Plasma-based air purifier

Abstract

A plasma-based air purifier comprises a normal-pressure plasma generating device, a fan module and a shell, the shell is an air flow channel provided with an air inlet and an air outlet for guiding air to enter, and the normal-pressure plasma generating device and the fan module are fixedly arranged in the air flow channel; the normal-pressure plasma generating device comprises a positive electrode part, a negative electrode part, a supporting part and a power supply part, the positive electrode part and the negative electrode part are arranged on the supporting part in a spaced mode, and the supporting part is made of insulating materials. The power supply part is electrically connected with the positive electrode part and the negative electrode part respectively, so that normal-pressure plasma is generated between the positive electrode part and the negative electrode part; and the fan module can guide the air with the normal-pressure plasma in the air flow channel to flow out from the air outlet. The utility model provides an air purifier which is higher in purification effect and safer for an operator.

Description

Technical Field

[0001] This utility model belongs to the field of air purification, specifically relating to a plasma-based air purifier. Background Technology

[0002] Current plasma odor removal devices utilize high voltage to break down air and generate trace amounts of plasma through methods such as brushes and needle tip discharge. During operation, they produce a large number of positive and negative ions, as well as a certain concentration of ozone. However, because the effective range of positive and negative ions is limited and they easily dissipate naturally, they do not have a significant odor removal effect. While ozone does have some effect in decomposing organic odor molecules, its effectiveness diminishes at excessively high concentrations (e.g., ≥ 2 mg / m³). 3 It can cause headaches, chest pain, and decreased cognitive ability; in severe cases, it can lead to emphysema and pulmonary edema. During the operation of the air purifier, personnel and animals need to leave the site, meaning "human-machine coexistence" is impossible. Furthermore, current high-voltage plasma-based air purifiers rely solely on brush or needle-tip discharge, which diffuses freely, resulting in limited effectiveness against the surrounding environment.

[0003] Atmospheric pressure plasma generation technology, as another plasma generation technology, produces significantly less ozone than high-pressure plasma generation technology. However, current applications of atmospheric pressure plasma technology in air purification primarily involve setting corresponding pointed structures on positive and negative electrodes and driving these structures to discharge using pure high-voltage electricity. This process generates a large amount of ozone while simultaneously breaking down the air, making it difficult to achieve "human-machine coexistence" when applied to plasma-based air purifiers. Furthermore, existing atmospheric pressure plasma generators are often quite large, making them unsuitable for small, portable air purification devices such as those for vehicles or desktops. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a plasma-based air purifier, which is an air purifier with higher purification effect and is safer for the operator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a plasma-based air purifier, characterized in that it comprises: an atmospheric pressure plasma generator, a fan module, and a housing, wherein the housing is an airflow channel having an air inlet and an air outlet for guiding air in, and the atmospheric pressure plasma generator and the fan module are fixedly disposed within the airflow channel; the atmospheric pressure plasma generator includes a positive electrode, a negative electrode, a support part, and a power supply part, wherein the positive electrode and the negative electrode are spaced apart on the support part, the support part is composed of insulating material, and the power supply part is electrically connected to the positive electrode and the negative electrode respectively to drive the air between the positive electrode and the negative electrode to ionize and generate atmospheric pressure plasma through pulsed high voltage; the fan module can guide the air carrying the atmospheric pressure plasma in the airflow channel to flow out from the air outlet.

[0006] In one embodiment of this utility model, the negative electrode portion has a hollow cavity; the support portion includes a fixedly disposed support base and a support step that can contact the inner wall of the negative electrode portion, the size of the support base being larger than that of the negative electrode portion; the support base and the support step are provided with mounting holes capable of accommodating the positive electrode portion; wherein; two support portions are disposed on both sides of the negative electrode portion to support the negative electrode portion; the two ends of the positive electrode portion are fixedly connected to the mounting holes of the two support portions.

[0007] In one embodiment of this utility model, the negative electrode portion is provided with a plurality of through holes at intervals; wherein the plurality of through holes are equally spaced, the through holes are circular holes with a diameter of 2 mm and a spacing of 4 mm between each through hole; and / or, the positive electrode portion is made of brass and the negative electrode portion is made of stainless steel.

[0008] In one embodiment of this utility model, the inner diameter of the negative electrode portion is not less than 1 mm and not more than 100.0 mm; the length of the negative electrode portion is not less than 1 mm and not more than 100 mm; the wall thickness of the negative electrode portion is not less than 0.05 mm and not more than 5 mm; and / or, the length of the positive electrode portion is not less than 1 mm and not more than 100 mm; the outer diameter of the positive electrode portion is not less than 1.0 mm and not more than 100 mm.

[0009] In one embodiment of this utility model, the thickness of the support base of the support part is not less than 0.2 mm and not more than 10 mm; the height of the support base and the support step is not less than 0.1 mm and not more than 10 mm; and the diameter of the support step is not less than 0.1 mm and not more than 50 mm.

[0010] In one embodiment of this utility model, the support portion is provided with slots at intervals that can engage with the positive electrode portion and the negative electrode portion, and the positive electrode portion and the negative electrode portion are respectively engaged with the positive electrode portion and the negative electrode portion.

[0011] In one embodiment of this utility model, the positive electrode portion and the negative electrode portion are provided with a plurality of through holes penetrating the negative electrode portion at intervals; wherein the plurality of through holes are equally spaced, the through holes are square holes with a diameter of 36*2mm, and the spacing between each through hole is 4mm; and / or, both the positive electrode portion and the negative electrode portion are made of brass.

[0012] In one embodiment of this utility model, the positive electrode and the negative electrode have the same structure, and the positive electrode and the negative electrode are plate-shaped structures with a length of 40.0 mm, a width of 30.0 mm, and a thickness of 0.8 mm; and / or, the support part is square, and the length of the support part is not less than 1.0 mm and not more than 50.0 mm; the width of the support part is not less than 1.0 mm and not more than 50.0 mm; the thickness of the support part is not less than 0.1 mm and not more than 10.0 mm.

[0013] As one embodiment of this utility model, it also includes an ozone module fixedly disposed in the airflow channel of the housing for selectively generating ozone; a sensing module fixedly disposed on the housing to detect the air quality of the environment in which the plasma-based air purifier is located; a broadcasting module fixedly connected to the housing to selectively broadcast setting information; and a display module fixedly disposed on the housing to display environmental values ​​based on the sensing information of the sensing module. The overall control module is communicatively connected to the ozone module, sensing module, broadcasting module, display module, atmospheric pressure plasma generator, and fan module. The overall control module includes a drive submodule, which is electrically connected to the atmospheric pressure plasma generator to drive the air between the positive and negative electrodes to ionize and generate atmospheric pressure plasma through a pulse voltage. The power pulse frequency of the power supply unit driven by the drive submodule is 20KHz-2MHz, and the duty cycle is 1%-50%.

[0014] As one embodiment of this utility model, the main control module further includes a judgment submodule, which can determine whether the environmental quality meets the requirements. If it does, the atmospheric pressure plasma generator is turned off; if it does not meet the requirements, the ozone module is determined to be activated.

[0015] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0016] 1. This utility model provides a plasma-based air purifier. The device utilizes the ability of high-energy ions in a plasma field to decompose organic gas molecules, achieving a significant deodorization effect without producing ozone or producing only trace amounts of ozone (far below the control values ​​of national indoor air standards), thus solving the problem that pointed discharge plasma devices cannot "coexist with humans" due to ozone production.

[0017] 2. The plasma generation module is miniaturized, with a size of 18*18*40mm, solving the problem that traditional large plasma generators are too bulky and unsuitable for small household appliances, vehicle appliances, etc.

[0018] 3. The plasma-based air purifier is specially designed with air inlet and outlet channels, allowing outside air to circulate over the surface of the plasma generator, thus solving the problems of limited effective range and limited effectiveness of traditional plasma purifiers. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an atmospheric pressure plasma generator according to a specific embodiment of the present invention;

[0021] Figure 2 This is a perspective view of an atmospheric pressure plasma generator according to a specific embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the support part of an atmospheric pressure plasma generator according to a specific embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of another atmospheric pressure plasma generator provided in a specific embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of a plasma-based air purifier provided in a specific embodiment of the present invention;

[0025] Figure 6 This is a cross-sectional schematic diagram of a plasma-based air purifier provided in a specific embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Atmospheric pressure plasma generator; 110. Positive electrode section; 120. Negative electrode section; 121. Through hole; 130. Support section; 131. Support base; 132. Support step; 133. Mounting hole; 140. Power supply section; 150. Control section; 151. Charging port;

[0028] 200. Plasma-based air purifier; 210. Fan module; 220. Display module; 230. Sensor module; 240. Ozone module; 250. Broadcast module; 260. Housing; 261. Air inlet; 262. Air outlet; 270. Central control module. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustration and explanation of the present utility model, and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "up," "down," "left," "right," "front," and "back" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0030] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments of this utility model. Furthermore, the descriptions of each embodiment in the following embodiments have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0031] Please see Figures 1-6 The plasma-based air purifier 200 includes a housing 260, an atmospheric pressure plasma generator 100, a fan module 210, and an ozone module 240. The housing 260 is a hollow cavity to house the atmospheric pressure plasma generator 100, the fan module 210, and the ozone module 240. The housing 260 has an air inlet 261 that guides air into the hollow cavity and an air outlet 262 that guides air out of the hollow cavity. Figure 5 In this specific embodiment, the housing 260 is a rectangular column-like structure. The air inlet 261 is located on the side wall of the housing 260 and is as far away as possible from the air outlet 262. The air outlet 262 is located on the top wall of the housing 260. The fan module 210 guides airflow. The ozone module 240 generates ozone.

[0032] An airflow channel is formed in the hollow cavity of the housing 260 between the air inlet 261 and the air outlet 262. This airflow channel allows gas to enter the cavity from the air inlet 261 and exit from the air outlet 262. The fan module 210, ozone module 240, and plasma generator are disposed in this airflow channel so that the fan module 210, ozone module 240, and plasma generator process the air entering from the air inlet 261 and then exit from the air outlet 262, thereby achieving air purification.

[0033] Correspondingly, the plasma-based air purifier 200 also includes a display module 220, a sensing module 230, a broadcast module 250, and a central control module 270. The central control module 270 is communicatively connected to the atmospheric pressure plasma generator 100, the display module 220, the sensing module 230, and the broadcast module 250, respectively. The broadcast module 250 is located inside the housing 260 of the plasma-based air purifier 200 and is electrically connected to the central control module 270 to emit a set sound when set conditions are met under the control of the control module. For example, when the central control module 270 detects that the ozone module 240 is activated, it controls the broadcast module to periodically play the working status and precautions of the plasma-based air purifier 200 and remind personnel to stay away from the area; or, for example, when the central control module 270 detects that the pollution concentration in the environment is in different ranges according to the sensing module 230, the central control module 270 controls the display module 220 to display different colored lights or directly display the corresponding concentration value; in addition, it can also perform voice broadcasts of working mode, low battery, and other voice broadcasts according to pre-stored content.

[0034] The display module 220 can display the ambient concentration value according to the instructions of the main control module 270. The display module 220 is set on the outer wall of the housing 260, preferably as a light strip, and is fixedly set on the top wall of the housing 260 for easy viewing by the user. Of course, it can also be a digital display module 220 with digital display function.

[0035] The sensing module 230 is fixedly mounted on the outer wall of the housing 260, preferably on the outer side wall. The sensing module 230 can sense the air quality of the environment in which the plasma-based air purifier 200 is located and feed it back to the main control module 270. Preferably, the sensing module 230 can sense the TVOC value in the space.

[0036] Please continue reading. Figures 5-6The fan module 210 is positioned near the air outlet 262, while the ozone module 240 and the atmospheric pressure plasma generator 100 are positioned on the side of the fan module 210 furthest from the air outlet 262 and as close to the fan module 210 as possible. This arrangement allows the fan to efficiently transport the ozone and non-equilibrium plasma generated by the ozone module 240 and the atmospheric pressure plasma generator 100 outside the plasma-based air purifier 200, thereby improving the overall efficiency of the plasma-based air purifier 200. Figure 6 In this specific embodiment, an atmospheric pressure plasma generator 100 is disposed below the fan module 210, and the ozone module 240 is integrated with the side wall of the fan module 210. The advantage of this arrangement is that, considering the low frequency and scenarios of use of the ozone module 240, the distance between the fan module 210 and the atmospheric pressure plasma generator 100 is optimized as much as possible to improve air purification efficiency, thus maximizing the contact area between one end of the fan module 210 and the atmospheric pressure plasma generator 100, thereby improving air purification efficiency.

[0037] The present invention does not limit the positional relationship between the ozone module 240 and the atmospheric pressure plasma generator 100. For example, the ozone module 240 and the atmospheric pressure plasma generator 100 can be arranged on the same horizontal plane; or the ozone module 240 and the atmospheric pressure plasma generator 100 can be arranged vertically, with the ozone module 240 located on the side of the atmospheric pressure plasma generator 100 away from the fan module 210.

[0038] Please see Figures 1-4The figure shows an atmospheric pressure plasma generator 100, including a positive electrode 110, a negative electrode 120, a support 130, a power supply 140, and a control 150. The positive electrode 110 and negative electrode 120 are fixedly mounted on the support 130 and spaced apart. The support 130 is made of insulating material. The positive electrode 110 and negative electrode 120 are electrically connected to the power supply 140, so that the positive electrode 110 becomes a positive electrode when the power supply 140 is turned on, and the negative electrode 120 becomes a negative electrode when the power supply 140 is turned on. The power supply 140 can apply a pulsed high voltage to the positive electrode 110 and negative electrode 120 to ionize the air between the positive and negative electrodes, generating atmospheric pressure plasma. Preferably, the power pulse frequency applied by the power supply 140 to the positive electrode 110 and negative electrode 120 is 20 kHz to 2 MHz, with a duty cycle of 1% to 50%. The control unit 150 is communicatively connected to the power supply unit 140. The control unit 150 can control the power supply unit 140 to independently send alternating current of a set frequency to the positive electrode 110 and the negative electrode 120 under normal pressure, causing the gas between the positive and negative electrodes to break down, thereby forming a non-equilibrium gas discharge and generating a non-equilibrium plasma. The plasma contains a large number of high-energy ions such as electrons and ions. Organic molecules in the gas are decomposed by these high-energy ions within the plasma field, generating harmless substances such as H2O and CO2, thus achieving a deodorizing effect.

[0039] As can be understood, this invention uses a pulsed high-voltage drive to propel the positive and negative electrodes of a plasma generator, ionizing the gas in the space between the electrodes and thus forming a stable high-energy plasma field. External gas, driven by a fan module, reaches the area between the positive and negative electrodes. Odor sources (organic matter) within this gas are decomposed into odorless substances such as CO, CO2, and H2O by high-energy ion bombardment in the high-energy plasma field. Its operation produces almost no ozone while generating a large amount of plasma, and its small size makes it better suited for use in small, portable air purifiers, achieving excellent air purification results.

[0040] In other words, the solution of this application, which uses the control unit 150 to control the power supply unit 140 to independently send alternating current of a set current frequency to the positive electrode 110 and the negative electrode 120 to apply a pulsed high voltage, thereby forming a non-equilibrium gas discharge, has the advantage that, compared with the high-voltage discharge plasma generation scheme in the prior art, the solution provided by this utility model can generate as little ozone as possible, thereby avoiding the impact of ozone on operators. Furthermore, by achieving non-equilibrium gas discharge under normal pressure, ozone can be minimized, thus enabling "human-machine coexistence" in the air purification process and improving the user experience. At the same time, this design can further reduce the size of the positive and negative electrode parts, achieving miniaturization for use in small portable air devices such as those for vehicles and desktops.

[0041] It is understood that the purpose of the support portion 130 is to support the positive electrode portion 110 and the negative electrode portion 120, so that the support portion 130 and the negative electrode portion 120 are arranged at a specific interval. Various materials can be used, and this invention does not limit this choice. For example, the insulating material used to make the support portion 130 can be one or more materials such as nylon, Teflon, ABS, PPA, PPS, PPSU, PP, FR-4, etc. Of course, it is not limited to these materials, and other solutions in the prior art can also be used; this invention does not limit this choice.

[0042] Please continue reading. Figure 5 The control unit 150 and the main control module 270 of the atmospheric pressure plasma generator 100 are integrated into one PCB board, or the control unit 150 is the main control module 270, to reduce the cost of the entire manufacturing process. The main control module 270 is preferably located on the side of the atmospheric pressure plasma generator 100 and the ozone module 240 near the air inlet 261.

[0043] Accordingly, the power supply unit 140 is preferably located on the side of the main control module 270 away from the display module 220. The power supply unit 140 is electrically connected to the fan module 210, display module 220, sensor module 230, ozone module 240, broadcast module 250, and main control module 270 to provide power. Correspondingly, a charging port 151 for charging the power supply unit 140 is provided on the outer wall of the housing 260. The charging port 151 is preferably a Type-C interface.

[0044] Furthermore, the main control module 270 also includes a judgment submodule: the judgment submodule can determine whether the environmental quality meets the requirements, and if it does, shut down the atmospheric pressure plasma generating device; if it does not meet the requirements, it determines whether to start the ozone module 240.

[0045] However, since the non-equilibrium plasma is generated under normal pressure, when the frequency and waveform of the alternating current emitted by the power supply unit 140 to the positive electrode 110 and the negative electrode 120 are constant under the control unit 150, the arrangement of the positive electrode 110 and the negative electrode 120 (including the material selection, distance setting, width and thickness setting of the positive and negative electrode 120) directly affects the effect of the non-equilibrium plasma generated between the positive electrode 110 and the negative electrode 120.

[0046] Based on this, this utility model provides two types of arrangements for the positive electrode portion 110 and the negative electrode portion 120, based on multiple creative attempts, in order to maximize the effect of the generated non-equilibrium plasma.

[0047] Meanwhile, to ensure the rigor of the solution, the inventors conducted tests under identical conditions. Specifically:

[0048] 1) Odor Removal Effect Test Scenario: A sealed box, preferably 50*30*35cm, is constructed to accommodate the atmospheric pressure plasma generator provided by this invention. The sealed box includes a suction port, a vent, an online H2S measuring instrument, and a power supply wire. A 25% sulfuric acid + ferrous sulfide solution is then prepared and placed in a sealed flask and heated to generate H2S gas. The H2S gas in the flask is introduced into the transparent acrylic sealed box through a conduit and inlet. The vent is then opened, and a vacuum pump is used to extract gas from the suction port, adjusting the H2S concentration within the sealed box to the range of 65-85 mmHg. Once the H2S concentration stabilizes, the power supply wire is turned on, and the atmospheric pressure plasma generator or plasma-based air purifier containing an atmospheric pressure plasma generator in the sealed box begins operation. Simultaneously, a PLC recorder is activated, recording the H2S value measured by the online H2S measuring instrument every minute. The test lasts for 2 hours. After the test, the H2S concentration is processed, and the purification efficiency is calculated. The purification efficiency is η = (ρ1 - ρ2) / 120, where η is the odor removal efficiency in ppm / min; ρ1 is the initial concentration of H2S gas; and ρ2 is the concentration of H2S gas at the end of the test (test time 120 min).

[0049] 2) Ozone effect test scenario: Select the sealed box in the (1) odor removal effect test scenario setting. Then use the GT-903 multi-functional gas detector (hereinafter referred to as "ozone concentration detector") of Shenzhen Kern Electronics Technology Co., Ltd. to test whether the atmospheric pressure plasma generator or the plasma-based air purifier containing the atmospheric pressure plasma generator will produce ozone. The specific method is as follows: After the ozone concentration detector is turned on and preheated, place it next to the atmospheric pressure plasma generator or the plasma-based air purifier containing the atmospheric pressure plasma generator in the sealed box; then close the door of the sealed box and close the charging cable switch. After the plasma-based air purifier is powered on, it will automatically turn on and enter the plasma purification mode; after the plasma-based air purifier works for 20 minutes, read the reading on the ozone concentration detector and use it as the amount of ozone produced. The test is carried out in a 50*30*35cm sealed box with an ambient temperature of 22-25℃ and a humidity of 45-75%RH. Example 1

[0050] Please see Figures 1-3The figure shows an atmospheric pressure plasma generator 100, including a positive electrode 110, a negative electrode 120, and a support 130. The negative electrode 120 is a hollow cylindrical structure. The positive electrode 110 is a rod-shaped structure disposed within the cavity of the hollow cylindrical structure of the negative electrode 120. Two support 130s are provided, respectively disposed on both sides of the cavity of the hollow cylinder of the negative electrode 120 to engage with the negative electrode 120, and are provided with through holes for fixing the positive electrode 110. The power supply is a 40kHz frequency, 25% duty cycle drive power supply to drive the positive electrode 110 and the negative electrode 120.

[0051] Specifically, the support portion 130 includes a mounting hole 133, a fixedly disposed support base 131, and a support step 132. The support base 131 and the support step 132 are preferably integrally formed. The radial dimension of the support base 131 is larger than the radial dimension of the support step 132, thus forming a stepped structure. The radial dimension of the support base 131 is larger than the outer diameter of the negative electrode portion 120 to limit the negative electrode portion 120. The radial dimension of the support step 132 is the same as or slightly smaller than the inner wall of the negative electrode portion 120, allowing the support step 132 to be precisely accommodated within the hollow cavity of the negative electrode portion 120 and to contact the inner wall of the negative electrode portion 120, thereby supporting the negative electrode portion 120. Two support portions 130 are respectively disposed at the openings on both sides of the negative electrode portion 120, and the two sides of the negative electrode portion 120 are respectively engaged with the two sides of the support portion 130, thereby fixing the negative electrode portion 120.

[0052] The positive electrode 110 is a rod-shaped structure. The positive electrode 110 passes through one of the two support portions 130 and exits from the other support portion 130, thereby fixing the support portion 130 to the positive electrode 110.

[0053] The negative electrode 120 is provided with a plurality of through holes 121. By providing through holes 121, it can cooperate with the fan module 210 to better propagate the non-equilibrium gas ions generated between the positive electrode 110 and the negative electrode 120 to the designated location.

[0054] The sleeve-shaped negative electrode portion 120 has a length L1 of 40 mm, an inner diameter Ø1 of 15.0 mm, and a thickness H1 of 0.5 mm. The surface of the negative electrode portion 120 has multiple circular through holes 121. The diameter Ø3 of each circular through hole 121 is 2.0 mm, and the hole spacing L3 is 4.0 mm. The multiple circular holes are equidistantly arranged. The negative electrode portion 120 is preferably made of stainless steel. The connection between the negative electrode portion 120 and the power supply portion 140 is a mechanical press-fit connection. The negative electrode connection wire between the negative electrode portion 120 and the power supply portion 140 has a withstand voltage of 600 kV.

[0055] The rod-shaped positive electrode portion 110 has a diameter Ø2 of 0.8 mm and a length L2 of 43.5 mm. The positive electrode portion 110 is preferably made of brass. The connection between the positive electrode portion 110 and the power supply portion 140 is a solder connection. The withstand voltage of the connection wire between the positive electrode portion 110 and the positive power supply is 15.0 kV, and the input voltage of the power supply portion 140 is 12.0 V, DC.

[0056] The support base and support step of the support part are circular structures. The outer diameter of the support base is Ø4, which is 18.0 mm. The outer diameter of the support step is Ø5, which is 15.05 mm. The diameter of the mounting hole opened in the center of the support part is Ø6, which is 0.9 mm.

[0057] After testing in odor removal and ozone removal scenarios, the power supply output high voltage was measured at 5.76KV, the H2S purification efficiency was measured at 0.16ppm / min and the O3 concentration at 0.02ppm within 2 hours.

[0058] It is understandable that the materials used to prepare the positive and negative electrodes can be varied, such as copper, iron, aluminum and their alloys, or stainless steel.

[0059] Similarly, for the sleeve-shaped negative electrode part, its inner diameter Ø1 can be 1.0≤Ø1≤100.0mm, its length L1 can be 1.0≤L1≤100.0mm, its wall thickness H1 can be 0.05≤H1≤5.0mm, the opening diameter Ø3 of the through hole opened on the surface is 0.1≤Ø3≤10.0mm, and the hole spacing L3 of multiple through holes is 0.1≤L3≤50.0mm.

[0060] Similarly, for the rod-shaped positive electrode portion, its length L2 is preferably 1.0≤L2≤100.0mm, and its outer diameter Ø2 is preferably 1.0≤Ø2≤100.0mm.

[0061] Similarly, the support portion can be a circular, square, or other stepped structure. The thickness H2 of the support base is 0.2 ≤ H2 ≤ 10 mm. The height H3 of the support base and the support step is 0.2 ≤ H3 ≤ 12.0 mm, and the diameter Ø5 of the support step is 0.1 ≤ Ø5 ≤ 50.0 mm. This allows the support step to be embedded and secured within the inner wall of the negative electrode. A mounting hole is provided in the middle of the support portion, with a diameter Ø6 of 0.1 ≤ Ø6 ≤ 30.0 mm. The rod-shaped positive electrode portion passes through the mounting holes of the two positive electrode portions and is secured, thus fixing the support portion to the positive and negative electrode portions.

[0062] To further illustrate the superiority of this solution, a comparative explanation is provided below:

[0063] Example 11: This example differs from Example 1 in that the diameter of the mounting holes on the surface of the negative electrode is Ø3=3.0mm, the hole spacing is L3=6.0mm, and they are equidistant.

[0064] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output voltage was 6.23KV, the H2S purification efficiency was 0.29ppm / min, and the O3 concentration was 0.08ppm within 2 hours.

[0065] Example 12: This example differs from Example 1 in that the power input voltage is 3.7VDC.

[0066] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 3.25KV, the H2S purification efficiency was 0.09ppm / min, and the O3 concentration was 0.00ppm within 2 hours.

[0067] Example 13: This example differs from Example 1 in that the power input voltage is 5.0VDC.

[0068] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output voltage was 4.36KV, the H2S purification efficiency was 0.12ppm / min, and the O3 concentration was 0.01ppm within 2 hours. Example 2

[0069] Please see Figure 4 The figure shows an atmospheric pressure plasma generator 100, including a positive electrode 110, a negative electrode 120, and a support 130. The positive electrode 110 and the negative electrode 120 have the same structure and are both sheet-like. The support 130 is provided with a slot that can engage with the positive electrode 110 and the negative electrode 120. The positive electrode 110 and the negative electrode 120 are preferably made of brass, and each has a length of 40.0 mm, a width of 30.0 mm, and a thickness of 0.8 mm. Multiple regularly distributed square holes, each 30*2 mm in size, are formed on the surface of the positive electrode 110 and the negative electrode 120. The square holes are evenly spaced, with a hole spacing of 4.0 mm. The distance between the positive electrode 110 and the negative electrode 120 is 8.0 mm. The power supply unit is a 40kHz frequency, 25% duty cycle drive power supply to drive the positive terminal 110 and the negative terminal 120.

[0070] The positive terminal 110, negative terminal 120, and power supply unit 140 are connected by wires. The wires are soldered to the power input points of the positive terminal 110 and negative terminal 120. The withstand voltage of the positive power supply connection wire connecting the positive terminal 110 and power supply unit 140 is no less than 15.0 kV, and the withstand voltage of the negative power supply connection wire connecting the negative terminal 120 and power supply unit 140 is no less than 600 kV. The power input voltage of power supply unit 140 is 12.0 V, DC.

[0071] Through testing in odor removal and ozone removal scenarios, the power supply output voltage was measured at 5.93KV, and the H2S purification efficiency was measured at 0.23ppm / min and the O3 concentration at 0.12ppm within 2 hours. The effect is good, effectively meeting air purification requirements while producing relatively little ozone.

[0072] It is understandable that the materials used to prepare the positive electrode portion 110 and the negative electrode portion 120 can be of various types, such as copper, iron, aluminum and their alloys, or stainless steel.

[0073] Similarly, the lengths of the positive and negative electrode portions can be set in various ways. The preferred length L7 of the positive and negative electrode portions is 1.0≤L7≤500.0mm; the width W7 of the positive and negative electrode portions is 1.0≤W7≤100.0mm; and the thickness H7 of the positive and negative electrode portions is 1.0≤H7≤10.0mm.

[0074] Similarly, the positive and negative electrode sections may have no holes or multiple holes, which can be round or square. When round holes are used, the diameter of the round hole is Ø7: 0.1≤Ø7≤10.0mm, the hole spacing in the X direction L10: 0.1≤L10≤50.0mm, and the hole spacing in the Y direction L10: 0.1≤L11≤50.0mm. When square holes are used, the length of the square hole L8: 0.1≤L8≤490.9mm, the width of the square hole W8: 0.1≤W8≤99.9mm, the hole spacing in the X direction L9: 1.0≤L6≤30.0mm, and the hole spacing in the Y direction is 0-100mm.

[0075] At this point, the support part is preferably configured as a square plug or other shaped insulating plastic block. When the support part is square, its length L12 is 1.0 ≤ L12 ≤ 50.0 mm; its width W12 is 1.0 ≤ W12 ≤ 50.0 mm; and its thickness H12 is 0.1 ≤ H12 ≤ 10.0 mm. The support part has grooves on its surface, with a groove width L13 of 0.5 ≤ L13 ≤ 10.0 mm and a groove depth L17 of 0.1 ≤ L17 ≤ 10.0 mm. The number of grooves is one or more, and the groove spacing L15 is 0.1 ≤ L15 ≤ 30.0 mm. The sheet-shaped positive and negative electrodes can be inserted into the grooves and secured, completing the assembly of the atmospheric pressure plasma generator.

[0076] Example 21: This comparative example differs from Example 2 in that the distance between the positive electrode and the negative electrode is 5.0 mm.

[0077] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.46KV, the H2S purification efficiency was 0.16ppm / min, and the O3 concentration was 0.11ppm within 2 hours.

[0078] Example 22: This comparative example differs from Example 2 in that the diameter of the hole on the surface of the negative electrode sleeve is Ø3=5.0mm, the hole spacing is L3=8.0mm, and they are equidistant.

[0079] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.72KV, the H2S purification efficiency was 0.07ppm / min, and the O3 concentration was 0.10ppm within 2 hours.

[0080] Example 23: This comparative example differs from Example 2 in that the positive electrode surface is not perforated.

[0081] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.48KV, the H2S purification efficiency was 0.13ppm / min, and the O3 concentration was 0.06ppm within 2 hours.

[0082] Example 24: This comparative example differs from Example 2 in that the negative electrode surface has no holes.

[0083] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.52KV, the H2S purification efficiency was 0.14ppm / min, and the O3 concentration was 0.05ppm within 2 hours.

[0084] Example 25: This comparative example differs from Example 2 in that neither the positive nor negative electrode surfaces have holes.

[0085] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.05KV, the H2S purification efficiency was 0.07ppm / min, and the O3 concentration was 0.01ppm within 2 hours.

[0086] Example 26: This comparative example differs from Example 2 in that the distance between the positive electrode and the accessory, L15, is 10.0 mm.

[0087] Through tests in odor removal and ozone removal scenarios, it was found that the power supply output high voltage was 5.08KV, the H2S purification efficiency was 0.12ppm / min, and the O3 concentration was 0.00ppm within 2 hours.

[0088] Example 27: The difference between this comparative example and Example 2 is that the input voltage of the power supply is 0V, that is, the odor removal module is not turned on.

[0089] Through tests in odor removal and ozone removal scenarios, it was found that with a power output voltage of 0.0KV, the H2S purification efficiency was 0.04ppm / min and the O3 concentration was 0.00ppm within 2 hours.

[0090] The present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

[0091] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0092] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0093] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

Claims

1. A plasma-based air purifier, characterized by, The application relates to a normal-pressure plasma generating device, a fan module and a shell, wherein the shell is an air flow channel with an air inlet and an air outlet for guiding air into the shell, the normal-pressure plasma generating device and the fan module are fixedly arranged in the air flow channel; the normal-pressure plasma generating device comprises a positive electrode part, a negative electrode part, a support part and a power supply part, the positive electrode part and the negative electrode part are arranged on the support part in a spaced mode, the support part is composed of an insulating material, and the power supply part is electrically connected with the positive electrode part and the negative electrode part respectively to drive air ionization between the positive electrode part and the negative electrode part by pulse high pressure to generate normal-pressure plasma; the fan module can guide air with the normal-pressure plasma in the air flow channel to flow out from the air outlet. The negative electrode part has a hollow cavity; the support part comprises a fixedly arranged support base and a support step capable of being in contact with the inner wall of the negative electrode part, and the size of the support base is larger than that of the negative electrode part; mounting holes capable of accommodating the positive electrode part are arranged on the support base and the support step; Two support parts are arranged on the two sides of the negative electrode part to support the negative electrode part; and the two ends of the positive electrode part are fixedly connected with the mounting holes of the two support parts. A plurality of through holes penetrating through the negative electrode part are arranged on the negative electrode part in a spaced mode; wherein 2. The plasma-based air purifier of claim 1, wherein, The plurality of through holes are arranged at equal intervals, the through holes are circular holes, the diameter of the through holes is 2 mm, and the interval between the through holes is 4 mm; and / or the positive electrode part is made of brass, and the negative electrode part is made of stainless steel. The inner diameter of the negative electrode part is not less than 1 mm and not more than 100.0 mm; the length of the negative electrode part is not less than 1 mm and not more than 100 mm; and the wall thickness of the negative electrode part is not less than 0.05 mm and not more than 5 mm. And / or, the length of the positive electrode part is not less than 1 mm and not more than 100 mm; and the outer diameter of the positive electrode part is not less than 1.0 mm and not more than 100 mm.

3. The plasma-based air purifier of claim 2, wherein, The thickness of the support base of the support part is not less than 0.2 mm and not more than 10 mm; the height of the support base and the support step is not less than 0.1 mm and not more than 10 mm; and the diameter of the support step is not less than 0.1 mm and not more than 50 mm. A clamping groove capable of clamping the positive electrode part and the negative electrode part is arranged on the support part in a spaced mode, and the positive electrode part and the negative electrode part are clamped with the clamping groove respectively.

4. The plasma-based air purifier of claim 2, wherein, A plurality of through holes penetrating through the negative electrode part are arranged on the positive electrode part and the negative electrode part in a spaced mode; wherein The plurality of through holes are arranged at equal intervals, the through holes are square holes, the diameter of the square holes is 36*2 mm, and the interval between the through holes is 4 mm; and / or the positive electrode part and the negative electrode part are both made of brass.

5. The plasma-based air purifier of claim 2, wherein, The positive electrode part and the negative electrode part have the same structure, and the positive electrode part and the negative electrode part are plate-shaped structures with a length of 40.0 mm, a width of 30.0 mm and a thickness of 0.8 mm.

6. The plasma-based air purifier of claim 1, wherein, ​ 7. The plasma-based air purifier of claim 6, wherein, ​ ​ 8. The plasma-based air purifier of claim 6, wherein, ​ And / or, the support part is square, the length of the support part is not less than 1.0 mm, and not more than 50.0 mm; the width of the support part is not less than 1.0 mm, and not more than 50.0 mm; the thickness of the support part is not less than 0.1 mm, and not more than 10.0 mm.

9. The plasma-based air cleaner of any of claims 1-8, wherein, Also include An ozone module is fixedly arranged in the air flow channel of the shell for selectively generating ozone; An induction module is fixedly arranged on the shell to detect the air quality of the environment in which the plasma-based air purifier is located; A broadcast module is fixedly connected with the shell to selectively broadcast setting information; A display module is fixedly arranged on the shell to display environmental values based on the sensing information of the induction module A total control module is in communication connection with the ozone module, the induction module, the broadcast module, the display module, the normal-pressure plasma generating device and the fan module; wherein The total control module includes a driving submodule, which is in electrical connection with the normal-pressure plasma generating device to drive the air between the positive electrode part and the negative electrode part to generate normal-pressure plasma by pulsed voltage ionization, and the power pulse frequency of the driving power supply part of the driving submodule is 20KHz-2MHz, and the duty cycle is 1%-50%.

10. The plasma-based air purifier of claim 9, wherein, The total control module further includes a judgment submodule, which can judge whether the environmental quality meets the requirements, and if it meets the requirements, the normal-pressure plasma generating device is closed; if it does not meet the requirements, it is judged whether to start the ozone module.

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