JPH03151040A - Device for producing ion - Google Patents

Abstract

PURPOSE:To limit short-circuit current and to safely and surely produce ions by providing a grounded-electorode oppositely to a discharge electrode and directly impressing voltage to a resistor fiber bundle being the discharge electrode with a high-voltage generating means. CONSTITUTION:A discharge electrode 1 is provided by fixing the end parts of a plurality of resistor fiber bundles 4 having the range within 10<3>-10<8>OMEGA.cm volume resistivity to the base part 7 of a conductor and parallel forming the resistor fiber bundles. A grounded-electrode 2 is provided oppositely to this discharge electrode 1 and also a high-voltage generating means 3 is provided which is connected to the discharge electrode 1 and directly impresses high voltage. As a result, the device is miniaturized with simplified structure. Further short-circuit current is limited and ions safely and surely are produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an ion generating device that generates air ions.

(Prior Art) Conventionally, ion generating devices that generate air ions by corona discharge are known.

In general, this type of ion generator is used as a static eliminator to remove static electricity from a charged object, as it is possible to neutralize the electric charge on a charged object with the generated air ions. , a self-discharge type static eliminator, or a voltage application type static eliminator.

As shown in FIG. 9, for example, the self-discharge type static eliminator holds a plurality of conductive fibers as discharge electrodes on a conductor a such as an aluminum material, and a conductive wire C extending from the conductor a.
It is grounded via. This self-discharge static eliminator uses the electrostatic energy of the charged body X to generate air ions, and collects the electric field from the charged body ionizes the air and generates air ions. These air ions neutralize and eliminate the charge on the charged body X.

However, since the self-discharge type static eliminator utilizes the electrostatic energy of the charged body X, the static elimination effect depends on the magnitude of the charging voltage of the charged body X. As a result, if the charging voltage of the charged body X is low, there is a problem in that no corona discharge occurs and static elimination is not performed at all.

Further, the voltage application type static eliminator E includes an electrode portion d and an AC high voltage generator e, as shown in FIGS. 1O and 11, for example. The electrode part d is provided with a rod-shaped handle part f and a large number of needle-shaped discharge electrodes g arranged in a row.
Ground electrodes facing each other with a space therebetween are supported and provided at both ends of the handle f.

The voltage application type static eliminator E includes the AC high voltage generator e.
By applying an alternating current voltage to the discharge electrode g via the conductor i, corona discharge occurs relatively stably between the discharge electrode g and the ground electrode. This corona discharge ionizes the air, and these air ions neutralize and eliminate the charge on the charged body X. Therefore, the voltage application type static eliminator E can obtain a more efficient static eliminator effect than the self-discharge type static eliminator.

In addition, in the voltage application type static eliminator E, in order to generate air ions necessary to reliably eliminate static electricity from the charged body X, it is necessary to actively perform corona discharge. Therefore, in the static eliminator E, a voltage of 6 kV to 9 kV is applied to the discharge electrode g.
A high voltage of V is applied.

However, if such a high voltage is directly applied to the discharge electrode g, there is a risk of overcurrent and burnout due to short circuiting, or electric shock due to contact with the human body.

Therefore, as shown in FIG. 11, in the electrode section d, the discharge electrode g is connected to a cylindrical current collector tube j, and a rod-shaped conductive core is inserted into the current collector tube j via an insulator k. ! is provided to form a capacitor structure, and its outer periphery is insulated by an insulating outer cylinder m. As a result, the conductor i from the AC high voltage generator e is connected to the conductive core 2, and a high voltage is applied to the discharge electrode g via a capacitor, thereby limiting short circuit current and preventing overcurrent and electric shock. is prevented.

However, as described above, the electrode portion d has a capacitor structure, so its structure is complicated. Therefore, even if sufficient voltage resistance design is carried out, the insulator k deteriorates due to long-term use, resulting in insulation failure, and the short-circuit current cannot be restricted. Furthermore, the electrode part d has a complicated structure as described above, and it is necessary to ensure a sufficient capacitance of the capacitor, so there is a problem that the electrode part d becomes large.

Although not shown, in the voltage application type static eliminator, in order to limit short-circuit current and prevent overcurrent and electric shock, a corona discharge is performed between the discharge electrode g and the AC high voltage generator e. It is conceivable to incorporate a resistor circuit that limits the current required for within a predetermined required amount. However, there are disadvantages in that not only the structure of the device becomes complicated but also the device becomes larger.

(Problems to be Solved by the Invention) By solving the above-mentioned disadvantages, the present invention provides an ion generator that has a simple structure, can be miniaturized, and can generate ions safely and reliably by limiting short-circuit current. The purpose is to provide equipment.

(Means for Solving the Problem) In order to achieve the above object, a first aspect of the present invention provides a plurality of resistor fiber bundles having a volume resistivity within the range of 10 3 to 10 8 Ω·cm at the base of the conductor. A discharge electrode is provided with one end fixed and formed in parallel, a ground electrode is provided opposite to the discharge electrode, and a high voltage generating means is provided which is connected to the discharge electrode and directly applies a high voltage. It is characterized by being

Further, in the first aspect, the discharge electrode, the ground electrode, and the high voltage generating means may be integrally connected.

Further, in a second aspect of the present invention, a plurality of resistor fiber bundles having a volume resistivity within a range of 108 to 108 Ω·cm are formed in parallel at one end of the base of the conductor. The present invention is characterized in that a discharge electrode is provided, and a high voltage generating means is provided which is connected to the discharge electrode and directly applies a high voltage.

Furthermore, in the second aspect, the discharge electrode and the high voltage generating means may be integrally provided in series.

(Function) By the means described above, when generating ions according to the first aspect of the present invention, when a voltage is directly applied to the resistor fiber bundle which is the discharge electrode by the high voltage generating means, the ground electrode is Therefore, corona discharge occurs between the discharge electrode and the ground electrode even if the applied voltage is relatively small. Therefore, air ions are generated with a relatively small voltage.

The resistor fiber bundle has a volume resistivity of 103 to 108Ω.
・Since it is within the range of cm, the short circuit current is limited without hindering the occurrence of corona discharge.

As mentioned above, since the voltage to be applied can be relatively small, the high voltage generating means can be small-scale, which makes it possible to downsize the device.Furthermore, the entire device can be configured in one piece. becomes possible.

Further, the device according to the second aspect of the present invention is configured by removing only the ground electrode from the device according to the first aspect.

When generating ions according to the second aspect, similarly to when generating ions according to the first aspect, the resistor fiber bundle has a volume resistivity within the range of 10 3 to 10 Ω cm. , limiting the short circuit current without preventing the occurrence of corona discharge.

Furthermore, in the second embodiment, a corona discharge is generated between the discharge electrode and the charged body, and since a ground electrode is not provided, a somewhat higher applied voltage is required than in the first embodiment. However, corona discharge occurs between the discharge electrode and the charged body even if the applied voltage is lower than that of the conventional method. Therefore,
Air ions are generated with a relatively small voltage.

Also in the second aspect of the present invention, the high voltage generating means may be small-scale, which makes it possible to downsize the device, and furthermore, it becomes possible to configure the entire device in an integrated manner.

(Example) An embodiment of the present invention will be described based on the drawings.

In this embodiment, the ion generator of the present invention is used to eliminate static electricity from a charged body.

In FIG. 1, 1 is a discharge electrode, 2 is a ground electrode opposite to the discharge electrode, and 3 is a high voltage generating means for applying a voltage to the discharge electrode.

As shown in FIG. 2, the discharge electrode 1 is made by bundling a plurality of resistor fiber bundles 4 in small quantities, and fixing one end of each bundle to an aluminum base 5 with a double-sided adhesive tape 6 at intervals. has been done. As shown in FIG. 3, the base 5 is fixed to an insulating frame 7 having a substantially N-shaped cross section, and is embedded with an insulating adhesive 8.

Specifically, the resistor fiber bundle 4 has an strand diameter of 15 μm and a filament count of 500. Fiber bundle volume resistivity 3X10'Ω・
cm of silicon carbide fiber bundle, and 7.5 m of silicon carbide fiber bundle was used at the base 5.
It is fixed at +++ intervals. In addition, the external dimensions of the fiber bundle 4 are 1.8ma+Xo, 071am in cross section,
The length was 10 mm. Further, although the double-sided adhesive tape 6 used is conductive in this embodiment, it may be insulating.

As shown in FIGS. 1 and 2, the resistor fiber bundle 4 is connected to a conductive wire 9 extending from the small-sized high voltage generating means 3 via the base 5. Such a connection state is a structure in which the voltage generated from the high voltage generating means 3 is directly applied to the resistor fiber bundle 4.

The high voltage generating means 3, as shown in FIG. 1, is a transformer that transforms the alternating current voltage from the power line 10.

Further, the high voltage generating means 3 is grounded by a grounding wire 11.

As shown in FIG. 2, the ground electrode 2 is supported by insulating support portions 12 connected to both ends of the frame 7 so as to face the discharge electrode 1. Moreover, the ground electrode 2 is
A grounding cotton 13 is connected to the edge of the blade so that it is in a grounded state.

The charged body X is neutralized by the ion generator A having the above configuration.

Next, in order to clarify the ion generation ability of the ion generation device A of this example, the static elimination effect will be investigated.

A basic method for testing the static elimination effect is to measure the effective static elimination current.

The measurement of this effective neutralization current is carried out by positioning the discharge electrode 1 with a gap W of 5 cm on the simulated charged body 15 to which a high voltage is applied by the DC high voltage power supply 14, as schematically shown in FIG. , a high voltage is applied to the discharge electrode l by the high voltage generating means 3. An ammeter (microammeter) 16 displays the current generated between the discharge electrode 1 and the simulated charged body 15 at this time, and the absolute value displayed by the ammeter 16 is the effective neutralization current. The set voltage applied to the simulated charged body 15 is displayed on a voltmeter 17 connected to the DC high voltage power supply 14.

The diagram shown in FIG. 5 shows the effective static elimination current per unit length lO cylinder and the voltage applied to the discharge electrode 1, when the set voltage applied to the simulated charged body 15 is set to -5 and ν. represents a relationship. Furthermore, in order to compare the performance of the present implementation device A with other devices, the effective static elimination current of the conventional voltage application type static elimination device E is also shown.

As shown here, the corona discharge of the conventional voltage application type static eliminator E starts when the voltage applied to the discharge electrode 1 is 2 kV, and the effective static neutralization current at the rated voltage of 6.5 kV is 0.1
It is 35μ8.

On the other hand, corona discharge in the present embodiment device A starts when the voltage applied to the discharge electrode 1 is 1 kV, and the voltage applied to the discharge electrode when the effective static elimination current reaches 0.135μ is about 3 kV. .

That is, this embodiment device A applies approximately half the voltage of the conventional voltage application type static eliminator E to the discharge electrode 1 to obtain a sufficient static neutralization effect.

Therefore, the high voltage generating means 3 of this embodiment may have a lower discharge starting voltage than the high voltage generating device e of the conventional voltage application type static eliminator E, so that it can be small-sized and miniaturized.

Next, in the present invention, the following experiment was conducted in order to determine the properties of the resistor fiber bundle 4 that do not reduce the static elimination effect described above.

The diagram shown in FIG. 6 shows that the voltage applied to the discharge electrode 1 is 3k.
It represents the change in effective static elimination current per unit length of 10 mm when the electrical resistance value of the discharge electrode 1 is changed as V.

As shown here, the resistance value of the discharge electrode 1 is 108Ω.
Above this value, corona discharge will be weakened, and below 1010Ω, the static elimination effect will be good, but the short circuit current will become large. Furthermore, in order to avoid the effects of angry electricity on the human body, in general, 1.
．． It is a well-established theory that the current is 2 mA or less. From this, the safe resistance value of the discharge electrode 1 is 2.5 x 10hΩ, 6.5k when the voltage applied to the discharge electrode 1 is 3 to ν.
When V(7), the limit is about 5.4 x 10'Ω.

That is, a resistor fiber bundle having an electrical resistance value within the range of 10 6 to 10 II Ω can be used as the discharge electrode 1 of the present embodiment device A. Here, the resistor fiber bundle 4 forming the discharge electrode 1 of the present embodiment device A described above has an external dimension of 1.8
Since the size is mm
cm. From the above, a resistor fiber bundle that has a good static elimination effect and can sufficiently limit short-circuit current when used as the discharge electrode 1 has a volume resistivity of approximately 10'Ω.
It is clear that it is preferable to have a resistance between 0.5 cm and about 10' Ω·cm.

Therefore, the present invention has a volume resistivity of 10' to 108 Ω·c.
It can be confirmed that reliable and safe ion generation is possible by using a resistor fiber bundle within the range of m as a discharge electrode. In this embodiment device A, silicon carbide fibers are used as the material for the resistor fiber bundle 4, but the material is not limited to silicon carbide fibers. Body fibers or the like may be used as the material.

Furthermore, as described above, the high voltage generating means 3 in this embodiment may be small-scale and can be formed compactly, so as another embodiment, as shown in FIG. The illustrated discharge electrode 1, ground electrode 2, and high voltage generating means 3 may all be integrally connected and formed. This eliminates the trouble of separately installing the discharge electrode 1 and the high voltage generating means 3.

Further, as another example, as shown in FIG. 8, an ion generating apparatus C can be considered, which has the same structure as the above-mentioned implementation apparatus A except for the ground electrode 2.

The implementation device C requires a somewhat higher applied voltage than the implementation device A because it does not include the ground electrode 2.
Similar to the implementation device A, the volume resistivity is 103 to 108.
By using the resistor fiber bundle 4 within the range of Ω·cm as the discharge electrode l, ions can be generated reliably and safely. Furthermore, although not shown, the entire implementation device may be constructed in one piece as in FIG. 7.

Further, the voltage applied to the discharge electrode in each of the above embodiments may be either alternating current or direct current.

(Effects of the Invention) As is clear from the above, the ion generating device of the present invention applies a voltage directly to the resistor fiber bundle that is the discharge electrode by the high voltage generating means, so the applied voltage is Corona discharge occurs even if the target is small. Therefore, air ions can be generated with a relatively small voltage.

The resistor fiber bundle has a volume resistivity of 103~
Since it is within the range of 1011Ω·cm, it is possible to generate a good corona discharge and limit the short circuit current. Furthermore, the high voltage generating means can be miniaturized and the entire device can be integrated.

Therefore, according to the present invention, it is possible to provide an ion generating device that has a simple structure, can be downsized, and can generate ions safely and reliably.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a part of Fig. 1, Fig. 3 is a sectional view taken along the line ■■ in Fig. 1, and Fig. 4 is an effective static elimination current. Figure 5 is a diagram showing the relationship between effective static elimination current and applied voltage, Figure 6 is a diagram showing the relationship between effective static elimination current and electrical resistance value, and Figure 7 is a diagram showing the relationship between effective static elimination current and electrical resistance value. FIG. 8 is a partially sectional side view showing another embodiment, FIG. 9 is a side view showing a conventional static eliminator, and FIG. 10 is a side view showing a conventional static eliminator. Figure, 11th
The figure is a sectional view taken along the line XI-XI of FIG. 1O. 1... Discharge electrode 2... Ground electrode 3... High voltage generating means 4... Resistor fiber bundle 7... Base A, B, C... Ion generator applied voltage (kVAC,) Electrical resistance (Ω) FIG, 4

Claims (1)

[Claims] 1. The base of the conductor has a volume resistivity of 10^3 to 10^8.
A discharge electrode is provided, which is formed by fixing one end of a plurality of resistor fiber bundles within the range of Ω cm and forming them in parallel, and a ground electrode is provided opposite to the discharge electrode and connected to the discharge electrode. An ion generating device characterized in that it is provided with a high voltage generating means for directly applying a high voltage to the ion generator. 2. The ion generating device according to claim 1, wherein the discharge electrode, the ground electrode, and the high voltage generation means are integrally connected. 3. The base of the conductor has a volume resistivity of 10^3 to 10^8
A high voltage generating means that includes a discharge electrode formed by fixing one end of a plurality of resistor fiber bundles in the range of Ω cm and forming them in parallel, and connecting the discharge electrode to directly apply a high voltage. An ion generating device characterized by being provided with. 4. The ion generating device according to claim 3, wherein the discharge electrode and the high voltage generating means are integrally connected.