JP6161045B2 - Discharge device - Google Patents

Description

  The present invention relates to a discharge device that can be used in an environment where explosion-proof specifications are required.

As this type of device, a discharge device shown in Patent Document 1 is known.
As shown in FIG. 4, the discharge device includes three discharge electrode needles 2 in a cylindrical casing body 1. The casing body 1 is a cylindrical member having both ends opened, and the rear end is covered with a cover.
On the other hand, a mounting block 3 made of an insulating material is press-fitted into the opening on the front end side of the casing body 1, a ground electrode plate 4 is applied to the mounting block 3, and a pressing plate 5 is brought into close contact with the ground electrode plate 4. ing. The pressing plate 5 is fixed to the mounting block 3 with a screw member 6 and the mounting block 3 and the ground electrode plate 4 are sealed with a sealing member 7 made of an insulating material. The ground electrode plate 4 is formed with pores 4a having a size that radiates an ion wind and prevents entry of foreign matter from the outside.

  In such a discharge device, since the ground electrode plate 4 is applied to the mounting block 3, the ground electrode plate 4 may bend away from the mounting block 3 when the pressure in the casing increases. When the ground electrode plate 4 is bent in this manner, a gap is formed between the mounting block 3 and the ground electrode plate 4, and high-pressure fluid leaks from there. If the high-pressure fluid leaks from the gap, it becomes difficult for the ion wind to be ejected from the pores 4a. Therefore, the sealing member 7 is used to prevent the high-pressure fluid from leaking even when the ground electrode plate is bent as described above. The seal member 7 is an expensive explosion-proof specification made of a flame-retardant material.

Further, this discharge device requires a ring-shaped pressing plate 5, a screw member 6, and a seal member 7 when the earth electrode plate 4 is attached to the attachment block 3.
Furthermore, even if the sealing member 7 is provided, it is necessary to keep the amount of bending of the ground electrode plate 4 small. In order to suppress the amount of bending of the ground electrode plate 4 to be small, the number of screw members 6 must be increased and the number of necessary parts is large in order to press the pressing plate 5 evenly.

JP 2012-182054 A

In the above-described conventional discharge device, the ion wind radiated from the pores spreads in the diameter direction of the casing, and the momentum in the straight traveling direction may not be maintained. Therefore, there has been a problem that the amount of ions that reach far away is reduced.
An object of the present invention is to provide an ion emission device capable of causing an ion wind emitted from a pore to reach a farther distance.

A first invention is a cylindrical casing connected to a high pressure fluid source and sealed, a plurality of discharge electrode needles provided in the casing, a plurality of fine electrodes for fluid emission while facing the discharge electrode needles. When a high voltage is applied to the discharge electrode needle, a discharge is generated between the discharge electrode needle and the ground electrode plate to generate ions, and the generated ions are A discharge device that radiates from the pores together with the fluid is assumed.
On the premise of the discharge device, the first invention provides a ring portion integrally around the ground electrode plate, and the outer peripheral surface of the ring portion abuts on the inner peripheral surface of the casing and is press-fitted and fixed. with the tip of the ring portion, projecting in a radial direction downstream side of the ion with respect to the ground electrode plate, wherein the recesses are formed between these ring portions and the grounding electrode plate.

  The second invention is characterized in that a larger number of pores than the discharge electrode needle are formed in the ground electrode plate, and at least one pore is opposed to the tip of the discharge electrode needle.

  According to a third aspect of the present invention, the ground electrode plate includes a plurality of pore groups composed of the plurality of pores, and the pore groups are arranged at equal intervals on a circumference centered on the axis of the casing. It was made to be characterized.

  According to a fourth aspect of the invention, a plurality of fluid introduction paths that are continuous with the pores are formed of an insulating material in the casing, and the plurality of pores correspond to one fluid introduction path.

  In this invention, since the tip of the ring part around the earth electrode plate protrudes downstream in the ion emission direction to form a recess, this recess exerts a fluid guiding function and is emitted from the pores. The spread of the ionic wind in the diameter direction can be suppressed. Thus, if the spread of the ion wind in the diameter direction is suppressed, the momentum in the straight traveling direction is maintained, and ions can reach farther.

In the second invention, since more pores are provided than the discharge electrode needle, even if the diameter of one pore is reduced, a large number of pores are formed, thereby ensuring the air supply flow rate. A smooth flow can be created to efficiently radiate ion wind.
In the fourth invention, by making a plurality of pores correspond to one fluid introduction path, high-pressure fluid can be efficiently guided to a large number of pores, and high-pressure fluid can be emitted from each pore. . As a result, ions are efficiently radiated from the pores facing the discharge electrode needles, and the flow of fluid radiated from other pores merges to further disperse the ions emitted from the pores. Can lead.

FIG. 1 is a sectional view of a discharge device according to an embodiment of the present invention. FIG. 2 is a front view of the embodiment. FIG. 3 is a bottom view of the embodiment. FIG. 4 is a cross-sectional view of a conventional discharge device.

1 to 3 show an embodiment of the present invention.
This discharge device is an explosion-proof device provided with three discharge electrode needles 2 (see FIGS. 1 and 2) in a cylindrical casing body 1. In this embodiment, high-pressure air is used as the high-pressure fluid.
1 is a cross-sectional view of the casing main body 1 including the axis, FIG. 2 is a front view, and FIG. 3 is a bottom view.

The casing body 1 is a cylindrical member made of a conductive material such as aluminum and having both ends opened. The front end side is closed with a metal pore header 8 and the rear end side is covered with a cover member 9.
The cover member 9 is provided with a ground terminal 30, and a ground wire is connected to the ground terminal 30. Therefore, the pore header 8 is grounded via the casing body 1.

  The pore header 8 includes a ground electrode 10 having a plurality of pores 10a and a ring portion 11 formed integrally around the electrode 10 and having a predetermined length in the axial direction. The ring portion 11 is press-fitted into the opening on the front end side of the casing body 1 and is fixed from the outer surface of the casing body 1 by a screw member 12 having a hexagonal hole. The ring portion 11 has a predetermined length in the axial direction, and when press-fitted, the outer peripheral surface and the inner peripheral surface of the casing body 1 are brought into close contact with each other to exert a sealing function. Therefore, it is not necessary to provide a seal member between the pore header 8 and the casing body 1.

A disc-shaped sealing block 13 is press-fitted into the inner periphery of the casing body 1 at the rear end side, and the sealing block 13 is fixed from the outer periphery of the casing body 1 with a screw member 12. The sealing property between the sealing block 13 and the casing body 1 is also maintained.
Therefore, the inside of the casing body 1 and between the sealing block 13 and the pore header 8 constitutes the inside of the sealed casing of the present invention.

The pore 10a of the earth electrode plate 10 is a hole for radiating the air guided into the casing body 1, and has a size capable of preventing the entry of foreign matter from the outside, as with the pores of the conventional discharge device. It is a thing. In this embodiment, all the pores 10a have the same opening diameter of less than 1 [mm].
Further, in this embodiment, five pores 10a are grouped into a pore group, and the pores 10a are formed on the circumference centering on the axis of the casing body 1 in the ground electrode plate 10. Six sets of pore groups are arranged at equal intervals (see FIG. 2). That is, the earth electrode plate 10 has a total of 30 pores 10a.

A resin mounting block 14 is fixed to the inside of the pore header 8 by a screw member. In the mounting block 14, a plurality of air introduction passages 14a as fluid introduction passages of the present invention penetrating in the axial direction are formed at predetermined intervals in the circumferential direction.
In each air introduction path 14a, each of the five pore groups of the pores 10a is positioned.

As shown in FIG. 1, an electrode holding member 15 is provided behind the mounting block 14, and the electrode needle 2 is attached thereto.
The electrode holding member 15 is made of a conductive member such as stainless steel, includes a plate-like protruding portion 15a protruding in three directions, and the discharge electrode needle 2 is attached to the tip of each protruding portion 15a. A screw hole 15b in which a female screw is formed is formed at the tip of the protruding portion 15a, and a screw portion 2a is formed on the outer periphery on the proximal end side of the discharge electrode needle 2. The screw portion 2a is screwed into the screw hole 15b. Stop at.
Further, a set nut 16 is screwed into the threaded portion 2 a of the discharge electrode needle 2 to fix the position of the discharge electrode needle 2.

A metal rod-like support member 17 is inserted and fixed at the center of the electrode holding member 15 holding the discharge electrode needle 2 as described above, and this support member 17 is screwed to the center of the mounting block 14. I am doing so. At this time, the tip of each discharge electrode needle 2 corresponds to a different air introduction path 14a and is opposed to the pore 10a formed in the ground electrode plate 10. In this embodiment, the one air introduction path 14a is connected to one pore group in which the five pores 10a form a set. The tip of the discharge electrode needle 2 is directly opposed to the hole 10a.
The discharge electrode needle 2 and the earth electrode plate 10 attached in this way are electrically insulated by interposing the resin attachment block 14 therebetween.

In this embodiment, three discharge electrode needles 2 are provided in the casing body 1, but the number of discharge electrode needles 2 is not limited to three. However, the number of the pores 10a is set to be larger than the number of the discharge electrode needles 2.
In this embodiment, 30 pores 10a are formed and six air introduction passages 14a are formed. However, the number of the pores 10a and the air introduction passages 14a is not limited to the above. What is necessary is just to be comprised so that the said micropore 10a and the air introduction path 14a may respond | correspond, and high pressure air is guide | induced to each said micropore 10a via the air introduction path 14a.

Furthermore, if the set nut 16 screwed to the discharge electrode needle 2 is loosened, the discharge electrode needle 2 can be rotated and moved in the axial direction to adjust the position of the discharge electrode needle 2. When the position of the discharge electrode needle 2 is changed, the distance from the tip of the discharge electrode needle 2 to the pore 10a is changed, so that the amount of ions emitted can be changed.
However, since the radiation amount of ions is affected not only by the position of the discharge electrode needle 2, but also by the number of discharge electrode needles 2, the voltage applied to the discharge electrode needle 2, the air flow rate, and the like, It is necessary to adjust according to the purpose.

  The tip of the ring portion 11 of the pore header 8 protrudes toward the downstream side in the ion emission direction, which is outside the casing body 1, and forms a recess 8 a between the ground electrode plate 10 and the ground electrode plate 10 ( 1 and 2). The air flow radiated from the pores 10a into the recess 8a is suppressed from spreading in the diametrical direction, and the recess 8a serves as a guide, and the momentum in the straight direction of the ion wind is maintained. become. Thereby, it becomes possible to make ions reach farther.

Further, as shown in FIG. 1, a power supply control circuit 19 is attached to the mounting block 14 via a support member 18, and an output terminal (not shown) of the power supply control circuit 19 is connected to the electrode holding member 15. ing.
The power supply control circuit 19 is a circuit that includes a printed circuit board on which a step-up transformer 20 and the like are mounted, and converts a voltage supplied from an external power supply into a high voltage and outputs the voltage. The high voltage output from the power supply control circuit 19 is applied to the discharge electrode needle 2 via the electrode holding member 15.

  As described above, in this embodiment, since the power supply control circuit 19 that outputs a high voltage is provided in the casing body 1, it is not necessary to provide a high voltage cable outside the casing body 1. For this reason, it is possible to eliminate the danger caused by leakage or discharge due to the high-voltage cable being routed, and the adverse effects of noise on other electronic devices.

On the other hand, as shown in FIG. 3, a cable attachment hole 21 and an air supply hole 22 are passed through the sealing block 13 that is located in the cover member 9 and press-fitted into the casing body 1 (see FIG. 1). ).
The cable attachment hole 21 is a hole for attaching a connector (not shown) for connecting a low voltage cable connected to an external controller (not shown) and the power control circuit 19 in the casing body 1, and supplying the air The hole 22 is a hole for attaching a connector for an air tube connected to a high-pressure air supply source (not shown).
The cover member 9 is also formed with openings 9a and 9b for drawing out the low voltage cable, the air tube, and the like.

Further, as shown in FIGS. 1 and 3, a pair of pressure sensors 23 and 23 for detecting the pressure in the casing are attached to the sealing block 13. These pressure sensors 23 are fixed to a through hole (not shown) penetrating the sealing block 13 with a detection portion facing each other.
The signal line of the pressure sensor 23 is pulled out from the cover member 9 together with the low voltage cable and connected to a display unit (not shown) to display the detected value.
As described above, the pair of pressure sensors 23 is provided in the casing body 1 so that when one of the pressure sensors 23 fails, the detection signal of the other pressure sensor 23 can be confirmed.

The operation of the discharge device of this embodiment configured as described above will be described below.
When this discharge device is used, a ground wire is connected to the ground terminal 30 provided on the cover member 9, and the casing body 1 and the ground electrode plate 10 are grounded.
First, air is supplied into the casing body 1 from a high-pressure air supply source, which is a high-pressure fluid source, via an air tube (not shown), and it is confirmed by the display section that the detection value of the pressure sensor 23 becomes a predetermined pressure. Turn the power on.
The predetermined pressure is a pressure at which air supplied into the casing is reliably radiated from the pores 10a of the ground electrode plate 10 and can prevent foreign matter from entering. That is, the pressure is higher than the external pressure.

As described above, by checking the pressure of the pressure sensor 23, a high voltage can be applied after air purging the casing body 1, that is, the periphery of the discharge electrode needle 2.
By this air purge, foreign matter in the casing body 1 can be discharged before a high voltage is applied to the discharge electrode needle 2, and the pore 10a is inserted into the casing body 1 from the pore 10a when a high voltage is applied. Smaller foreign matter can be prevented.
Therefore, it is possible to prevent a foreign matter such as metal powder from approaching the discharge electrode needle 2 in a state where a high voltage is applied, and generating a spark due to discharge.

As described above, when air is supplied into the casing body 1 from the high-pressure air supply source, the air is radiated from the thirty pores 10a. At this time, since air is guided to the pore 10a by the air introduction path 14a formed in the mounting block 14, the air in the casing body 1 flows in the axial direction without much disturbance.
When a high voltage is applied to the discharge electrode needle 2 in a state where such an axial air flow is formed, ions generated on the distal end side of the discharge electrode needle 2 ride on the air and form an ion wind as the discharge electrode needle. 2 is emitted from the pores 10a facing to the surface 2a.

In this embodiment, the air flow is adjusted by the air introduction path 14 a and the pore 10 a is provided at a position facing the discharge electrode needle 2, so that the generated ions face the tip of the discharge electrode needle 2. The ions are not easily neutralized by colliding with the side surface of the casing body 1 or the like until they are radiated to the outside through the air flow radiated from the pores 10a and the plurality of pores 10a arranged around the pores 10a. It is like that.
That is, the generated ions can be emitted efficiently.

The ion wind is mainly emitted from the pores 10a continuous with the air introduction path 14a corresponding to the discharge electrode needle 2, and air containing almost no ions is emitted from the other pores 10a. It will be. Thus, although ions are hardly emitted from the pore 10a not facing the tip of the discharge electrode needle 2, the reason for providing such a pore 10a is as follows.
In this discharge device, the diameter of the pore 10a is less than 1 [mm] so that foreign matter is not easily mixed into the casing body 1, but if the diameter of the pore 10a is reduced in this way, the air is smooth. May not flow. If the air does not flow smoothly, the generated ions are neutralized in the casing body 1 and the ion wind is not emitted to the outside. Therefore, in this embodiment, even if the diameter of the pores 10a is reduced, the number of the pores 10a is increased in order to secure a supply flow rate of air and create a smooth flow.

As described above, the discharge device of this embodiment is configured so that the discharge electrode needle 2 provided in a hermetically sealed casing is free of foreign matter that may cause sparks while the discharge electrode needle 2 is not mixed. 2 can be efficiently emitted as an ion wind without waste.
Further, a recess 8a is formed between the ring portion 11 and the earth electrode plate 10, and the recess 8a guides the air flow radiated from the pore 10a in the straight traveling direction. The ion wind can reach farther.

Further, in the discharge device, the ring portion 11 is provided around the ground electrode plate 10, and the ring portion 11 is configured to exhibit a sealing function with the casing body 1, so that it is expensive as in the conventional device. The seal member 7 and the pressing plate 5 are not necessary.
Further, since the pressing plate 5 is not required, a large number of screw members 6 for attaching the pressing plate 5 are not necessary, and the total number of parts can be reduced.
In this way, the number of parts can be reduced, so that not only the part cost can be reduced, but also the assembly man-hours can be reduced and the manufacturing cost can be reduced.
In particular, since an expensive seal member made of a flame retardant material is not necessary, the component cost can be further reduced.

The discharge device supplies air to the discharge electrode needle 2 after confirming that the pressure in the casing is equal to or higher than a predetermined pressure by supplying air. Confirmation and power control may be performed manually by an operator, or may be automatically controlled by a controller or the like.
When the discharge device is used as an earth checker, a high-pressure air supply source and a surface electrometer are connected to the controller, and the timing of starting the air supply, turning on the power, starting the measurement of the surface electrometer, etc. Can be automatically controlled.
Further, the discharge device of the above embodiment can change the polarity of the output voltage of the power supply control circuit 19 alternately between plus and minus, so that not only as a charging device but also plus and minus ions. It can also be used as a static elimination device for explosion protection that radiates alternately.

  The discharge device of the present invention is useful as a charging device or a static eliminator in various environments where explosion-proof specifications are required.

DESCRIPTION OF SYMBOLS 1 Casing body 2 Discharge electrode needle 8 Porous header 8a Recessed part 10 Ground electrode plate 10a Fine hole 11 Ring part 14a Air introduction path

Claims (4)

A cylindrical casing connected to a high pressure fluid source and sealed;
A plurality of discharge electrode needles provided in the casing;
A ground electrode plate provided with a plurality of pores for fluid emission while facing the discharge electrode needle,
When a high voltage is applied to the discharge electrode needle, it is discharged between the discharge electrode needle and the ground electrode plate to generate ions,
A discharge device for emitting the generated ions from the pore together with the fluid,
Around the ground electrode plate, a ring portion is integrally provided ,
With the outer peripheral surface of the ring portion is press-fitted in contact with the inner peripheral surface of the casing, the front end of the ring portion, such ring portion projecting in a radial direction downstream side of the ion with respect to the grounding electrode plate Discharge device in which a recess is formed between the electrode plate and the ground electrode plate. To the grounding electrode plate, a discharge device according to the electric discharger many pores are formed than Rutotomoni claim 1 which are opposed to at least one of the pores on the tip of the discharge electrode needle. To the grounding electrode plate, claims plurality of pores group consisting of a plurality of the pores while being configured, the pore groups are arranged at equal intervals on a circumference around the axial center of the casing The discharge device according to 1 or 2. In the casing, a plurality of fluid introduction path continuous with the pores formed of an insulating material, the discharge according to a plurality of pores in one of the fluid introducing passage to any one of claims 1 to 3 in correspondence apparatus.

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