JP2003158996A - Apparatus for decomposing organic gas by dark plasma, and apparatus for keeping freshness of farm product by using the apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact apparatus drived by a low voltage, decomposing harmful organic gas used for keeping of freshness such as ethylene gas, and capable of simultaneously killing putrefactive bacteria floating in a container without generating ozone. <P>SOLUTION: A central energized electrode 2 is stood at the center position on the surface 1a of an electrode-arranging plate 1. Many floating electrodes 3 not connected to current-carrying bodies are stood at a nearly prescribed interval on the positions at a prescribed distance from the central electrode 2 so as to surround the electrode 2. Many outer periphery energized electrodes 4 connected to the current- carrying bodies are stood at an interval at the outer periphery of the floating electrodes 3 so as to surround the group of the floating electrodes 3. The central energized electrode 2 and the outer periphery energized electrodes 4 are connected to a power source 5 for impressing a voltage having an intensity for generating only the dark plasma under atmosphere in the organic gas-decomposing apparatus. The organic gas-decomposing apparatus also has a blowing means 6 for blowing the organic gas to the space among each electrode 2, 3, 4 on the surface 1a of the electrode- arranging plate 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for efficiently generating dark plasma under atmospheric pressure, and using the device, organic gas for fresh agricultural products such as ethylene gas released by agricultural products is stored in a container. Dark plasma generated by low voltage current with low power consumption and low power consumption decomposes into carbon and oxygen or water to make it harmless, and the sterilizing action of the dark plasma maintains the freshness of stored fresh produce for a long time. A device for enabling.

[0002]

2. Description of the Related Art Various kinds of bacteria adhere to fresh agricultural products, and if left unattended, they may cause deterioration in freshness and spoilage. In order to prevent this, it is common practice to store fresh agricultural products in a refrigerator. When put in the refrigerator, the low temperature suppresses the growth of spoilage bacteria and thus prevents spoilage. However, the deterioration of freshness cannot be prevented by harmful organic gas such as ethylene gas released from the agricultural products. Therefore, in order to maintain the freshness of fresh agricultural products for a long period of time, it is necessary to treat harmful organic gases such as ethylene gas released from the agricultural products as quickly as possible. However, if the generated ethylene gas is to be exhausted to the outside, air that has cooled to a low temperature will also be exhausted, and the replaced outside air is newly cooled, resulting in an increase in energy consumption.

Therefore, in general, a gas adsorbent such as activated carbon for adsorbing and removing such harmful organic gas is widely used. In this method, the adsorption performance deteriorates with continued use, so the activated carbon must be replaced with new one as appropriate. Moreover, the management of this is very troublesome. Further, since activated carbon is sold as a product in a plastic container or the like, disposal of used carbon in the waste area may cause environmental problems.

Therefore, when a high voltage is applied to the electrodes, an arc discharge or a spark discharge is caused to generate bright plasma, and at the same time, ozone is also generated as shown in FIG. A method has been proposed in which various bacteria attached to fresh produce are killed to eliminate the cause of decay. In this method, plasma emission and heat generation occur due to the application of a high-voltage current, and there is a problem that the temperature inside the freezer or the refrigerator to be cooled rises conversely. Further, the use of a high voltage current requires a large-scale device and a large amount of power consumption, which causes a problem that the maintenance cost of the device becomes a heavy burden.

Further, ozone not only sterilizes spoilage bacteria, but also causes decolorization change of foods and makes foods unattractive, and if a large amount thereof is generated, it may adversely affect the human body. Therefore, it is not preferable to use this device as it is as a storage of fresh agricultural products for home use.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an organic gas harmful to freshness preservation such as ethylene gas generated from fresh agricultural products accumulated in a storage container. , A compact device that can sterilize spoilage bacteria floating in the container without generating ozone at the same time, and that device can be used to maintain the freshness of the fresh produce in the container for a long period of time. (EN) Provided is a small-sized, low-power device which is safe and suitable for general household use, and which is a freshness-keeping device for fresh produce.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a central energizing electrode 2 is erected at a central portion on a surface 1a of an electrode disposing plate 1 and is fixed from the central energizing electrode 2. A large number of floating electrodes 3 which are not connected to the current-carrying body are provided upright at substantially equal intervals around the space, and a large number of peripheral current-carrying electrodes connected to the current-carrying body at intervals around the floating electrode group so as to surround the floating electrode group. 4 is set up. The central conducting electrode 2 and the outer conducting electrode 4
Is connected to a power source 5 for applying a voltage having a strength to generate only dark plasma under atmospheric pressure, and a blowing means 6 for blowing an organic gas between each of the electrodes 2, 3 and 4 on the surface 1a of the electrode arrangement plate 1. It is equipped with. Then, the organic gas decomposing apparatus by dark plasma is characterized in that the organic gas blown onto the electrode group can be decomposed by the dark plasma generated in the electrode group when a voltage is applied.

Further, in the above structure, the central conducting electrode 2, the floating electrode 3, and the outer peripheral conducting electrode 4 are rod-shaped bodies having a large-diameter discharge portion 11 formed at the tip.

Further, in the above structure, the plurality of outer peripheral energization electrodes 4 are arranged at an equal distance from the central energization electrode 2.

Furthermore, in the above-mentioned structure, the power source 5 is a pulse voltage power source.

In the above structure, the pulse voltage is a low voltage pulse voltage of about 3.6 kHz with a frequency of about 5 kHz.

Further, in the above structure, the electrode arrangement plate 1 is mounted on the case 7 so as to partition the internal space S thereof, and the intake port 8 is made to face the partition space S1 on the surface 1a side of the electrode arrangement plate 1. The partition space S2 on the rear surface 1b side
A plurality of ventilation holes 10 communicating with both side spaces S1 and S2 are provided in the outer peripheral portion of the electrode arrangement plate 1 with respect to the outer peripheral energization electrode 6, and the intake port 8 is centrally energized. A blowing nozzle 15 that opens toward the electrode 2 is attached, and a blower 6 is attached to the intake port 8 or the exhaust port 9 side.

Further, in the above structure, the organic gas decomposing device using the dark plasma is installed in the storage space A of the storage container 12 for fresh agricultural products, and the storage space A generated from the fresh agricultural products which is one of the causes of the deterioration of freshness is installed. The apparatus for maintaining freshness of fresh agricultural products is characterized in that the organic gas is sprayed onto the electrode group and decomposed by the action of dark plasma so that the freshness of the stored fresh agricultural products can be maintained for a long period of time.

Further, in the above structure, the intake port 8 and the exhaust port 9 of the organic gas decomposing apparatus using the dark plasma are opened in the storage space A of the storage container 12 for fresh agricultural products, which is one of the causes of the deterioration of freshness. The organic gas in the storage space A generated from fresh produce is sprayed on the electrode group and decomposed by the action of dark plasma so that the freshness of the stored fresh produce can be maintained for a long period of time. It is a freshness preservation device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A conventional apparatus using bright plasma of arc discharge or spark discharge, which has been proposed to maintain the freshness of fresh agricultural products, is easy to use because it can be easily carried out under atmospheric pressure. However, on the other hand, there is a problem that power consumption is large because ozone is generated and a high voltage current is used.

Therefore, the inventor of the present application paid attention to dark plasma generated at a low voltage. Dark plasma that does not emit light is usually generated in vacuum by applying a voltage considerably lower than the voltage generating bright plasma. However, it was difficult to generate efficiently under atmospheric pressure. Therefore, we have been able to complete an organic gas decomposition system using dark plasma by repeating research and experiments so that dark plasma can be used even under atmospheric pressure.

The form of the apparatus will be described in detail below. As shown in (a) and (b) of FIG. 3 and FIG. 4, this device has a center current-carrying electrode 2 standing upright at a central portion on a surface 1a of a circular electrode arrangement plate 1 and then having a substantially constant interval. A large number of floating electrodes 3 which are not connected to the current-carrying body are erected at substantially equal intervals around the surroundings. A large number of outer peripheral energization electrodes 4 connected to an electric conductor are provided upright at regular intervals on the outer periphery so as to surround the floating electrode group.

Further, the shape of each of the electrodes 2, 3 and 4 is optimally a rod-shaped body having a large-diameter discharge portion 11 formed at the tip for increasing the discharge capacity, as shown in FIG. is there.

In the conventional electrode discharge, the discharge voltage was applied between the two electrodes and could not be applied unless it was at least 1: 1. And it was efficient to have a plurality of discharge electrodes in order to discharge as much as possible. However, if a large number of conducting bipolar electrodes are used, a large amount of electric power will be consumed. In addition, when a current is applied between a plurality of electrode groups, discharge tends to occur intensively between electrodes that are closest to each other with different polarities, which tends to cause uneven discharge. It is necessary to avoid being in a state of being close to each other and to provide each electrode at equal intervals as much as possible.

In the present invention, by adopting the above-described structure having the floating electrode 3 group, it is possible to efficiently obtain a large amount of dark plasma under atmospheric pressure using a pulse voltage or the like even at a relatively low voltage. It was devised to be.

Then, the central conducting electrode 2 and the peripheral conducting electrode 4 are connected to a power source 5 for applying a voltage having a strength for generating only dark plasma under atmospheric pressure. Further, as shown in FIGS. 1 and 2, a blowing nozzle 15 for blowing an organic gas between the electrode groups on the surface 1a of the electrode arrangement plate 1 and a blowing means 6 such as a blowing fan are attached.

As a result, an organic gas decomposing device using dark plasma capable of decomposing harmful organic gas generated from fresh agricultural products such as ethylene, ammonia and methane sprayed on the dark plasma generated in the electrode group by applying a voltage is provided. Composed.

The optimum voltage for generating only dark plasma under atmospheric pressure between the central energizing electrode 2 and the outer energizing electrode 4 varies depending on the scale, and in order to save power consumption, the application of the voltage may be continuous or intermittent. Good to continue.

[0024]

[Embodiment 1] Next, one concrete embodiment of an organic gas decomposing apparatus using dark plasma will be shown. As shown in FIG.
As shown in FIG. 4, a rod-shaped body having a large-diameter discharge portion 11 for increasing the discharge capacity at its tip is used. As shown in FIG. 4, a plurality of floating electrodes 3, a plurality of outer peripheral conducting electrodes 4 and one central conducting electrode 2 are provided. A total of 21 electrode needles are used. The total length of the electrode needle is 20 mm, about half of which has a diameter of 3 mm at the base end.
mm, the diameter of the large-diameter discharge part 11 at the tip is formed by connecting different diameters of 5 mm, and these electrodes are arranged in a circular electrode with a space of about 0.5 mm between the large-diameter discharge parts 11. Board 1
A large number of them are fixed upright on the surface 1a of.

As shown in FIG. 4B, when the plurality of outer peripheral energizing electrodes 4 are equidistant from the central energizing electrode 2, a large dark plasma generation efficiency can be obtained under certain conditions. However, when there are changes in external conditions such as temperature and atmospheric pressure, as shown in (a) of FIG. Having them is advantageous in that the range in which dark plasma can be generated is large.

Then, as shown in FIG. 1, the central energizing electrode 2 such as a wire is applied to a power source 5 for applying a voltage having a strength for generating only dark plasma under atmospheric pressure to the central energizing electrode 2 and the outer peripheral energizing electrode 4. Are electrically connected to each other by means of a current-carrying body 13 to the outer peripheral current-carrying electrode 4, a current-carrying body 14a connecting the peripheral current-carrying electrodes 4 to each other. Also, the surface 1a of the electrode arrangement plate 1
The blowing means 6 with the blowing nozzle 15 for blowing the organic gas between the electrode groups is mounted.

[0027]

Example 2 The organic gas decomposing apparatus using dark plasma as shown in FIG. 1 has a form in which the surface 1a of the electrode arrangement plate 1 is exposed to the outside space. As shown, it is possible to have a form housed in the case 7.
In this embodiment, as shown in FIG. 2, an electrode arrangement plate 1 using 21 electrodes each having the same shape and size as those of the first embodiment is attached to the case 7 so as to partition the internal space S thereof.

An inlet port 8 is provided so as to face the partition space S1 on the front surface 1a side of the electrode arrangement plate 1, and an exhaust port 9 is provided so as to face the partition space S2 on the back surface 1b side. The space S on both sides of the electrode placement plate 1 is located on the outer periphery of the outer periphery energizing electrode 4 than the outer periphery energization electrode 4.
1, a plurality of ventilation holes 10 communicating with S2 are provided, and a blowing nozzle 15 that opens toward the central energizing electrode 2 is attached to the intake port 8 so that air can flow through the electrode group. A ventilation pipe 16 on the side of the intake port 8 or the exhaust port 9
An air blower 6 such as an air pump is attached via the.

[0029]

[Embodiment 3] As shown in the schematic view of FIG. 5, the freshness-preserving apparatus for fresh agricultural products using the organic gas decomposing apparatus by the dark plasma is the same as the apparatus of Example 1, except that the storage space for the fresh agricultural products storage container 12 is used. It can be installed in A.

[0030]

Fourth Embodiment As another embodiment, as shown in FIG. 6, the intake port 8 and the exhaust port 9 of the organic gas decomposing apparatus using dark plasma of the second embodiment are replaced with a container 12 for storing fresh agricultural products.
It is possible to open it in the storage space A.

[0031]

[Embodiment 5] As another embodiment, as shown in FIG. 7, the organic gas decomposing apparatus using dark plasma of Embodiment 2 is attached to the outside of the storage container 12 for fresh agricultural products, and the storage space A of the storage container 12 is attached. An intake port 8 and an exhaust port 9 are opened inside.

In each of Examples 3, 4 and 5, the organic gas such as ethylene, ammonia and methane in the storage space A generated from fresh agricultural products such as vegetables and fruits, which is a cause of the deterioration of freshness, is an organic gas due to dark plasma. It is sucked into the decomposition device, and is decomposed into oxygen, carbon dioxide, carbon, and water by the action of dark plasma that is sprayed on the electrode group and is generated in a large amount, and is discharged into the storage space A. In this way, the ethylene gas that causes deterioration of freshness is decomposed and the concentration is not increased, and as a result, the freshness of the stored fresh agricultural products can be maintained for a long period of time. At that time, storage space A
The outside air is not taken into and the temperature is maintained as it is.

[0033]

[Test Example 1] Under the following test conditions, a test for examining the temporal change in the concentration of ethylene gas was conducted with the apparatus of Example 2 by using three types of pulse voltages.

<Test conditions> Container capacity: 90 liters Ethylene gas: 500ppm included ● mark: voltage off △ pulse voltage: 50Hz ○ pulse voltage: 500Hz □ pulse voltage: 5000Hz = 5kHz Electrode spacing: 0.5 mm Voltage applied to electrodes: Constant at 3.6kV Barometric pressure: atmospheric pressure

FIG. 8 is a graph showing the test results. Then, the concentration of ethylene gas was measured every 10 minutes. As shown in this graph, the higher the frequency of the pulse voltage, the more the concentration of ethylene gas decreases, and
A large effect could be confirmed at the frequency of kHz.

[0036]

Test Example 2 Next, in the same manner as in the above-mentioned Experimental Example 1, using the apparatus of Example 2, 8.64 kg of banana was put in a 90-liter container, and a test for examining the time-dependent change in the concentration of ethylene gas was conducted.

<Test conditions> Container capacity: 90 liters Pulse voltage: 5000Hz = 5kHz Electrode spacing: 0.5 mm Voltage applied to electrodes: Constant at 3.6kV Barometric pressure: atmospheric pressure

FIG. 9 is a graph showing the results of this test and shows the change over time in the concentration of ethylene gas generated from blue bananas. Initially, the concentration of ethylene gas was 25 ppm, but then gradually increased, and after 180 hours, the amount of ethylene gas generated started to increase. After 256 hours, when the switch was turned on to start the discharge, the concentration rapidly decreased, and after 261 hours, when the switch was turned off to stop the discharge, the concentration of ethylene gas started to increase again. This clearly shows that the ethylene gas in the container was decomposed and disappeared by the action of dark plasma.

FIG. 10 shows 256 of the graph of the above test.
It is an enlarged view after the lapse of time, and it can be seen that after 256 hours, when the switch was turned on and the discharge was started, the concentration of 230 ppm at that time was gradually decreased, and it became 200 ppm after 261 hours. Then, when the switch was turned off and the discharge was stopped, the concentration of ethylene gas suddenly started to increase again.

[0040]

[Test Example 3] Further, in the apparatus of Example 2, a test was conducted under the following test conditions, in which 8.64 kg of bananas were put in and the temporal change of the concentration of ethylene gas in a short time was conducted. It was

<Test conditions> Container capacity: 90 liters Pulse voltage: 5000Hz = 5kHz Electrode spacing: 0.5 mm Voltage applied to electrodes: Constant at 3.6kV Barometric pressure: atmospheric pressure

FIG. 11 is a graph showing the results of this test, and shows the change over time in the concentration of ethylene gas generated from a blue banana. The concentration of ethylene gas gradually increased until the first 2 hours, and after 2 hours, when the switch was turned on and the discharge started, the concentration stopped increasing and the concentration increased from 300 ppm to 310 pp.
When the discharge was stopped by turning off the switch after 7 hours, the ethylene gas concentration suddenly increased again. This is due to the action of dark plasma,
It shows that the ethylene gas generated from the banana in the container was decomposed and continued to disappear.

Although the concentration of ozone was measured at the same time as the ethylene gas in the container, the presence of ozone was not recognized in any of Test Examples 1 to 3 above.

[0044]

TEST EXAMPLE 4 Using the dark plasma organic gas decomposing apparatus of Example 2, a test was conducted as to the influence of the frequency and voltage on the ethylene gas when the power source 5 was a pulse voltage power source. This is 10 put ethylene gas in a container.
This is the result of examining the change in the concentration for each minute.

[0045] Container capacity: 90 liters ▲ pulse voltage: 50Hz ● Pulse voltage: 500Hz Pulse voltage marked with ■: 5000Hz = 5kHz Electrode spacing: 0.5 mm Voltage applied to electrodes: 0-4kV, constant Barometric pressure: atmospheric pressure Temperature: 24 ℃ Humidity: 49%

The results are shown in the graph of FIG. In this test, the pulse voltage is 5 kHz and the frequency is 1 to 3 kV.
It can be seen that the gas concentration of 7 ppm was close to 0, and the effect of decomposing ethylene gas was remarkable. 50
There is almost no reduction at Hz, and 3 at 500 Hz.
The concentration decreases to the order of kV. Further, at a voltage of 4 kV or higher, it is confirmed that spark discharge occurs and ozone is generated, which is not preferable.

Therefore, in the device of the second embodiment, in order to obtain a high effect at a low voltage, the pulse voltage is 5 kHz,
It can be seen that when the voltage applied to the electrodes is 3.6 kV, the ethylene gas is reduced most and the decomposition effect of the gas is great.
It has also been confirmed that when the frequency is increased above 5 kHz, the higher the voltage, the lower the decomposition amount of ethylene gas. The optimum voltage for generating the dark plasma varies depending on the scale of the organic gas decomposing apparatus using the dark plasma, but in the present invention, it is possible to efficiently generate the dark plasma at a voltage significantly lower than that in the case of generating the conventional bright plasma. . Further, when the voltage is considerably lower than this, discharge plasma is generated without generating dark plasma, but the decomposition or sterilization effect of the organic gas cannot be expected with these ions.

[0048]

[Test Example 5] A test was conducted to examine the effect of dark plasma generated by the apparatus of Example 1 on the fungus.
This is to examine the increase / decrease state of the number of spores of a bacterium that can be collected in a petri dish when the bacterium is put in and circulated in the air by the experimental apparatus shown in FIG.

[0049] Pulse voltage: 5kHz Voltage applied to electrodes: Constant at 3.6kV Barometric pressure: atmospheric pressure

FIG. 14 is a graph showing the results of this test. When the spores pass through the dark plasma due to air circulation, molecules such as proteins constituting the spores are decomposed (burnt) and the time elapses. It was confirmed that the number of deaths decreased.

[0051]

[Comparative Test Example 1] In order to compare with the present invention, a test was conducted to examine the temporal changes in the concentrations of ethylene gas and ozone due to conventional spark discharge.

<Test conditions> Container capacity: 90 liters Pulse voltage: 5000Hz = 5kHz Electrode spacing: 0.5 mm Voltage applied to electrode: constant at 26 kV Barometric pressure: atmospheric pressure

FIG. 15 is a graph showing the results of this test, showing the changes over time in the concentrations of ethylene gas and ozone in the container. This test shows that a spark discharge at a high voltage of 26 kV decomposes the ethylene gas in the container, and at the same time, a large amount of ozone harmful to the human body is generated.

[0054]

In the conventional method of maintaining freshness by electric discharge and its apparatus, plasma emission and heat generation are caused by application of a high voltage current, and an organic gas harmful to freshness maintenance such as ethylene is decomposed by the action of bright plasma. On the other hand, the temperature inside the freezer or refrigerator to be cooled rises conversely, and the use of high-voltage current causes heavy and large-scale equipment and power consumption to increase, resulting in high maintenance costs. Ozone generated in a large amount has a bactericidal action and is useful, but it has a bad effect on the human body, and ozone has a problem of causing decolorization change of foods.

On the other hand, as described above, in the apparatus for decomposing organic gas by dark plasma of the present invention, the floating electrodes 3 are arranged around the central conducting electrode 2.
The outer peripheral energizing electrodes 4 are arranged so as to surround them and can be made extremely compact, and as shown in the results of each of the above tests, it is possible to effectively generate a large amount of dark plasma at a low voltage even under atmospheric pressure. Is now possible.

Further, by utilizing the device,
The freshness preservation device for fresh produce can be made to have a low voltage, which can reduce power consumption and size, and as shown in the above test example, fresh produce accumulated in the storage container 12 It has become possible to decompose organic gases such as ethylene, ammonia and methane, which are harmful to freshness preservation, into harmless oxygen, carbon dioxide, carbon and water by the action of dark plasma.

Dark plasma also has a strong chemical action capable of decomposing ethylene gas, so that it can be used against spoilage bacteria.
As shown in the test results of 4, the living tissue of the fungus is destroyed and killed. Then, the spoilage bacteria floating in the storage space A are sterilized to eliminate the cause of the spoilage, and the freshness of the fresh agricultural products in the storage container 12 can be maintained for a long period of time. The above changes will not occur. In addition, not generating ozone at all does not cause a unique ozone odor.

Therefore, the freshness-retaining device for fresh agricultural products according to the present invention can be used as an extremely compact, safe and economical refrigerator or storage suitable for general household use.

[Brief description of drawings]

FIG. 1 is a schematic conceptual diagram of an organic gas decomposing apparatus using dark plasma according to the present invention.

FIG. 2 is an organic gas decomposing apparatus using a dark plasma having a case.

FIG. 3 is a perspective view of a main part showing the shape and arrangement of electrodes.

FIG. 4 shows the surface of the electrode arrangement plate, where (a) is the front surface when the outer peripheral energization electrode is not equidistant from the center energizing electrode and (b) is each front surface when the outer periphery energizing electrode is equidistant from the center energizing electrode. Fig.

FIG. 5 is a schematic conceptual diagram of a freshness preservation device for fresh agricultural products.

FIG. 6 is a schematic conceptual view of a freshness preservation device for a fresh agricultural product in another form.

FIG. 7 is a schematic conceptual view of a freshness-maintaining device for a fresh agricultural product in another form.

FIG. 8 is a graph showing a change in ethylene gas concentration with frequency.

FIG. 9 is a graph showing changes in ethylene gas concentration during discharge and during discharge stop.

FIG. 10 is a graph showing a state in which FIG. 9 is partially enlarged.

FIG. 11 is a graph showing changes in the concentration of ethylene gas with time.

FIG. 12 is a graph showing changes in ethylene gas concentration depending on voltage and frequency.

FIG. 13 is a schematic vertical cross-sectional side view of an apparatus for investigating the reduction state of fungal spores due to dark plasma.

FIG. 14 is a graph showing the results of examining the reduction state of spores of bacteria caused by dark plasma in the apparatus shown in FIG.

FIG. 15 is a graph showing changes in concentration of ethylene gas and ozone due to conventional spark discharge.

[Explanation of symbols]

1 Electrode placement plate 1a Surface of electrode placement plate 2 Center energizing electrode 3 floating electrodes 4 outer circumference energizing electrode 5 power supplies 6 Blower means 7 cases 8 air intake 9 exhaust port 10 ventilation holes 11 Large diameter discharge part 12 storage containers 13 Conductor 14 Conductor 14a Conductor 15 Spray nozzle 16 air duct A storage space S1 partition space S2 partition space

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Nagasawa             1728-49, Omata Town, Ashikaga City, Tochigi Prefecture (72) Inventor Yasushi Nishida             353-21 Takeshitacho, Utsunomiya City, Tochigi Prefecture (72) Inventor Kenichi Iwasaki             Tochigi Prefecture Utsunomiya City Takaragihoncho 1474 5 Stock Association             Inside the company F-term (reference) 4B069 KA01 KA03 KA05 KA10 KB10                       KC01                 4G075 AA03 AA37 AA62 BA05 BD12                       CA47 EB41 EC21

Claims (8)

[Claims] 1. A central conducting electrode (2) is provided upright at a central portion on a surface (1a) of an electrode arrangement plate (1), and a conducting body is provided around the central conducting electrode (2) at a constant interval. A large number of floating electrodes (3) which are not connected to each other are erected at substantially equal intervals, and a large number of outer peripheral energizing electrodes (4) connected to the current-carrying members are erected at intervals on the outer periphery so as to surround the floating electrode group. Then, the central energization electrode (2) and the outer periphery energization electrode (4) are connected to a power source (5) that applies a voltage of a strength that generates only dark plasma under atmospheric pressure, and the electrode arrangement plate (1) Surface (1a)
Of the electrodes (2), (3), and (4) of (1) are provided with a blowing means (6) for blowing an organic gas, and the organic gas blown by the dark plasma generated in the electrode group by voltage application An organic gas decomposing device using dark plasma, which is characterized in that it can be decomposed. 2. A central conducting electrode (2), a floating electrode (3),
The organic gas decomposing apparatus by dark plasma according to claim 1, wherein the outer circumference energizing electrode (4) is a rod-shaped body having a large-diameter discharge portion (11) formed at the tip. 3. A plurality of outer peripheral energizing electrodes (4) are arranged equidistant from the central energizing electrode (2).
An apparatus for decomposing organic gas by dark plasma according to 1. 4. The apparatus for decomposing organic gas by dark plasma according to claim 1, wherein the power source (5) is a pulse voltage power source. 5. The pulse voltage has a frequency of about 5 kHz,
The apparatus for decomposing organic gas by dark plasma according to claim 4, wherein the pulse voltage is a low voltage of about 3.6 kV. 6. An electrode placement plate (1) is attached to a case (7) so as to partition the internal space (S) thereof, and the electrode placement plate (1) is placed in the partition space (S1) on the surface (1a) side. It has an intake port (8) facing it, and an exhaust port (9) facing the partition space (S2) on the back surface (1b) side, and the outer peripheral electrification electrode (6) of the electrode arrangement plate (1). A plurality of ventilation holes (10) communicating with both side spaces (S1) and (S2) are provided in the outer peripheral portion of the air intake port (8), and a spray nozzle (8) is opened in the intake port (8) toward the central conducting electrode (2). 15) The organic gas decomposition by dark plasma according to any one of claims 1 to 5, which is equipped with a blowing means (6) on the side of the intake port (8) or the exhaust port (9). apparatus. 7. An apparatus for decomposing an organic gas by dark plasma according to any one of claims 1 to 6 is mounted in a storage space (A) of a storage container (12) for fresh agricultural products,
The organic gas in the storage space (A) generated from fresh produce, which is one of the causes of the freshness reduction, is sprayed on the electrode group and decomposed by the action of dark plasma so that the freshness of the stored fresh produce can be maintained for a long time. A freshness preservation device for fresh agricultural products characterized by the above. 8. An inlet (8) and an outlet (9) of the apparatus for decomposing organic gas by dark plasma according to claim 6,
An opening is made in the storage space (A) of the storage container (12) for the fresh agricultural products, and the organic gas in the storage space (A) generated from the fresh agricultural products, which is one of the causes of the deterioration of freshness, is blown to the electrode group to act as a dark plasma. A freshness-retaining device for fresh agricultural products, characterized by being decomposed by means of which the freshness of the stored fresh agricultural products can be retained for a long period of time.