High-concentration nitrogen oxide generating device capable of raising air pressure and generating a large amount of plasma containing high-concentration nitrogen oxide even in the case of blowing straight wind into a discharge chamber to lightning discharge

Abstract

The present invention relates to a high concentration nitric oxide generating device capable of raising the air pressure and generating a large amount of plasma containing high concentration nitric oxide even in the case of blowing straight wind into a discharge chamber to lightning discharge, and under the condition of delivering straight wind to the discharge chamber in an upwardly open state, the air pressure inside the discharge chamber is relatively raised compared to the atmospheric pressure, thereby enabling continuous generation of a large amount of plasma containing high concentration nitric oxide.

Description

Technical Field

[0001] This invention relates to a high-concentration nitrogen oxide generator employing a plasma state of lightning discharge, and more specifically, to an improved high-concentration nitrogen oxide generator that, under the condition of supplying a straight airflow to a discharge chamber in an upwardly open state, causes the air pressure inside the discharge chamber to rise relative to atmospheric pressure, thereby continuously generating a large amount of plasma containing a high concentration of nitrogen oxide. Background Technology

[0002] As described in the patent literature in the prior art, the inventors of the present invention have researched and developed a lightning discharge device that is commercially viable and capable of generating a large amount of plasma containing a high concentration of nitrogen oxides in a plasma state.

[0003] However, the drawback of the prior art is that when a straight airflow is supplied to the discharge chamber, the air pressure is relatively difficult to exceed atmospheric pressure, or the air pressure rise is very weak, thus making it impossible to generate a large amount of plasma containing a high concentration of nitrogen oxides.

[0004] Moreover, the problem with the existing technology is that, during the process of the straight air delivered from the blower being converted into a cyclone state by the cyclone conversion unit, as the wind intensity gradually weakens, not only does the air pressure inside the discharge chamber fail to rise significantly, but also, because the air delivered to the discharge chamber is in a cyclone state, the emission speed is relatively slower than that in a straight air state, thus causing a decrease in the hourly nitrogen oxide production.

[0005] Prior art document (patent document 0001): KR 10-1962904 B1 2019.03.27 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The purpose of this invention is to provide a high-concentration nitrogen oxide generator that can increase the air pressure and generate a large amount of plasma containing high concentrations of nitrogen oxide even when a straight wind is blown into the discharge chamber for lightning discharge. Under the condition of supplying a straight wind to the discharge chamber in an upward open state, the air pressure inside the discharge chamber is relatively increased compared to the atmospheric pressure, thereby continuously generating a large amount of plasma containing high concentrations of nitrogen oxide.

[0008] Another object of the present invention is to provide a high-concentration nitrogen oxide generating device, wherein discharge spark protrusions are provided on a pair of discharge plates receiving electrical components in order to generate a large number of discharge sparks, thereby enabling the acquisition of a large number of high-concentration nitrogen oxides in the plasma state.

[0009] The measures taken to solve the problem

[0010] The invention is characterized in that external air supplied to the gas chamber located at the bottom of the gas chamber is blown out in a straight line from the bottom of the elongated discharge chamber along the upward direction by a motor fan. In the discharge chamber, a pair of elongated electrode components that receive high-voltage current are provided with discharge sparks, and discharge sparks are generated between the discharge sparks facing each other. A bottleneck discharge section with a gradually narrowing air duct width is provided at the top of the discharge chamber, so that the air pressure of the discharge chamber blowing out the straight air is relatively higher than atmospheric pressure.

[0011] The discharge chamber is located inside the cylindrical tube. Inside the cylindrical tube, a pair of long plate-shaped electrode components are erected and fixed in a V-shape on a non-conductive support located at the bottom of the discharge chamber, thereby creating a bottleneck discharge section with a gradually narrowing air duct width at the top of the discharge chamber.

[0012] The pair of electrode components are also provided with a windbreak that is inclined along the direction of the cylindrical tube to form a bottleneck discharge zone.

[0013] The pair of electrode components are in the shape of inverted cones, with their lower ends fixed to a non-conductive support. In the pair of electrode components, the diameter of one electrode component is relatively larger than that of the other electrode component, so that the other electrode component with a relatively smaller diameter is fixed inside the electrode component with a relatively larger diameter, thereby forming a straight airflow into the discharge chamber between the pair of electrode components. In the pair of electrode components, compared to the gradient angle of the outer peripheral inclined surface of the electrode component with a relatively larger diameter, the upper end gradient angle of the outer peripheral inclined surface of the electrode component with a relatively smaller diameter has a gradient angle that is further inclined along the direction of the other electrode component, thereby forming a bottleneck discharge section at the upper part of the discharge chamber. In the pair of electrode components, multiple discharge spark protrusions facing each other are respectively provided on the inner peripheral surface of the electrode component with a relatively larger diameter and the outer peripheral surface of the electrode component with a relatively smaller diameter, thereby generating discharge sparks between the opposing discharge spark protrusions.

[0014] The outer peripheral inclined surfaces of the pair of electrode components are parallel to each other. The outer peripheral inclined surface of the electrode component located on the inner side is bent by a straight wind, which causes the air pressure in the discharge chamber to rise.

[0015] In the pair of electrode components, a windbreak portion inclined along the direction of the electrode component located on the inner side is provided at the upper end of the electrode component located on the outer side, so as to form a bottleneck discharge zone.

[0016] An inclined channel is formed in the upper part of the discharge chamber to bend the straight airflow, and a bottleneck air duct with a diameter relatively smaller than that of the discharge chamber is provided in the upper part of the inclined channel.

[0017] The effects of the invention

[0018] The high-concentration nitrogen oxide generator provided by the present invention has the following effect: under the condition of supplying a straight airflow to the discharge chamber in the upward open state, the air pressure inside the discharge chamber is relatively increased compared with the atmospheric pressure, thereby continuously generating a large amount of plasma containing high-concentration nitrogen oxide.

[0019] Furthermore, the high-concentration nitrogen oxide generator provided by the present invention has the following effect: in order to generate a large number of discharge sparks, discharge spark protrusions are provided on a pair of discharge plates receiving electrical components, thereby enabling the acquisition of a large amount of high-concentration nitrogen oxides in the plasma state.

[0020] Moreover, the present invention provides the following effect: when the air supplied to the discharge chamber is blown in a straight wind state, the discharge speed can be relatively faster than in a cyclone state as the air pressure rises. Therefore, not only is the production of nitrogen oxides increased, but the production cost of nitrogen oxides can also be reduced. Attached Figure Description

[0021] Figure 1 A longitudinal sectional view is shown for illustrating the high-concentration nitrogen oxide generator of the present invention.

[0022] Figure 2 A longitudinal sectional view is shown for illustrating a nitrogen oxide generating unit according to an embodiment of the present invention.

[0023] Figure 3 A perspective view showing a pair of electrode components in the form of a long plate according to the present invention.

[0024] Figure 4 This is a photograph of the discharge spark that occurs during the discharge state of the present invention.

[0025] Figure 5 An exploded perspective view of a nitrogen oxide generating unit according to another embodiment of the present invention is shown.

[0026] Figure 6 for Figure 5 A cross-sectional view of the nitrogen oxide generating unit of another embodiment is shown.

[0027] Figure 7 A longitudinal sectional view of a high-concentration nitrogen oxide generator according to another embodiment of the present invention is shown. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the preferred embodiments shown in the accompanying drawings.

[0029] In describing this invention, if it is determined that the detailed descriptions of the technical structures, known components, or known technologies in prior art patent No. 10-1962904 may obscure the spirit of this invention, detailed drawings and descriptions thereof will be omitted. Furthermore, detailed descriptions of the structural elements and their functions described above may be omitted in subsequent descriptions.

[0030] Example 1

[0031] Reference Figure 1 In this invention, the air filter F at the lower part of the gas 10 allows external air to flow into the gas chamber 12 through the air intake 11, and the air in the gas chamber 12 is supplied by the nitrogen oxide generating unit 20.

[0032] like Figure 1 and Figure 2 As shown, the nitrogen oxide generating unit 20 has a motor fan 21 at the bottom, through which air is blown into the elongated discharge chamber 23 of the vertical cylindrical tube 22 that opens upwards along a straight line.

[0033] On the other hand, for ease of understanding of the present invention, the wind blowing into the elongated discharge chamber 23 along a straight direction will be referred to as "straight wind" for explanation.

[0034] Therefore, in this invention, a pair of long plate-shaped electrode components 24 and 24' are disposed at the center of the elongated discharge chamber 23. The electrode components 24 and 24' face each other and receive positive and negative currents respectively from the high-voltage current amplifier 25. The upper ends 24a of the pair of electrode components 24 and 24' extend outward and are fixed to the supporting non-conductor 26 in a V-shape. Preferably, the supporting non-conductor 26 is an insulator.

[0035] Therefore, in the lower center of the discharge chamber 23, since the non-conductor 26 is fixed to the cylindrical tube 22 for support, the pair of electrode components 24, 24' can be in a V-shaped upright position even when separated from each other inside the discharge chamber 23. Figure 2 In the figure, reference numeral 27 indicates a current supply component that supplies current to the high-voltage current amplifier 24, reference numeral 28 indicates a high-voltage stabilizer, and reference numeral 29 indicates a grounding component.

[0036] like Figure 2 and Figure 3 As shown, a pair of electrode components 24, 24' each have a plurality of discharge flower protrusions 24b protruding from each electrode component 24, 24', such that the discharge flower protrusions 24b protruding from each electrode component 24, 24' face each other. Preferably, the electrode components 24, 24' are made of platinum or a platinum alloy with excellent conductivity.

[0037] Therefore, in this invention, the upper ends 24a of a pair of electrode components 24 and 24' are respectively inclined outward and arranged in a V-shape in the discharge chamber 23, so that the channel through which the straight wind passes becomes a state that gradually narrows from the lower part of the discharge chamber 23 to the upper part. As the upper ends 24a of the electrode components 24 and 24', a bottleneck discharge section 23a is provided in the upper part of the discharge chamber 23.

[0038] And, as Figure 2 and Figure 3 As shown, a windbreak portion 24c that is inclined and curved along the outer direction is also provided on the upper part of a pair of electrode components 24, 24', and a narrower bottleneck discharge section 23a' can be provided on the upper side of the bottleneck discharge section 23a through which the straight wind passes.

[0039] Therefore, as Figure 2 As indicated by the arrow, in this invention, the straight airflow inside the discharge chamber 23 collides with the outer surfaces of a pair of electrode components 24, 24', causing the straight airflow to bend. As the width of the straight airflow gradually narrows from the bottom to the top, since the straight airflow needs to pass through the bottleneck discharge intervals 23a, 23a', the air pressure inside the discharge chamber 23 is in a high-pressure state that is significantly higher than atmospheric pressure. Under this high-pressure state, as long as the straight airflow continues to blow into the discharge chamber 23, the high-pressure state can be maintained.

[0040] To facilitate understanding of this invention, when the inlet width or diameter of the straight-flowing air is relatively narrow or narrow compared to the outlet width or diameter of the straight-flowing air, the air pressure will rise due to the bottleneck phenomenon, resulting in a high-pressure state that is relatively higher than atmospheric pressure.

[0041] Therefore, when a high-voltage current is supplied to a pair of electrode components 24, 24' located in the high-voltage discharge chamber 23, an arc discharge occurs between the opposing discharge spark protrusions 24b of the electrode components 24, 24', generating a discharge spark. In this case, since discharge sparks occur between multiple discharge spark protrusions 24b, a large number of discharge sparks can be reliably generated. Figure 4 This is a photograph showing the discharge spark state that occurs in this invention through experiments.

[0042] To facilitate understanding of the present invention, in the prior art patent No. 10-1962904 invented by the inventor, when discharge occurs between linear flat electrode plates, the current cannot be concentrated at a single point, and therefore only a few discharge sparks can occur. However, in the present invention, since the current is concentrated at the discharge spark protrusion 24b, multiple discharge sparks corresponding to the number of discharge spark protrusions 24b can be generated, thereby generating a large amount of plasma, which in turn can generate plasma containing a high concentration of nitrogen oxides.

[0043] Therefore, as Figure 1 As shown, the air containing a large amount of high-concentration nitrogen oxide plasma discharged from the outlet 23b of the discharge chamber 23 into the return chamber 13 flows into the gas chamber 12 through multiple return holes 14a formed on the perforated plate 14 on one side of the cylindrical tube 22. After that, it is blown back into the discharge chamber 23 of the cylindrical tube 22 by the motor fan 21. As it mixes with the plasma containing high-concentration nitrogen oxide, an even higher concentration of nitrogen oxide can be obtained.

[0044] Furthermore, high-concentration nitrogen oxide activated water can be prepared by supplying air to a water tank T via a suction pump P connected to an exhaust port 15 located on the upper part of the reflux chamber 13, for example, a nanobubble generator B.

[0045] Therefore, the present invention, through the operation control unit 17, closes the on / off valve 11a provided at the air intake 11 and simultaneously stops the operation of the air intake pump 16, so that the plasma air containing nitrogen oxides in the return chamber 13 passes through the return hole 14a and the air chamber 12, and is then supplied to the discharge chamber 23 via the motor fan 21. By continuously performing this cycle, plasma containing an extremely high concentration of nitrogen oxides can be obtained. In this case, by intermittently opening and closing the on / off valve 11a and starting the air intake pump 16 through the control unit 17, an extremely high concentration of nitrogen oxides can be supplied to the water tank T.

[0046] Example 2

[0047] Reference Figure 5 and Figure 6 The pair of electrode components 240 and 240' of the present invention are in the shape of an inverted cone, and their lower ends are respectively fixed to the support non-conductor 260.

[0048] Furthermore, the diameter of the other electrode component 240' is relatively smaller than the diameter of one of the electrode components 240 in the pair of electrode components 240, 240', such that the other electrode component 240' with a relatively smaller diameter is fixed inside the electrode component 240 with a relatively larger diameter in the support non-conductor 260, thereby forming a straight airflow blowing into the discharge chamber 23 between the pair of electrode components 240, 240'.

[0049] Moreover, refer to Figure 6 In a pair of electrode components 240, 240', compared to the gradient angle of the inclined surface 240a of the outer periphery along the length direction of the electrode component 240 with a relatively larger diameter, such as Figure 6 As shown by the dashed line, the upper end of the outer peripheral inclined surface 240'a of the other electrode component 240', which has a relatively smaller diameter, has a gradient angle that is further inclined along the direction of the other electrode component 240, thereby forming a bottleneck discharge section 23a in the upper part of the discharge chamber 23.

[0050] Furthermore, in a pair of electrode components 240 and 240', a plurality of discharge spark protrusions 24b facing each other are respectively provided on the inner peripheral surface of the electrode component 240 with a relatively larger diameter and on the outer peripheral surface of the other electrode component 240' with a relatively smaller diameter, and discharge sparks are generated between the discharge spark protrusions 24b facing each other.

[0051] exist Figure 6 In the figure, reference numeral 27 indicates the current supply component, and reference numeral 261 indicates the air inlet.

[0052] Therefore, as Figure 6 As indicated by the arrow, in this invention, the straight airflow inside the discharge chamber 23 collides with the outer peripheral surface of the electrode component 240' located on the inner side, causing the straight airflow to bend. As the width of the straight airflow gradually narrows from the bottom to the top, since the straight airflow needs to pass through the bottleneck discharge section 23a, the air pressure inside the discharge chamber 23 is in a high-pressure state that is significantly higher than atmospheric pressure. Under this high-pressure state, as long as the straight airflow continues to blow into the discharge chamber 23, the high-pressure state can be maintained.

[0053] Furthermore, within the high-voltage discharge chamber 23, as an arc discharge occurs between the opposing discharge spark protrusions 24b, a discharge spark will be generated. In this case, since discharge sparks occur between multiple discharge spark protrusions 24b, a large number of discharge sparks can indeed occur.

[0054] On the other hand, such as Figure 6 As shown by the solid line, in this invention, since the outer peripheral inclined surfaces 240a and 240'a of a pair of electrode components 240 and 240' are parallel to each other, the outer peripheral inclined surface 240'a of the electrode component 240' located on the inner side is in a bent state due to the straight wind. The straight wind is blocked momentarily during the movement, and the lower side is continuously subjected to strong straight wind. Therefore, the gas pressure in the discharge chamber 23 is in an upward state.

[0055] Furthermore, in the pair of electrode components 240 and 240', a windbreak portion 24c inclined along the direction of the electrode component 240 located on the inner side is provided at the upper end of the electrode component 240' located on the outer side to form a bottleneck discharge section. Therefore, a narrower bottleneck discharge section 23a' can be provided on the upper side of the bottleneck discharge section 23a through which the straight wind passes, thereby achieving a pressure rise that is relatively higher than atmospheric pressure in the discharge chamber 23.

[0056] Example 3

[0057] In explanation Figure 7 During the process, the structural elements that are the same as those in the nitrogen oxide generating unit 20 described above, as well as the functions of those structural elements, will be omitted.

[0058] Therefore, the present invention may provide one or more discharge chambers 23, in which an electric arc discharge can occur through a pair of electrode components 24, 24', 240, 240'.

[0059] To this end, the present invention forms an inclined channel 23c on the upper part of the discharge chamber 23, which causes the straight airflow to bend, and a bottleneck airflow duct 23d with a diameter relatively smaller than that of the discharge chamber 23 is provided on the upper part of the inclined channel 23c.

[0060] Therefore, the straight wind discharged through the outlet 23b of the discharge chamber 23 collides with the inclined channel 23c, causing the straight wind to bend. As the width of the straight wind gradually narrows from the bottom to the top, and since the straight wind needs to pass through the bottleneck channel 23d, the air pressure inside the discharge chamber 23 is in a high-pressure state that is much higher than atmospheric pressure. Under this high-pressure state, as long as the straight wind continues to blow into the discharge chamber 23, the high-pressure state can be maintained.

[0061] Furthermore, the straight airflow through the bottleneck duct 23a'' is discharged through the exhaust port 15 via the U-shaped duct 19 centered on the partition 18. By reducing the speed of the straight airflow, the rising air pressure inside the discharge chamber 23 can be prevented from dropping and the rising air pressure can be maintained.

[0062] On the other hand, the present invention also provides a cyclone conversion unit 30 at the lower part of the discharge chamber 23. The cyclone conversion unit 30 causes the straight air blown in by the motor fan 21 to be blown in at an angle toward the inner peripheral surface of the discharge chamber 23, thereby generating a cyclone in the discharge chamber 23. Since this technology is a technical structure that the inventor has described in detail in the prior art patent publication No. 10-1962904, its drawings and detailed description are omitted here.

[0063] Therefore, when a cyclone is generated in the discharge chamber 23, the air pressure is rising. At the same time, as the wind passes through the bottleneck discharge sections 23a, 23a' and the bottleneck air duct 23d, the air pressure in the discharge chamber 23 also rises. Therefore, the discharge chamber 23 can reliably form a high-pressure state that is higher than atmospheric pressure. Under this high-pressure condition, a large number of discharge sparks are generated through arc discharge, thus a high concentration of nitrogen oxides can be obtained.

[0064] Therefore, the present invention is not limited to the description with reference to the accompanying drawings. Those skilled in the art can implement the invention in various ways. Thus, it is obvious that the invention should be widely protected without departing from the scope of the claims.

[0065] Explanation of reference numerals in the attached figures

[0066] 10: Gas 11: Inlet

[0067] 11a: On / off valve; 12: Gas chamber

[0068] 13: Reflux chamber 14: Perforated plate

[0069] 14a: Return hole; 15: Exhaust port

[0070] 16: Suction pump 17: Control unit

[0071] 18: Partition plate 19: U-shaped air duct

[0072] 20: Nitrogen oxide generating unit; 21: Motor fan

[0073] 22: Cylindrical tube 23: Discharge chamber

[0074] 23a, 23a': Bottleneck discharge zone; 23b: Exit

[0075] 23c: Inclined channel; 23d: Bottleneck air duct

[0076] 24, 24', 240, 240': Electrode component 24a: Upper end

[0077] 24b: Voltage discharge spark protrusion; 24c: Windproof section

[0078] 25: High-voltage current amplifier; 26, 260: Non-conductor for support.

[0079] 27: Current supply component 28: High voltage stabilizer

[0080] 29: Grounding component; 30: Cyclone conversion unit; 0

[0081] 240a, 240'a: Outer peripheral inclined surface; 261: Air inlet.

[0082] F: Air filter T: Water tank

[0083] B: Nanobubbler

Claims

1. A high-concentration nitrogen oxide generator capable of increasing air pressure and generating a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, characterized in that, The external air supplied to the gas chamber (12) located at the bottom of the gas (10) is blown out in a straight line from the bottom of the elongated discharge chamber (23) along the upward direction by the motor fan (21). In the discharge chamber (23), a pair of elongated electrode components (24, 24') (240, 240') that receive high-voltage current are provided with discharge spark protrusions (24b), and discharge sparks are generated between the discharge spark protrusions (24b) facing each other. A bottleneck discharge section (23a) with a gradually narrowing air duct width is provided at the upper part of the discharge chamber (23), so that the air pressure of the discharge chamber (23) blowing out straight air is relatively higher than the atmospheric pressure.

2. The high-concentration nitrogen oxide generator according to claim 1, which can increase the air pressure and generate a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, is characterized in that... The discharge chamber (23) is located inside the cylindrical tube (22). Inside the cylindrical tube (22), a pair of long plate-shaped electrode components (24, 24') are erected in a V-shape on a support non-conductor (26) located at the bottom of the discharge chamber (23), thereby providing a bottleneck discharge section (23a) with a gradually narrowing air duct width at the top of the discharge chamber (23).

3. The high-concentration nitrogen oxide generator according to claim 2, which can increase the air pressure and generate a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, is characterized in that... The pair of electrode components (24, 24') are also provided with a windbreak (24c) that is inclined along the direction of the cylindrical tube (22) to form a bottleneck discharge section (23a').

4. The high-concentration nitrogen oxide generator according to claim 1, which can increase the air pressure and generate a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, is characterized in that... The pair of electrode components (240, 240') are in the shape of an inverted cone, and their lower ends are respectively fixed to a supporting non-conductor (260). In the pair of electrode components (240, 240'), the diameter of one electrode component (240) is relatively larger than the diameter of the other electrode component (240'), such that the other electrode component (240') with a relatively smaller diameter is fixed inside the electrode component (240) with a relatively larger diameter, thereby forming a discharge chamber (23) between the pair of electrode components (240, 240') where a straight wind blows in. In the pair of electrode components (240, 240'), compared to the gradient angle of the outer peripheral inclined surface (240a) in the longitudinal direction of the electrode component (240) with a relatively larger diameter, the upper end gradient angle of the outer peripheral inclined surface (240'a) of the other electrode component (240') with a relatively smaller diameter has a gradient angle that is further inclined along the direction of the other electrode component (240), thereby forming a bottleneck discharge section (23a) in the upper part of the discharge chamber (23). In the pair of electrode components (240, 240'), a plurality of discharge spark protrusions (24b) facing each other are respectively provided on the inner peripheral surface of the electrode component (240) with a relatively larger diameter and on the outer peripheral surface of the other electrode component (240') with a relatively smaller diameter, thereby generating a discharge spark between the discharge spark protrusions (24b) facing each other.

5. The high-concentration nitrogen oxide generator according to claim 4, which can increase the air pressure and generate a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, is characterized in that... The outer peripheral inclined surfaces (240a, 240'a) of the pair of electrode components (240, 240') are parallel to each other. The outer peripheral inclined surface (240'a) of the electrode component (240') located on the inner side is bent by a straight wind, which causes the air pressure in the discharge chamber (23) to rise.

6. A high-concentration nitrogen oxide generator, as described in any one of claims 4 and 5, capable of increasing air pressure and generating a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, characterized in that... In the pair of electrode components (240, 240'), a windbreak (24c) inclined along the direction of the electrode component (240) located on the inner side is also provided at the upper end of the electrode component (240') located on the outer side, so as to form a bottleneck discharge section (23a').

7. The high-concentration nitrogen oxide generator according to claim 1, which can increase the air pressure and generate a large amount of plasma containing high-concentration nitrogen oxides even when a straight wind is blown into the discharge chamber for lightning discharge, is characterized in that... An inclined channel (23c) is formed in the upper part of the discharge chamber (23) to bend the straight wind, and a bottleneck air duct (23d) with a diameter relatively smaller than that of the discharge chamber (23) is provided in the upper part of the inclined channel (23c).

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