JP2018167189A - Electric dust collector - Google Patents

Abstract

To provide an electric dust collector in which a ratio of an area which does not contribute to dust collection with respect to a surface area of an electrode is reduced.SOLUTION: An electric dust collector 1 includes a charging part 4a which electrifies dust in processed air by discharge from a discharge electrode 4a1, and a dust collection part 4b which collects the dust electrified by the charging part by an electrostatic field. The dust collection part 4b includes a plurality of collection electrodes 4b1 and high-voltage electrodes 4b2 arranged alternately in parallel. The collection electrodes 4b1 of the dust collection part and the high-voltage electrodes 4b2 of the dust collection part are formed of a conductive sheet 4b103 covered with insulation materials 4b104, 4b105.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an electric dust collector, and more particularly to an electric dust collector used for an air conditioner or an air cleaner.

  Some electric dust collectors include a charging unit that charges dust and dust, and a dust collecting unit that collects charged dust and dust. The dust collector has a plurality of sheet-like electrodes arranged in parallel, and applies a voltage between adjacent electrodes. As a result, an electrostatic field is generated between adjacent electrodes, and dust is adsorbed and collected by the electrostatic field. However, when a discharge occurs between the electrodes, the potential difference between the electrodes decreases, and the dust collection performance also decreases accordingly.

Various methods have been proposed to avoid this discharge. For example, a structure in which an electrode is sandwiched between two insulating sheets, such as an electrode plate shown in FIG. 8, is known (see Patent Document 1).
Discharge is suppressed by the insulating sheet.

The end of the insulating sheet is longer than the end of the electrode by a predetermined value (for example, 2 mm). This is because a process in which a plurality of electrodes are sandwiched between two sheets and then each electrode is cut and manufactured, and the electrodes cannot be arranged within the error range (for example, 1.5 mm) of the cutting position. .
However, there will be such a part that does not function electrically (does not contribute to dust collection), that is, a part at both ends where no electrode exists between the two insulating sheets, which hinders the miniaturization of the electric dust collector. There was a problem of becoming.

JP-A-3-217256

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique for realizing miniaturization of an electrostatic precipitator by reducing a portion of an electrode plate that does not contribute to dust collection. And

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A first aspect of the present invention includes a charging unit that charges dust by discharge, a high-voltage electrode that is a positive electrode, and a collection electrode that is a negative electrode, and a voltage is applied between the high-voltage electrode and the collection electrode. And a dust collecting unit that collects the dust charged by the charging unit when applied, wherein the high-voltage electrode and the collecting electrode are covered with an insulating material.

(2) In the configuration of (1), the collection electrode of the dust collection unit has a collection electrode protruding piece to which power is supplied, and the high voltage electrode of the dust collection unit is a high voltage electrode projection to which power is supplied The collection electrode protruding piece and the high-voltage electrode protruding piece are not covered with an insulating material.

(3) In the configuration of (1), the coating is a film formed of the insulating material.

  According to the present invention, it is possible to reduce the size of the electric dust collector by reducing the proportion of the electrode that does not contribute to dust collection.

It is a lineblock diagram showing an outline of an air cleaner concerning an embodiment of the present invention. It is a block diagram of the electric dust collector which concerns on embodiment of this invention. It is a perspective view of the dust collection part of the electric dust collector which concerns on embodiment of this invention. It is an assembly exploded view of the dust collection part of the electric dust collector which concerns on embodiment of this invention. It is a top view which shows the state in the middle of manufacture of the collection electrode which concerns on embodiment of this invention. It is a perspective view of the dust collection part collection electrode (collector sheet | seat) of the dust collection part of the electric dust collector which concerns on embodiment of this invention. It is sectional drawing of the collection electrode of the dust collection part of the electric dust collector which concerns on embodiment of this invention. It is sectional drawing of the collection electrode of the dust collection part by the insulating sheet of the dust collection part of the conventional electric dust collector.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.

(Air cleaner)
First, the outline | summary of the air cleaner 1 which concerns on this embodiment is demonstrated with reference to FIG. In the air cleaner 1, large dust is removed from the air sucked from the suction port 2 by the pre-filter 3, fine dust is collected by the electric dust collector 4, and the odor-causing substance is adsorbed by the deodorizing filter 5. The The air purified by this process is blown out from the outlet 8 by the fan 6.

  In addition to these, the air cleaner 1 is provided with a dust sensor 13 above the suction port 2, an operation display board 12 on the top of the air cleaner 1, and a power control board 9 below the fan 6. . In addition, a charging unit high-voltage power source 10 and a dust-collecting unit high-voltage power source 11 are provided in the vicinity of the electrostatic precipitator 4.

(Electric dust collector)
Next, the structure of the electric dust collector 4 will be described. As shown in FIG. 2, the electric dust collector 4 includes a charging unit 4a and a dust collecting unit 4b. The prefilter 3 removes large dust from the air. The dust contained in the air from which large dust has been removed is charged by the charging unit 4a and collected by the dust collecting unit 4b. More specifically, the charging unit 4a includes the discharge electrode 4a1 and the counter electrode 4a2, the dust collection unit 4b includes the collection electrode 4b1 (collector sheet) and the high-voltage electrode 4b2, and the charging unit 4a is contained in the air by corona discharge. The charged dust is collected by the collecting electrode 4b1 of the dust collecting part 4b by the electrostatic field generated between the collecting electrode 4b1 of the dust collecting part 4b and the high voltage electrode 4b2 of the dust collecting part 4b. Is done.

  Here, when the charging unit 4a and the dust collecting unit 4b are made into one set, an example having three sets is shown, but the number of sets is not limited thereto. A high voltage is supplied from the charging unit high-voltage power supply 10 to each charging unit 4a. A high voltage is supplied from one dust collector high-voltage power supply 11 to the dust collector 4b. The high-voltage power supply 10 for the charging unit and the high-voltage power supply 11 for the dust collection unit are controlled by the power supply control board 9, and the power supply control board 9 includes charging unit switches 9a1 and 9a2 that supply / shut off power to the charging unit 4a. , 9a3 and a dust collector switch 9b for supplying / cutting off electric power to the dust collector 4b. The power control board 9 is connected to a commercial power source 14.

(Dust collector)
Subsequently, the dust collector 4b of the electric dust collector 4 will be described. FIG. 3 shows the appearance of one dust collecting portion 4b. The dust collecting part 4b is surrounded by a dust collecting part case 4b3 and a dust collecting part cover 4b4, and the collection electrodes 4b1 and the high-voltage electrodes 4b2 are alternately arranged therein. A separator 4b5 is provided on the front surface of the dust collector case 4b3, and a high voltage supply terminal 4b6a and a ground terminal 4b6b are provided on both sides of the dust collector cover 4b4 in the short direction.

  The internal structure of the dust collecting portion 4b will be further described with reference to the assembly exploded view of FIG. As shown in FIG. 4, a dust collector case guide 4b31 is provided inside the dust collector case 4b3. A spacer 4b7 that keeps a gap between both electrodes constant is disposed between both ends of the collecting electrode 4b1 and the high-voltage electrode 4b2, and the spacer 4b7 is fitted to the dust collecting part case guide 4b31. Below the dust collector cover 4b4, collecting electrodes 4b1 and high voltage electrodes 4b2 are alternately arranged with spacers 4b7 interposed therebetween. Further, three separators 4b5 are fitted in the collecting electrode 4b1 and the high voltage electrode 4b2 in order to keep the distance between the electrodes constant and to increase the structural strength.

  A dust collector cover notch 4b41 is provided at the end of the dust collector cover 4b4 in the short direction, and the high voltage supply terminal 4b6a and the ground terminal 4b6b are respectively inserted in the vertical direction as described above. The high voltage supply terminal 4b6a on the left side in the drawing abuts on the collection electrode protruding piece 4b11 of the dust collection portion 4b provided at the left end of the collection electrode 4b1 in the dust collection portion 4b. The ground terminal 4b6b on the right side in the drawing contacts the high voltage electrode protruding piece 4b21 of the dust collection portion 4b provided at the right end of the high voltage electrode 4b2 of the dust collection portion 4b. A higher voltage is supplied to the high voltage electrode 4b2 than the high voltage electrode protruding piece 4b21. The high-voltage electrodes 4b2 and the collecting electrodes 4b1 are alternately arranged, the high-voltage electrode protruding pieces 4b21 provided on the high-voltage electrode 4b2, the collecting electrode protruding pieces 4b11 provided on the collecting electrode 4b1, and the ground-side terminal contact pieces 4b11a The high-voltage side terminal contact pieces 4b21a are also alternately arranged.

(Dust collector collecting electrode)
Here, the collection electrode 4b1 of the dust collection part 4b which concerns on this embodiment is formed by the following two parts. As shown in FIG. 6, the collecting electrode 4b1 of the dust collecting part 4b includes the collecting electrode body 4b106 of the dust collecting part 4b, the collecting electrode protruding piece 4b11 of the dust collecting part 4b, and the ground side of the dust collecting part 4b. A terminal contact piece 4b11a is provided. As will be described later, the collection electrode body 4b106 of the dust collection portion 4b is covered with an insulating material, and the collection electrode protruding piece 4b11 of the dust collection portion 4b is not covered with an insulation material.

  The cross section of the collection electrode main body 4b106 of the dust collection part 4b is demonstrated using FIG. In addition, although it demonstrates using the collection electrode main body 4b106 from here, description is abbreviate | omitted since the high voltage electrode 4b2 also becomes the same cross section and structure. In the collecting electrode body 4b106, the surface of the high-resistance conductive sheet 4b103 serving as an electrode is covered with a surface insulating coating 4b104 and an end surface insulating coating 4b105. Since the portion where the conductive sheet is disposed can collect dust, the range of the width L1 between the left and right end portions of the conductive sheet 4b103 is an effective portion effective for dust collection. The range of the thickness L2 of the left and right end face insulating coating surfaces 4b105 where the conductive sheet is not disposed is an ineffective portion where dust collection is not performed. The thickness L3 of the collecting electrode body 4b106 of the dust collecting portion 4b is the sum of the thickness L31 of the conductive sheet 4b103 and the thickness L32 of the front and back surface insulating coating surfaces 4b104. The thickness L2 of the end surface insulating coating surface 4b105 and the thickness L32 of the surface insulating coating surface 4b104 are the same.

  The manufacturing method of the collection electrode 4b1 of the dust collection part 4b is explained in full detail below. A synthetic resin (for example, polystyrene or vinyl chloride) blended with a conductive agent (polymer type antistatic agent or the like) is extruded and processed into, for example, a 0.4 mm sheet. Next, a conductor 4b0 composed of a main body 4b107, a protrusion 4b10 and a bent part 4b10a as shown in FIG. 5 is punched from this sheet, and then the bent part 4b10a of the punched conductor 4b0 is bent. This is the conductive sheet 4b103. An insulating ink serving as an insulating material is printed on the front and back surfaces of the conductive sheet 4b103, for example, with a thickness of 10 μm, and then cut into a predetermined shape and size. Next, insulating ink is similarly printed on the left and right end faces of the conductive sheet 4b103. As a result, the entire outer peripheral surface of the conductive sheet 4b103 is covered with the insulating film formed of the insulating ink, thereby forming the collecting electrode body 4b106.

  Here, instead of printing the insulating ink, the insulating ink may be sprayed on the conductive sheet 4b103, or the conductive sheet 4b103 may be immersed in the insulating ink. As long as it is coated with an insulating ink having a thickness of 10 μm as described above, the method is arbitrary.

  Here, with respect to the collecting electrode protruding piece 4b11 of the dust collecting portion 4b, the front and back surfaces and end surfaces thereof are not covered with the insulating ink. Thereby, as shown in FIG. 4, the ground side terminal contact piece 4b11a and the ground terminal 4b6a, and the high voltage side terminal contact piece 4b21a and the high voltage supply terminal 4b6b can be electrically connected.

  On the other hand, the collecting electrode 4b2 using the conventional insulating sheet shown in FIG. 8 is printed with conductive ink 4b100 serving as an electrode between the cover insulating sheet 4b101 and the base insulating sheet 4b102. As described above, in this case, individual electrodes are separated from one sheet on which a plurality of conductive inks 4b100 are printed at the left and right ends of the width L5 portion, which is an effective portion on which the conductive ink 4b100 is printed. In consideration of the cutting error, the cover insulating sheet 4b101 and the base insulating sheet 4b102 are provided with extended portions as a margin for cutting. The extending portion having a width L6 becomes an ineffective portion having no electrical function, and becomes an ineffective portion of 2 mm on each of the left and right sides for a total of 4 mm.

  In contrast, the ineffective portion of the collecting electrode 4b1 of the dust collecting portion 4b of this embodiment is 0.02 mm in total because the thickness L2 of the end surface insulating coating surface 4b105 is 10 μm (0.01 mm), and the conductive ink is applied to the insulating sheet. Is extremely small compared to the ineffective portion of 4 mm. As described above, the collecting electrode 4b1 of the dust collecting portion 4b can reduce the ineffective portion that does not contribute to dust collection while preventing discharge by covering with an insulating material, and thus the electric dust collecting device 1 can be downsized. It becomes.

  The above invalid part is compared with specific numerical values. When the effective portions L1 and L5 of the conventional conductive ink 4b100 and the conductive sheet 4b103 of the present invention are both 20 mm, the ratio (L6 / L5) of the ineffective portion L6 to the effective portion L5 in the conventional conductive ink 4b100 is 4 mm / 20 mm. = 0.2, whereas the ratio (L2 / L1) of the ineffective portion L2 to the effective portion L1 in the conductive sheet 4b103 of the present invention is 0.02 mm / 20 mm = 0.001, and the ineffective portion that does not contribute to dust collection The ratio of can be remarkably suppressed.

(Effect of embodiment)
Since it was set as the above structures, this embodiment has the following effects.
Since the collecting electrode 4b1 of the dust collecting portion 4b is coated with an insulating material very thinly such as by printing insulating ink on the conductive sheet 4b103, the ineffective portion that does not contribute to dust collection is only the thickness portion of the insulating ink. The proportion of the ineffective portion can be minimized, and as a result, the electrostatic precipitator can be miniaturized.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 1 ... Air cleaner 2 ... Suction port 3 ... Pre filter 4 ... Electric dust collector 4a ... Charge part 4a1 ... Charge part discharge electrode 4b2 ... Charge part counter electrode 4b ... Dust collection part 4b0 ... Conductor 4b1 ... Dust collection part Collection electrode (collector sheet) (of the present invention)
4b2 ... Dust collecting part collecting electrode (collector sheet) (for background art)
4b100: Conductive ink (for background art)
4b101 ... cover insulation sheet (for background art)
4b102 ... Base insulating sheet (for background art)
4b103 ... conductive sheet 4b104 ... surface insulation coating surface 4b105 ... end insulation coating surface 4b106 ... dust collection part collecting electrode body 4b107 ... body part 4b10 ... projection part 4b10a ... bending part 4b11 ... collection electrode projecting piece 4b11a of the dust collection part ... ground side terminal contact piece 4b2 ... high voltage electrode 4b21 of the dust collection part ... high voltage electrode protruding piece 4b21a of the dust collection part ... high voltage side terminal contact piece 4b3 ... dust collection part case 4b31 ... dust collection part case guide 4b4 ... dust collection part cover 4b41 ... dust collector cover notch 4b5 ... separator 4b6a ... ground terminal 4b6b ... high voltage supply terminal 4b7 ... spacer 5 ... deodorizing filter 6 ... fan 7 ... fan motor 8 ... outlet 9 ... power supply control boards 9a1-9a3 ... charging part Switch 9b ... Dust collector switch 10 ... High voltage power supply 11 for charged part ... High voltage power supply 12 for dust collector ... Operation display board 13 ... Dust Capacitors 14 ... commercial electrodes L1 ... conductive width between the left and right ends of the sheet (the effective portion of the embodiment)
L2 ... thickness of the end face insulation coating surface (ineffective portion of the embodiment)
L3: Thickness of the dust collecting part collecting electrode body (of the embodiment)
L4: Thickness of the collecting electrode of the dust collector (background technology)
L5: Width where conductive ink is printed (effective part of background technology)
L6: Width of the extending portion of the cover insulating sheet and the base insulating sheet (ineffective portion of the background art)

Claims (3)

A charging unit for charging dust by electric discharge;
A high-voltage electrode that is a positive electrode and a collection electrode that is a negative electrode, and by applying a voltage between the high-voltage electrode and the collection electrode, a dust collection unit that collects the dust charged by the charging unit,
With
The electrostatic precipitator, wherein the high-voltage electrode and the collecting electrode are entirely covered with an insulating material. The collection electrode of the dust collection unit has a collection electrode protruding piece to which power is supplied, and the high voltage electrode of the dust collection unit has a high voltage electrode projection piece to which power is supplied,
2. The electrostatic precipitator according to claim 1, wherein the collecting electrode protruding piece and the high-voltage electrode protruding piece are not covered with an insulating material. The electrostatic precipitator according to claim 1, wherein the coating is a coating formed of the insulating material.