Air cleaning system and protective clothing

Abstract

An air cleaning system (1) has a linear electrode (20) that generates electromagnetic resonance, an electric field probe (40) that measures the intensity of an electric field, and a control unit (70) that controls the power supplied to the linear electrode (20). The control unit (70) operates the frequency of the power supplied to the linear electrode (20) and the position at which the power is supplied to the linear electrode (20) to control the output value of a signal representing the intensity of the electric field to be maximum. The amount of generated ozone is monitored, and the control unit (70) operates in a manner to modulate the amplitude of the supplied power to perform feedback control so that the amount of ozone is always fixed, so that ozone that gives energy above the dissociation energy of oxygen molecules and below the dissociation energy of nitrogen molecules to gas molecules contained in the gas flowing in to decompose viruses is generated but harmful nitrogen oxides are not generated.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an air cleaning system, and a protective suit using the air cleaning system. BACKGROUND

[0002] In the past, for exhaust gas from an internal combustion engine or the like, a treatment device using high voltage plasma in atmospheric pressure has been proposed for oxidation treatment of NO.

[0003] In the case where a transformer for voltage conversion, which is commonly used in a lower frequency band of 10 MHz or less, is used for generation of high voltage plasma, in a high frequency of 100 MHz or more, it is necessary to reduce the inductance (reactance). Therefore, there are problems that the number of turns of the coil and the size of the coil must be reduced, and the diameter of the coil used as an electric wire is also made thin, so that a large electric power cannot be supplied.

[0004] On the other hand, in the case where the voltage is raised in a state where the characteristic impedance is kept low, for example, 50 Ω or the like, without performing the above voltage conversion, for example, 10 kW (= 1000 2 / 2) of electric power is required for a voltage of 1000 V. It is actually difficult to provide a power supply device that supplies such an electric power.

[0005] Therefore, in Non-Patent Document 1, a plasma reactor in which a high voltage pulse having a peak voltage of 5000 to 10000 V is applied to electrodes at a frequency of several kHz so that plasma is generated between the electrodes for oxidation of NO in exhaust gas from an internal combustion engine or the like is proposed.

[0006] PRIOR ART DOCUMENTS

[0007] NON-PATENT DOCUMENTS

[0008] Non-Patent Document 1: "Complete removal technology of nitrogen oxides using non-equilibrium plasma and chemical reaction process (performance comparison of conventional and barrier type plasma reactors)", i.e., "Complete removal technology of nitrogen oxides using non-equilibrium plasma and chemical reaction process (performance comparison of conventional and barrier type plasma reactors)", Transactions of the Japan Society of Mechanical Engineers 66-646B, 1501-1506 (2000) SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, as a plasma reactor, in the conventional air cleaning system, there is a problem that the signal of the applied pulse voltage is not sufficiently supplied with power due to impedance mismatch. Furthermore, in the high voltage pulse of several kHz, the time between the high voltage pulses is longer than the discharge time based on the high voltage pulse. At this time, since the electrons ionized from the gas recombine, a great amount of energy needs to be supplied to ionize the electrons every time the high voltage pulse is applied, becoming a device with low power efficiency. Therefore, even if plasma is generated, the amount of bacteria and viruses in the air that are decomposed by the plasma is lower compared to the input power.

[0011] Furthermore, in the conventional air cleaning system, not only the dissociation of oxygen molecules due to the strong electric field corresponding to the peak of the pulse but also the dissociation of nitrogen molecules and nitrogen oxides generated due to the dissociation of nitrogen molecules are difficult to reduce. Furthermore, ozone is generated, but it is also difficult to generate nitrogen oxides in the related art.

[0012] Therefore, the present disclosure aims to provide an air cleaning system and a protective clothing that suppresses the input power and enables efficient generation of plasma, thereby enabling decomposition of bacteria and viruses in the air, compared to the conventional technology, in order to eliminate the above problems.

[0013] Means for solving the problems

[0014] To achieve the above object, an air cleaning system according to an embodiment of the present disclosure is an air cleaning system that generates plasma using a voltage, and includes: a first electrode that generates electromagnetic resonance by being supplied with power; a second electrode that is configured to surround the first electrode in a state separate from the first electrode; a power supply that supplies power to the first electrode; an electric field probe that measures the strength of an electric field between the first electrode and the second electrode; and a control unit that controls the power supplied to the first electrode, the control unit controlling the frequency of the power supplied to the first electrode and the position at which the power is supplied to the first electrode to maximize the output value of a signal representing the strength of the electric field measured by the electric field probe.

[0015] Furthermore, in the air cleaning system, a detector that monitors the amount of generated ozone and nitrogen oxides is embedded, ozone is generated by the dissociation of oxygen molecules by plasma, but in the air cleaning system, the amount of ozone generation and the amount of nitrogen oxide generation are set as target values, and the alternating current power, the frequency, and the power supply point are changed to supply energy to the gas molecules to minimize the generation of nitrogen oxides without dissociating nitrogen molecules, thereby enabling control of the electric field applied to the plasma.

[0016] Further, in order to achieve the above object, a protective clothing according to an embodiment of the present disclosure includes an air cleaning system that cleans air taken in from the outside and supplies the cleaned air into a covering body that covers a body surface of a person, and the covering body that covers the body surface of the person.

[0017] In addition, these inclusive or specific embodiments can also be implemented by a drone, a storage device, one or more propeller devices, a system, a method, an integrated circuit, a computer program or a computer-readable CD-ROM and the like recording medium, or any combination thereof.

[0018] Inventive Effects

[0019] According to the present disclosure, the input power is suppressed and the plasma is efficiently generated, so that bacteria and viruses in the air can be decomposed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view showing the air cleaning system according to Embodiment 1.

[0021] Figure 2 is a schematic view showing the flow of air taken into the air cleaning system according to Embodiment 1 and the change of the power supply point at which the power supply unit supplies power to the wire electrode, and the like.

[0022] Figure 3 is a schematic view showing the change of the length of the resonator of the air cleaning system according to Embodiment 1.

[0023] Figure 4 is a schematic view showing the case where viruses are decomposed in the plasma generation region of the air cleaning system according to Embodiment 1.

[0024] Figure 5 is a schematic view showing the flow of air taken into the air cleaning system according to the modification of Embodiment 1 and the change of the power supply point at which the power supply unit supplies power to the wire electrode, and the like.

[0025] Figure 6 is the air cleaning system according to Embodiment 2, and is a block diagram showing the air cleaning system having a flow control valve with an attached flow meter, and the like.

[0026] Figure 7 is a schematic view showing the main body of the air cleaning system according to Embodiment 2.

[0027] Figure 8is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a second filter section, a heater section, a second detector, a first filter section, a first detector, and a pipe, and the like.

[0028] Figure 9 is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a second filter section, a heater section, a second detector, a pipe, a first filter section, and a first detector, and the second detector is provided to the pipe.

[0029] Figure 10 is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a second filter section, a heater section, and a first detector, and the main body section 1a having a control section, and the like is used.

[0030] Figure 11 is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a second filter section, a heater section, and a first detector.

[0031] Figure 12 is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a second filter section and a first detector.

[0032] Figure 13 is a block diagram of an air cleaning system according to Embodiment 2, which is a modification of Embodiment 2, and indicates an air cleaning system having a first detector.

[0033] Figure 14 is a front view of a protective garment according to Embodiment 3, and a schematic view indicating a display section of the protective garment.

[0034] Figure 15 is a side view indicating a case where the protective garment according to Embodiment 3 is viewed from a side.

[0035] Figure 16 is a front view indicating a case where an air cleaning system mounted on the protective garment according to Embodiment 3 sucks a virus or the like together with air.

[0036] Figure 17 is Figure 16 is a sectional view of the air cleaning system mounted on the protective garment according to Embodiment 3 on the XVI-XVI line. DETAILED DESCRIPTION

[0037] In the following, the embodiments of the present application will be described in detail with reference to the drawings. The embodiments described below each represent a mere example of the present application. Therefore, numerical values, shapes, materials, structural elements, arrangements of structural elements, ways of connection, processes, sequences of processes, and the like shown in the following embodiments are not limitative of the present application in any way. Thus, for structural elements in the following embodiments for which structural elements recited in the independent claims are not recited, the description will be made as arbitrary structural elements.

[0038] In addition, each drawing is a schematic view, and is not necessarily strictly illustrated. Further, in each drawing, there is a case where the same reference numeral is given to substantially the same structure, and overlapping description is omitted or simplified.

[0039] Further, in the following embodiments, expressions such as "approximately * * " are used. For example, approximately central portion means not only a completely central portion, but also a substantially central portion, that is, it also means a central portion including an error of, for example, several percent or so. Further, the approximately central portion is a meaning of a central portion in a range in which the effects based on the present disclosure can be achieved. The same applies to other expressions in which "approximately" is used.

[0040] In the following, an air cleaning system and a protective garment according to the embodiments of the present disclosure will be described.

[0041] (Embodiment 1)

[0042] <Structure: Air cleaning system 1>

[0043] The structure of the air cleaning system 1 in the present embodiment will be described.

[0044] Figure 1 is a schematic view that shows the air cleaning system 1 according to Embodiment 1. Figure 2 is a schematic view that schematically shows the flow of air sucked into the air cleaning system 1 according to Embodiment 1, and the change of the power supply point F at which the power supply portion 30 supplies power to the wire electrode 20, and the like.

[0045] As shown in Figure 1 and Figure 2 , the air cleaning system 1 is an air cleaning machine that decomposes, that is, kills and removes bacteria and viruses and the like in air using a high-voltage plasma generation device that generates high-frequency plasma (hereinafter, simply referred to as plasma) using a high voltage of a high frequency band. In the present embodiment, the air cleaning system 1 generates plasma using a high voltage modulated with a carrier wave of 100 MHz to 10 GHz. In addition, the high voltage refers to, for example, a voltage of about 100 V or more. The high voltage of the present embodiment can also be 10 2 to 10 5 V.

[0046] Further, the high frequency band refers to a frequency of about 100 MHz or more. The high frequency band of the present embodiment can also be 100 MHz or more to 10 GHz. Further, the plasma of the present embodiment is an atmospheric pressure plasma generated in an atmospheric air. In addition, the air cleaning system 1 is also capable of decomposing and removing fine particles such as dust, pollen, mites, smoke, and the like floating in the air.

[0047] The air cleaning system 1 is provided with a first housing 10, a wire electrode 20, a power supply portion 30, an electric field probe 40, a second amplifier 41, a detector 42, a voltage converter 35, a driver 36, a control portion 70, a duct 17, a second housing 50, a filter 60, and a fan 51.

[0048] The first housing 10 forms (specifies) a long space 10a that accommodates the wire electrode 20 in a state separated from the wire electrode 20. The first housing 10 is grounded, and thus functions as a grounded electrode. The first housing 10 is configured to surround the wire electrode 20 in order to accommodate the wire electrode 20. In the inside of the first housing 10, that is, in the space 10a, a support body 16a for linking the wire electrode 20 is disposed and fixed. The support body 16a is a support member for separating the inner wall surface of the first housing 10 and the wire electrode 20, and supporting the wire electrode 20 in a specified posture. The support body 16a is made of, for example, polytetrafluoroethylene or the like.

[0049] The first housing 10 is made of a conductor material having high conductivity, such as silver, copper, aluminum, or the like. The first housing 10 is an example of a second electrode.

[0050] The first housing 10 is long in the same direction as the length direction of the wire electrode 20 in order to accommodate the wire electrode 20. In the present embodiment, the first housing 10 is a shape corresponding to the shape of the wire electrode 20, such as a cylindrical shape, but the shape of the first housing 10 is not particularly limited.

[0051] Further, in the first housing 10, a suction port 12a that sucks in air, and a vent port 12b that discharges the air sucked in from the suction port 12a to the duct 17 are formed. The suction port 12a is formed on one end side in the length direction of the first housing 10, and the vent port 12b is formed on the other end side in the length direction of the first housing 10. Air and the like present outside the first housing 10 are sucked in and pass through the suction port 12a. Further, the duct 17 is connected at the vent port 12b, and the air that flows in the space 10a of the first housing 10 by passing through the suction port 12a flows to the duct 17 by passing through the vent port 12b.

[0052] Further, the first housing 10 has a frame 13 in a mesh shape. The frame 13 is provided to the suction port 12a, and covers the opening surface of the suction port 12a.

[0053] The linear electrode 20 is an electrode that is longer in a predetermined direction. The linear electrode 20 is housed in the first housing 10 and is set up in a state separated from the first housing 10. Specifically, the linear electrode 20 is connected to the support 16a in a predetermined posture along the length direction of the first housing 10 and fixed to the first housing 10 via the support 16a in a state where it is separated from the inner wall surface of the first housing 10.

[0054] The linear electrode 20 uses a highly conductive material, such as silver, copper, or aluminum. The linear electrode 20 is one example of the first electrode. Alternatively, the first electrode can also be a plate-shaped electrode, and is not limited to the linear electrode 20.

[0055] like Figure 2 As shown, modulated or unmodulated AC power supplied from the power supply unit 30 is applied to the power supply point F of the linear electrode 20 along its length. The power supply point F is approximately the central portion along the length of the linear electrode 20, and is the point where modulated or unmodulated AC power supplied from the power supply unit 30 is applied. The power supply point F is displaced a predetermined distance along the length of the linear electrode 20 from approximately half its length, based on the output value (e.g., output voltage) of the signal representing the intensity of the electric field measured by the electric field probe 40. The length of the linear electrode 20 refers to the sum of the length of the main body of the linear electrode 20 and the lengths of the first dielectric 22 and the second dielectric 23 along the length of the linear electrode 20.

[0056] A first dielectric 22 and a second dielectric 23 are disposed at one end of the linear electrode 20 (the end on the side of the suction port 12a). The first dielectric 22 and the second dielectric 23 are disposed on the linear electrode 20 in such a way that one end of the linear electrode 20 is not exposed. The first dielectric 22 is a heat-resistant dielectric material disposed around one end of the linear electrode 20. Similarly, the second dielectric 23 is a heat-resistant dielectric material disposed on the end face of one end of the linear electrode 20. Each of the first dielectric 22 and the second dielectric 23 is, for example, a ceramic such as quartz glass or alumina. In this embodiment, the first dielectric 22 is synthetic quartz, and the second dielectric 23 is alumina.

[0057] The linear electrode 20 is supplied with alternating current from the power supply unit 30 to induce resonance within the first housing 10. Alternating current is supplied to the linear electrode 20 to generate resonance with maximum efficiency.

[0058] Figure 3is a diagram showing a change in the 1 / 2 wavelength at the time of resonance of the air cleaning system 1 according to Embodiment 1. The 1 / 2 wavelength at the time of resonance in the space 10a of the first housing 10 indicates the sum of the length in the length direction of the linear electrode 20 and the length of the plasma generated in the plasma generation region P between the one end of the linear electrode 20 and the opening face of the suction port 12a. In Figure 3 In a of Figure 3 In b of Figure 3 In c of

[0059] In the present embodiment, the length of the linear electrode 20 is set so that the plasma is effectively generated in the plasma generation region P in the frequency band of 100 MHz to 10 GHz.

[0060] The plasma generation region P is a region between the one end of the linear electrode 20 and the opening face of the suction port 12a, and is a region for generating the plasma in the space 10a of the first housing 10. The first shortest distance between the one end of the linear electrode 20 and the opening face of the suction port 12a in the plasma generation region P is shorter than the second shortest distance between the other end of the linear electrode 20 and the opening face of the air vent 12b. By setting the first shortest distance shorter than the second shortest distance, the plasma is effectively generated in the plasma generation region P. The plasma generation region P overlaps and covers the opening face of the suction port 12a when the first housing 10 is viewed in the length direction. In the plasma generation region P, the size of the generated plasma and the projected area facing the opening face change depending on the alternating-current electric power supplied to the linear electrode 20.

[0061] In the present embodiment, the length of the linear electrode 20 is set so that the plasma is effectively generated in the plasma generation region P in the frequency band of 100 MHz to 10 GHz. Figure 1 and Figure 2As shown, the power supply section 30 is controlled by the control section 70 to supply the modulated alternating current or the unmodulated alternating current output from the frequency-variable oscillator + modulator 31 to the power supply point F of the linear electrode 20 via the first amplifier 32. The power supply section 30 has the frequency-variable oscillator + modulator 31, the first amplifier 32, the power supply terminal 33, and the power supply wire 34.

[0062] The frequency-variable oscillator + modulator 31 has both functions of a voltage-controlled oscillator and a modulator that supply the modulated alternating current or the unmodulated alternating current to the power supply point F of the linear electrode 20 via the first amplifier 32. Specifically, the frequency-variable oscillator + modulator 31 is controlled by the control section 70 to maximize (or maximize) the output value of the signal measured by the electric field probe 40, thereby controlling the frequency of the alternating current supplied to the linear electrode 20. That is, the frequency-variable oscillator + modulator 31 is controlled by the control section 70 so that the phases of the current (or voltage) when the alternating current amplified by the first amplifier 32 is supplied to the power supply point F and the current when resonance occurs in the space 10a of the first housing 10 become the same phase (synchronous). The frequency-variable oscillator + modulator outputs the alternating current controlled so that these phases are synchronized to the first amplifier 32.

[0063] The first amplifier 32 amplifies the alternating current output from the frequency-variable oscillator + modulator 31 and supplies the amplified alternating current to the power supply point F via the power supply wire 34. The first amplifier 32 amplifies the alternating current at a predetermined magnification, but the amplification amount can be appropriately set.

[0064] The power supply terminal 33 is a connection terminal for supplying the alternating current amplified by the first amplifier 32 to the power supply point F of the linear electrode 20. In order for the power supply wire 34 to be electrically connected to the power supply point F of the linear electrode 20, the power supply terminal 33 is fixed to the first housing 10. The power supply terminal 33 is a holder that holds the power supply wire 34 with respect to the first housing 10.

[0065] The power supply wire 34 is a power line for supplying the alternating current amplified by the first amplifier 32 to the power supply point F of the linear electrode 20. The power supply wire 34 is held by the power supply terminal 33 and can be moved in the length direction of the linear electrode 20 together with the power supply terminal 33 by the driver 36. Alternatively, only the power supply wire 34 can be moved in the length direction of the linear electrode 20 by the driver 36.

[0066] The electric field probe 40 is a sensor that measures the intensity of the electric field between the wire electrode 20 and the first case 10 when the amplified alternating electric power is supplied to the wire electrode 20. The electric field probe 40 measures the intensity of the electric field in the space 10a of the first case 10, and outputs a measurement signal (measured signal) that is proportional to the intensity of the electric field to the detector 42 via the second amplifier 41. As described later, the control section 70 controls the power supply section 30 and the voltage converter 35, and the electric field probe 40 outputs a measurement signal of which the output value becomes the maximum (or the greatest).

[0067] The electric field probe 40 is fixed to the first case 10. The electric field probe 40 is disposed at a position of the first case 10 that is on the side of the air vent 12b of the first case 10 and that opposes the other end side of the wire electrode 20.

[0068] The second amplifier 41 amplifies the measurement signal output by the electric field probe 40, and outputs the amplified measurement signal to the detector 42. The second amplifier 41 amplifies the measurement signal at a prescribed amplification rate, and the amplification amount can also be appropriately set.

[0069] The detector 42 acquires the measurement signal amplified by the second amplifier 41, and detects the acquired measurement signal. For example, the detector 42 detects the measurement signal by a Schottky barrier diode. The detector 42 outputs a signal that represents the detection result based on the detected measurement signal to the control section 70. The signal that represents the detection result becomes a signal that represents the result of monitoring the intensity of the electric field in the first case 10.

[0070] The voltage converter 35 is controlled by the control section 70, and adjusts the voltage supplied to the driver 36 based on a variable power source such as an external power source. The voltage converter 35 adjusts the voltage supplied to the driver 36 according to the detection result based on the measurement signal detected by the detector 42, which is controlled by the control section 70. That is, the voltage converter 35 adjusts the voltage applied to the driver 36, and causes the driver 36 to drive.

[0071] The driver 36 is connected to the power supply terminal 33 of the power supply section 30, and is driven by the voltage applied from the voltage converter 35. The driver 36 is, for example, a piezoelectric element or the like that is driven by being stretched and contracted by the voltage applied thereto. The driver 36 is driven by the voltage applied from the voltage converter 35, and causes the power supply line 34 to move in the length direction of the wire electrode 20. That is, the driver 36 is driven to move the power supply line 34, and thereby displace the position of the power supply point F at which the wire electrode 20 is supplied with the alternating electric power. Specifically, the driver 36 is driven to move the power supply line 34 in the length direction of the wire electrode 20, and thereby displace the position of the power supply point F at which the wire electrode 20 is supplied with the alternating electric power. Figure 2The position of the power supply point F is adjusted with respect to the linear electrode 20 by moving the position of the power supply point F with respect to the linear electrode 20 along the length direction of the linear electrode 20 by a distance Δx. The distance Δx is a displacement amount with respect to a reference position when the reference position is set arbitrarily, and depends on the voltage V supplied from the voltage converter 35 in 1. The reference position is, for example, an initial position in a state where the alternating-current power is not supplied to the linear electrode 20, or a position of 1 / 2 of the length direction of the linear electrode 20, or the like.

[0072] In the linear electrode 20, the average conductivity changes depending on the density of the generated plasma, so the equivalent electrode length changes. Therefore, as a result, the position of the power supply point is slightly moved. The higher the resonance Q value is shown, the better the efficiency of the plasma generated with respect to the input power, the efficiency of the virus decomposition is, but the higher the Q value is, the control of the power supply point F and the control of the resonance frequency in cooperation with this slight movement w are very important, and the present disclosure shows a solution to this problem.

[0073] The control section 70 is, for example, a microcontroller or the like. The control section 70 controls the power supply section 30 and the voltage converter 35.

[0074] The control section 70 controls the power supply section 30, thereby controlling the alternating-current power supplied to the linear electrode 20. That is, the control section 70 controls the frequency of the alternating-current power supplied to the linear electrode 20 so that the output value of the signal measured by the electric field probe 40 becomes maximum. Specifically, the control section 70 controls the frequency-variable oscillator + modulator 31 so that the frequency of the alternating-current power supplied to the linear electrode 20 is controlled in accordance with the detection result based on the measurement signal detected by the detector 42. At this time, the control section 70 controls the frequency-variable oscillator + modulator 31 so that the phase of the current (or voltage) supplied to the power supply point F and the phase of the current (or voltage) at the time of resonance generated in the space 10a of the first housing 10 become the same phase.

[0075] Further, the control section 70 controls the voltage converter 35, thereby also controlling the voltage applied to the driver 36. That is, the control section 70 also controls the position of the supply to the linear electrode 20 so that the output value of the signal measured by the electric field probe 40 becomes maximum. In other words, the control section 70 controls the driver 36 so that the position of the power supply point F is adjusted in accordance with the detection result based on the measurement signal detected by the detector 42.

[0076] In the automatic control of maintaining the resonance state, the detection result based on the measurement signal detected by the detector 42 (which indicates a maximum in the resonance state) is a control quantity, and the frequency of the electric power output from the frequency-variable oscillator + modulator 31 and the position of the supply point F corresponding to the output of the voltage transformer 35 correspond to operation quantities in the present automatic control.

[0077] The control section 70 operates the frequency of the alternating electric power supplied to the linear electrode 20 and the voltage applied to the driver 36 for adjusting the position of the supply point F, and performs feedback control so that the measurement signal measured by the electric field probe 40 that senses the strength of the electric field in the first housing 10 becomes maximum.

[0078] The duct 17 is a pipe that connects the space 10a of the first housing 10 and the space 50a of the second housing 50, and the air sucked in from the suction port 12a of the first housing 10 passes through the duct 17. One end of the duct 17 is connected to the vent 12b of the first housing 10, and the other end of the duct 17 is connected to the vent 50b of the second housing 50. That is, the duct 17 guides the air flowing in the space 10a of the first housing 10 to the space 50a of the second housing 50.

[0079] The second housing 50 forms (specifies) a space 50a that accommodates the filter 60 and the fan 51. The filter 60 and the fan 51 are arranged and fixed in the interior of the second housing 50, that is, the space 50a. The second housing 50 uses a conductor material having high conductivity, such as silver, copper, aluminum, or the like. The second housing 50 can also be an example of a portion that constitutes the second electrode.

[0080] In the present embodiment, the second housing 50 is, for example, a long cylindrical shape, but the shape of the second housing 50 is not particularly limited.

[0081] Further, the second housing 50 forms a vent 50b through which the air guided by the duct 17 passes, and a discharge port 52 for discharging the air intruding from the vent 50b to the outside of the second housing 50. The vent 50b is formed on one end side in the length direction of the second housing 50, and the discharge port 52 is formed on the other end side in the length direction of the second housing 50. The duct 17 is connected at the vent 50b, and the air and the like that have passed through the first housing 10 and the duct 17 pass through the vent 50b. Further, the air of the filter 60 and the like that have passed through the space 50a of the second housing 50 passes through the vent 50b, and is discharged to the outside through the discharge port 52.

[0082] The filter 60 is capable of removing ozone contained in the air generated by the generation of plasma when the air (air sucked in from the suction port 12a of the first case 10) flowing from the air vent 50b side of the second case 50 to the discharge port 52 side passes therethrough. In order to remove the ozone, the filter 60 is disposed in the vicinity of the discharge port 52 in the space 50a of the second case 50. Such a filter 60 contains activated carbon.

[0083] Further, the filter 60 is also capable of adsorbing the debris of bacteria and viruses and the like. The filter 60 adsorbs the debris of bacteria and viruses and the like contained in the air that has passed through the first case 10 and the duct 17.

[0084] In order to suck in the air from the suction port 12a of the first case 10 and discharge the sucked-in air from the discharge port 52 of the second case 50, the fan 51 is a blower that generates an air current inside the first case 10, the duct 17, and the second case 50. The fan 51 is disposed in the space 50a of the second case 50, and in the present embodiment, is disposed on the discharge port 52 side of the second case 50 further than the filter 60. Further, if the electric motor of the fan 51 is driven so that the propeller of the fan 51 rotates (the fan 51 is driven), the air sucked in from the suction port 12a of the first case 10 reaches the space 50a of the second case 50 after sequentially passing through the inside of the space 10a of the first case 10 and the duct 17, and is discharged from the discharge port 52 of the second case 50 after passing through the filter 60.

[0085] In addition, the fan 51 can also be controlled to be driven by the control section 70. That is, the driving of the fan 51 can also be controlled when the control section 70 controls the power supply section 30 and the voltage converter 35.

[0086] < Frequency of alternating current power and position of power supply point F >

[0087] The relationship between the frequency of the alternating current power supplied to the power supply point F at which the output value of the signal measured by the electric field probe 40 becomes maximum, and the position of the power supply point F at which the alternating current power is supplied will be described. If the voltage supplied from the voltage converter 35 to the driver 36 is set to V in 1, the variable dependent on the voltage V in 1 is set to v1, and the control voltage of the frequency-variable oscillator of the frequency-variable oscillator + modulator 31 corresponding to the frequency of the power supplied to the power supply point F is set to V in 2, the variable dependent on the voltage V in 2 is set to v2, and the voltage of the output signal of the detector corresponding to the electric field at the electrode end indicating the detection result outputted from the detector 42 to the control section 70 is set to V0, then it is expressed by the following equations (1) to (3).

[0088] [Num 1]

[0089] V1 = V in 1 (Formula 1)

[0090] [Num 2]

[0091] V2 = V in 2 (Formula 2)

[0092] [Num 3]

[0093] g(V1, V2) = V0 (Formula 3)

[0094] Using the above Formulae (1) to (3), the output value of the signal measured by the electric field probe 40 becomes the maximum function g(V1, V2). That is, the maximum value of g(V1, V2) is found.

[0095] The following Formulae (4) and (5) are satisfied as a condition that the electric field becomes the maximum. Based on g(V1, V2), new functions are defined as shown in Formulae (6) and (7).

[0096] [Num 4]

[0097]

[0098] [Num 5]

[0099]

[0100] [Num 6]

[0101]

[0102] [Num 7]

[0103]

[0104] If Formulae (6) and (7) are used, the points (V1, V2) at which g1(V1, V2) and g2(V1, V2) respectively become 0 are found, and are expressed by the following Formulae (8) and (9).

[0105] [Num 8]

[0106]

[0107] [Num 9]

[0108]

[0109] In Formulae (8) and (9), it is assumed that

[0110] [Num 10]

[0111]

[0112]

Number 11

[0113]

[0114] neglect

[0115]

Number 12

[0116] Therefore, it was used

[0117]

Number 13

[0118]

[0119] as well as

[0120]

Number 14

[0121]

[0122] The following (Equation 10) and (Equation 11) are used to represent it.

[0123]

Number 15

[0124]

[0125]

Number 16

[0126]

[0127] Furthermore, if we solve equations (10) and (11), we can express them as equations (12) and (13).

[0128]

Number 17

[0129]

[0130]

Number 18

[0131]

[0132] <Action>

[0133] The operation of the air cleaning system 1 in this embodiment will be explained.

[0134] like Figure 1 as well as Figure 2 As shown, if the air cleaning system 1 is driven, the control unit 70 controls the drive of the power supply unit 30 and the voltage converter 35. At this time, the control unit 70 may also drive the fan 51 together with the power supply unit 30 and the voltage converter 35.

[0135] The control unit 70 controls the power supply unit 30, thereby generating plasma in the plasma generation region P. If air containing, for example, bacteria and viruses is drawn in from the intake port 12a of the first housing 10 by the rotation of the fan 51, the air passes through the plasma generation region P formed between the intake port 12a and the linear electrode 20.

[0136] like Figure 4 As shown, bacteria and viruses in the air are decomposed and sterilized by the plasma as they pass through the plasma generation region P. For example, bacteria and viruses are decomposed by the collision between molecules, atoms, ions, electrons, etc., dissociated due to the generation of plasma, and by ozone and ultraviolet light generated by the plasma. In addition, microparticles such as dust, pollen, mites, and smoke in the air are also decomposed. Figure 4 This is a schematic diagram illustrating the decomposition of viruses in the plasma generation region P of the air cleaning system 1 according to Embodiment 1.

[0137] like Figure 2 As shown, the debris and dust, including the remains of decomposed bacteria and viruses, pass through the space 10a of the first housing 10 along with the air, and flow through the pipe 17 to the second housing 50. The debris is then adsorbed and removed from the air by the filter 60 of the second housing 50. Thus, the air that has passed through the filter 60 is purified and discharged from the exhaust port 52 of the second housing 50. In this way, the air purification system 1 can remove bacteria and viruses from the air, supplying clean air.

[0138] <Variation Example>

[0139] In addition, as a variation of Embodiment 1, when the above-mentioned filter 60 is set as the first filter 60, the air cleaning system 1 may also have a second filter 61 that is different from the first filter 60.

[0140] Figure 5 This is a schematic diagram illustrating the flow of air drawn into the air purification system 1 involved in the modified embodiment 1, and the change of the power supply point F supplied by the power supply unit 30 to the linear electrode 20.

[0141] like Figure 5 As shown, the second filter 61 is disposed between the first filter 60 and the vent 50b of the second housing 50. That is, the second filter 61 is disposed upstream of the first filter 60 in the airflow. The second filter 61 is, for example, an NO2 filter.

[0142] <Effects>

[0143] The effects of the air cleaning system 1 in this embodiment will be explained.

[0144] As described above, the air cleaning system 1 according to the present embodiment is an air cleaning system 1 that generates plasma using voltage, and includes a wire electrode 20 that generates electromagnetic resonance by being supplied with alternating current power; a first housing 10 that is configured to surround the wire electrode 20 in a state separate from the wire electrode 20; a power supply portion 30 that supplies the wire electrode 20 with alternating current power; an electric field probe 40 that measures the strength of an electric field between the wire electrode 20 and the first housing 10; and a control portion 70 that controls the alternating current power supplied to the wire electrode 20. The control portion 70 controls the frequency of the power supplied to the wire electrode 20 and the position at which the power is supplied to the wire electrode 20 so that the output value of a signal representing the strength of the electric field measured by the electric field probe 40 is maximized.

[0145] Accordingly, by supplying the wire electrode 20 with alternating current power, plasma can be generated between the wire electrode 20 and the first housing 10. Furthermore, the control portion 70 controls the frequency of the alternating current power and the position at which the alternating current power is supplied to the wire electrode 20. Thus, the phase of the current when the alternating current power is supplied to the wire electrode 20 and the phase of the current when resonance is generated in the wire electrode 20 can be made to be in phase in synchronization with (following) the change in the resonance frequency based on the generation of plasma. At this time, since the alternating current power that is made to be in synchronization with the change in the resonance frequency can be supplied to the wire electrode 20, the electromagnetic resonance state can be controlled to be maintained at all times, and the output value of the signal measured by the electric field probe 40 can be maximized at all times.

[0146] Thus, in the air cleaning system 1, the input power is suppressed and plasma is efficiently generated compared to the past, and thus bacteria and viruses and the like in the air can be decomposed.

[0147] In particular, in the air cleaning system 1, the input power can be suppressed, and thus the production of a high-voltage circuit, a step-up transformer, and the like does not become difficult, and the power supply portion 30 that constitutes the power supply of the air cleaning system 1 does not become large. Furthermore, in the air cleaning system 1, the heat generation of the power supply portion 30 based on an increase in the current value and the damage to the electrode based on the heat generation and the like can also be suppressed. Thus, in the air cleaning system 1, the production cost does not increase.

[0148] In addition, in the air cleaning system 1, it is also possible to be designed so that the Q value of the resonance is increased, and in this case, the alternating current power input to the wire electrode 20 can be suppressed.

[0149] In addition, there are methods of removing bacteria and viruses and the like by using chemical means such as peracetic acid, hydrogen peroxide, ethylene oxide, ozone and the like, but there are concerns about the effects on the human body. Furthermore, there are methods of removing bacteria and viruses and the like by physical means such as high-pressure steam, radiation, ultraviolet rays and the like, but in this case, from the viewpoints of the effects on the human body, constraints on the conditions of use, lower energy efficiency and the like, it is not practical. However, in the air cleaning system 1 of the present embodiment, bacteria and viruses and the like can be removed more cheaply and effectively than in the past.

[0150] Furthermore, the air cleaning system 1 according to the present embodiment is provided with a driver 36 that displaces the position of the power supply point F at which the power supply section 30 supplies alternating current to the wire electrode 20. Also, the control section 70 controls the driver 36, thereby adjusting the position of the power supply point F.

[0151] Accordingly, the control section 70 can displace the position of the power supply point F so that the output value of the signal measured by the electric field probe 40 becomes maximum. Therefore, in this air cleaning system 1, it is possible to easily follow changes in the resonance frequency in the electromagnetic resonance based on the generation of plasma.

[0152] Furthermore, in the air cleaning system 1 according to the present embodiment, the control section 70 controls both the frequency and the position of the power supply point F on the wire electrode 20, and controls the driver 36 and the power supply section 30 so that the output voltage of the electric field probe 40 becomes maximum. In other words, the control section 70 performs feedback control so that the output voltage of the electric field probe 40 becomes maximum by operating the frequency and the position of the power supply point F on the wire electrode 20.

[0153] Accordingly, it is possible to maintain resonance, so it is possible to more realistically suppress the input power and efficiently generate plasma.

[0154] Furthermore, in the air cleaning system 1 according to the present embodiment, the first housing 10 is a housing that forms a suction port 12a that sucks in air. Also, there is a filter 60 that is disposed in the vicinity of a discharge port 52 that discharges air sucked in from the suction port 12a, and that removes nitrogen oxides and ozone generated by the plasma reactor having the wire electrode 20 and the first housing 10 when the air sucked in from the suction port 12a passes through.

[0155] Accordingly, it is possible to supply clean air in which the remains of bacteria and viruses and the like that are decomposed by plasma and the like have been removed.

[0156] Further, in the air cleaning system 1 according to the present embodiment, the linear electrode 20 is a long electrode. Further, the first housing 10 forms a long space 10a that accommodates the linear electrode 20 along the length direction of the linear electrode 20. Further, between the linear electrode 20 and the suction port 12a of the first housing 10, a plasma generation region P for generating plasma in the space 10a is formed.

[0157] Accordingly, since the plasma generation region P is formed in the vicinity of the suction port 12a, the air that passes through the suction port 12a can surely pass through the plasma generation region P. Therefore, the bacteria and viruses and the like contained in the air can surely be decomposed.

[0158] (Embodiment Two)

[0159] The air cleaning system 2a according to the present embodiment will be described.

[0160] In the present embodiment, the air cleaning system 2a further has a second filter section 101, a heater section 102, a third filter section 103, and a first detector 105a, which are different from the air cleaning system according to Embodiment One. The structure of the main section la in the air cleaning system 2a according to the present embodiment is the same as that of the air cleaning system according to Embodiment One, and the same reference numerals are given to the same structures, and detailed description related to the structures will be omitted. In the present embodiment, the air cleaning system 2a according to Embodiment One is referred to as the main section la.

[0161] Figure 6 is a block diagram showing the air cleaning system 2a according to Embodiment Two, which further has a flow control valve 115 with a flow meter and the like. Figure 7 is a schematic view showing the main section la of the air cleaning system 2a according to Embodiment Two.

[0162] As shown in Figure 6 and Figure 7 , the air cleaning system 2a has a main section la, a second filter section 101, a heater section 102, a third filter section 103, and a first detector 105a.

[0163] The main section la has a plasma reactor 3a and a first filter section 60a.

[0164] The plasma reactor 3a has, in addition to the first case 10, the linear electrode 20, the electric field probe 40, the driver 36, the power supply terminal 33, and the power supply line 34, a light splitter 111 and a third dielectric 112. Alternatively, the plasma reactor 3a can selectively have at least one or more of the frequency-variable oscillator + modulator 31, the first amplifier 113, the second amplifier 114, the second amplifier 41, the detector 42, the voltage converter 35, the control section 70, and the duct 17.

[0165] In the present embodiment, the first amplifier 113 and the second amplifier 114 are provided in the air cleaning system 2a instead of the first amplifier of the first embodiment. The first amplifier 113 is, for example, an operational amplifier that transforms impedance, and the second amplifier 114 is, for example, a power amplifier. The first amplifier 113 and the second amplifier 114 are included in the structure of the power supply section 30.

[0166] The light splitter 111 is disposed on the suction port 12a side of the first case 10. Specifically, the light splitter 111 is fixed to the outer peripheral surface of the first case 10 on the suction port 12a side of the first case 10. The light splitter 111 detects the light emission intensity of the plasma in the plasma generation region P. The light splitter 111 can output the detected result to the control section 70, and the control section 70 can operate the frequency (frequency-variable oscillator + modulator 31) and the position of the power supply point (output voltage of the voltage converter) based on the detected result.

[0167] The third dielectric 112 is disposed in the space 10a of the first case 10. Specifically, the third dielectric 112 is disposed in the vicinity of the suction port 12a so as to surround or sandwich the suction port 12a of the first case 10. The third dielectric 112 is also in the vicinity of the second dielectric 23 at one end of the linear electrode 20. The third dielectric 112 is a dielectric material having high heat resistance. The third dielectric 112 is, for example, quartz glass, alumina, or the like.

[0168] The first filter section 60a has the second case 50, the first filter 60, the second filter 61, the fan 51, and the flow control valve 115 with a flow meter. The first filter section 60a can also have the duct 17. The first filter 60 uses activated carbon in the present embodiment, but can be replaced with ammonia to decompose nitrogen oxides by a catalyst.

[0169] The flow control valve 115 with a flow meter is disposed between the fan 51 and the first filter 60. That is, the flow control valve 115 with a flow meter measures or controls the flow rate of the air that has passed through the first filter 60 and flows from the first filter 60 to the fan 51.

[0170] The second filter section 101 filters the air before the air is sucked as outside air from the suction port 12a of the first housing 10 of the plasma reactor 3a. That is, the second filter section 101 is an air filter disposed on the upstream side of the plasma reactor 3a. The second filter section 101 removes floating particles contained in the air before being sucked into the plasma reactor 3a. The floating particles include not only bacteria and viruses, but also dust, pollen, mites, smoke, and the like. The second filter section 101 is, for example, an activated carbon, a photocatalyst, a HEPA (High Efficiency Particulate Air Filter) filter, a ULPA (Ultra Low Penetration Air Filter) filter, a MEPA (Medium Efficiency Particulate Air Filter) filter, or the like. The air, from which the floating particles are removed, that has passed through the second filter section 101 flows through the heater section 102.

[0171] The heater section 102 adjusts the amount of moisture contained in the air that has passed through the second filter section 101, thereby adjusting the amount of moisture (humidity) of the air flowing through the plasma reactor 3a of the main body section la. The heater section 102 has a humidity adjusting heater for adjusting the humidity of the passed air, and a demister that separates moisture contained in the air from the air. The air, the humidity of which is adjusted by passing through the heater section 102, flows through the plasma reactor 3a.

[0172] The plasma reactor 3a decomposes bacteria and viruses and the like contained in the air flowing from the heater section 102 to the plasma reactor 3a. In the plasma reactor 3a, alternating-current power controlled by the control section 70 is supplied so that an energy intermediate between the dissociation energy of oxygen molecules (about 5 eV) and the dissociation energy of nitrogen molecules (about 9 eV) contained in the air is given to the gas molecules by the plasma, and only the oxygen molecules are dissociated. The air that has passed through the plasma reactor 3a is filtered by the first filter section 60a and flows through the third filter section 103.

[0173] The third filter section 103 further filters the air that has passed through the plasma reactor 3a and the first filter section 60a. That is, the third filter section 103 is an air filter configured on the downstream side of the plasma reactor 3a. The third filter section 103 removes dust contained in the air that has passed through the plasma reactor 3a. The third filter section 103 is, for example, an activated carbon, a photocatalyst, a HEPA filter, a ULPA filter, a MEPA filter, or the like. The air (cleaned air) that has passed through the third filter section 103, from which dust has been removed, flows through the first detector 105a.

[0174] The first detector 105a detects and measures the amounts of ozone and nitrogen oxides contained in the cleaned air generated by the generation of plasma. The first detector 105a outputs the measurement results of the amounts of ozone and nitrogen oxides contained in the cleaned air to the control section 70. The first detector 105a is an example of a detector.

[0175] In order to control so that the amount of ozone by the generation of plasma is always fixed and becomes an intermediate value of the dissociation energy of oxygen molecules and nitrogen molecules in which nitrogen oxides are not substantially generated, based on the measurement results of the amounts of ozone and nitrogen oxides contained in the air measured by the first detector 105a, the control section 70 operates the frequency-variable oscillator + modulator 31 and the amplifier 32 to thereby operate the electric power supplied to the linear electrode 20. This control can also be feedback control using this operation. Further, the control section 70 controls so as to temporarily stop the air cleaning system 2a so that the cleaned air is not discharged from the air cleaning system 2a in the case where ozone and nitrogen oxides exceeding a prescribed amount are measured.

[0176] Further, in order to control so that the amount of ozone is always fixed, based on the measurement results from the first detector 105a and the like, the control section 70 operates the amplitude of the alternating current power supplied to the linear electrode 20 via the frequency-variable oscillator + modulator 31, or applies amplitude modulation to the alternating current power, or operates so as to repeatedly between a fixed value and zero intermittently by amplitude modulation. This control can also be feedback control. For example, the control section 70 operates the duty ratio of the alternating current power by amplitude modulation to thereby control the amount of generation of plasma. Thereby, it is possible to control the amounts of ozone and nitrogen oxides contained in the cleaned air.

[0177] Further, when the control section 70 performs amplitude modulation via the frequency-variable oscillator + modulator 31, the waveform of the alternating-current power supplied to the linear electrode 20 becomes a waveform in which a carrier wave is amplitude-modulated. At this time, in order to control to, for example, an amount of ozone originally contained in the atmosphere of the Earth or less, it is preferable that the concentration of ozone be 0.1 ppm or less, and the control section 70 operates the power supplied to the linear electrode 20 via the frequency-variable oscillator + modulator 31. This control can also be feedback control.

[0178] <Effects>

[0179] The effects of the air cleaning system 1 in the present embodiment will be described.

[0180] For example, in the conventional air cleaning system, it is difficult to control the dissociation of nitrogen molecules due to a strong electric field corresponding to the peak of the pulse, and the production of nitrogen oxides as a result thereof.

[0181] Therefore, in the air cleaning system 2a of the present embodiment, the first detector 105a that monitors the amount of generated ozone and nitrogen oxides is provided. Ozone is generated by the dissociation of oxygen molecules by plasma, but in this air cleaning system 2a, in order to minimize the generation of nitrogen oxides without dissociating nitrogen molecules, the energy is input to the gas molecules, the amount of ozone generation and the amount of nitrogen oxide generation are maintained as target values of the control object, the electromagnetic resonance state is maintained, and the waveform of the input power is operated, or the amplitude modulation is operated, or the electric field applied to the plasma is operated, and it is possible to prevent the emission of harmful gases, and it is possible to perform safe and highly efficient air cleaning. The control corresponding to these operations can also be feedback control.

[0182] Thus, in the air cleaning system 1 related to the present embodiment, the control section 70 acquires the measurement result of the amount of ozone contained in the air that has passed between the linear electrode 20 and the first housing 10 (or the plasma generation region P) from the first detector 105a, and based on the acquired measurement result, the supplied power is operated to perform control so that the amount of ozone generated by the generation of plasma in the air passing between the linear electrode 20 and the first housing 10 is always fixed, and becomes an intermediate value of the dissociation energy of oxygen molecules and nitrogen molecules in which nitrogen oxides are not substantially generated. This operation can also be feedback control.

[0183] Accordingly, in the plasma reactor 3a, on the basis of generating the minimum amount of ozone required for decomposition of viruses efficiently, the concentration of ozone contained in the cleaned air is set to a concentration that is harmless to the human body or the like, and bacteria and viruses contained in the air are killed, and the generated ozone is easily removed by the filter 60.

[0184] Further, in the air cleaning system 1 according to the present embodiment, the power supplied to the wire electrode 20 is alternating current power. Also, the control section 70 controls so that the amount of generated ozone is always fixed. For example, in order to control to be below the amount of ozone originally contained in the atmosphere of the earth, the amplitude of the supplied alternating current power is operated. This control can also be feedback control.

[0185] In this case, it is possible to set the concentration of ozone contained in the cleaned air to a concentration that is less harmful to the human body or the like, to be below the amount of ozone originally contained in the atmosphere of the earth, for example, and to kill bacteria and viruses contained in the air, and it is possible to easily remove the generated ozone by the filter 60.

[0186] Further, in the air cleaning system 1 according to the present embodiment, the waveform of the alternating current power supplied to the wire electrode 20 is a waveform in which a carrier wave is amplitude-modulated. Also, the control section 70 controls so that the amount of generated ozone is fixed, and in order to control to be below the amount of ozone originally contained in the atmosphere of the earth, for example, the amplitude modulation is operated so as to be repeated between a fixed value and zero. This control can also be feedback control.

[0187] In this case, it is also possible to set the concentration of ozone contained in the cleaned air to a concentration that is less harmful to the human body or the like, to be below the amount of ozone originally contained in the atmosphere of the earth, for example, and to kill bacteria and viruses contained in the air, and it is possible to easily remove the generated ozone by the filter 60.

[0188] Further, in the air cleaning system 1 according to the present embodiment, the waveform of the alternating current power supplied to the wire electrode 20 is a waveform in which a carrier wave is amplitude-modulated. Also, the control section 70 controls so that the amount of generated ozone is fixed. In order to control to be below the amount of ozone originally contained in the atmosphere of the earth, for example, the time interval thereof is operated so that the amplitude modulation is repeatedly between a fixed value and zero intermittently. This control can also be feedback control.

[0189] In this case, it is also possible to set the concentration of ozone contained in the cleaned air to a concentration that is less harmful to the human body or the like, to be below the amount of ozone originally contained in the atmosphere of the earth, for example, and to kill bacteria and viruses contained in the air, and it is possible to easily remove the generated ozone by the filter 60.

[0190] Further, in the air cleaning system 1 according to the present embodiment, the control section 70 operates the supplied power in order to control so that the concentration of ozone becomes 0.1 ppm or less. This control can also be feedback control.

[0191] In this case, the concentration of ozone contained in the cleaned air can also be set to a concentration that is less harmful to the human body and the like, to an amount of ozone that is originally contained in the atmosphere of the Earth, for example, and bacteria and viruses contained in the air are killed, and the generated ozone can be easily removed by the filter 60.

[0192] Further, in the air cleaning system 1 according to the present embodiment, plasma is generated using a high voltage of a continuous wave subjected to frequency modulation of 100 MHz to 10 GHz.

[0193] In the air cleaning system 1, the Q value becomes 1000 or more, so the input high-frequency voltage can be accurately boosted to 1000 times or more. In this case, the power efficiency from the first amplifier 32 to the wire electrode 20 of the air cleaning system 1 is supplied at 99% or more, so the power efficiency becomes substantially 100%. In the case where a high voltage of a high frequency of 100 MHz to 10 GHz is supplied to the wire electrode 20, the vibration amplitude of electrons in the first housing 10 is not so large, and the speed of the electrons also becomes a limited range, so a high-density plasma can be generated.

[0194] For example, the dissociation energy of a nitrogen molecule is about 9 eV, the dissociation energy of an oxygen molecule is about 5 eV, and the envelope destruction energy of a virus contained in air is about 5 eV or less, for example. In the air cleaning system 1, a gas molecule is subjected to an energy of about 5 eV or more to inhibit the generation of nitrogen oxides and to dissociate an oxygen molecule to effectively generate ozone. Thus, not only direct attack of ionized ions, electrons, and radicals on viruses, i.e., inelastic collision, but also ozone can be effectively generated by dissociation of an oxygen molecule to decompose viruses and inhibit the generation of harmful nitrogen oxides. Further, in the present application, the frequency of the input power and the position of the power supply point are adjusted and operated to feedback control the change in the resonance state accompanying the change in the kind and amount of the gas molecules flowing in and the plasma state to always maintain the electromagnetic resonance state, a high "power-virus" decomposition efficiency can be maintained, and the waveform and amplitude of the input power in the resonance state are operated as a means of operating the strength (average strength) of the input power, for example, to effectively generate the minimum amount of ozone required to decompose viruses, and the concentration of ozone contained in the air used for human respiration and finally discharged from the air cleaner can be controlled to be 0.1 ppm or less or an amount originally contained in the atmosphere on the Earth. The control corresponding to these series of operations can also be feedback control.

[0195] Further, if the concentration of ozone is 0.1 ppm or less, it can be removed by the filter 60 or the like. In order to give the energy of the dissociation energy of oxygen or less, or the energy corresponding to the dissociation energy of oxygen to the gas molecules inputted to the plasma reactor 3a, the detection result of the first detector 105 is fed back to the control section 70. Thus, the necessary minimum ozone required for decomposing bacteria and viruses or the like is generated, and the cleaned air in which the generation of nitrogen oxides is suppressed can be supplied as the cleaned air required for human respiration.

[0196] Further, if a high voltage of a high frequency is supplied to the wire electrode 20, thereby causing the energy exceeding the dissociation energy of the nitrogen molecules contained in the gas inputted to the plasma reactor 3a to be given, nitrogen oxides are generated also due to the nitrogen molecules contained in the air, and excessive ozone is generated as a purpose of decomposing viruses. The generation of plasma is controlled (the control section 70 controls the alternating current power of a high frequency supplied to the wire electrode 20) so that nitrogen oxides are not generated, and the concentration of ozone contained in the cleaned air becomes a concentration (for example, 0.1 ppm) harmless to the human body or the like, thereby killing bacteria and viruses contained in the air with the necessary minimum ozone, and the remaining ozone can be easily removed by the filter 60.

[0197] <Variant Example One>

[0198] Figure 8 The air cleaning system 2b is a block diagram showing the air cleaning system 2b having the second filter section 101, the heater section 102, the second detector 105b, the first filter section 60a, the first detector 105a, and the pipe 17a, which is a variant example one of the embodiment two. In the air cleaning system 2b, the second filter section 101, the heater section 102, the second detector 105b, the first filter section 60a, and the first detector 105a are provided in the main body section lb. Figure 8 In the air cleaning system 2b, the flow of air as outside air is indicated by a solid arrow, and the flow of a measurement result or the like signal is indicated by a dashed arrow.

[0199] The air cleaning system 2b of the present variant example differs from the embodiment two in that the control section 70 is provided in the main body section lb or the like.

[0200] As a variant example one of the embodiment two, the air cleaning system 2b has the main body section lb, the second filter section 101, the heater section 102, the second detector 105b, the first filter section 60a, and the first detector 105a. In the present variant example, the air cleaning system 2b does not have the third filter section of the embodiment two. In the present variant example, the first filter section 60a is used instead of the third filter section of the embodiment two.

[0201] The main body 1b has a plasma reactor 3b, a control section 70. In the present embodiment, the main body 1b does not have the first filter section 60a. The first filter section 60a is disposed on the downstream side of the plasma reactor 3b in order for the air that has passed through the plasma reactor 3b to flow in. In addition, the main body 1b has Figure 7 the frequency-variable oscillator + modulator 31, the first amplifier 113, the second amplifier 114, the second amplifier 41, the detector 42, the voltage converter 35, the duct 17, the second case 50, the filter 60, and the fan 51, but the structure is simplified in Figure 8 .

[0202] The plasma reactor 3b has the first case 10, the wire electrode 20, the power supply section 30, the electric field probe 40, the driver 36, the spectrometer 111, the third dielectric 112, the first amplifier 113, the second amplifier 114, the second amplifier 41, the detector 42, and the voltage converter 35.

[0203] The second detector 105b is disposed between the plasma reactor 3b and the first filter section 60a, and the air that has passed through the plasma reactor 3b passes through the second detector 105b. The second detector 105b detects and measures the amounts of ozone and nitrogen oxides contained in the gas in which bacteria and viruses and the like have been decomposed by the plasma cleaning. The second detector 105b also outputs the measurement result of the amounts of ozone and nitrogen oxides contained in the cleaned air to the control section 70, as with the first detector 105a. The second detector 105b can also be an example of a detector.

[0204] The control section 70 controls the measurement result of the second detector 105b as a control object, and operates the power supply section 30 and the alternating-current power supplied to the wire electrode 20 of the plasma reactor 3b. The operation can also be feedback control. The control section 70 controls so as to suppress the generation of ozone and nitrogen oxides in the case where the amounts of ozone and nitrogen oxides measured exceed a prescribed amount, and operates the alternating-current power supplied to the wire electrode 20. The operation can also be feedback control.

[0205] Furthermore, in the air cleaning system 2b of this modified example, a pipe 17a is provided to return the air that has passed through the second detector 105b to the plasma reactor 3b. For example, the pipe 17a connects from the outlet side of the first housing 10 of the plasma reactor 3b to the inlet side 12a. In this embodiment, the pipe 17a connects from the pipe connecting the second detector 105b and the first filter section 60a to the pipe connecting the heater section 102 and the plasma reactor 3b. The pipe 17a returns to the inlet 12a side of the first housing 10 to circulate a portion of the air that has passed through the first housing 10. Additionally, a fan or similar device for returning air to the plasma reactor 3b may also be provided in the pipe 17a.

[0206] In the first detector 105a, the cleaned gas that has passed through the first filter section 60a passes through.

[0207] The air cleaning system 2b involved in this variation has a pipe 17a that returns a portion of the air drawn in from the intake port 12a, which passes through the interior of the first housing 10 (plasma reactor 3b), to the side of the intake port 12a.

[0208] Accordingly, a portion of the air that has passed through the first chamber 10 is returned to the intake port 12a, thereby effectively breaking down airborne substances such as bacteria and viruses again. This recirculation of a portion of the air that has passed through the first chamber 10 further purifies the air.

[0209] <Variation Example 2>

[0210] Figure 9 The air cleaning system 2c described in the second variation of Embodiment 2 is a block diagram showing an air cleaning system 2c having a second filter section 101, a heater section 102, a second detector 105b, a piping 17a, a first filter section 60a, and a first detector 105a, with the second detector 105b disposed in the piping 17a.

[0211] In the air cleaning system 2c of this modified example, the second detector 105b is located at a point on the piping 17a, which is different from the modified example of embodiment 2.

[0212] like Figure 9 As shown, piping 17a extends from the pipe connecting plasma reactor 3b and the first filter section 60a to the pipe connecting heater section 102 and plasma reactor 3b. A second detector 105b is mounted on piping 17a. Additionally, the main body 1b has… Figure 7the frequency-variable oscillator + modulator 31, the first amplifier 113, the second amplifier 114, the second amplifier 41, the wave detector 42, the voltage converter 35, the pipe 17, the second case 50, the filter 60, and the fan 51, etc. are shown, but the configuration is simplified in Figure 9

[0213] The first filter portion 60a is connected to the plasma reactor 3b, and filters the air that has passed through the plasma reactor 3b.

[0214] In the air cleaning system 2c, in order to prevent the generation of nitrogen oxides that are harmful to the human body, control is performed so that energy in the vicinity of the dissociation energy of O2 (for example, about 5 eV) below the dissociation energy of N2 (for example, about 9 eV) is given to the molecules (O2, N2, etc.) contained in the air flowing into the air cleaning system 2c, and the control portion 70 operates the intensity or the waveform of the input power to the plasma reactor (average intensity). This operation can also be feedback control. In the control by the control portion 70, control is performed so that the output of the second detector 105b inside or outside the plasma reactor 3b becomes, for example, 1 ppm or less of the ozone generation amount.

[0215] Thus, in this modification, the control portion 70 operates the input power to the plasma reactor 3b so as to control so that energy above the dissociation energy of oxygen molecules and below the dissociation energy of nitrogen molecules contained in the air drawn in from the suction port 12a is given to the gas input to the plasma reactor 3b. This operation can also be feedback control.

[0216] <Modification Example Three>

[0217] Figure 10 The air cleaning system 2e of Modification Example Three of Embodiment Two is a block diagram showing an air cleaning system 2e that has a second filter portion 101, a heater portion 102, and a first detector 105a, and uses a main body portion 1a having a control portion 70, etc.

[0218] The air cleaning system 2e of this modification differs from Modification Example Two of Embodiment Two in that the second detector and the pipe are not provided, and the main body portion 1c has the first filter portion 60a.

[0219] As shown in Figure 10 The main body portion 1c of this modification has a plasma reactor 3b, a first filter portion 60a, and a control portion 70. In addition, the main body portion 1c has Figure 7 the frequency-variable oscillator + modulator 31, the first amplifier 113, the second amplifier 114, the second amplifier 41, the wave detector 42, the voltage converter 35, the pipe 17, the second case 50, the filter 60, and the fan 51, etc. are shown, but the configuration is simplified in​Figure 10 The structure is simplified.

[0220] <Variant Example Four>

[0221] Figure 11 is a block diagram showing an air cleaning system 2f having a second filter section 101, a heater section 102, and a first detector 105a, according to Variant Example Four of Embodiment Two.

[0222] The air cleaning system 2f of the present variant example differs from Variant Example Three of Embodiment Two in that the main body section la is used with Figure 6

[0223] As shown in Figure 11 , the main body section la has a plasma reactor 3a, a first filter section 60a. The plasma reactor 3a has a first housing 10, a wire electrode 20, a power supply section 30, a driver 36, a spectrometer 111, a third dielectric 112, an electric field probe 40, a second amplifier 41, a detector 42, a voltage converter 35, a control section 70, and the like, as shown in Figure 7

[0224] <Variant Example Five>

[0225] Figure 12 is a block diagram showing an air cleaning system 2g having a second filter section 101 and a first detector 105a, according to Variant Example Five of Embodiment Two.

[0226] The air cleaning system 2g of the present variant example differs from Variant Example Four of Embodiment Two in that the heater section is not provided.

[0227] As shown in Figure 12 , the second filter section 101 is connected to the main body section la, and air that has passed through the second filter section 101 is drawn into the plasma reactor 3a of the main body section la.

[0228] <Variant Example Six>

[0229] Figure 13 is a block diagram showing an air cleaning system 2h having a first detector 105a, according to Variant Example Six of Embodiment Two.

[0230] The air cleaning system 2h of the present variant example differs from Variant Example Five of Embodiment Two in that the second filter section is not provided.

[0231] As shown in Figure 13 , the plasma reactor 3a of the main body section la directly draws in air as ambient external air. ​​

[0232] (Embodiment Three)

[0233] The protective clothing 200 according to Embodiment Three will be described.

[0234] In the present embodiment, the point at which the air cleaning system 100 is mounted to the protective clothing 200 is different from that of Embodiment One. The structure of the air cleaning system 100 of the present embodiment is the same as that of Embodiment One, and the same reference numerals are assigned to the same structures, and detailed description related to the structure is omitted.

[0235] Figure 14 is a schematic view showing a front view of the protective clothing 200 according to Embodiment Three, and a display portion 201d of the protective clothing 200. Figure 15 is a side view showing a case in which the protective clothing 200 according to Embodiment Three is viewed from the side.

[0236] As shown in Figure 14 and Figure 15 , the protective clothing 200 is provided with the air cleaning system 100, a covering body 201, and a display portion 201d.

[0237] The air cleaning system 100 cleans the air taken in from the outside, and supplies the cleaned air to the inside of the covering body 201. That is, the air cleaning system 100 decomposes and removes bacteria and viruses and the like contained in the air to clean the air, and supplies the cleaned air to the inside of the covering body 201.

[0238] The covering body 201 is the protective clothing 200 in which the air cleaning system 100 is mounted, and which covers the surface of the body of a person. The covering body 201 can cover the whole body of a person, and keeps the inside in a closed state. The covering body 201 is provided with an outer skin portion 201x that covers the head, upper limbs, body trunk, and lower limbs of a person who is a wearer, a helmet 201a that protects the head from above the outer skin portion 201x, gloves 201b that protect both hands, and boots 201c that protect both feet. The outer skin portion 201x and the helmet 201a are joined by a joining body such as a joint portion, the outer skin portion 201x and the gloves 201b are joined by another joining body, and the outer skin portion 201x and the boots 201c are further joined by another joining body.

[0239] On the back side of the covering body 201, a housing body 90 that houses the air cleaning system 100 is mounted. The housing body 90 constitutes an outer cover of the air cleaning system 100. The housing body 90 can be included in the structure of the protective clothing 200, or can be included in the structure of the air cleaning system 100.

[0240] Figure 16is a front view showing a case where the air cleaning system 100 mounted on the protective suit 200 according to Embodiment 3 sucks in air together with viruses and the like. Figure 17 is a sectional view of the air cleaning system 100 mounted on the protective suit 200 according to Embodiment 3, taken along the line XVI-XVI of Figure 16 Figure 17 The arrows of

[0241] As shown in Figure 16 and Figure 17 In the air cleaning system 100, air around the air cleaning system 100 is sucked in from a plurality of suction ports 12a formed on the back side of the housing 90 (the side opposite to the side of the cover 201). The sucked-in air is cleaned by the air cleaning system 100 and is supplied to the inside of the protective suit 200 through the supply pipe 91. In the air cleaning system 100, air sucked into the cover 201 is discharged from a plurality of discharge ports 52 formed on the back side of the housing 90. In the case of the discharged air, air in the inside of the protective suit 200 is discharged to the outside of the protective suit 200 through the supply pipe 92. In the protective suit 200, cleaned air is supplied to the inside of the protective suit 200 via the air cleaning system 100, or air breathed by a person is discharged from the inside of the protective suit 200 to the outside of the protective suit 200 in the inside of the protective suit 200. The cleaned air supplied to the inside of the protective suit 200 and the discharged air are performed by a micropump unit or the like. That is, the cleaned air is supplied and discharged so that a person can breathe in the inside of the protective suit 200. In addition, in the inside of the housing 90, a carbon dioxide absorbing material capable of processing carbon dioxide discharged by a person due to breathing can be mounted.

[0242] In the present embodiment, the plurality of suction ports 12a and the plurality of discharge ports 52 formed on the back side of the housing 90 are arranged alternately one by one. In addition, the arrangement of the suction ports 12a and the discharge ports 52 is not limited to the present embodiment, and for example, a plurality of suction ports 12a and a plurality of discharge ports 52 can be arranged alternately.

[0243] The display portion 201d is a monitor mounted on the front side of the cover 201. The display portion 201d displays, for example, information of the inside of the cover 201. The information displays, for example, a level of cleaned air in the cover 201, a temperature, a humidity, and a battery level in the cover 201, and the like. The display portion 201d is controlled by the control portion 70 of the air cleaning system 100, and thus displays the information.

[0244] <Effects>

[0245] The effects of the protective suit 200 according to the present embodiment will be described.

[0246] ​As described above, the protective clothing 200 according to the present embodiment includes the air cleaning system 100 and the covering body 201 that covers the surface of the body of the person and in which the air cleaning system 100 is incorporated. The air cleaning system 100 cleans the air taken in from the outside and supplies the cleaned air to the inside of the covering body 201.

[0247] Accordingly, the person can safely move in an environment in which bacteria, viruses, and the like float in the air.

[0248] Further, the same effects as those of the first embodiment are also achieved in the protective clothing 200.

[0249] (Other modifications and the like)

[0250] The present disclosure is not limited to the above-described first to third embodiments.

[0251] For example, in the air cleaning system and the protective clothing using the air cleaning system according to the first to third embodiments, the Q value of the resonator of the linear electrode and the first case is designed to be increased. The Q value of the resonance is determined by the ratio of the resistance of the linear electrode to the resistance of the power supply line (loss of input power).

[0252] For example, in the air cleaning system according to the second embodiment, as shown in Figure 7 the air cleaning system can be configured by the plasma reactor and the first filter unit.

[0253] Further, the present disclosure includes various modifications of the first to third embodiments that can be conceived by those skilled in the art, and a combination of the structural elements and functions of the first to third embodiments in a range not departing from the gist of the present disclosure.

[0254] Industrial applicability

[0255] The air cleaning system and the protective clothing using the air cleaning system according to the present disclosure can be used in an air cleaning machine or the like, or when moving in a region in which bacteria, viruses, and the like spread.

[0256] Explanation of reference numerals

[0257] 1, 100 air cleaning system

[0258] 3a, 3b plasma reactor

[0259] 10 first case (second electrode)

[0260] 10a space

[0261] 12a suction port

[0262] 20 linear electrode (first electrode)

[0263] 30 power supply section

[0264] 36 driver

[0265] 40 electric field probe

[0266] 52 discharge port

[0267] 60 filter

[0268] 70 control section

[0269] 105a first detector

[0270] 200 protective clothing

[0271] 201 cover

[0272] P plasma generation region

Claims

1. An air cleaning system that generates plasma using a voltage, comprising: a first electrode that generates electromagnetic resonance by being supplied with electric power; a second electrode that is configured to surround the first electrode in a state separate from the first electrode; a power supply section that supplies electric power to the first electrode; an electric field probe that measures the strength of an electric field between the first electrode and the second electrode; and a control section that controls the electric power supplied to the first electrode, the control section operating the frequency of the electric power supplied to the first electrode and the position at which the electric power is supplied to the first electrode based on a signal representing the strength of the electric field measured by the electric field probe, thereby performing feedback control so that the 1 / 2 wavelength at which the first electrode electromagnetically resonates becomes the sum of the length of the first electrode and the length of the generated plasma, and the output value of the signal representing the strength of the electric field measured by the electric field probe becomes maximum.

2. The air cleaning system according to claim 1, the control section acquiring, from a detector, a measurement result obtained by measuring the amount of ozone contained in air that has passed between the first electrode and the second electrode, and based on the acquired measurement result, operating the supplied electric power to perform control so that the amount of ozone generated by the generation of plasma is always fixed and becomes an intermediate value of the dissociation energy of oxygen molecules and nitrogen molecules in which nitrogen oxides are not substantially generated.

3. The air cleaning system according to claim 2, the electric power supplied to the first electrode being alternating current power, the control section operating the amplitude of the supplied alternating current power to perform control so that the amount of generated ozone is always fixed.

4. The air cleaning system according to claim 3, the waveform of the alternating current power supplied to the first electrode being a waveform in which a carrier wave is amplitude-modulated, the control section operating the amplitude modulation to perform control so that the amount of generated ozone is fixed.

5. The air cleaning system according to claim 4, the control section operating in a manner in which amplitude modulation is repeated intermittently between a fixed value and zero to perform control so that the amount of generated ozone is fixed.

6. The air cleaning system according to any one of claims 1 to 5, the control section operating the supplied electric power to perform control so that the concentration of generated ozone is 0.1 ppm or less.

7. The air cleaning system according to any one of claims 1 to 5, comprising: a driver that displaces the position of the power supply point at which the power supply section supplies electric power to the first electrode, the control section operating the driver to thereby adjust the position of the power supply point.

8. The air cleaning system according to claim 7, the control section performing control so that the output voltage of the electric field probe becomes maximum by operating both the frequency and the position of the power supply point on the first electrode.

9. The air cleaning system according to any one of claims 1 to 5, the second electrode being a case in which a suction port through which air is sucked in is formed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A filter is provided in the vicinity of an air outlet through which air drawn in from the air inlet is discharged, and removes nitrogen oxides and ozone generated by a plasma reactor having the first electrode and the second electrode when the air drawn in from the air inlet passes therethrough.

10. The air cleaning system according to any one of claims 1 to 5, The first electrode is a long electrode, The second electrode forms a space in which the long first electrode is accommodated along the length direction of the first electrode, A plasma generation region for generating plasma in the space is formed between the air inlet of the second electrode and the first electrode.

11. The air cleaning system according to claim 9, The control section operates the input power to the plasma reactor to impart a dissociation energy to oxygen molecules contained in the air drawn in from the air inlet.

12. The air cleaning system according to any one of claims 1 to 5, Plasma is generated using power in which a carrier wave of 100 MHz to 10 GHz is amplitude-modulated in a manner that makes the amount of ozone generation fixed.

13. A protective suit comprising: The air cleaning system according to any one of claims 1 to 12; and A cover that mounts the air cleaning system and covers the surface of the body of a person, The air cleaning system cleans air drawn in from the outside, and supplies the cleaned air to the inside of the cover.

Images