TWI477012B - Ion generator - Google Patents

Description

Ion generator

The present invention relates to an ion generator that sprays air ions generated by ionizing air by corona discharge via a conduit on a member from which static electricity is to be removed.

In order to use a charging body electrostatically charged as a member for removing static electricity, an ion has been utilized by spraying air ions to a member to be electrostatically removed to remove static electricity from the member to be electrostatically removed. A generator, such as a free agent or an electrostatic removal device. Ion generators on production lines for the manufacture and assembly of electronic components have been used to remove static electricity charged on such components from which static electricity is to be removed, such as electronic components and manufacturing-assembly-racks. Spraying the air ions to the members to be electrostatically removed prevents external substances from being electrostatically adhered to the electronic parts and the like, and prevents the electronic parts from being damaged or adhered to the frames by the static electricity.

An ion generator for these applications, as disclosed in Patent Documents 1 to 3 (Japanese Patent Laid-Open Publication Nos. 2000-138090, 2004-228069, and 2006-40860), by which a method of ionizing air: supplied from the outside Air to the needle-shaped discharge electrode; applying a high frequency and high voltage across a discharge electrode and an opposite electrode in its supply state; and generating the corona discharge around the discharge electrode.

Patent Documents 2 and 3 disclose an ion generator for directly directing the ionized air ions to the member to be electrostatically removed, in order to guide the ionized air ions to the member to be electrostatically removed. member. The ion generator disclosed in Patent Document 2 allows the discharge electrode to be disposed in the nozzle by retracting the discharge electrode from the tip end of the nozzle. Patent Document 3 discloses that the ion generator is disposed such that the discharge electrode protrudes from the tip end of the nozzle. Meanwhile, in the ion generator disclosed in Patent Document 1, the air ions are guided via the conduit to the member away from the ion generator to remove static electricity.

As disclosed in Patent Documents 2 and 3, when the air ions are ejected from the nozzle constituting the opposite electrode, the member is sprayed to the member to be electrostatically removed, and a discharge electrode is added thereto. Air ions can be sprayed onto the member from which the static electricity is to be removed before the air ions are neutralized. Conversely, as disclosed in Patent Document 1, if the air ions are guided to the member to be electrostatically removed by the conduit attached to the nozzle, the air ions will reach the static electricity to be removed. The member was previously neutralized, whereby the problem was that the electrostatic removal effect could not be fully achieved.

It is an object of the present invention to enhance the electrostatic removal effect even if the air ions are directed by the conduit to the member from which the static electricity is to be removed.

An ion generator according to the present invention having a discharge electrode and an opposite electrode provided opposite to the discharge electrode and applying an alternating high voltage across the discharge electrode and the opposite electrode to cause a generation Corona discharge, thereby generating air ions, comprising: a discharge unit including the discharge and the opposite electrode, forming an ion generating flow path in the discharge unit; and an air supply unit disposed at the discharge unit a base end portion having an air supply port connected to the ion generating flow path and supplying compressed air to the ion generating flow path, wherein an air inlet is introduced into the outside air from the outside to form the discharge a tip end portion of the unit, and a ejector, provided at a downstream side of the air inlet at the tip end portion of the discharge unit, the external air being introduced from the air inlet into the flow path through which the ion has been generated In the air ion.

In the ion generator according to the present invention, the discharge electrode is concentrically disposed at the center of the ion generating flow path. In the ion generator according to the present invention, the discharge electrode is disposed in a direction across the ion generating flow path. In the ion generator according to the present invention, the base end portion of the discharge unit has a suction port through which the air supplied from the air supply flow path is sucked, the outside air is sucked in, and the supply thereof External air to the ion creates a flow path. In the ion generator according to the present invention, the tip end portion of the discharge unit has an auxiliary air inlet that supplies the outside air to the obtained air after the air flowing in from the air inlet has been added to the air ions. Air ion. In the ion generator according to the present invention, an inner diameter of an air discharge port of the discharge unit is larger than an inner diameter of the ion generation flow path. In the ion generator according to the present invention, there is a duct provided at the tip end portion of the discharge unit, and the air ions discharged from the discharge unit are guided to a member for removing static electricity.

According to the present invention, the air ions are generated by being supplied to the ion generating flow path and ionized by the corona discharge generated around the discharge electrode, and the outside air from the air inlet is used by The ejector is introduced to the air ions to obtain a squirt effect. Therefore, the air from the air inlet is added to the air ions without increasing the amount of compressed air supplied to the ion generating flow path by the air inlet, and the combination of the air and the air ions can be Supply to the catheter. Therefore, a large amount of air ions from the duct can be supplied to the member to which static electricity is to be removed, and static electricity charged on the member to which static electricity is to be removed can be quickly removed (discharged). Furthermore, since external air which may contain foreign matter is not sprayed to a tip end of the discharge electrode, a decrease in ion balance due to foreign matter is not generated, and the ion balance can be enhanced, thereby ensuring removal This static electricity (discharge).

Examples of the invention will be described below based on the drawings. The ion generator 10a shown in Fig. 1 has a discharge unit 11, and an air supply unit 12 which is disposed at a base end of the discharge unit and is made of an insulator. The discharge unit 11 includes a cylindrical opposite electrode 13 made of a conductive material, and a cylindrical insulating member 14 mounted inside the opposite electrode. The ion generating flow path 15 is formed inside the insulating member 14. A columnar discharge needle made of a conductive material, i.e., the discharge electrode 16, is disposed within the ion generating flow path 15 to be located at a central portion thereof. A pedestal end of the discharge electrode 16 is attached to the air supply unit 12, and a tip end portion of the discharge electrode 16 protrudes from the air supply unit 12 into the ion generating flow path 15 to be co-located with the center of the ion generating flow path Center of the circle. Therefore, the discharge electrode 16 of the discharge cell 11 is disposed within the ion generation flow path 15 with respect to the discharge electrode.

The discharge electrode 16 and the opposite electrode 13 are connected to the power supply unit 17, and an alternating current high voltage from the power supply unit 17 is applied across the discharge electrode 16 and the opposite electrode 13. For example, a voltage of 6 KV from the power supply unit 17 and an AC voltage of 70 KHz are applied across the two electrodes. Therefore, a non-uniform electric field is generated around the upper portion of the tip of one of the discharge electrodes 16, and corona discharge occurs at the upper portion thereof. When the positive polarity of the high voltage is applied to the discharge electrode 16, since the discharge electrode 16 absorbs electrons of the air close to the discharge electrode, the air close thereto becomes an ion having a positive charge. Conversely, when the negative polarity of the high voltage is applied to the discharge electrode 16, since the electrons are emitted from the discharge electrode 16, the air close thereto becomes an ion having a negative polarity.

A supply port 21 is formed in the air supply unit 12, which is connected to a supply line A which supplies air from a compressed air pressure source 20. The supply port 21 is connected to a plurality of air supply ports 22 whose openings are directed toward the ion generation flow path 15 and formed in the air supply unit 12. As shown by the arrow A in the figure, the air from the compressed air pressure source 20 and supplied by the air supply port 22 into the ion generating flow path 15 is ionized by the corona discharge flowing in the ion generating flow path 15. Become an air ion.

The tip end portion of one of the discharge cells 11 made of, for example, a resin insulating material or metal is used as a nozzle 23 which is discharged from an air discharge port 19 at the tip end portion of one of the nozzles 23. A conduit 24 for guiding the air ions toward a member for removing static electricity is mounted on the tip end portion of the nozzle 23. The conduit 24 is formed of an insulating tube made of a resin such as vinyl chloride and having elasticity. Its inner diameter D is approximately 8 mm and its length L is approximately 100 to 500 mm or more.

If it is assumed that the ion generating flow path 15 formed by the insulating member 14 and the opposite electrode 13 has the inner diameter d, the air discharge port 19 of the nozzle 23 and the inner diameter D of the duct 24 are set larger than the inner diameter of the ion generating flow path 15. . The nozzle 23 includes a constricted portion 25 having an inner diameter equal to or larger than the inner diameter d of the ion generating flow path 15, and a tapered surface 26 whose inner diameter gradually increases toward an inner surface of the duct 24 and is formed at the contraction portion 25. On the tip side. A plurality of air inlets 27 are formed in the nozzles 23 for supplying external air as indicated by an arrow B in the figure, for generating the air ions generated by the ion generating flow paths 15. Formed on the nozzle 23 is a curved surface 28 for guiding the air introduced from the air inlet 27 toward the constricted portion 25. The constricted portion 25, the tapered surface 26, and the curved surface 28 form a ejector 29 that directs the outside air from the air inlet 27 by the air ions that generate the flow path 15 through the ions and flow inside the nozzle 23.

The tapered surface 26 formed on the nozzle 23 has a diffuser function, and external air from the air inlet 27 is introduced into the conduit 24 via the air discharge port 19 of the nozzle 23. Therefore, the outside air introduced from the air inlet 27 is added to the air which has been supplied into the ion generating flow path 15 by the air supply port 22 and which has been ionized, and the combination of the ionized air and the outside air It is supplied to the catheter 24. Therefore, since the ejector 29 is provided on the nozzle 23, even if the flow rate of the compressed air supplied to the supply port 21 is lowered, the amount of air ions sprayed from the tip end of the pipe 24 to the member to be electrostatically removed is not reduced. And can reduce the neutralization due to the collision with positive ions. Therefore, static electricity that has been charged on the member to be electrostatically removed can be removed in a short time.

The base end portion of the discharge unit 11 has a plurality of suction ports 31 which are supplied from the outside via the air supply port 22 as indicated by an arrow C, as the air is ejected toward the ion generation flow path 15. Therefore, without increasing the flow rate of the air supplied to the ion generation path 15 by the air supply port 22, air supplied from the outside via the suction port 31 is added to the air ions, whereby a large amount of air can be supplied to the ion generation In the flow path 15. Therefore, since the air from the suction port 31 is added to the air ions together with the compressed air supplied to the supply port 21, even if the flow rate of the compressed air to be supplied to the supply port 21 is lowered, foreign substances such as fine particles, A tip that is adhered to the discharge electrode 16 can be avoided. In particular, the air ejected from the air supply port 22 flows in the central portion of the ion generating flow path 15 to cover the discharge electrode 16, and the external air supplied from the suction port 31 is mainly along the outer side of the ion generating flow path 15. The rim flows so that if clean air from the air supply port 22 is ejected, even when the fine particles are contained in the air supplied from the outside through the suction port 31, the foreign substances can ensure adhesion to the discharge electrode 16, and Improves the balance in the ions.

Since the air introduced from the air inlet 27 by the ejector 29 is collected and passed through a downstream side of the discharge electrode 16, the outside air from the air inlet 27 is introduced to the air ions that have been ionized by the discharge electrode 16. Therefore, the ion balance in the air ions ejected by the conduit 24 can be enhanced, so that the effect of removing static electricity can be enhanced.

2 through 4 show cross-sectional views of ion generators respectively according to other examples of the present invention. In FIGS. 2 to 4, the same reference numerals denote the same components as those shown in FIG. 1.

In the ion generator shown in Fig. 1, the conduit 24 is directly mounted on the nozzle 23. In contrast, in the ion generator 10b shown in Fig. 2, the duct 24 is mounted on the nozzle 23 by the joint 30. The other structure is similar to that of the ion generator 10a shown in FIG.

In the ion generator 10c shown in Fig. 3, the nozzle 23 has a nozzle body portion 23a to which a duct 24 is attached, and a nozzle support portion 23b to which the nozzle body portion 23a is attached and which is mounted on the discharge unit 11. Formed in the nozzle support portion 23b are a plurality of air inlets 27 for introducing air from the outside, as indicated by an arrow B with respect to the air ions generated via the ion generating flow path 15. Further formed in the nozzle support portion 23b is a curved surface 28 that guides the air introduced from the air inlet 27 toward the nozzle main body portion 23a. Formed as a ejector 29, the outside air is introduced from the air inlet 27 by the curved surface 28 and the air ions flowing through the ion generating flow path 15 and flowing inside the nozzle supporting portion 23b.

Further, formed in the nozzle support portion 23b of the nozzle 23 is an auxiliary air inlet 32 for introducing air from the outside with respect to the mixed air ions as indicated by the arrow D (where the air flowing in from the air inlet 27 has been added to These air ions are inside). The auxiliary air inlet 32 communicates with one of the base end faces of the nozzle body portion 23a of the nozzle 23. The inner diameter of the constricted portion 25 substantially corresponds to the inner diameter d of the ion generating flow path 15, which is formed in the nozzle main body portion 23a, and the tapered surface 26 whose inner diameter gradually increases toward the inner surface of the duct 24, which is formed at From the tip end side of the constricted portion 25. Formed on the nozzle body portion 23a is a curved surface 33 that guides air introduced from the auxiliary air inlet 32 toward the constricted portion 25. Formed by the constricted portion 25, the tapered surface 26, and the curved surface 33 is an auxiliary ejector 34 for introducing external air from the auxiliary air inlet 32 using the air ions flowing inside the nozzle main body portion 23a.

With this configuration, the external air is introduced as a first stage by the ejector 29, and the auxiliary ejector 34 is a second stage with respect to the air ions which flow through the ions and flow inside the nozzle 23. . Therefore, even if the amount of compressed air supplied to the supply port 21 is lowered, a large amount of air ions can be sprayed onto the member to which static electricity is to be removed.

4 is a cross-sectional view showing an ion generator 10d according to another example of the present invention. In the ion generators 10a to 10c described above, the columnar discharge electrodes 16 may be disposed to extend concentrically toward a radial central portion of the ion generating flow path 15. Conversely, in the ion generator 10d shown in FIG. 4, the discharge electrode 16 is radially disposed and in the direction in which the flow path 15 is generated across the ions. In the discharge cell 11 of the ion generator 10d, the discharge electrode 16 is attached to the cylindrical insulating member 14, in which an ion generating flow path 15 is formed which is made of a resin material, and the tip end portion of the discharge electrode 16 is placed in the ion generating flow. A centerline of path 15. The opposite electrode 13 is attached to the insulating member 14 with respect to the discharge electrode 16.

Similar to the ion generator 10a shown in Fig. 1, the tip end portion of the discharge cell 11 made of, for example, a resin insulating material or metal is used as the nozzle 23, and is used to guide the air ions toward the front. A conduit 24 of this member that removes static electricity is intended to be mounted on the tip end portion of the nozzle 23. A constricted portion 25 and a tapered surface 26 are formed in the nozzle 23, the inner diameter of which gradually increases toward the inner surface of the duct 24, and is located on the tip end side from the constricted portion 25, and forms a plurality of air inlets 27 for self- Air is introduced to the outside as shown by arrow B with respect to the air ions generated via the ion generating flow path 15. Similar to the ion generator 10a shown in FIG. 1, a nozzle 28 is formed on the nozzle 23 for guiding the air introduced from the air inlet 27 toward the constriction 25. Formed as a ejector 29 for introducing the outside air from the air inlet 27 by the constriction 25, the tapered portion 26, the curved surface 28, and the air ions flowing through the ion generating flow path 15 and flowing inside the nozzle 23 .

Meanwhile, in the ion generators 10c and 10d shown in FIGS. 3 and 4, even if the amount of compressed air to be supplied to the supply port 21 is lowered, when the positive and negative ions are prevented from being neutralized, the self-conducting pipe 24 is The amount of air ions sprayed onto the member to which static electricity is to be removed is not reduced as a result, and static electricity on the member to be electrostatically removed can be removed in a short time. Further, since the air inlet 27 is formed on the downstream side of the discharge electrode 16, the outside air from the air inlet 27 is introduced into the air ions which have been ionized by the discharge electrode 16. Therefore, the ion balance of the air ions ejected by the duct 24 can be enhanced, and the effect of removing static electricity can be enhanced.

5 and 6 show ion generators as comparative examples, respectively. In the ion generator 10e shown in Fig. 5, the arrangement form of the discharge electrodes 16 is similar to that of each of the ion generators 10a to 10c shown in Figs. An air supply unit 12 in which an air supply port 22 communicating with the supply port 21 is formed, which has a cylindrical insulating member 14 in which an ion generating flow path 15 is formed, and the discharge electrode 16 is attached to the air supply unit 12, thereby protruding to The ions are generated in the flow path 15. The opposite electrode 13 to which the duct 24 is mounted is mounted on the insulating member 14, and the counter electrode 13 serves as a nozzle. Therefore, the ion generator 10d as a comparative example does not have the ejector 29.

Meanwhile, the ion generator 10f shown in FIG. 6 is similar to the ion generator 10d, and the arrangement form of the discharge electrode 16 is as shown in FIG. The discharge electrode 16 and the opposite electrode 13 are supplied to a nozzle 23 connected to the air supply unit 12 via a spacer 35 in which an air supply port 22 communicating with the supply port 21 is formed, and the discharge unit is formed by the nozzle 23. On the upstream side of one of the ion generating flow paths 15 formed on the tip end side of the nozzle 23, a curved surface 28 and a tapered surface 26 for guiding the air introduced from the air inlet 27 are formed. The ejector 29 is formed by a curved surface 28 and a tapered surface 26 for introducing external air from the air inlet 27 to the air supplied to the nozzle 23 from the air supply port 22 and the suction port 31. Therefore, in the ion generator 10f which is a comparative example, the air is ionized on the downstream side of the ejector 29 by the discharge electrode 16 and the opposite electrode 13.

Fig. 7A is a characteristic graph showing the comparison of the respective electrostatic removal effects of the ion generator 10a shown in Fig. 1 and the ion generator 10e shown as a comparative example in Fig. 5. Fig. 7B is a characteristic graph showing the comparison of the respective electrostatic removal effects of the ion generator 10c shown in Fig. 3 and the ion generator 10e as a comparative example. In each of FIGS. 7A and 7B, the vertical axis represents an electrostatic removal time, and the horizontal axis represents the flow rate of the air supplied from the supply port 21.

When measuring the respective characteristic curves, a catheter 24 having a length of 500 mm was used, and the static electricity removal time was measured by setting a charging plate monitor of 50 mm from the tip end portion of the catheter 24. Therefore, as shown in Fig. 7A, since the ion generators 10a and 10c of the present invention shown in Figs. 1 and 3 have the ejector 29, their electrostatic removal time is shorter than those of the comparative examples. . In particular, when the flow rate of the compressed air supplied from the supply port 21 is lowered, the effect of shortening the static electricity removal time by the ion generator of the present invention will be more remarkable than the effects of the comparative examples. Meanwhile, as shown in FIG. 7B, if the auxiliary air is supplied from the auxiliary air inlet 32, it is similar to the configuration of the ion generator 10c, and even when the flow rate of the compressed air supplied from the supply port 21 is high, the static electricity removal is shortened. The effect of time will be more significant. Note that the ion generator 10b shown in Fig. 2 can also obtain an effect similar to that of the ion generator 10a.

Meanwhile, FIG. 8A is data representing the result of the confirmation test of the disturbance in the measured ion balance of the ion generator 10d of the present invention shown in FIG. 4 by forcibly injecting fine particles into the ion generating flow path 15. Fig. 8B is a view showing the results of the similar confirmation test of the ion generator 10f of the comparative example shown in Fig. 6.

The respective tests were carried out under conditions using an ion generator having a conduit 24 of length 100 mm mounted on the nozzle 23, and compressed air having a pressure of 0.1 MPa was supplied from the supply port 21 to the ions. A flow path 15 is created. The fine particles are forcibly injected from the air inlet 27 based on the ion generator being used where the ambient air is not appropriate. Therefore, in the ion generator 10f which is a comparative example, the disturbance in the ion balance occurs after the injection of the foreign matter for ten seconds. However, in the ion generator 10d of the present invention, disturbance in ion balance does not occur. Therefore, even when the ion generator of the present invention is used at a position where the ambient air is inappropriate, the ion balance can be enhanced by introducing external air from the air inlet 27 on the downstream side of the discharge electrode 16.

Fig. 9 is a graph showing a comparison of the ion balance effect of the ion generator 10d of the present invention shown in Fig. 4 and the ion generator 10f of the comparative example shown in Fig. 6. The vertical axis in Figure 9 represents the ion balance, and the horizontal axis therein represents the air supply pressure. Fig. 9A shows the measurement results obtained by using the catheter 24 having a length of 100 mm, and Fig. 9B shows the measurement results obtained using the catheter 24 having a length of 500 mm. As a result, in the ion generator 10d of the present invention shown in Fig. 4, even when the air supply pressure is changed, the ion balance does not largely change; and in the ion generator 10f which is a comparative example, When the air supply pressure changes, the ion balance also changes greatly. As shown in these comparative examples, the large change in the plasma balance is attributed to the air disturbance caused by the structure of the ejector because the air is ionized after the outside air is introduced on the downstream side of the ejector 29. The reason.

Therefore, the results show that if the ejector 29 introduces the outside air using the flow of the air ions obtained after ionization of the air, as in the present invention, the air ions having a good ion balance can be sprayed to be removed. Electrostatically on the member, thereby enhancing the electrostatic removal effect.

In each of the ion generator 10g shown in FIG. 10 and the ion generator 10h shown in FIG. 11, none of the aforementioned conduits 24 are attached to the nozzle 23. The ion generator 10g shown in Fig. 10 has the same basic structure as the ion generator 10a shown in Fig. 1, and the ion generator 10h shown in Fig. 11 has the ion generator shown in Fig. 3. 10c the same basic structure. In the ion generators 10g and 10h described above, the air ions are ejected from the air discharge port 19 onto the member to which static electricity is to be removed.

The present invention is not limited to the above examples, and various modifications can be made without departing from the spirit and scope of the invention. For example, in each of the discharge cells 11 shown in FIGS. 1 to 3, the discharge electrode 16 and the opposite electrode 13 are opposed to each other by interposing the insulating member 14 therebetween, but the two electrodes may directly face each other.

10a, 10b, 10c, 10d, 10e, 10f‧‧‧ ion generator

11‧‧‧Discharge unit

12‧‧‧Air supply unit

13‧‧‧Cylindrical opposite electrode

14‧‧‧Cylindrical insulation members

15‧‧‧Ion generating flow path

16‧‧‧Discharge electrode

17‧‧‧Power supply unit

19‧‧‧Air discharge埠

20‧‧‧Compressed air pressure source

21‧‧‧Supply

22‧‧‧Air supply埠

23‧‧‧Nozzles

23a‧‧‧Nozzle body

23b‧‧‧Nozzle support

24‧‧‧ catheter

25‧‧‧Contraction

26‧‧‧Conical surface

27‧‧‧Air inlet

28‧‧‧ curved surface

29‧‧‧Spurter

30‧‧‧Connectors

31‧‧‧Inhalation test

32‧‧‧Auxiliary air inlet

33‧‧‧ curved surface

34‧‧‧Assisted ejector

35‧‧‧ spacer

A‧‧‧Supply line

1 is a cross-sectional view showing an ion generator according to an example of the present invention; FIG. 2 is a cross-sectional view showing an ion generator according to another example of the present invention; and FIG. 3 is a view showing still another example according to the present invention. FIG. 4 is a cross-sectional view showing an ion generator according to still another example of the present invention; and FIG. 5 is a cross-sectional view showing one ion generator as a comparative example; FIG. 6 is a cross-sectional view showing an ion generator according to still another example of the present invention; A cross-sectional view showing one of the ion generators as another comparative example is shown; FIG. 7 is a view showing comparison of the electrostatic removal effect of the ion generator of the present invention with the ion generator of the comparative example shown in FIG. FIG. 8 is a graph showing the results of a confirmation test for measuring the disturbance of ion balance by forcibly injecting fine particles, and is related to the ion generator of the present invention and the ion generator of the comparative example shown in FIG. 6; 9 is a characteristic diagram showing an ion balance effect of the ion generator of the present invention and the ion generator of the comparative example shown in FIG. 6; FIG. 10 is a view showing another example according to the present invention. Generating cross-sectional view of the sub-device; and FIG. 11 is a sectional view showing yet another example of the present invention is of an ion generator.

10a. . . Ion generator

11. . . Discharge unit

11. . . Electrode unit

12. . . Air supply unit

13. . . Cylindrical counter electrode

14. . . Cylindrical insulating member

15. . . Ion generating flow path

16. . . Discharge electrode

17. . . Power supply unit 20 compresses air pressure source

twenty one. . . Supply

twenty two. . . Air supply埠

twenty three. . . nozzle

twenty four. . . catheter

25. . . Constriction

26. . . Conical surface

27. . . Air inlet

28. . . Curved surface

29. . . Ejector

31. . . Inhalation

A. . . Supply line

Claims (18)

An ion generator having a discharge electrode and an opposite electrode provided opposite to the discharge electrode and applying an alternating high voltage across the discharge and the opposite electrode to cause a corona discharge to be generated, Thereby generating air ions, the ion generator comprising: a discharge unit including the discharge electrode and the opposite electrode, an ion generating flow path formed in the discharge unit; and an air supply unit disposed in the discharge unit a base end portion having an air supply port connected to the ion generating flow path and supplying compressed air to the ion generating flow path, wherein an air inlet is introduced into the outside air from an outside side a downstream side of the opposite electrode, and a ejector provided at a downstream side of the air inlet at the tip end portion of the discharge unit, which introduces external air from the air inlet to generate ions by a flow path through the ion Of these air ions. The ion generator of claim 1, wherein the discharge electrode is concentrically disposed at a center of the ion generating flow path. The ion generator of claim 1, wherein the discharge electrode is disposed in a direction across the ion generating flow path. An ion generator according to any one of claims 1 to 3, wherein the base end of the discharge unit has a suction port through which air ejected toward the ion generating flow path is The outside air is drawn in, and it supplies the outside air to the ion generating flow path. An ion generator according to any one of claims 1 to 3, wherein the tip end portion of the discharge unit has an auxiliary air inlet to which air flowing in from the air inlet has been added Thereafter, the outside air is supplied to the obtained air ions. An ion generator according to claim 4, wherein the tip end portion of the discharge unit has an auxiliary air inlet that supplies the outside air after the air flowing in from the air inlet has been added to the air ions. To the obtained air ions. An ion generator according to any one of claims 1 to 3, wherein an inner diameter of an air discharge port of the discharge unit is larger than an inner diameter of the ion generation flow path. An ion generator according to claim 4, wherein an inner diameter of an air discharge port of the discharge unit is larger than an inner diameter of the ion generation flow path. An ion generator according to claim 5, wherein an inner diameter of an air discharge port of the discharge unit is larger than an inner diameter of the ion generation flow path. An ion generator according to claim 6 wherein an inner diameter of an air discharge port of the discharge unit is larger than an inner diameter of the ion generation flow path. An ion generator according to any one of claims 1 to 3, wherein a conduit system for guiding the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the discharge unit On the tip end. An ion generator according to claim 4, wherein a conduit system for guiding the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit. An ion generator according to claim 5, wherein a conduit system for guiding the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit. An ion generator according to claim 6, wherein a conduit system for directing the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit. An ion generator according to claim 7, wherein a conduit system for guiding the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit. An ion generator according to claim 8 wherein a conduit system for directing the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit. An ion generator according to claim 9 wherein the air ions discharged from the discharge unit are directed to a guide member for removing static electricity. A piping system is mounted on the tip end portion of the discharge unit. An ion generator according to claim 10, wherein a conduit system for guiding the air ions discharged from the discharge unit to a member for removing static electricity is mounted on the tip end portion of the discharge unit.