JP4774498B2 - Negative ion generator - Google Patents

Description

  The present invention relates to a negative ion generator, and in particular, has an electrode structure that hardly generates harmful substances such as ozone and nitrogen oxides and can stably generate a large amount of negative ions that are safe for a living body. The present invention relates to a negative ion generator.

  As a conventional ion and ozone generator, a needle-like first electrode that is supported by a support and has conductivity, and is detachably attached to the base, and the center substantially coincides with the center of the first electrode. A high DC voltage is applied between the first electrode and the second electrode, and a conductive plate-like second electrode provided with a circular hole arranged at a certain distance from the first electrode. An apparatus including a high voltage generator to be applied is known (Patent Document 1).

  In the ion and ozone generator described above, both the first electrode and the second electrode having conductivity are made of a metal plate, and the tip of the first electrode and the edge of the opening serving as the second electrode, During this period, corona discharge is generated by a high voltage applied between both electrodes, thereby generating ions and ozone. Moreover, the 2nd electrode which has an opening part is attached so that attachment or detachment is possible, and it is set as the structure which the cleaning and washing | cleaning of a 2nd electrode are easy.

  However, the ion and ozone generator of Patent Document 1 generates ions and ozone, and cannot generate only negative ions. That is, since the first electrode and the second electrode are made of metal, the corona discharge generated between the two electrodes is extremely strong discharge, the ionization energy to the air is large, and ozone and nitrogen that are naturally harmful to the living body. A large amount of oxide is generated.

Further, in order to prevent generation of ozone and nitrogen oxides, a negative electrode in which a positive electrode is constituted by a conductive polymer plate material having an electrical resistance value of 10 ⁸ to 10 ¹¹ Ω having a large number of openings. An ion generator is known (Patent Document 2).

This negative ion generator applies a high DC voltage from a DC power source to the positive electrode, and generates a weak corona discharge between the negative electrode and the positive electrode. The positive electrode has a structure having a large number of openings on the same surface, so that negative ions can be generated effectively and in large quantities.
Patent No. 2932365 JP 2002-198160 A

  However, in the negative ion generator of Patent Document 2 described above, negative ions can be generated from the opening portion of the positive electrode, but there are a large number of opening portions on the positive electrode surface made of a conductive polymer. Therefore, there is a problem that the amount of negative ions generated varies depending on the position facing the needle-like negative electrode.

  That is, a large number of apertures on the positive electrode surface provided in an aligned or random position have a diameter of about 3 mm to 5 mm, and the tip of the needle-like negative electrode facing the aperture is both Since there is no fixed positional relationship due to assembly errors such as when the electrodes are assembled, the electrode spacing between the tip of the negative electrode and the positive electrode becomes unstable, resulting in individual differences in the amount of negative ions generated.

  The present invention has been made to solve the above-described problems, and does not generate harmful substances such as ozone and nitrogen oxides, and only a large amount of negative ions that are safe for a living body that does not contain ozone or the like. It aims at providing the negative ion generator which can generate | occur | produce.

In order to achieve the above object, the negative ion generator of the present invention has a single circular opening and has an electrical resistance value (here, expressed by surface resistivity but may be expressed by volume resistivity). It has a plate-like positive electrode made of a conductive polymer material or a ceramic material of 10 ⁹ to 10 ¹² Ω and a needle-like portion, and the tip of the needle-like portion faces the circular opening of the positive electrode. A high voltage direct current is applied between the negative electrode made of metal and the negative electrode and the positive electrode, and a corona discharge with a discharge current of 2.8 μA or less is applied between the negative electrode and the positive electrode. And a voltage applying device that generates negative ions.

The positive electrode of the negative ion generator of the present invention has an electric resistance value of 10 ⁹ Ω or more. By setting the electric resistance value of the positive electrode to 10 ⁹ Ω or more, a large amount of negative ions can be generated without increasing the size of the apparatus.

  In the present invention, when negative ions are generated by the voltage application device, corona discharge is generated between the negative electrode and the positive electrode at a discharge current of 2.8 μA or less. If the discharge current exceeds 2.8 μA, the ionization energy into the air is large, and ozone and nitrogen oxides are generated. Therefore, the discharge current of the corona discharge needs to be 2.8 μA or less or approximately 2.8 μA or less. Further, since corona discharge does not occur when the discharge current is too small, the discharge current is preferably 0.028 μA or more, or approximately 0.028 μA or more.

  Further, since the positive electrode of the negative ion generator of the present invention has a single circular opening, the distance from the tip of the needle-like portion of the negative electrode to the edge of the circular opening is determined for each part of the edge. And negative ions that are safe for living bodies that hardly contain harmful substances such as ozone and nitrogen oxides can be generated stably and in large quantities.

  A large amount of negative ions can be generated stably and efficiently by adding a fragrance component comprising a natural fragrance or artificial fragrance to the positive electrode of the negative ion generator of the present invention, and at the same time selected. A scent having a fragrance can be generated.

  In the present invention, when the distance between the tip of the needle-like portion of the negative electrode and the edge of the circular opening of the positive electrode is L, and the diameter of the circular opening of the positive electrode is D, D and L The positive electrode and the negative electrode can be arranged so that the relative ratio of D / L = 2 or D / L≈2.

  In the present invention, the shape of the edge of the circular opening of the positive electrode may be formed such that the thickness gradually decreases toward the tip. Thereby, the tip of the edge portion of the positive electrode has a sharp shape, and the potential gradient with respect to the corona discharge generated between the two electrodes is large, so that a large amount of negative ions can be generated with a lower applied voltage.

As described above, according to the present invention, the positive electrode has a single circular opening and is made of a conductive polymer material or ceramic material having an electric resistance value of 10 ⁹ to 10 ¹² Ω. There is an effect that no harmful substances such as ozone and nitrogen oxides are generated, and that only a large amount of negative ions that are safe for a living body not containing ozone or the like can be generated.

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

  As shown in FIGS. 1 and 2, a cylindrical insulating base 12 made of an insulating resin or the like is fixed on the upper surface of the plate-shaped insulating base 10 so as to be orthogonal to the upper surface of the insulating base 10. Yes.

  A metal negative electrode 14 having a plate-like main body portion 14A and a needle-like portion 14B protruding from the main body portion 14A is fixed to the upper surface of the insulating base 12 with screws or the like. The negative electrode is formed of a metal that hardly corrodes, such as stainless steel, and can be formed by, for example, a method of punching a stainless steel plate having a thickness of about 0.1 mm into the shape of the negative electrode 14 or electric discharge machining. Since the negative electrode only needs to have a needle-like portion, the main body portion may be omitted and the whole may be formed in a needle shape and fixed to the upper surface of the insulating table 12.

  A plate-like positive electrode 16 having a single circular opening 16A formed on the side surface of the plate-like insulating base 10 so that the circular opening 16A faces the tip of the needle-like portion of the negative electrode 14. It is fixed to.

The positive electrode 16 is made of a conductive polymer material such as a conductive resin to which an electric resistance value is adjusted to a value within a range of 10 ⁹ to 10 ¹² Ω by adding carbon, a conductive filler, or the like.

  The main body portion 14A of the negative electrode 14 is connected to the negative end of the high-voltage DC negative power source 18 via a negative lead wire, and the lower end portion of the plate-like positive electrode 16 is the positive end of the high-voltage DC negative power source 18, that is, ground. It is connected to the side via a positive lead wire.

  The negative electrode 14 and the positive electrode 16 are arranged such that the tip of the needle-like portion 14A is positioned on a straight line passing through the center of the circular opening 16A of the positive electrode, that is, the tip of the needle-like portion of the negative electrode and the circular opening. The distance L from the edge portion on the negative electrode side is the same in each portion of the edge portion. Thereby, since the discharge distance between electrodes becomes the same in any part between electrodes, a negative ion can be generated stably.

  The generated negative ions can be taken out from the opening 16A of the positive electrode 16 by riding on the ion wind by the Coulomb force acting between the negative electrode 14 and the positive electrode 16. Although not shown, if a blower such as a fan is provided behind the negative electrode 14 and the air is blown from the negative electrode toward the opening of the positive electrode, a large amount of negative ions can be taken out efficiently.

In the present embodiment, since the positive electrode 16 is made of a conductive polymer material having an electric resistance value of 10 ⁹ to 10 ¹² Ω, a DC high voltage is applied between the negative electrode 14 and the positive electrode 16. When corona discharge is caused between the two electrodes, the corona discharge generated between the two electrodes can be made extremely small with a discharge current I of 0.028 μA or more and 2.8 μA or less. By making it smaller, the ionization energy into the air is reduced, and no harmful substances such as ozone and nitrogen oxides are generated. Therefore, only a large amount of negative ions that are safe for a living body that does not contain ozone or the like can be generated.

  In the above embodiment, the distance between the tip of the tip of the negative electrode 14 and the edge 16B on the negative electrode side of the circular opening 16A of the positive electrode 16 is L, the diameter of the circular opening is D, and high voltage negative A voltage of −2800 V is applied from the power source 18 between the negative electrode 14 and the positive electrode 16 to cause corona discharge between the electrodes with a discharge current of 0.1 μA or more to generate negative ions. As shown in Fig. 1, the result of measuring the amount of negative ions generated (number of negative ions per unit volume (1 cc)) by setting a commercially available general ion counter 20 at a position 1 m away from the positive electrode 16. Is shown in Table 1. The negative ion measurement environment was a room temperature and humidity environment that was stable.

  From Table 1, for example, under the conditions of L = 6.5 mm and D = 4.0 mm, the number of negative ions is 10,000 / cc, and when L = 6.5 mm and D = 13.0 mm, the number of negative ions is 70. It was 10,000 pieces / cc.

  Further, the ratio D / L between the diameter D of the circular opening of the positive electrode and the distance L between the tip of the negative electrode tip and the negative electrode side edge of the circular opening is taken on the horizontal axis, and minus on the vertical axis. FIG. 4 shows the relationship between the ratio D / L and the amount of negative ions generated by taking the amount of generated ions. As can be seen from FIG. 4, the amount of negative ions generated is the maximum under the conditions of D / L = 2, that is, L is 6.5 mm and D is 13.0 mm. That is, when the tip of the negative electrode 14 is located at the center of a circle whose circumference is the edge of the positive electrode 16 on the negative electrode side, the generated negative ions show the maximum value.

  Accordingly, the negative electrode is set so that the distance between the tip of the needle-like portion of the negative electrode and the edge of the circular opening of the positive electrode is a minimum value, that is, the ratio D / L is D / L = 2. By arranging the positive electrode and the positive electrode, the distance between the two electrodes becomes the shortest distance along the electric field line evenly around the circumference, so that the maximum amount of negative ions can be stably generated.

  When the negative ion generation amount is set to a value in the vicinity of the maximum value, the distance between the tip of the needle-like portion of the negative electrode and the edge of the circular opening of the positive electrode is within a predetermined range including the minimum value. In other words, the negative electrode and the positive electrode may be arranged so that D / L≈2.

  As described above, when the positive electrode 16 is formed in a thick plate shape, the tip of the tip of the negative electrode is located at the center of a circle whose circumference is the negative electrode side edge of the circular aperture of the positive electrode. Since the electric lines of force extend straight from the tip of the negative electrode 14 to the edge 16B of the positive electrode 16, the corona discharge path at the shortest distance is ensured. Further, when the positive electrode 16 is formed in a very thin plate shape, the entire circumferential surface of the circular opening can be regarded as an edge, so that the tip of the tip of the negative electrode 14 is simply the circular opening of the positive electrode 16. What is necessary is just to be located in the center of 16A.

  Next, a second embodiment of the present invention will be described. In this embodiment, the tip of the edge portion is formed into a sharp shape by forming the circular opening of the positive electrode so that the thickness gradually decreases toward the tip. The opening in FIG. 5 is formed in a truncated cone shape whose diameter gradually increases from the surface on the negative electrode side of the positive electrode toward the surface on the opposite side to the negative electrode. Thereby, it forms in the shape which cut the single side | surface of the edge part of the positive electrode formed in the thick plate shape, and the edge part 22 with a sharp tip part is formed in the negative electrode side of the positive electrode. And the front-end | tip of the front-end | tip part of the negative electrode 14 is arrange | positioned in the center of the circle | round | yen which makes this edge part a circumferential surface.

  FIG. 6 shows a modification of the present embodiment. The circular opening of the positive electrode extends from the center in the thickness direction of the positive electrode toward both the surface on the negative electrode side and the surface on the opposite side to the negative electrode. The diameter is gradually increased, and as a result, an edge portion 24 having a sharp tip is formed at the center in the thickness direction of the positive electrode. In other words, the opening of the positive electrode is cut into a V-shaped cross section, and the tip of the tip of the negative electrode 14 is arranged at the center of a circle whose circumference is the edge.

  5 and 6, the facing position between the edge of the circular opening of the positive electrode 16 and the tip of the tip of the negative electrode 14 can be set to the shortest distance, and the positive electrode having a sharp edge can be formed. Corona discharge voltage can be lowered, and generation of harmful substances such as ozone and nitrogen oxides can be eliminated.

  According to the present embodiment, the tip of the edge portion of the positive electrode has a sharp shape, and the potential gradient with respect to the corona discharge generated between both electrodes is increased. Therefore, a large amount of negative ions can be efficiently generated with a lower applied voltage. Can occur. In addition, lowering the applied voltage can moderate corona discharge, further suppress the generation of ozone and nitrogen oxides, and improve safety.

  Next, a third embodiment will be described. Since this embodiment is obtained by changing only the positive electrode of each of the above embodiments, only differences from the above embodiments will be described.

The positive electrode of the present embodiment uses a conductive polymer material having a single circular opening as in the above embodiments, and having an electric resistance value of 10 ⁹ to 10 ¹² Ω. It is configured by adding a natural fragrance, an artificial fragrance or the like to a conductive polymer material.

  The positive electrode has a fragrance component made of a natural fragrance or an artificial fragrance added to the conductive polymer material, so that the fragrance component contained in the positive electrode is stimulated by the corona discharge current I flowing through the positive electrode, A large amount of negative ions and incense can be generated simultaneously, creating an effective relaxation space.

  According to this embodiment, when a DC high voltage is applied between the negative electrode and the positive electrode to generate a corona discharge between the two electrodes, negative ions and scent components are simultaneously generated from the circular opening of the positive electrode. Can be generated.

(A) is a front view of the positive electrode of the first embodiment of the present invention, and (B) is a cross-sectional view of the first embodiment. It is the perspective view which abbreviate | omitted the high voltage negative power supply of the said 1st Embodiment. It is a figure which shows the state which measures the generation amount of the negative ion of the said 1st Embodiment. It is a characteristic view which shows the relationship between the generation amount of negative ion, and ratio D / L. It is a fragmentary sectional view which shows the 2nd Embodiment of this invention. It is a fragmentary sectional view showing the modification of a 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Insulation base 12 Insulation base 14 Negative electrode 14A Body part 14B Needle-like part 16 Positive electrode 16A Circular opening part 16B Edge part 18 High voltage negative power supply

Claims (3)

A plate-like positive electrode having a single circular opening and made of a conductive polymer material or ceramic material having an electric resistance value of 10 ⁹ to 10 ¹² Ω;
A metal negative electrode having a needle-like portion, the tip of the needle-like portion being arranged so as to face the circular opening of the positive electrode;
A voltage application device that applies a DC high voltage between the negative electrode and the positive electrode, and generates negative ions between the negative electrode and the positive electrode by corona discharge with a discharge current of 2.8 μA or less; Including
The negative ion generator which made the shape of the edge part of the said positive electrode which forms the said circular opening part the shape which thickness becomes thin gradually toward the front-end | tip part of this edge part .   The negative ion generator of Claim 1 which provided the natural fragrance | flavor or artificial fragrance | flavor to the said positive electrode.   When the distance between the tip of the needle-like portion of the negative electrode and the edge of the circular opening of the positive electrode is L and the diameter of the circular opening of the positive electrode is D, the relative ratio of D and L is D The negative ion generator according to claim 1 or 2, wherein the positive electrode and the negative electrode are arranged so that / L = 2 or D / L≈2.

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