate holding means 5. Any configuration can be used.

  For example, instead of rubber, a spring body that itself has elasticity, or a spring structure that can apply a tensile force to the load electrode plate 3 may be used.

  In the present embodiment, as a means for fixing the electrode plate holding means 5 to the frame body 2, the protruding portion 10 is configured to be fitted into a groove provided in the frame body 2, but the present invention is not limited to this. Instead, any configuration that can obtain the same effect may be used.

  In the present embodiment, the electrode plate sandwiching member 8 is provided with the anti-slip 11 made of conductive rubber. However, the present invention is not limited to this, and any structure can be used as long as the same effect can be obtained.

  For example, the electrode plate sandwiching member 8 and the load electrode plate 3 may be fixed with a conductive adhesive or the like.

  In the present embodiment, the electrode sandwiching member 8 is made of stainless steel and also serves as a member for applying a voltage to the load electrode plate 3. However, the present invention is not limited to this and satisfies the requirements. Any configuration can be used.

  Even if a material with a thin plate thickness and low rigidity is used for the electrode plate while suppressing spark discharge with an appropriate surface resistivity by the dust collector according to the present invention, the electrode plate holding means prevents the electrode plate by the force of the electric field. Since it is possible to provide a dust collector that can suppress deflection and maintain high dust collection efficiency, it is useful for indoor air cleaners, air supply type ventilation fans, and the like.

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 pinching member 9 Support insulator 10 Protrusion part 11 Non-slip 101 Charging part 102 Discharge electrode 103 Ground electrode plate 104 Dust collector 105 Load electrode plate 106 Dust collector plate

Claims (6)

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,
At least one of the load electrode plate and the dust collecting electrode plate is a semiconductive electrode plate having a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and the semiconductive electrode plate is formed by an electrode plate fixing means. In addition to fixing, there is provided an electrode plate holding means for suppressing the deflection of the semiconductive electrode plate when a voltage is applied between the load electrode plate and the dust collecting electrode plate to receive the force of an electric field. Dust collector characterized. 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. The dust collector according to claim 1 or 2, wherein the electrode plate holding means sandwiches and fixes at least one side of the semiconductive electrode plate in the depth direction of the dust collecting portion. The dust collector according to claim 3, wherein a length sandwiched by the electrode plate holding means is one third or more of a side length. The dust collector according to claim 3 or 4, wherein the electrode plate holding means has a conductive or semiconductive anti-slip material between the electrode plate holding means and the semiconductive electrode plate. The dust collector according to any one of claims 3 to 5, wherein the electrode plate holding means is provided with a tensile force applying means for applying a tensile force.

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