JP2013165006A - Ion generating element and ion generator provided with same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve: an ion generating element including an electrode arranged in such a manner that generated ions are not easily absorbed by the electrode and capable of preferentially generating either positive or negative ions; and an ion generator provided with the ion generating element.SOLUTION: An ion generating element of the present invention includes a linear first electrode 3 and a linear second electrode 4 that generate ions by a corona discharge. The first electrode 3 and the second electrode 4 preferentially generate either positive or negative ions.

Description

  The present invention relates to an ion generating element and an ion generating device mounted on an air purifier or the like.

  A technique for generating ions by corona discharge is used in various fields such as a static eliminator, a charging device, an air cleaning device, and an electrostatic precipitator.

  For example, Patent Document 1 describes a negative ion generator using corona discharge, and FIG. 9 is a perspective view of the negative ion generator according to Patent Document 1. Here, it includes a positive electrode 101 having a single circular opening, and a negative electrode 102 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, The electrode 101 is connected to the positive end of the high voltage DC power source, that is, the ground side, and the negative electrode 102 is connected to the negative end of the high voltage DC power source. In this configuration, a DC high voltage is applied between the positive electrode 101 and the negative electrode 102 to cause corona discharge between the two electrodes to generate negative ions.

  Patent Document 2 describes a static eliminator that neutralizes static electricity charged on an electronic component or the like, and FIG. 10 is a configuration diagram of the static eliminator according to Patent Document 2. Here, the electrodes 103 and 104 are provided, and the tips of the respective electrodes are provided so as to face each other. The electrode 103 is connected to the positive terminal of the power source 105 and emits positive ions when a positive voltage is applied. On the other hand, the electrode 104 is connected to the negative terminal of the power source 105 and emits negative ions when a negative voltage is applied. Ions emitted from the electrode 103 and the electrode 104 are sent to the static elimination object by the blowing means 106.

JP 2006-185740 A (released July 13, 2006) JP 2011-60537 A (published March 24, 2011)

  However, in the negative ion generator of Patent Document 1, the negative ions generated by the corona discharge have a large area of the positive electrode 101 connected to the ground, and thus the negative ions generated at the needle-like portion of the negative electrode 102. However, there is a problem that the positive electrode 101 is easily absorbed. Moreover, in the static elimination apparatus of patent document 2, since the positive high voltage and the negative high voltage are applied in order to generate discharge with the electrode 103 and the electrode 104, the positive ion discharge | released by the electrode 103 is negative. Negative ions absorbed by the electrode 104 to which a voltage is applied and released by the electrode 104 are absorbed by the electrode 103 to which a positive electrode is applied. As a result, there is a problem that the amount of ions delivered to the static elimination object is reduced.

  The present invention has been made in view of such problems, and an object thereof is to arrange the electrodes so that the generated ions are not easily absorbed by the electrodes, and give priority to either positive or negative ions. An object of the present invention is to realize an ion generating element that can be generated and an ion generating apparatus including the same.

  An ion generating element according to the present invention is an ion generating element including a linear first electrode and a linear second electrode that generate ions by corona discharge, and includes the first electrode and the second electrode. Is configured to preferentially generate either positive or negative ions.

  Further, the first electrode and the second electrode may be arranged to face each other so that projected areas when the other electrode is viewed from one electrode overlap each other. Further, the first electrode and the second electrode may have a needle-like shape at the tip.

  An ion generator according to the present invention includes an ion generating element including a linear first electrode and a linear second electrode, a first power source connected to the first electrode, and a second electrode. A difference between the absolute value of the voltage applied to the first electrode and the absolute value of the voltage applied to the second electrode is 3 kV or more, and the first electrode and the second electrode It is characterized in that corona discharge is caused by the voltage difference of.

  In addition, either positive or negative voltage may be applied to either the first electrode or the second electrode, and no voltage may be applied to the other electrode. In addition, a voltage having the same polarity may be applied to the first electrode and the second electrode. Moreover, it is good also as providing the ventilation means arrange | positioned so that a wind may be sent between a 1st electrode and a 2nd electrode.

  Further, a pulse voltage may be applied to either the first electrode or the second electrode, and a DC voltage of 30 to 60% of the maximum value of the pulse voltage may be applied to the other electrode.

  According to the present invention, an electrode is arranged so that generated ions are not easily absorbed by the electrode, and an ion generating element capable of preferentially generating either positive or negative ions and an ion generator provided with the same An apparatus can be realized.

It is sectional drawing which shows the structure of the ion generator which concerns on Embodiment 1. FIG. It is sectional drawing which shows an example of arrangement | positioning of a 1st electrode and a 2nd electrode. It is a voltage wave form diagram to the 1st electrode and the 2nd electrode. It is sectional drawing which shows the structure of the ion generator which concerns on Embodiment 2. FIG. It is a figure which shows the specific experimental apparatus which performed the measurement experiment of the ion generator which concerns on an Example. 3 is a measurement experiment result according to Example 1. FIG. 6 is a voltage waveform diagram for each electrode according to Example 2. FIG. It is a measurement experiment result which concerns on Example 2. FIG. It is a perspective view which shows the structure of the negative ion generator which concerns on patent document 1 which is a prior art. It is sectional drawing which shows the structure of the static elimination apparatus which concerns on patent document 2 which is a prior art.

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

Embodiment 1
FIG. 1 is a cross-sectional view showing a configuration of an ion generator 1 in one embodiment of the present invention. The ion generator 1 includes a housing 2, a first electrode 3, a second electrode 4, a first power supply 5, a second power supply 6, and a blowing means 7.

  The housing 2 has a hollow structure, and an emission port 8 for emitting ions to the outside of the ion generator 1 is formed at one end thereof. Inside the housing 2 is an air passage through which ions pass, and the ions that have passed through the air passage are discharged from the discharge port 8 to the external space of the ion generator 1. The casing 2 is made of a resin such as polystyrene, polycarbonate, or acrylic, or a copper or aluminum metal having high conductivity, workability, and versatility, and may be a single layer of resin or metal, and each layer is overlapped. Multiple layers may be used.

  The 1st electrode 3 and the 2nd electrode 4 consist of a linear conductive member, comprise an ion generating element in a pair, produce a corona discharge between both electrodes, and bear the role which produces | generates ion. By making the first electrode 3 and the second electrode 4 into a linear shape, electric field concentration is more likely to occur than when the first electrode 3 and the second electrode 4 are formed into a plate shape or a ring shape. And the distance between the second electrodes 4 can be increased. When the separation distance between the first electrode 3 and the second electrode 4 is large, the generated ions are less likely to be absorbed by the electrode than when the separation distance is small. As a result, ions can be generated efficiently.

  FIG. 2 is a cross-sectional view showing an example of the arrangement of the first electrode 3 and the second electrode 4. In FIG. 2A, the first electrode 3 and the second electrode 4 are fixed substantially perpendicular to the housing 2, and are arranged so as to overlap the projected areas when the other electrode is viewed from one electrode. Has been. In FIG. 2B, the first electrode 3 and the second electrode 4 are arranged to be inclined with respect to the housing 2, and in FIG. 2C, the first electrode 3 and the second electrode 4 are mutually connected. These electrodes are parallel to each other and are also arranged to be parallel to the housing 2. In each arrangement, corona discharge can be generated and ions can be generated, but it is preferable that the tips of both electrodes are arranged opposite to each other as shown in FIG. In the case of the arrangement as shown in FIG. 2C, since the area of the other electrode visible from the tip of one electrode is large, the generated ions are easily absorbed by the other electrode. Therefore, more ions can be generated by arranging the tips of the electrodes so as to face each other as shown in FIG.

  The first electrode 3 and the second electrode 4 may have a needle shape or a spherical shape or an edge portion at the tip, but have a needle shape at the tip as shown in FIGS. preferable. By forming the tip in a needle shape, corona discharge is more likely to occur, so that many ions can be generated at a low voltage.

  Moreover, it is preferable that the separation distance of the front-end | tip of the 1st electrode 3 and the front-end | tip of the 2nd electrode 4 is 1.5 cm-10 cm. When it is 1.5 cm or less, arc discharge is likely to occur, and ozone gas harmful to the human body may be generated at a high concentration. Even if the applied voltage is adjusted to generate ions, the ratio of the ions absorbed by the electrodes increases because the electrodes are arranged close to each other. If the distance is 10 cm or more, corona discharge is likely to occur not between the first electrode 3 and the second electrode 4 but between another object existing near the electrode and the electrode. For example, when the distance between the tip of the first electrode 3 and the tip of the second electrode 4 is 10 cm, a voltage is applied to the first electrode 3 and the second electrode 4 is grounded, it is closer to the second electrode 4. Corona discharge may occur between the existing housing 2 and the first electrode 3 and ion generation efficiency may be reduced.

  The first power supply 5 is connected to the first electrode 3, the second power supply 6 is connected to the second electrode 4, and each power supply applies a voltage to each electrode, and the first electrode 3 and the second electrode A corona discharge is generated by creating a predetermined potential difference between the four. Moreover, the 1st power supply 5 and the 2nd power supply 6 may be separately installed as shown in this embodiment, and may be comprised by one power supply. In addition, when the first electrode 3 or the second electrode 4 is in an electrically floating state or in a grounded state, the power source need not be used.

  The air blowing means 7 is constituted by a fan or the like and is disposed in the housing 2. The blowing means 7 sends ions generated by corona discharge in the direction of the discharge port 8 by blowing air taken in from an air intake port provided separately from the discharge port 8 to the air path of the housing 2. Ions are discharged from the discharge port 8 to the external space of the ion generator 1. The air blowing means 7 is preferably arranged so as to blow air between the first electrode 3 and the second electrode 4. By arranging the air blowing means 7 in such a manner, ions generated between the first electrode 3 and the second electrode 4 can be efficiently sent toward the discharge port 8. The stronger the wind power and the wind speed of the air blowing means 7, the more widely and more widely diffused ions can be diffused. However, if the wind power is strong, the operation sound of the fan increases, so it is set appropriately according to the specifications of the device. .

  Next, the voltage applied to the first electrode 3 and the second electrode 4 when generating ions will be described. Here, the reference of the voltage applied to the first electrode 3 and the second electrode 4 is set to the ground state. In the ion generator 1 of this embodiment, a corona discharge is generated by an ion generating element including the first electrode 3 and the second electrode 4 to preferentially generate either positive or negative ions. Here, the state in which positive ions are preferentially generated means that 90% or more of the ions emitted from the emission port 8 are positive ions. The same applies to negative ions.

  First, in order to generate corona discharge, a predetermined voltage difference is created between the first electrode 3 and the second electrode 4. At this time, the voltage difference between the first electrode 3 and the second electrode 4 is preferably 3 to 10 kV. When the voltage difference is 3 kV or less, corona discharge is difficult to occur and the amount of ions generated is not sufficient. Further, when the voltage difference is 10 kV or more, there is a high possibility that arc discharge will occur and there is a risk that the apparatus will break down.

  Furthermore, in order to preferentially generate either positive or negative ions, it is necessary to set the absolute value of the voltage applied to the first electrode 3 and the absolute value of the voltage applied to the second electrode 4 to be different. is there. At this time, the sum of the voltage applied to the first electrode 3 and the voltage applied to the second electrode 4 has either a positive or negative polarity. When the sum of the voltage applied to the first electrode 3 and the voltage applied to the second electrode 4 is zero or near zero, either positive or negative ions are not generated preferentially. For example, when 3 kV is applied to the first electrode 3 and −3 kV is applied to the second electrode 4, the amount of positive ions generated at the first electrode 3 is substantially equal to the amount of negative ions generated at the second electrode 4. In addition, the amount of positive ions generated by the first electrode 3 absorbed by the second electrode 4 and the amount of negative ions generated by the second electrode 4 absorbed by the first electrode 3 are substantially equal, so that positive or negative Either ion is not generated preferentially. Therefore, by setting the sum of the voltage applied to the first electrode 3 and the voltage applied to the second electrode 4 to either positive or negative polarity, the amount of positive ions generated / absorbed and the amount of negative ions generated / A difference is made in the amount of absorption, and either positive or negative ions are preferentially generated. At this time, the difference between the absolute value of the applied voltage to the first electrode 3 and the absolute value of the applied voltage to the second electrode 4 is preferably 3 kV or more.

  Next, more specific voltages applied to the first electrode 3 and the second electrode 4 will be described. For example, it is assumed that either positive or negative voltage is applied to the first electrode 3 and zero or a voltage near zero is applied to the second electrode 4. Applying a voltage at or near zero here includes grounding the electrode and electrically floating the electrode. At this time, when a voltage difference is generated between the first electrode 3 and the second electrode 4 to generate a corona discharge, and positive voltage is applied to the first electrode 3, positive ions are preferentially generated and negative voltage is generated. When applied, negative ions are preferentially generated. For example, when a positive voltage is applied to the first electrode 3 and a negative voltage is applied to the second electrode 4, the generated positive ions are absorbed by the second electrode 4. Therefore, when applying a voltage having a polarity opposite to that of the ions to be generated, it is preferable to set the voltage to near zero. In addition, since the 1st electrode 3 and the 2nd electrode 4 are arrange | positioned symmetrically, even if the applied voltage is reversed, it cannot be overemphasized that the same result is obtained.

  Further, a corona discharge may be generated by creating a potential difference that generates a corona discharge between the first electrode 3 and the second electrode 4 while applying a voltage having the same polarity to the first electrode 3 and the second electrode 4. . At this time, when a positive voltage is applied, positive ions are preferentially generated, and when a negative voltage is applied, negative ions are preferentially generated. In this way, by applying a voltage having the same polarity as the ions to be generated to both electrodes, ions generated by the repulsion effect are hardly absorbed by the electrodes. There is no limitation to the waveform of the voltage applied to the first electrode 3 or the second electrode 4, and a direct current, a pulse waveform, a sine waveform or the like can be given.

  For example, FIG. 3 is a diagram illustrating an example of a voltage waveform applied to the first electrode 3 and the second electrode 4, and FIG. 3A is a voltage waveform diagram when generating positive ions, and FIG. b) is a voltage waveform diagram when negative ions are generated. In FIG. 3, the vertical axis represents voltage, the horizontal axis represents time, V 1 represents voltage applied to the first electrode 3, and V 2 represents voltage applied to the second electrode 4. The voltage V1 is a pulse voltage driven at a cycle T1, and the voltage V2 is a zero DC voltage, which is equivalent to the ground state. By applying a pulse voltage that goes back and forth between a high voltage and zero to the first electrode 3, the corona discharge is periodically turned ON / OFF.

  In the case of FIG. 3A, a positive voltage is applied to the first electrode 3 during the period T2 in the period T1, and the voltage difference between the first electrode 3 and the second electrode 4 is set within a predetermined range. Causes corona discharge. The predetermined range here refers to a range in which corona discharge occurs between the first electrode 3 and the second electrode 4. T2 is a period during which ions are generated as a discharge period. On the other hand, during the period T1, during the period T3, a zero voltage or a voltage near zero voltage is applied to the first electrode 3, and the potential difference between the first electrode 3 and the second electrode 4 is made substantially zero, thereby corona discharge. Does not cause. The term “substantially zero” as used herein refers to a range where no corona discharge occurs between the first electrode 3 and the second electrode 4, and includes zero. T3 is a period during which no discharge occurs and ions are not generated. The period T1, the discharge period T2, and the non-discharge period T3 satisfy the relationship of T1 = T2 + T3. Further, the DUTY ratio of the discharge period T2 with respect to the cycle T1 is set to a percentage (%) of T2 / T1.

  On the other hand, in the case of FIG. 3B, the voltage waveform is the same as that of FIG. 3A except that the voltage V1 applied to the first electrode 3 has the reverse polarity of V1 of FIG. Negative ions are generated in the discharge period T2, and no ions are generated in the non-discharge period T3.

  In FIG. 3, a pulse voltage is applied to the first electrode 3 and a DC voltage is applied to the second electrode 4. However, since the first electrode 3 and the second electrode 4 have a symmetrical structure, a DC voltage is applied to the first electrode 3. Similar results can be obtained even when a pulse voltage is applied to the second electrode 4.

  Further, the voltage waveform applied to each electrode to generate ions is not limited to that shown in FIG. 3, and when generating ions, the voltage difference between the first electrode 3 and the second electrode 4 is set within a predetermined range. When the ions are not generated, the potential difference between the first electrode 3 and the second electrode 4 may be made almost zero. For example, a DC voltage may be applied to each electrode so that the voltage difference between the first electrode 3 and the second electrode 4 falls within a predetermined range. At this time, ions continue to be generated.

[Embodiment 2]
The ion generator 11 of the present embodiment includes two sets of ion generating elements including a first electrode and a second electrode, generates positive ions from one ion generating element, and generates negative ions from the other ion generating element. By generating, both positive ions and negative ions can be generated. The basic configuration of each component of the ion generator 11 and the applied voltage for generating ions is the same as that of the first embodiment.

  FIG. 4 is a cross-sectional view showing the configuration of the ion generator 11 in one embodiment of the present invention. The first electrode 3a and the second electrode 4a form an ion generating element, the first electrode 3a is connected to the first power source 5a, and the second electrode 4a is connected to the second power source 6a. In this configuration, the applied voltage from the first power source 5a and the second power source 6a is set so that positive ions are preferentially generated from the first electrode 3a and the second electrode 4a, and the first electrode 3a and the second electrode are set. Corona discharge occurs between 4a and 4a. Similarly, the first electrode 3b and the second electrode 4b form an ion generating element. The first electrode 3b is connected to the first power source 5b, and the second electrode 4b is connected to the second power source 6b. In this configuration, the applied voltage from the first power source 5b and the second power source 6b is set so that negative ions are preferentially generated from the first electrode 3b and the second electrode 4b, and the first electrode 3b and the second electrode are set. Corona discharge occurs between 4b and 4b.

  The air blowing means 7 is constituted by a fan or the like and is disposed in the housing 2. The blowing means 7 blows air taken in from an air intake provided separately from the discharge port to the air passage of the housing 2, thereby generating positive ions generated from the first electrode 3 a and the second electrode 4 a. The discharge port 8a discharges to the external space of the ion generator 11, and the negative ions generated from the first electrode 3b and the second electrode 4b are discharged from the discharge port 8b to the external space of the ion generator 11.

  By releasing positive ions and negative ions simultaneously into the air in this way, effects such as decomposition of mold and viruses floating in the air, removal of odors, and dust collection can be produced. Moreover, you may use as static elimination apparatuses, ie, an ionizer, such as a semiconductor factory, by discharging | emitting positive ion and negative ion simultaneously in the air. By generating high concentrations of positive ions and negative ions at the same time, an excellent charge removal effect can be obtained.

  Next, since an experiment was performed using the ion generator of the present invention described in Embodiment 1, the content thereof will be described below.

  In Example 1, an experiment will be described in which the relationship between the DUTY ratio in the discharge period T2 and the amount of ions generated is measured using the ion generator according to the present invention. FIG. 5 shows a specific experimental apparatus in which a measurement experiment was performed. An ion measuring device 9 is arranged at the tip of the discharge port 8 of the ion generator 1. The ion measuring device 9 is arranged at a location approximately 50 cm away from the extension line of the first electrode 3 and the second electrode 4 in the vertical direction, and the generated ions are measured by measuring the magnitude of the current flowing through the ion measuring device 9. Observe the quantity. Here, the current flowing through the ion measuring instrument 9 is defined as an ion current.

The housing 2 is made of a single layer of polycarbonate, and the first electrode 3 and the second electrode 4 are made of conductive metal, the shaft portion has a diameter of 1 mm, a length of 5 mm, and a sufficiently sharp needle shape. It was a thing. The distance between the tip of the first electrode 3 and the tip of the second electrode 4 was 45 mm. The air blowing means 7 is composed of a fan and blows air having an air volume of 1.5 m ³ / min to the air path of the housing 2. The voltage applied to the first electrode 3 is a pulse voltage as shown in FIG. 3A. Specifically, the frequency is 2 kHz, zero voltage is set in the non-discharge period T3, and two kinds of pulses are +5 kV or +9 kV in the discharge period T2. Voltage was used. The second electrode 4 was grounded without using a power source.

  In the ion generator 1 configured as described above, the ion current of the ion measuring instrument 9 was measured while changing the DUTY ratio of the pulse voltage applied to the first electrode 3 to 5 to 90%. FIG. 6A shows the experimental results showing the relationship between the DUTY ratio and the ion current. From this result, it can be seen that the ionic current increases as the DUTY ratio increases regardless of the magnitude of the pulse voltage applied to the first electrode 3. That is, it means that the generation amount of positive ions is increased. This is considered to be because the discharge period T2 becomes longer by increasing the DUTY ratio.

  Next, FIG.6 (b) is a relationship figure of the DUTY ratio calculated | required from the result of Fig.6 (a), and ion generation efficiency. The ion generation efficiency is a value obtained by dividing a value obtained by dividing the ion current of FIG. 6A by the DUTY ratio, and here, a value when the DUTY ratio is 10% is 1, and is a normalized value. Thus, the ion generation efficiency indicates an ion current per unit DUTY ratio, and the larger the ion generation efficiency, the more efficiently ions are generated. According to FIG. 6B, regardless of the magnitude of the pulse voltage applied to the first electrode 3, when the DUTY ratio is 10%, the ion generation efficiency is good, and as the DUTY ratio is increased, ion generation occurs. It turns out that efficiency falls. That is, when the DUTY ratio is increased, the generation amount of positive ions increases, but the generation efficiency decreases. On the other hand, when the DUTY ratio is 10% or less, it can also be seen that the ion generation efficiency decreases.

  When FIG. 6B is analyzed in detail, when the pulse voltage difference is 5 kV, the ion generation efficiency is 0.4 or more when the DUTY ratio is 5 to 42%, and the ion generation efficiency when the DUTY ratio is 5 to 26%. It becomes 0.6 or more and it turns out that ion generate | occur | produces efficiently. Furthermore, it can be seen that when the DUTY ratio is 7.4 to 18%, the ion generation efficiency is 0.8 or more, and ions are generated more efficiently, which is preferable. Similarly, when the pulse voltage difference is 9 kV, the ion generation efficiency is 0.4 or more when the DUTY ratio is 5.4 to 31%, and the ion generation efficiency is 0.6 or more when the DUTY ratio is 7.0 to 18%. It can be seen that ions are generated efficiently. Furthermore, it can be seen that when the DUTY ratio is 8.5 to 14%, the ion generation efficiency is 0.8 or more, and ions are generated more efficiently, which is preferable.

  From the above results, it is understood that when a pulse voltage is applied and ions are generated using the ion generator according to the present invention, ions are efficiently generated when the DUTY ratio of the pulse voltage is about 10%. It was. In addition, a low DUTY ratio means that the discharge period T2 is short, which leads to a reduction in power consumption. Therefore, ions can be generated with low power consumption. In Example 1, a positive pulse voltage was applied to generate positive ions. However, it goes without saying that the same result can be obtained even when a negative pulse voltage is applied to generate negative ions. Nor.

  In Example 2, an experiment will be described in which the relationship between the voltage V2 applied to the second electrode 4 and the amount of ions generated is measured using the ion generator according to the present invention. The experimental apparatus in which the measurement experiment was performed is the same as the experimental apparatus in FIG. 5 used in Example 1, except that the second power source 6 is connected to the second electrode 4. The configurations and arrangements of the ion generator 1 and the ion measuring instrument 9 are the same as those in the first embodiment.

  FIG. 7 is a voltage waveform diagram applied to the first electrode 3 and the second electrode 4 in Example 2, and FIG. 7A is a voltage waveform diagram when generating positive ions, and FIG. These are voltage waveform diagrams when negative ions are generated. Similar to FIG. 3, the vertical axis represents voltage, the horizontal axis represents time, V 1 represents voltage applied to the first electrode 3, and V 2 represents voltage applied to the second electrode 4. In FIG. 7A of the second embodiment, the voltage V1 applied to the first electrode 3 is a pulse voltage having a frequency of 2 kHz and a voltage of 0-9 kV, and the duty ratio of the discharge period T2 is 90%. The voltage V2 applied to the second electrode 4 was a DC voltage. Further, in FIG. 7B, the voltage applied to the first electrode 3 and the second electrode 4 is a voltage having the reverse polarity of FIG. 7A, and the voltage V1 has a frequency of 2 kHz and a voltage of -9-0 kV. The pulse voltage and voltage V2 were DC voltages.

  In the ion generator 1 configured as described above, the ion current of the ion measuring instrument 9 was measured while changing the DC voltage V2 applied to the second electrode 4 to 0 to 8 kV. FIG. 8A shows the experimental results showing the relationship between voltage V2 and ion current when positive ions are generated, and FIG. 8B shows voltage V2 and ion current when negative ions are generated. It is the experimental result which showed this relationship. FIG. 8A shows that the ionic current increases when the voltage V2 is 3 to 6 kV, and particularly increases when the voltage V2 is 4 kV. On the other hand, FIG. 8B shows that the ionic current increases when the voltage V2 is −5 to −3 kV, and particularly increases when the voltage V2 is −5 kV.

  From these results, when comparing FIGS. 8A and 8B, the same tendency is observed, and the ionic current increases when the absolute value of the DC voltage V2 applied to the second electrode 4 is 3 to 5 kV. The ionic current is decreasing before and after that. When the absolute value of the DC voltage V2 is 3 to 5 kV, the ion current increases because the voltage of the same polarity as the ions to be generated is applied to the second electrode 4 to repel the ions. The reason is that the amount of ions absorbed by 4 can be reduced. If the absolute value of the DC voltage V2 applied to the second electrode 4 is 5 kV or more, the potential difference between the first electrode 3 and the second electrode 4 during the discharge period T2 is reduced, and the amount of ions generated is reduced. Therefore, it is considered that the ionic current has decreased.

  From the above results, when a pulse voltage is applied to the first electrode 3 using the ion generator according to the present invention, a DC voltage of approximately 30 to 60% of the maximum value of the pulse voltage is applied to the second electrode 4. It was found that positive ions are generated efficiently. In Example 2, a pulse voltage was applied to the first electrode 3 and a DC voltage was applied to the second electrode 4. However, a DC voltage was applied to the first electrode 3 and a pulse voltage was applied to the second electrode 4. You may let them.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, The range of this invention is shown by a claim, and the meaning and range equivalent to a claim All changes within are intended to be included.

  Moreover, since various effects are enhanced by the generation of ions, the ion generator according to the present invention can be mounted on an air cleaning device. Air purifiers here are air conditioners, dehumidifiers, humidifiers, air purifiers, fan heaters, etc., mainly in the interior of a house, a room in a building, a hospital room, a car cabin. It is a device that is used to adjust the air in an airplane cabin, a ship cabin, and the like.

DESCRIPTION OF SYMBOLS 1,11 Ion generator 2 Case 3, 3a, 3b 1st electrode 4, 4a, 4b 2nd electrode 5, 5a, 5b 1st power supply 6, 6a, 6b 2nd power supply 7 Blower means 8, 8a, 8b Release Exit 9 Ion meter

Claims (8)

An ion generating element including a linear first electrode and a linear second electrode for generating ions by corona discharge,
The first electrode and the second electrode are configured to preferentially generate either positive or negative ions.   2. The ion generating element according to claim 1, wherein the first electrode and the second electrode are arranged to face each other so that projected areas when the other electrode is viewed from one electrode overlap each other. .   The ion generating element according to claim 1 or 2, wherein the first electrode and the second electrode have a needle-like shape at a tip. An ion generating element comprising a linear first electrode and a linear second electrode;
A first power source connected to the first electrode;
A second power source connected to the second electrode;
The difference between the absolute value of the voltage applied to the first electrode and the absolute value of the voltage applied to the second electrode is 3 kV or more, and the voltage difference between the first electrode and the second electrode An ion generator characterized by causing corona discharge.   5. The ion generator according to claim 4, wherein a positive or negative voltage is applied to one of the first electrode and the second electrode, and no voltage is applied to the other electrode.   The ion generator according to claim 4, wherein a voltage having the same polarity is applied to the first electrode and the second electrode.   The air blowing means is provided, and the air blowing means is arranged so as to send air between the first electrode and the second electrode. The ion generator as described.   A pulse voltage is applied to either the first electrode or the second electrode, and a DC voltage of 30 to 60% of the maximum value of the pulse voltage is applied to the other electrode. Item 7. The ion generator according to Item 6.