JP2008154705A - Air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air filter capable of surely sterilizing with a simple constitution. <P>SOLUTION: The air filter has a first electrode constituted by forming a metal into a grid, a plate which keeps one side face in contact with the first electrode and has a predetermined thickness and through holes penetrating through in a thickness direction, a second electrode which contacts the face of the plate different from the first electrode and which is constituted by forming a metal into a grid, and a power source section applying a predetermined voltage across the first electrode and the second electrode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air filter, and more particularly to an air filter that can be sterilized.

  Conventionally, an air filter is used to remove unnecessary substances in the air. For example, Patent Document 1 discloses a configuration in which a filter medium is disposed and unnecessary substances in the air are blocked by the filter medium.

JP 2006-281997 A

  As described above, in the air filter described in Patent Document 1, the filter medium is disposed, and unnecessary substances are retained on the filter medium by the fineness of the eyes, and unnecessary objects to be removed in the air continue to exist as they are. .

  For this reason, in the case where an unnecessary substance to be removed in the air is a living organism such as a bacterium, it will continue to live on the filter as it is, and the conventional air filter has a hygienic problem.

  In addition, when plasma or discharge is used for sterilization, a high voltage is required, there is a risk of electric shock, adverse effects on the human body due to the generation of ozone, etc., and the apparatus is large and economically problematic. there were.

  The present invention has been made in view of the above points, and an object thereof is to provide an air filter capable of performing reliable sterilization with a simple configuration.

  In order to solve the above-mentioned problems, the present invention has a first electrode in which a metal is formed in a lattice shape, and a surface on one side is in contact with the first electrode, has a predetermined thickness, and penetrates in the thickness direction. A plate having a through-hole, a second electrode in contact with a surface of the plate different from the first electrode, formed of a metal in a lattice shape, and between the first electrode and the second electrode And a power supply unit for applying a predetermined voltage.

  According to the present invention, the electric field strength in the through hole is less than the electric field strength that generates a discharge between the first electrode and the second electrode, and is necessary for sterilization. It is characterized by having a higher electric field strength.

  In the invention according to claim 1, the present invention is characterized in that the first electrode and the second electrode are metals having a bactericidal action by ions.

  ADVANTAGE OF THE INVENTION According to this invention, the air filter which can perform reliable sterilization with simple structure can be provided.

  Moreover, according to this invention, there exists an effect that air sterilization can be performed, consuming almost no electric power.

  Further, according to the present invention, it is possible to provide a sterilization apparatus in which two sterilization actions by strong electric field and ions such as copper are superimposed.

  Further, according to the present invention, since the current is very small, it is safe for the human body and has little risk of electric shock.

  In addition, according to the present invention, the light and simple configuration is simple, the device is easy to manufacture, the material cost is low, and the production cost is low.

  In addition, according to the present invention, a 1.5V dry battery or the like can be used as a power source, a portable size can be realized, and a virus (influenza virus, avian influenza virus, SARS virus, etc.) can be used as a human mask. Can be used for sterilization of various bacteria, pollen removal, and the like.

  In addition, according to the present invention, many types of bacteria such as O-157, Legionella, staphylococci, streptococci, and fungi can be sterilized and can be used for a wide range of applications.

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

  FIG. 1 is a schematic perspective view showing a configuration of an air filter according to an embodiment of the present invention.

  2 is a cross-sectional view of the air filter shown in FIG. 1 taken along the line II-II.

  As shown in FIG. 1, the air filter 1 of the present embodiment includes a filter unit 2 and a power supply unit 3.

  The filter unit 2 is configured by sandwiching the plate 5 between the first electrode 4 and the second electrode 6, and the first electrode 4 and the second electrode 6 are provided facing each other without being in contact with each other.

  The first electrode 4 and the second electrode 6 are formed, for example, by knitting copper wires in a lattice shape. The first electrode 4 and the second electrode 6 have a mesh formed with a fineness of about 162 [mesh / inch], for example. As a material for the first electrode 4 and the second electrode 6, a metal having a bactericidal action by ions such as gold and silver can be used in addition to copper.

  The plate 5 is made of an insulating material and has a through hole 5a over the entire surface. The thickness D of the plate 5 is, for example, 0.1 mm. Any material can be used as the plate 5 as long as it is an insulating material such as a substrate, a rubber plate, or a cloth, and all of the first electrode 4, the second electrode 6, and the plate 5 have flexibility. Since an arbitrary shape can be formed, the filter unit 2 can have various shapes depending on the place where the air filter 1 is installed.

  FIG. 3 is a block diagram showing a configuration of the power supply unit 3 of the air filter 1 shown in FIG.

  The power supply unit 3 includes, for example, a 1.5V dry battery 3c, which is boosted to 300 [V] by a booster 3e via a switch 3d and output. For example, an igniter can be used as the booster 3e. The output voltage Vd boosted to 300 [V] by the booster 3e is applied between the first electrode 4 and the second electrode 6 via the terminals 3b and 3a. However, this applied voltage is a voltage that does not cause a discharge between the first electrode 4 and the second electrode 6.

  The electric field strength E in the through hole 5a of the plate 5 is determined by the voltage Vd between the first electrode 4 and the second electrode 6 and the thickness of the plate 5, that is, the first electrode 4 and the second electrode 6. Using the distance D between the two, it is expressed by Equation 1.

数１に示されるように、本実施の形態のエアフィルタ１では、Ｖｄ＝３００［Ｖ］であり、Ｄ＝０．１［ｍｍ］であるので、プレート５の貫通孔５ａにおける電界強度Ｅが３０［ｋＶ／ｃｍ］となり、殺菌に必要な電界強度として知られている１０［ｋＶ／ｃｍ］を越え、十分な殺菌能力を有する。

As shown in Equation 1, in the air filter 1 of the present embodiment, Vd = 300 [V] and D = 0.1 [mm], so that the electric field strength E in the through hole 5a of the plate 5 is 30 [kV / cm], which exceeds 10 [kV / cm], which is known as the electric field strength necessary for sterilization, and has sufficient sterilization ability.

  The voltage between the electrodes and the distance between the electrodes in the present invention are not limited to those described above, and the electric field strength E may be more than 5 [kV / cm], and preferably an electric field necessary for sterilization. Any value may be used as long as it is calculated by Equation 2 so as to exceed 10 [kV / cm] known as the strength.

すなわち、本発明によるエアフィルタは、それを用いる箇所に収納可能なサイズになるように電極間の距離を定め、その電極間の距離を数２に適用して電極間の電圧を定めるようにすればよい。

That is, in the air filter according to the present invention, the distance between the electrodes is determined so as to be a size that can be accommodated in a place where the air filter is used, and the voltage between the electrodes is determined by applying the distance between the electrodes to Equation 2. That's fine.

  In addition, when the electric field strength at which the bacteria to be sterilized, such as new species of bacteria, are higher than 10 [kV / cm], the distance between the electrodes and the voltage between the electrodes necessary for the sterilization are determined. do it.

  In addition, according to the present invention, the distance D between the electrodes and the voltage Vd between the electrodes can be changed within the range satisfying Equation 2 in accordance with the application and purpose. For example, when D is used for a mask or the like, Can be from 0.1 mm to 10 mm, and in the case of a clean room or sterilization room, about 10 m is preferable.

  FIG. 4 is an enlarged partial sectional view for explaining the principle of sterilization by the electric field of the air filter 1 shown in FIG.

  As described above, in the through hole 5a of the plate 5, an electric field of about 30 [kV / cm] is generated between the first electrode 4 and the second electrode 6 and flows into the through hole 5a. As for the bacteria 71 contained in the air, a voltage is induced in the bacteria 71 and a spark discharge is generated in the bacteria 71. This spark discharge destroys and kills the fungus 71.

  Next, the effect of using copper as the first electrode 4 and the second electrode 6 will be described.

  FIG. 5 is an enlarged partial cross-sectional view illustrating the principle of sterilization with copper ions of the air filter 1 shown in FIG.

Water molecules (H ₂ O) in the air become polarization charges in the electric field (E). Bacteria such as bacteria in the air adhere to the copper mesh (the first electrode 4 and the second electrode 6) by the electrostatic force of the polarization charge of water molecules adhering to the bacteria.

In this attached state, water molecules elute copper ions (Cu ⁺⁺ ) from the copper mesh. The eluted copper ion destroys and kills bacteria attached to water molecules and bacteria attached to the copper mesh (first electrode 4 and second electrode 6) alone.

  FIG. 6 is a schematic cross-sectional view showing a configuration of an air filter according to an embodiment different from FIG. 1 of the present invention.

  In the embodiment shown in FIG. 1, the plate 5 is provided between the first electrode 4 and the second electrode 6 and the sterilization area called the through hole 5a is provided, but the present invention is limited to this. Instead, the air may pass through a plurality of sterilization areas.

  For example, in the configuration shown in FIG. 6, the filter unit 12 sandwiches the plate 15 between the first electrode 14 and the second electrode 16, sandwiches the plate 17 between the second electrode 16 and the third electrode 18, The plate 19 is sandwiched between the third electrode 18 and the fourth electrode 20.

  As shown in FIG. 6, a high voltage from the power supply unit 13 is supplied to each of the electrodes 14, 16, 18, and 20, and a through hole 15 a in the plate 15, a through hole 17 a in the plate 17, and a through hole in the plate 19. In 19a, the same bactericidal effect as the above-mentioned through-hole 5a is obtained.

  In this embodiment, air passes through the three sterilization areas of the through hole 15a, the through hole 17a, and the through hole 19a, and a higher sterilization effect is obtained.

  As described above, according to the present invention, since the power source can be configured with a small dry battery and an igniter, it is very small and can be carried.

  In addition, since the current does not flow between the opposing electrodes like the first electrode and the second electrode, the present invention has little power consumption and is economical.

  The air filter according to the present invention can be applied to all uses that require sterilization in the air, such as a mask for sterilizing air required for breathing humans and animals, and air blown from air conditioners, vacuum cleaners, fans, blowers, and the like. And can be used for sterilization in individual areas such as an aseptic room and a refrigerator.

It is a schematic perspective view which shows the structure of the air filter by one embodiment of this invention. It is II-II sectional drawing of the air filter shown in FIG. It is a block diagram which shows the structure of the power supply part of the air filter shown in FIG. It is a fragmentary sectional enlarged view explaining the principle of the sterilization by the electric field of the air filter shown in FIG. It is a fragmentary sectional enlarged view explaining the principle of the sterilization by the copper ion of the air filter shown in FIG. It is a schematic sectional drawing which shows the structure of the air filter by embodiment different from FIG. 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air filter 2 Filter part 3 Power supply part 3a, 3b Terminal 4 1st electrode 5 Plate 5a Through-hole 6 2nd electrode

Claims (3)

A first electrode in which a metal is formed in a lattice shape;
A plate having a through hole penetrating in the thickness direction, the surface on one side being in contact with the first electrode and having a predetermined thickness;
A second electrode made of a metal in a lattice shape and in contact with a surface of the plate different from the first electrode;
An air filter comprising: a power supply unit that applies a predetermined voltage between the first electrode and the second electrode.   2. The electric field strength in the through-hole is less than an electric field strength that generates a discharge between the first electrode and the second electrode, and more than an electric field strength necessary for sterilization. The air filter described in 1.   2. The air filter according to claim 1, wherein the first electrode and the second electrode are metals having a bactericidal action by ions.

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