High-concentration nitrogen oxide generator for generating large amount of plasma having high-concentration nitrogen oxide by having increased air pressure, even if linear wind blows into discharge chamber in which thunderbolt discharge occurs

Abstract

The present invention relates to a high-concentration nitrogen oxide generator for generating a large amount of plasma having high-concentration nitrogen oxide by having increased air pressure, even if a linear wind blows into a discharge chamber in which thunderbolt discharge occurs, the generator being improved such that a large amount of plasma having a high concentration of nitrogen oxide is continuously generated, as the inside of a discharge chamber has a higher air pressure than atmospheric pressure, even under conditions where a linear wind blows into a discharge chamber having an open top.

Description

A high-concentration nitrogen oxide generator that generates a large amount of plasma with high concentration of nitrogen oxide by increasing the air pressure even when a straight wind blows in the discharge chamber where the thunderbolt discharge is performed.

[0001] The present invention relates to a high-concentration nitrogen oxide generator in a plasma state by means of a thunderbolt discharge, and more particularly, to an improved high-concentration nitrogen oxide generator that can continuously generate a large amount of plasma having a high concentration of nitrogen oxide by increasing the pressure inside the discharge chamber relatively higher than the atmospheric pressure even under conditions in which a straight wind is blown into a discharge chamber with the upper part open.

[0002] A thunderbolt discharge device that generates a large amount of plasma having a high concentration of nitrogen oxide in a commercially viable plasma state, as described in the patent document of the prior art literature, has been researched and developed by the inventor of the present invention.

[0003] However, the above-mentioned prior art has a disadvantage in that, when a straight wind is blown into the discharge room, the air pressure does not increase relatively compared to the atmospheric pressure or increases very slightly, so a large amount of plasma with a high concentration of nitrogen oxide is not generated.

[0004] In addition, in the prior art, the wind speed gradually weakened during the process of converting the straight wind blown from the blower into a vortex state by the vortex conversion means, so not only did the pressure inside the discharge chamber not increase significantly, but the wind blown into the discharge chamber blew in a vortex state, so the discharge speed was relatively slow compared to the straight wind state, which caused a problem of a decrease in the amount of nitrogen oxide produced per hour.

[0005]

[0006] <Prior Art Document> (Patent Document 0001) KR 10-1962904 B1 2019.03.27

[0007] The purpose of the present invention is to provide a high-concentration nitrogen oxide generator capable of generating a large amount of plasma having a high concentration of nitrogen oxide by increasing the pressure inside the discharge chamber relative to the atmospheric pressure even under conditions where a straight wind blows into the discharge chamber with the upper part open, thereby improving the thunderbolt discharge, and generating a large amount of plasma having a high concentration of nitrogen oxide by increasing the pressure even when a straight wind blows into the discharge chamber.

[0008]

[0009] Another object of the present invention is to provide a high-concentration nitrogen oxide generator capable of obtaining a large amount of high-concentration nitrogen oxide in a plasma state by providing a discharge embossing projection on a pair of discharge plates supplied with electricity to generate a large amount of discharge sparks.

[0010] The present invention is characterized in that external air supplied to an air chamber provided at the lower part of a body is configured to blow a straight wind upward from the lower part of a long-shaped discharge chamber by a motor fan, and in the discharge chamber, a plurality of long-shaped electrode members each supplied with a high-voltage current are provided, and a discharge spark is generated between the discharge embossing projections facing each other, and a bottleneck discharge section having a narrow wind path width is provided at the upper part of the discharge chamber so that the pressure in the discharge chamber where the straight wind blows is relatively higher than the atmospheric pressure.

[0011] Another feature is that the above discharge chamber is provided inside a cylindrical tube, and a pair of long plate-shaped electrode members are fixed in a V shape to a supporting insulator provided at the bottom of the discharge chamber, so that a bottleneck discharge section with a narrow wind passage width is provided at the top of the discharge chamber.

[0012] Another feature is that the upper part of the pair of electrode members is further provided with a wind blocking portion inclined in the direction of the cylindrical tube to form a bottleneck discharge section.

[0013] The above pair of electrode members is configured in the shape of an inverted cone so that the lower ends are respectively fixed to a supporting insulator, and one of the electrode members of the pair has a diameter that is relatively smaller than the diameter of the other electrode member, so that the other electrode member having a relatively smaller diameter is fixed inside the electrode member having a relatively larger diameter, so that a discharge chamber in which a straight wind blows is provided between the pair of electrode members, and the upper end of the outer slant surface of the other electrode member having a relatively smaller diameter than the slope angle of the longitudinal outer slant surface of one of the electrode members having a relatively larger diameter among the pair of electrode members has a slope angle that is relatively more inclined in the direction of one of the electrode members, so that a bottleneck discharge section is provided at the upper part of the discharge chamber, and a plurality of mutually opposed discharge embossing projections are respectively provided on the inner surface of one of the electrode members having a relatively larger diameter among the pair of electrode members and the outer surface of the other electrode member having a relatively smaller diameter among the pair of electrode members, so that each of the mutually opposed discharge embossing projections is provided. Another feature is that it is configured so that a discharge spark is generated between the discharge embossing projections.

[0014] Another feature is that the outer peripheral slopes of the pair of electrode members are configured to be parallel, so that a straight wind hits the outer peripheral slope of the electrode member provided relatively on the inner side and bends it, thereby increasing the pressure in the discharge chamber.

[0015] Another feature is that among the pair of electrode members, a wind blocking portion is further provided on the upper part of the electrode member provided relatively inwardly, and is inclined in the direction of the electrode member provided relatively outwardly, so as to have a bottleneck discharge section.

[0016] Another feature is that the discharge chamber is configured to have an inclined passage that bends the straight wind at the top, and a bottleneck wind passage having a relatively smaller diameter than the discharge chamber is provided at the top of the inclined passage.

[0017] The present invention has the effect of providing a high-concentration nitrogen oxide generator that continuously generates a large amount of plasma having a high concentration of nitrogen oxide by increasing the pressure inside the discharge chamber relatively higher than the atmospheric pressure even under conditions in which a straight wind is blown into the discharge chamber with the upper part open.

[0018] In addition, the present invention has the effect of providing a high-concentration nitrogen oxide generator capable of obtaining a large amount of high-concentration nitrogen oxide in a plasma state by providing a plurality of discharge embossing projections on a pair of discharge plates supplied with electricity to generate a large amount of discharge sparks.

[0019] In addition, the present invention has the effect of increasing the amount of nitrogen oxide produced by increasing the pressure of the wind blowing into the discharge chamber in a straight line, thereby making the discharge speed relatively faster than when the wind blows in a whirlwind state, and thereby providing the effect of reducing the cost of producing nitrogen oxide.

[0020] Figure 1 is a cross-sectional view showing a high-concentration nitrogen oxide generating device according to the present invention.

[0021] Figure 2 is a cross-sectional view showing a nitrogen oxide generating means according to one embodiment of the present invention.

[0022] Figure 3 is a perspective view showing a pair of long plate-shaped electrode members according to the present invention.

[0023] Figure 4 is a photograph of a discharge spark generated in a discharge state according to the present invention.

[0024] Figure 5 is an exploded perspective view showing a nitrogen oxide generating means of another embodiment of the present invention.

[0025] Fig. 6 is a cross-sectional configuration diagram of a nitrogen oxide generating means of another embodiment shown in Fig. 5;

[0026] Figure 7 is a cross-sectional view showing a high-concentration nitrogen oxide generating device of another embodiment of the present invention.

[0027] The present invention will be described in more detail with reference to the attached preferred embodiments as follows.

[0028] In the present invention, if it is determined that the detailed description of the technical configuration, known components, or known technology already described in the patent publication of prior art patent No. 10-1962904, invented by the inventor, may obscure the gist of the present invention, the detailed drawings and descriptions may be omitted. Furthermore, detailed descriptions of the previously described components and their functions may be omitted in subsequent descriptions.

[0029]

[0030] Example 1

[0031] Referring to FIG. 1, the present invention is configured such that external air is introduced into an air chamber (12) through an intake port (11) via an air filter (F) at the bottom of a gas (10), and the air in the air chamber (12) is supplied to a nitrogen oxide generating means (20).

[0032] The nitrogen oxide generating means (20) is provided with a motor fan (21) at the bottom as shown in FIGS. 1 and 2, and is configured so that air is blown in a straight direction into a long discharge chamber (23) of a cylindrical tube (22) having an open upper portion.

[0033] Meanwhile, to help understand the present invention, the wind blowing in a straight direction in a long discharge chamber (23) may be abbreviated as “straight wind.”

[0034] Accordingly, the present invention is configured such that a pair of elongated plate-shaped electrode members (24, 24') that receive positive and negative currents from a high-voltage current amplifier (25) are provided in a mutually opposing manner in the center of a long-shaped discharge chamber (23), and the upper ends (24a) of the pair of electrode members (24, 24') are respectively spread outward to form a V shape and are fixed to a supporting insulator (26). It is preferable that the supporting insulator (26) employ an insulator.

[0035] Accordingly, the supporting insulator (26) is fixed to the cylindrical tube (22) at the center of the lower part of the discharge chamber (23), so that it stands up in a V shape even when a pair of electrode members (24, 24') are separated from each other in the discharge chamber (23). In Fig. 2, reference numeral 27 represents a current supply member that supplies current to the high-voltage current amplifier (24), reference numeral 28 represents a high-voltage stabilizer, and reference numeral 29 represents a grounding member.

[0036] As shown in FIGS. 2 and 3, a pair of electrode members (24, 24') are configured such that a plurality of discharge embossing projections (24b) protrude from each electrode member (24, 24') and are fixed so that the discharge embossing projections (24b) protrude from each electrode member (24, 24') face each other. It is preferable that the electrode members (24, 24') are made of platinum or a platinum alloy having good electrical conductivity.

[0037] Accordingly, the present invention is provided in a discharge chamber (23) in which the upper ends (24a) of a pair of electrode members (24, 24') are each inclined outwardly to form a V shape, so that the passage through which the straight wind passes gradually becomes narrower as it goes upward from the lower end of the discharge chamber (23), and a bottleneck discharge section (23a) is provided in the upper part of the discharge chamber (23) toward the upper ends (24a) of the electrode members (24, 24').

[0038] In addition, as shown in FIGS. 2 and 3, by configuring a wind blocking portion (24c) that is further inclined and bent in an outward direction on the upper portion of a pair of electrode members (24, 24'), a narrower bottleneck discharge section (23a') can be provided on the upper portion of the bottleneck discharge section (23a) through which straight wind passes.

[0039] Accordingly, the present invention is such that when the straight wind inside the discharge chamber (23) hits the outer surface of a pair of electrode members (24, 24') as shown by the arrows in FIG. 2, the straight wind bends and gradually narrows the width through which the straight wind passes as it rises from the bottom to the top, so that it must pass through the bottleneck discharge section (23a, 23a'), and thus the air pressure inside the discharge chamber (23) becomes a high-pressure state in which the air pressure is relatively higher than the atmospheric pressure, and this high-pressure state is continuously maintained as long as the straight wind continues to blow into the discharge chamber (23).

[0040] To help understand the present invention, if the width or diameter of the outlet where the straight wind comes in is relatively narrower or narrower than the width or diameter of the inlet where the straight wind comes in, the air pressure increases due to the bottleneck phenomenon, resulting in a relatively high pressure state compared to the atmospheric pressure.

[0041] Accordingly, when a high-voltage current is supplied to a pair of electrode members (24, 24') provided in a high-voltage discharge chamber (23), an arc discharge occurs between the facing discharge embossments (24b) of the mutually opposing electrode members (24, 24'), and a discharge spark is generated. At this time, since the discharge spark is generated between numerous discharge embossments (24b), numerous discharge sparks are reliably generated, and Fig. 4 is a photograph showing a discharge spark state generated by the present invention through an experiment.

[0042] To help understand the present invention, in the case where straight flat electrode plates are discharged, as in the prior art patent No. 10-1962904 invented by the inventor of the present invention, the current is not concentrated at one point, so only a few discharge sparks are generated, but in the present invention, since the current is concentrated at the discharge embossing protrusions (24b), a large number of discharge sparks are generated in proportion to the number of discharge embossing protrusions (24b), and as a result, a large amount of plasma is generated, so that it is possible to generate plasma having a high concentration of nitrogen oxide.

[0043] Accordingly, the present invention, as shown in Fig. 1, includes a large amount of plasma having a high concentration of nitrogen oxide discharged to the return chamber (13) through the outlet (23b) of the discharge chamber (23), and then flows into the air chamber (12) through a plurality of return holes (14a) perforated in a perforated plate (14) provided on one side of a cylindrical tube (22), and then is blown back into the discharge chamber (23) of the cylindrical tube (22) through a motor fan (21), thereby mixing with the plasma having a high concentration of nitrogen oxide, thereby allowing the nitrogen oxide to be in an even higher concentration state.

[0044] In addition, it can be used to produce high-concentration nitrogen oxide activated water by sending it to a nanobubble machine (B) of a water tank (T), for example, through an intake pump (P) connected to an exhaust port (15) provided on the upper part of the return room (13).

[0045] Accordingly, the present invention can obtain plasma having a very high concentration of nitrogen oxide by continuously performing a circulation operation in which plasma air having nitrogen oxide in the return chamber (13) is supplied to the discharge chamber (23) by the motor fan (21) through the return chamber (14a) and the air chamber (12) by manipulating the control unit (17) to close the on-off valve (11a) provided in the intake port (11) and simultaneously stop the operation of the intake pump (16). In this case, the control unit (17) intermittently opens the on-off valve (11a) and simultaneously operates the intake pump (16), thereby supplying nitrogen oxide having a very high concentration to the water tank (T).

[0046]

[0047] Example 2

[0048] Referring to FIGS. 5 and 6, the present invention is configured such that a pair of electrode members (240, 240') are configured in the shape of an inverted cone so that the lower ends thereof are each fixed to a supporting insulator (260).

[0049] In addition, among a pair of electrode members (240, 240'), one electrode member (240') has a diameter that is relatively smaller than the diameter of the other electrode member (240), and the other electrode member (240') having a relatively smaller diameter is fixed to a supporting insulator (260) inside the electrode member (240) having a relatively larger diameter, so that a discharge chamber (23) is provided between the pair of electrode members (240, 240') through which a straight wind blows.

[0050] And referring to FIG. 6, among a pair of electrode members (240, 240'), the upper slope angle of the outer slope (240'a) of one electrode member (240) having a relatively larger diameter than the slope angle of the outer slope (240'a) of the other electrode member (240') having a relatively smaller diameter as shown by the virtual line in FIG. 6 can be configured to have a slope angle that is relatively more inclined toward one of the electrode members (240), thereby providing a bottleneck discharge section (23a) at the upper portion of the discharge chamber (23).

[0051] In addition, among a pair of electrode members (240, 240'), a plurality of mutually opposed discharge embossments (24b) are provided on the inner surface of one electrode member (240) having a relatively large diameter and on the outer surface of the other electrode member (240') having a relatively small diameter, so that a discharge spark is generated between the mutually opposed discharge embossments (24b).

[0052] In Fig. 6, symbol 27 represents a current supply member, and symbol 261 represents a wind inlet hole.

[0053] Accordingly, in the present invention, when the straight wind inside the discharge chamber (23) hits the outer surface of the electrode member (240') provided relatively inside as shown by the arrow in FIG. 6, the straight wind bends and gradually narrows the width through which the straight wind passes as it rises from the bottom to the top, so that it must pass through the bottleneck discharge section (23a), and thus the air pressure inside the discharge chamber (23) becomes a high-pressure state in which the air pressure is relatively higher than the atmospheric pressure, and this high-pressure state is continuously maintained as long as the straight wind continues to blow into the discharge chamber (23).

[0054] And, in the high-pressure discharge chamber (23), an arc discharge occurs between the facing discharge emboss projections (24b), and a discharge spark is generated. At this time, since the discharge spark is generated between numerous discharge emboss projections (24b), numerous discharge sparks are reliably generated.

[0055] Meanwhile, the present invention is configured so that the outer slanted surfaces (240a, 240'a) of a pair of electrode members (240, 240') are parallel as shown in solid lines in FIG. 6, so that the straight wind is momentarily blocked from moving as the outer slanted surface (240'a) of the electrode member (240') provided relatively on the inner side is bent when the straight wind hits it, while a strong straight wind continues to blow from the lower side, so that the pressure in the discharge chamber (23) rises.

[0056] And, among a pair of electrode members (240, 240'), a wind blocking portion (24c) that is inclined toward the electrode member (240) that is relatively outer is further provided on the upper portion of the electrode member (240') that is relatively inner, so that a bottleneck discharge section (23a') can be provided on the upper portion of the bottleneck discharge section (23a) through which straight wind passes, and as a result, the discharge chamber (23) is promoted to have a relatively higher pressure than the atmospheric pressure.

[0057]

[0058] Example 3

[0059] The same components as the nitrogen oxide generating means (20) described above in Fig. 7 and the description of the operation of the components are omitted and described.

[0060] Accordingly, the present invention can be provided with one or more discharge chambers (23), and an arc discharge can be generated by a pair of electrode members (24, 24') (240, 240') within the discharge chamber (23).

[0061] Accordingly, the present invention can be configured so that there is an inclined passage (23c) that bends the straight wind at the upper part of the discharge chamber (23), and a bottleneck wind passage (23d) having a relatively smaller diameter than the discharge chamber (23) is provided at the upper part of the inclined passage (23c).

[0062] Therefore, as the straight wind discharged through the outlet (23b) of the discharge chamber (23) collides with the inclined passage (23c), the straight wind bends and gradually narrows the width through which the straight wind passes as it rises from the bottom to the top, so that it must pass through the bottleneck wind passage (23d), and thus the air pressure inside the discharge chamber (23) increases relatively more than the atmospheric pressure, becoming a high-pressure state, and this high-pressure state is continuously maintained as long as the straight wind continues to blow into the discharge chamber (23).

[0063] And, by allowing the straight wind passing through the bottleneck wind passage (23a") to be exhausted to the exhaust port (15) through the U-shaped wind passage (19) centered on the bulkhead (18), the straight wind's passing speed is slowed down, so that the increased air pressure within the discharge chamber (23) does not drop and the increased air pressure is continuously maintained.

[0064] Meanwhile, the present invention may further include a vortex conversion means (30) provided at the bottom of the discharge chamber (23). The vortex conversion means (30) causes the straight wind blowing by the motor fan (21) to blow obliquely toward the inner surface of the discharge chamber (23), thereby causing a vortex to blow within the discharge chamber (23). Since the technical configuration has already been described in detail in the registered patent publication of Patent No. 10-1962904, which was previously registered by the inventor of the present invention, detailed drawings and descriptions thereof are omitted here.

[0065] Accordingly, when a whirlwind blows within the discharge chamber (23), the atmospheric pressure rises, and since the air pressure within the discharge chamber (23) also rises due to the wind through the bottleneck discharge section (23a, 23a') and the bottleneck wind passage (23d), the discharge chamber (23) is definitely in a high-pressure state that is relatively higher than the atmospheric pressure, and since numerous discharge sparks are generated by the arc discharge under these high-pressure conditions, it is possible to obtain high-concentration nitrogen oxide.

[0066] Accordingly, the present invention is not necessarily limited to what is shown and described in the drawings, and can be implemented in various forms by a person having ordinary skill in the art to which the present invention pertains, so it is obvious that it should be broadly protected as long as it does not significantly deviate from the scope of the claims.

[0067]

[0068] <Explanation of symbols>

[0069] 10: Gas 11: Intake

[0070] 11a: Opening / closing valve 12: Air chamber

[0071] 13: Return room 14: Perforated plate

[0072] 14a; return ball 15: exhaust port

[0073] 16: Intake pump 17: Control unit

[0074] 18: Bulkhead 19: U-shaped wind tunnel

[0075] 20: Nitrogen oxide generating means 21: Motor fan

[0076] 22: Cylinder 23: Discharge chamber

[0077] 23a, 23a': Bottleneck discharge section 23b: Exit

[0078] 23c: Inclined passage 23d: Bottleneck passage

[0079] 24,24',240,240': Electrode member 24a: Top

[0080] 24b: Discharge embossing 24c: Wind blocking part

[0081] 25: High voltage current amplifier 26,260: Supporting insulator

[0082] 27: Current supply element 28: High voltage stabilizer

[0083] 29: Grounding member 30: Tornado conversion means 0

[0084] 240a, 240'a: Outer slope 261: Wind inlet

[0085] F: Air filter T: Water tank

[0086] B: Nanobubble machine

[0087]

Claims

1. The external air supplied to the air chamber (12) provided at the bottom of the body (10) is configured to blow a straight wind upward from the bottom of the elongated discharge chamber (23) by the motor fan (21); In the above discharge chamber (23), a plurality of long electrode members (24, 24') (240, 240') each supplied with a high-voltage current are provided, and a discharge spark is generated between the facing discharge embossing protrusions (24b). A high-concentration nitrogen oxide generator in which a discharge chamber (23) in which a straight wind blows is provided with a bottleneck discharge section (23a) having a narrow wind passage width at the upper part of the discharge chamber (23) so that the air pressure in the discharge chamber (23) in which a straight wind blows is relatively higher than the atmospheric pressure, and in which a large amount of plasma having a high concentration of nitrogen oxide is generated by increasing the air pressure even when a straight wind blows in the discharge chamber in which a thunderbolt discharge is performed.

2. In paragraph 1, A high-concentration nitrogen oxide generator in which a discharge chamber (23) is provided inside a cylindrical tube (22), and a pair of long plate-shaped electrode members (24, 24') are fixed in a V shape to a supporting insulator (26) provided at the bottom of the discharge chamber (23) so that a bottleneck discharge section (23a) with a narrow wind path width is provided at the top of the discharge chamber (23). The device is characterized in that even if a straight wind blows in the discharge chamber where the thunderbolt discharge is performed, the air pressure increases and a large amount of plasma with high concentration nitrogen oxide is generated.

3. In paragraph 2, A high-concentration nitrogen oxide generator characterized in that a wind blocking portion (24c) that is inclined toward a cylindrical tube (22) is further provided at the upper end of the pair of electrode members (24, 24') to have a bottleneck discharge section (23a'), in which a discharge chamber where a thunderbolt discharge is performed is configured so that the air pressure increases and a large amount of plasma having high concentration nitrogen oxide is generated even when a straight wind blows.

4. In paragraph 1, The above pair of electrode members (240, 240') are configured in the shape of an inverted cone so that the lower ends are each fixed to a supporting insulator (260); Among the above pair of electrode members (240, 240'), one electrode member (240') has a diameter that is relatively smaller than the diameter of the other electrode member (240), and the other electrode member (240') having a relatively smaller diameter is fixed inside the electrode member (240) having a relatively larger diameter, so that a discharge room (23) in which a straight wind blows is provided between the pair of electrode members (240, 240'); The outer sloping surface (240'a) of one electrode member (240) having a relatively larger diameter among the above pair of electrode members (240, 240') is configured such that the upper part of the outer sloping surface (240'a) of one electrode member (240) having a relatively smaller diameter has a slope angle that is relatively more inclined toward one of the electrode members (240) than the slope angle of the other electrode member (240); and a bottleneck discharge section (23a) is provided at the upper part of the discharge chamber (23). A high-concentration nitrogen oxide generator in which a thunderbolt discharge is performed, characterized in that the inner surface of one electrode member (240) having a relatively large diameter among the above-mentioned pair of electrode members (240, 240') and the outer surface of the other electrode member (240') having a relatively small diameter are provided with a plurality of mutually opposed discharge emboss protrusions (24b), so that a discharge spark is generated between the mutually opposed discharge emboss protrusions (24b), and a large amount of plasma having a high concentration of nitrogen oxide is generated by increasing the air pressure even when a straight wind blows in the discharge chamber.

5. In paragraph 4, A high-concentration nitrogen oxide generator in which a discharge chamber where a thunderbolt discharge is performed is configured such that the outer sloping surfaces (240a, 240'a) of the pair of electrode members (240, 240') are configured to be parallel so that a straight wind hits the outer sloping surface (240'a) of the electrode member (240') provided relatively on the inner side and bends, thereby increasing the air pressure in the discharge chamber (23).

6. In either of paragraphs 4 and 5, A high-concentration nitrogen oxide generator in which a discharge chamber where a thunderbolt discharge is performed is characterized in that the upper portion of the electrode member (240') provided relatively inwardly among the pair of electrode members (240, 240') is further provided with a wind blocking portion (24c) that is inclined in the direction of the electrode member (240) provided relatively outwardly, so as to have a bottleneck discharge section (23a'). The device is configured such that even when a straight wind blows in the discharge chamber, the air pressure increases and a large amount of plasma having a high concentration of nitrogen oxide is generated.

7. In paragraph 1, A high-concentration nitrogen oxide generator in which a discharge chamber in which a thunderbolt discharge is performed is characterized in that the discharge chamber has an inclined passage (23c) that causes a straight wind to bend in the upper part of the discharge chamber (23), and a bottleneck wind passage (23d) having a relatively smaller diameter than the discharge chamber (23) is provided in the upper part of the inclined passage (23c). The device is configured such that even when a straight wind blows in the discharge chamber, the pressure increases and a large amount of plasma having a high concentration of nitrogen oxide is generated.

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