JP2010089088A - Electrostatic atomizing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dewing type electrostatic atomizing device that generates ion mist having sterilizing, deodorizing, and allergen-removing capability by using a discharge electrode with excellent electric conductivity and high thermal conductivity. <P>SOLUTION: The electrostatic atomizing device includes: a discharge electrode 1 composed of silver or silver alloy; a heat sink 3 that cools the discharge electrode 1 to dew-condensate moisture in the air; and a means for electrifying dew-condensed water at the tip end of the discharge electrode 1 and applying thereto a high voltage forming a Taylor cone shape and causing Rayleigh disintegration. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrostatic atomizer that generates nanometer-sized ion mist by an electrostatic atomization phenomenon.

  Conventionally, a discharge electrode part, a counter electrode part positioned opposite the discharge electrode part, and a supply means for supplying water to the discharge electrode part are provided, and a high voltage is applied between the discharge electrode part and the counter electrode part. Patent Document 1 discloses an electrostatic atomizer that atomizes water held in a discharge electrode portion to generate ion mist.

However, the conventional electrostatic atomizer shown in Patent Document 1 is a suction-type electrostatic atomizer in which water accumulated in a water storage section is transported to the tip of a discharge electrode section using a capillary phenomenon. This is a device, and there is a problem that the user has a trouble of having to add one after another if the water in the water storage part is exhausted, which is inconvenient. In the above electrostatic atomizer, when the water to be supplied is water containing impurities such as Ca and Mg such as tap water, the impurities react with CO ₂ in the air to form a water transport unit. CaCO ₃ , MgO, or the like is deposited on the tip of the glass to inhibit water supply due to capillary action, and impurities are clogged in the capillary, preventing the generation of ion mist for these reasons.

  Therefore, in order to solve the above problem, in the course of reaching the present invention, the inventor cools the air by the endothermic body to condense moisture in the air to generate dew condensation water, which is used as the discharge electrode unit. Or the moisture in the air is cooled and condensed directly on the discharge electrode part to generate condensed water on the discharge electrode part, and the condensed water generated on the discharge electrode part is formed in the air by electrostatic atomization. Has developed a condensation-type electrostatic atomizer that emits ion mist.

Japanese Patent No. 3260150

  In the dew condensation type electrostatic atomizer, the present invention generates an ion mist having sterilization, deodorization, and allergen removal performance using a discharge electrode portion having good electrical conductivity and high thermal conductivity. Is an issue.

  In order to solve the above-described problems, an electrostatic atomizer according to the present invention includes a discharge electrode portion 1 made of silver or a silver alloy, and a heat absorber that cools the discharge electrode portion 1 to condense moisture in the air. 3, and means for charging the water condensed at the tip of the discharge electrode unit 1 and applying a high voltage to the discharge electrode unit 1 in a Taylor cone shape and causing Rayleigh splitting. It is what.

  Moreover, it is preferable that the air hole 18 is provided in the side surface of the housing 14 in which the said discharge electrode part 1 was equipped.

  It is also preferable to further include a grounded electrode portion different from the discharge electrode portion 1.

  The present invention relates to a dew-type electrostatic atomizer, a discharge electrode part made of silver or a silver alloy as described above, and a heat absorber that cools the discharge electrode part to condense moisture in the air. Means for charging the water condensed at the tip of the discharge electrode part, and applying a high voltage to the discharge electrode part that causes a Rayleigh split in the shape of a Taylor cone. In addition, an ion mist having sterilization, deodorization, and allergen removal performance can be generated using a discharge electrode portion having high thermal conductivity.

It is a perspective view of one embodiment of the electrostatic atomizer of the present invention. It is a top view same as the above. It is sectional drawing of the AA line of FIG. 2 same as the above. It is sectional drawing of the BB line of FIG. 2 same as the above. It is a perspective view of other embodiment of the electrostatic atomizer of this invention. It is a top view of other embodiment of the electrostatic atomizer of this invention. It is sectional drawing of the AA line of FIG. 6 same as the above. It is sectional drawing of other embodiment of the electrostatic atomizer of this invention. It is a graph which shows the discharge | release ion amount measurement result by a differential electrostatic classification device (DMA).

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The electrostatic atomizer 2 of the present invention is composed of two or more discharge electrode portions 1, a heat absorber 3 for cooling these discharge electrode portions 1, and a counter electrode portion 4. A Peltier module 10 is used as the heat absorber 3 for cooling the discharge electrode portion 1.

  Two or more discharge electrode portions 1 are provided on a single electrode member 11, and the electrode member 11 connects a plurality of electrode rods 5 to a base portion 6 through a branch portion 8 from a base portion 6 cooled by an endothermic body 3. A plurality of electrode rods 5 are formed as projecting integrally in the opposite direction. In the embodiment shown in the accompanying drawings, the base portion 6 of the electrode member 11 is formed by providing a large-diameter bottom surface portion 6a having a larger area than the narrow neck portion 6b at one end portion of the narrow neck portion 6b, and the large-diameter bottom surface portion of the narrow neck portion 6b. A branch portion 8 is provided at the end opposite to 6a.

  Here, the plurality of electrode rods 5 that are branched from the base 6 via the branching portion 8 are symmetrical with respect to the branching point 7 that is the center of the branching portion 8 from the base 6 (the embodiment of FIG. 2). In the example in which the two electrode rods 5 are branched and protruded through the branching portion 8 as described above, the two electrode rods 5 are 180 ° rotationally symmetric. When the projection 5 is branched and projected, the three electrode rods 5 are rotationally symmetrical to each other by 120 °. Further, the portions constituting each electrode rod 5 are formed of the same material. . In this case, the entire electrode member 11 including all the electrode bars 5 may be formed of the same material, and all the electrode bars 5 are formed of the same material, and the base 6 having the tip portion formed as the branching portion 8 is used as the electrode rod. 5 may be formed as a separate member, and a plurality of electrode rods 5 may be fixed to the branch portion 8. By comprising in this way, the thermal resistance of the discharge electrode part 1 of each front-end | tip part of the some electrode rod 5 can be unified, and the temperature distribution of each discharge electrode part 1 can be made substantially the same. Thereby, the several discharge electrode part 1 can be provided in the single electrostatic atomizer 2 without enlarging the dimension of an apparatus.

  The Peltier module 10 constituting the heat absorber 3 is formed by facing a pair of Peltier circuit boards having a circuit formed on one side of an insulating plate made of alumina or aluminum nitride having high thermal conductivity so that the circuits face each other. The BiTe-based thermoelectric elements arranged in multiple rows are sandwiched between the two Peltier circuit boards, and the adjacent thermoelectric elements are electrically connected by the circuits on both sides, and the energizing connector 19 provided in the Peltier module 10 is connected to Heat is transferred from one Peltier circuit board side to the other Peltier circuit board side by energization of a thermoelectric element made through a connected Peltier input lead wire.

  The outside of the Peltier circuit board on the cooling side of the Peltier module 10 is connected to a cooling insulating plate 12 made of alumina, aluminum nitride or the like with high thermal conductivity and high electric resistance through thermal conductive grease or the like, In addition, a high heat conductive heat dissipating portion 13 made of alumina, aluminum nitride or the like is connected to the outside of the Peltier circuit board on the other side (hereinafter referred to as the heat radiating side) via a heat conductive grease or the like. The heat dissipating part 13 is provided with a heat dissipating fin part 13a so that the electrode rod 5 can be cooled efficiently.

  The Peltier module 10 and the electrode member 11 constituting the heat absorber 3 are housed in the housing 14.

  The housing 14 includes a Peltier side housing part 14a and an electrostatic atomization side housing part 14b. The base 6 of the Peltier module 10 and the electrode member 11 is housed inside the Peltier-side housing portion 14a, and the large diameter of the end of the base 6 of the electrode member 11 is provided on the cooling insulating plate 12 provided on the cooling side of the Peltier module 10. The bottom surface portion 6a is in surface contact. The Peltier side housing portion 14 a of the housing 14 is fixed to the heat radiating portion 13.

  The narrow neck portion 6b of the base portion 6 of the electrode member 11 passes through a hole provided in a partition portion that partitions the Peltier side housing portion 14a and the electrostatic atomization side housing portion 14a, and branches into the electrostatic atomization side housing portion 14a. 8 and a plurality of electrode rods 5 protruding through the branching portion 8 are arranged.

  Here, in order to maintain a stable discharge in each discharge electrode portion 1, it is desirable to take a sufficient distance between the electrode rods 5, and a distance of 5 mm or more is preferable. In the embodiment, the distance between the electrode bars 5 is 10 mm.

  In the embodiment shown in the accompanying drawings, the Peltier-side housing portion 14a and the electrostatic atomizing-side housing portion 14b are separate from each other, and the upper bottom surface portion of the Peltier-side housing portion 14a is below the electrostatic atomizing-side housing portion 14b. The housing 14 is configured by overlapping the bottom surface portion and fixed by the fixing means (in this case, a partition is formed by the upper bottom surface portion of the Peltier side housing portion 14a and the lower bottom surface portion of the electrostatic atomizing side housing portion 14b. However, the Peltier side housing part 14a and the electrostatic atomization side housing part 14b may be integrally formed to form the housing 14.

  A lead plate 16 for energization is electrically connected to the base 6 of the electrode member 11. The connecting portion of the lead plate 16 to the electrode member 11 is located between the large-diameter bottom surface portion 6 a of the base portion 6 and the branch portion 8. Thereby, the temperature distribution from the branch part 8 to each discharge electrode part 1 becomes equal, and the amount of dew condensation in each discharge electrode part 1 can be made equal.

  A counter electrode portion 4 provided with an ion emission opening 17 is provided at an appropriate distance from the tip of each discharge electrode portion 1 at the tip of each electrode rod 5. It is fixed to the atomizing side housing part 14b.

  The counter electrode part 4 is composed of one counter electrode plate 15 having an opening 17 for ion emission, and the distance from the tip of each discharge electrode part 1 to the counter electrode plate 15 is made equal. Thus, a high voltage is applied between each discharge electrode portion 1 and the counter electrode portion 4 to generate electric field strength and electric lines of force equal to the respective discharge portions.

  The embodiment shown in FIGS. 1 to 4 is an example in which two discharge electrode portions 1 are provided, and two counter electrode plates 15 are provided with two ion emission openings 17 whose edges are the counter electrode portions 4. The two discharge electrode portions 1 are arranged so as to correspond to the two ion emission openings 17 respectively. Here, the two ion emission openings 17 are formed by circular holes having the same diameter, and the respective discharge electrode portions 1 are arranged at the centers of the circles of the respective ion emission openings 17.

  An air hole 18 is provided in the side surface of the electrostatic atomization side housing portion 14b in order to efficiently release the generated ions.

  Although not shown, when a high voltage is applied to the discharge electrode portion 1 side, it is necessary to seal the periphery of the cooling insulating plate 12 and the electrode member 11 with an insulating resin. That is, by sealing with an insulating resin as described above, leakage of water to the Peltier module 10 and the heat radiation fin portion 13a due to water condensed on the electrode rod 5 when a high voltage is applied is prevented.

  Next, the material of each member will be described. As the electrode member 11, silver, which is a material having good electrical conductivity and high thermal conductivity, or an alloy thereof is used. The cooling insulating plate 12 is preferably made of a material having high thermal conductivity and high electrical insulation, and for example, a material such as alumina or aluminum nitride is preferable. The counter electrode plate 15 constituting the counter electrode portion 4 requires a material having electrical conductivity, and is preferably a metal or resin exhibiting electrical conductivity. In the embodiment, SUS is used. The housing 14 is preferably made of an insulating material and has a low thermal conductivity in order to prevent heat loss. For example, a resin such as ABS, PPS, or PBT is preferable. As the heat radiating portion 13 having the heat radiating fin portion 13a, a material having high thermal conductivity is desirable, and for example, aluminum, copper, or the like is preferable. Further, as the sealing resin, epoxy resin, polyamide resin, urethane resin, and the like are effective.

  The principle of generating ion mist is as follows. First, the Peltier module 10 is energized to cool the electrode member 11 having the plurality of electrode bars 5 together with the cooling insulating plate 12. When the electrode rod 5 falls below the dew point temperature, moisture in the air begins to condense on the electrode rod 5, and dew condensation water is generated at each discharge electrode portion 1 at the tip of each electrode rod 5. When the condensed water is sufficiently generated in each discharge electrode portion 1 in this way, a high voltage is applied between each discharge electrode portion 1 and the counter electrode portion 4. When a high voltage is applied between each discharge electrode unit 1 and the counter electrode unit 4, the dew condensation water generated at the tip of each discharge electrode unit 1 is charged, and the Coulomb force acts on the charged dew condensation water, Condensed water rises into a cone with a sharp tip (Taylor Cone). If the voltage applied at this time exceeds the surface tension of water and is a high voltage that can cause splitting and scattering (Rayleigh splitting), the condensed water generated in the discharge electrode portion 1 becomes a Taylor cone shape and becomes a Rayleigh. Electrostatic atomization that causes splitting and generation of nanometer-sized ion mist is performed and released into the atmosphere.

  The nanometer-size ion mist generated in this way is a nanometer-size ion mist with active species (hydroxy radicals, superoxide, etc.). In addition, it is possible to remove odors attached to the wall surface, clothing, etc., in addition to the wall surface, clothing, etc. In addition to such adhesion deodorizing performance, there are further allergen removal performance, sterilization performance, etc.

  In this case, in order to release mist containing negative ions, the counter electrode plate 15 constituting the counter electrode portion 4 is grounded, and a negative high voltage is applied to the electrode member 11 having the plurality of electrode rods 5, or A positive high voltage may be applied to the counter electrode plate 15 constituting the counter electrode unit 4 to ground the electrode member 11 having the plurality of electrode rods 5. In order to release mist containing positive ions, the counter electrode plate 15 constituting the counter electrode portion 4 is grounded, and a positive high voltage is applied to the electrode member 11 having the plurality of electrode rods 5 or What is necessary is just to apply a negative high voltage to the counter-electrode board 15 which comprises the counter electrode part 4, and to earth | ground the electrode member 11 which has the some electrode rod 5. FIG.

  In the above description, the electrostatic atomizer 2 having two discharge electrode portions 1 has been described with reference to FIGS. 1 to 4. However, the electrostatic atomizer 2 is provided with three or more discharge electrode portions 1. In this case, the amount of ion mist released is further increased. The structure of the electrostatic atomizer 2 provided with three or more discharge electrode portions 1 is basically the same as the electrostatic atomizer 2 provided with two discharge electrode portions 1 described above, the shape of the electrode member 11, The shape of the counter electrode plate 15 constituting the counter electrode unit 4 and the shape of the housing 14 for fixing each member are different. As an example of this, FIG. 5 shows an example of an electrostatic atomizer 2 having three discharge electrode portions 1. In the embodiment shown in FIG. There are provided three ion emission openings 17 serving as the portions 4, and the three counter electrode portions 4 are opposed to the three discharge electrode portions 1, respectively. The distances up to 4 are equal.

  In each of the above-described embodiments, an example is shown in which each of the discharge electrode portions 1 is opposed to each discharge electrode portion 1 and each of the opening portions 17 for ion emission whose edge portion becomes the counter electrode portion 4 is provided. As shown in FIG. 1, one ion emission opening 17 is provided for a plurality of discharge electrode parts 1, and each discharge electrode part 1 is arranged concentrically from the center of the circle of the ion emission opening 17. They may be arranged at intervals. However, in order to improve the efficiency of generating ion mist emitted from each discharge electrode portion 1, it is desirable to provide one ion emission opening 17 for each discharge electrode portion 1.

  Moreover, as shown in FIG. 8, you may cover all or one part from the branch part 8 to the base of the electrode stick 5 with the heat insulating material 9 with low heat conductivity. Thereby, generation | occurrence | production of excessive dew condensation water can be prevented, and the electric leakage by excessive dew condensation and water dripping can be prevented. Effective materials for the heat insulating material 9 include resin heat insulating materials such as urethane resin and phenol resin, fiber heat insulating materials such as glass wool and ceramic fibers, and heat insulating paints mixed with ceramic.

  FIG. 9 is a comparison of the amount of released ion mist measured by a differential electrostatic classifier (DMA) when a plurality of discharge electrode portions 1 are provided. The discharge conditions of each discharge electrode part 1 were made the same, and it adjusted to the electric field strength of about 5 * 107 (V / m), and performed the stable electrostatic atomization in each discharge part. From this result, it can be seen that when the discharge electrode portion 1 is increased, the amount of ion mist released is increased accordingly. Thereby, adhesion deodorization performance, allergen removal performance, sterilization performance, etc. improve.

DESCRIPTION OF SYMBOLS 1 Discharge electrode part 3 Endothermic body 14 Housing 18 Air hole

Claims (3)

  A discharge electrode portion made of silver or a silver alloy, a heat absorbing body that cools the discharge electrode portion to condense moisture in the air, and water that is condensed on the tip of the discharge electrode portion is charged to form a Taylor cone. Means for applying to the discharge electrode part a high voltage that causes a Rayleigh split in shape.   The electrostatic atomizer according to claim 1, wherein an air hole is provided in a side surface of the housing in which the discharge electrode portion is housed. The electrostatic atomizer according to claim 1, further comprising a grounded electrode portion different from the discharge electrode portion.

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