An ion plasma disinfection and purification module for air disinfection and purification equipment

Abstract

The invention discloses an ion plasma disinfection and purification module for air disinfection and purification equipment, relating to the field of ion disinfection and purification technology. The technical key points include two mounting seats, an ion plasma generator is installed between the two mounting seats, and a mounting cover is covered on the top of the mounting seat. The ion plasma generator includes a metal sheet layer A, a first glass layer, a high-voltage composite sheet layer, a second glass layer and a metal sheet layer B arranged in sequence; the high-voltage composite sheet layer is composited with a titanium alloy sheet and a PZT green sheet, and the PZT green sheet and the titanium alloy sheet are obtained by hot pressing at a temperature of 850°C and a pressure of 10MPa. The thickness of the titanium alloy sheet and the green sheet is not more than 0.1mm. The technical effect adopts a high-voltage composite sheet design, cooperates with a 12kV resonant voltage to excite 20kHz ultrasonic waves, forms an acoustic-electric coupled ionization field, greatly improves the concentration of negative oxygen ions, and at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of ion disinfection and purification, and in particular to an ion plasma disinfection module for air disinfection and purification equipment. Background Art

[0002] Ion disinfection and purification utilizes active substances generated by air ionization, such as negative oxygen ions and reactive oxygen species, to destroy microbial structures, decompose gaseous pollutants, and achieve deep air purification. Dielectric barrier discharge (DBD) technology, due to its simple structure and lack of ozone byproducts, has become a core solution for negative oxygen ion generators. Traditional DBD generators consist of a high-voltage electrode, a ground electrode, and a dielectric layer. The topology of the high-voltage electrode directly determines discharge efficiency. Early flat electrodes, while uniform, suffered from insufficient ion yields. Sawtooth electrodes (such as JP Patent Publication No. 8-222180) utilize the tip effect to increase local electric field strength, achieving negative oxygen ion concentrations exceeding 5 million / cm³.

[0003] However, in order to maintain stable discharge, a high-voltage power supply needs to be applied, resulting in excessive power consumption of the system, and the recombination rate of negative oxygen ions with positive ions during the diffusion process is too high, causing the concentration of negative oxygen ions to decrease. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides an ion plasma disinfection and purification module for air disinfection and purification equipment, which simultaneously achieves a significant reduction in breakdown voltage, an improvement in ion directional transport efficiency and negative oxygen ion concentration without the need for external complex components.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an ion plasma disinfection and purification module for air disinfection and purification equipment, comprising two mounting seats, an ion plasma generator mounted between the two mounting seats, a mounting cover plate covering the top of the mounting seats, the ion plasma generator comprising a metal sheet layer A, a first glass layer, a high-voltage composite sheet layer, a second glass layer, and a metal sheet layer B arranged in sequence;

[0006] The high-pressure composite sheet layer is a composite of a titanium alloy sheet and a PZT green sheet, which is obtained by hot pressing the PZT green sheet and the titanium alloy sheet at a temperature of 850°C and a pressure of 10MPa. The thickness of the titanium alloy sheet and the green sheet is no more than 0.1mm.

[0007] Preferably, the metal sheet layer A and the metal sheet layer B are low-voltage electrodes, and the first glass layer and the second glass layer are dielectric barrier layers.

[0008] Preferably, the metal sheet layer A and the metal sheet layer B are made of stainless steel having a honeycomb periodic structure pattern with regular hexagonal honeycomb holes, and the thickness is not greater than 0.2 mm.

[0009] Preferably, the titanium alloy sheet is provided with a honeycomb periodic structure pattern of cross-shaped honeycomb holes.

[0010] Preferably, the thickness of the first glass layer and the second glass layer is not greater than 0.3 mm.

[0011] An ion plasma generation method for an ion plasma disinfection and purification module specifically comprises the following steps:

[0012] Step 1: Apply a 12kV resonant voltage to the high-voltage composite layer, causing the PZT layer to generate 20kHz ultrasonic waves;

[0013] Ultrasonic waves pass through the cross-shaped honeycomb holes of the titanium alloy sheet to form a standing wave array, generating a sound pressure of >100MPa at the hole edge, achieving air pre-ionization;

[0014] Step 2: The regular hexagonal honeycomb holes of the metal sheet layer A and the metal sheet layer B are aligned with the cross honeycomb holes of the high-voltage composite layer of the high-voltage layer at an overlap rate of 15%-20% to form a discharge channel. The edges of the cross holes generate micro-discharge points under the action of the acoustic field.

[0015] Step 3: The discharge area is constrained by the first glass layer and the second glass layer to prevent arcing. The ultrasonic wave generated by the PZT drives the negative oxygen ions to form an ion plasma beam.

[0016] Compared with the existing technology, the present invention provides an ion plasma disinfection and purification module for air disinfection and purification equipment, which has the following beneficial effects: it adopts a high-voltage composite sheet design of "titanium alloy cross honeycomb holes + PZT piezoelectric ceramic composite layer", and uses a 12kV resonant voltage to excite 20kHz ultrasonic waves to form an acoustic-electric coupled ionization field, which greatly increases the concentration of negative oxygen ions. At the same time, the 15%-20% interlayer overlap rate accurately matches the discharge channel, achieving a significant increase in the sterilization rate and formaldehyde decomposition rate;

[0017] The dielectric barrier effectively constrains the discharge area, and combined with the energy focusing characteristics of the resonant voltage, the ozone concentration is controlled within a low range and the energy consumption is significantly reduced;

[0018] PZT ultrasonic waves drive negative oxygen ions to form a directional beam, and the ion range is longer, greatly expanding the air purification coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 An exploded view of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the high-voltage metal sheet layer in an embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the high-voltage metal sheet layer in Comparative Example 1 of the present invention;

[0023] Figure 5 Schematic diagram of the structure of the high-voltage metal sheet layer in comparative example 2 of the present invention.

[0024] In the figure: 1. Mounting seat; 11. Mounting cover; 12. Connection port;

[0025] 2. Ion plasma generator; 21. Metal sheet layer A; 22. First glass layer; 23. High-voltage composite sheet; 24. Second glass layer; 25. Metal sheet layer B. DETAILED DESCRIPTION

[0026] In the present invention, unless otherwise specified, directions such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0027] Test reference standards and detailed steps:

[0028] 1. Test environment and basic conditions

[0029] Sealed test chamber: volume 10m³ (length 2m × width 2m × height 2.5m), inner wall treated with antistatic and low adsorption treatment;

[0030] Environmental control: temperature 25℃±2℃, relative humidity 50%±10%, background negative oxygen ions ≤100 / cm³, ozone ≤0.001ppm, initial formaldehyde concentration is configured as needed (deducted from the background value in the blank chamber);

[0031] Equipment pretreatment: Preheat the module for 30 minutes to ensure stable performance.

[0032] 2. Test plan for each indicator

[0033] Negative oxygen ion concentration (10,000 / cm³)

[0034] Reference standard: LY / T2586-2016 "Technical Specifications for Observation of Negative Oxygen Ion Concentration in Forests"

[0035] GB / T18801-2015 Air Purifier

[0036] Test steps:

[0037] The module is placed in the center of the cabin and runs stably for 30 minutes;

[0038] Use an air ion counter (such as COM-3200PRO, with a resolution of 10 ions / cm³ and an accuracy of ±5%), and evenly select five test points (with a spacing of 0.2 meters) 1 meter in front of the module. Test each point continuously for 10 seconds and take the average value.

[0039] The ambient temperature and humidity were recorded simultaneously, and the background negative oxygen ion concentration in the cabin (blank cabin test value) was deducted.

[0040] Ozone concentration (ppm)

[0041] Reference standard: GB / T18204.27-2000 "Determination of ozone in air in public places"

[0042] GB21551.3-2010 "Special requirements for air purifiers with antibacterial, sterilization and purification functions for household and similar electrical appliances"

[0043] Test steps:

[0044] After the module has been running for 60 minutes, use an ultraviolet absorption ozone analyzer (such as Model 106L, accuracy ±0.001ppm);

[0045] Samples were collected at three locations in the cabin (near the module, in the center of the cabin, and away from the module), with each location sampling for 10 minutes and the average concentration taken.

[0046] Blank control: Turn off the module under the same environment, test the background ozone concentration, and deduct the background value when calculating.

[0047] Energy consumption (W)

[0048] Reference Standard: GB17167-2006 "Implementation Rules for Energy Efficiency Labeling of Energy-Using Products" (General Method for Power Testing)

[0049] Test steps:

[0050] Connect the module to a digital power meter (such as UT231, with an accuracy of ±0.1W), set the input voltage to 220V±5% and the frequency to 50Hz;

[0051] After 60 minutes of stable operation, record the average input power and deduct the standby power consumption of the test system (if any).

[0052] Sterilization rate (%, taking Escherichia coli ATCC25922 as an example)

[0053] Reference standards:

[0054] GB21551.3-2010

[0055] GB / T38504-2020 Test method for sterilization performance of air purifiers

[0056] Test steps:

[0057] Preparation of bacterial solution: E. coli was cultured to the logarithmic phase and the concentration was adjusted to 10 6 CFU / mL, and evenly released into the cabin through the atomizer, so that the bacterial concentration in the cabin reaches 10 5 CFU / m³;

[0058] After the module has been running for 120 minutes, use an impact sampler (such as MAS-100NT) to collect air from the cabin, inoculate it onto LB agar medium, and incubate it at 37°C for 24 hours. Count the number of colonies.

[0059] Blank group: Under the same conditions, the module was turned off, the bacterial count was collected, and the sterilization rate was calculated:

[0060] First, obtain the number of bacterial colonies in the blank group (when the module is not turned on), then obtain the number of bacterial colonies after the module is running, divide the difference between the two by the number of colonies in the blank group, and finally multiply by 100%.

[0061] Formaldehyde decomposition rate (%)

[0062] Reference standards:

[0063] GB / T18883-2002 "Indoor Air Quality Standard" (Phenol Reagent Spectrophotometry);

[0064] GB / T18801-2015;

[0065] Test steps:

[0066] Formaldehyde gas was injected into the chamber to an initial concentration of 1.0 mg / m³ and the chamber was sealed and equilibrated for 2 hours;

[0067] After the module has been running for 180 minutes, use an atmospheric sampler (such as QC-1B) to collect air from the cabin, and then use a phenol reagent to absorb the formaldehyde concentration using a spectrophotometer (such as UV-1800).

[0068] Blank group: Turn off the module under the same environment, measure the residual concentration, and calculate the decomposition rate:

[0069] First, measure the initial formaldehyde concentration before the experiment, then measure the residual formaldehyde concentration after the module is running. Divide the difference between the initial concentration and the residual concentration by the initial concentration, and finally multiply by 100%.

[0070] Ion range (m, verification method)

[0071] Reference logic: The effective ion action distance is defined as the maximum distance when the concentration of negative oxygen ions drops to 10% of the background value;

[0072] Test steps:

[0073] Place test points in a straight line in front of the module with a spacing of 0.5m (0.5m, 1.0m, 1.5m... up to 5.0m or more);

[0074] After the module has been running for 60 minutes, the concentration of negative oxygen ions at each point is tested using an ion counter;

[0075] Background concentration test: Test the natural ion concentration in an area far away from the module (10m), recorded as B;

[0076] Range determination: Find the maximum distance D so that the concentration C at that point is ≥ 0.1×B, and record D as the ion range.

[0077] Table 1 shows the test related equipment and key performance parameters

[0078]

[0079] It should be noted that the equipment model and testing method are not specifically limited. During implementation, those skilled in the art only need to use equipment that can achieve the corresponding functions.

[0080] See also Figure 1-Figure 5 The present invention provides a technical solution for an ion plasma disinfection and purification module for air disinfection and purification equipment:

[0081] Example 1, reference Figure 1-Figure 3 , an ion plasma disinfection and purification module for air disinfection and purification equipment, comprising two mounting seats 1, an ion plasma generator 2 is installed between the two mounting seats 1, a mounting cover 11 is covered on the top of the mounting seat 1, and a connection port 12 is provided on one side of one of the mounting seats 1 for connecting to a power supply to meet power supply requirements. It should be noted that the power supply can be selected according to the needs of those skilled in the art. This application will be described in detail. The ion plasma generator 2 includes a metal sheet layer A21, a first glass layer 22, a high-voltage composite sheet layer 23, a second glass layer 24, and a metal sheet layer B25 arranged in sequence;

[0082] The high-pressure composite sheet 23 is a composite of a titanium alloy sheet and a PZT green sheet, which is obtained by hot pressing the PZT green sheet and the titanium alloy sheet at a temperature of 850°C and a pressure of 10 MPa. The thickness of the titanium alloy sheet and the green sheet is no more than 0.1 mm.

[0083] PZT lead zirconate titanate is a piezoelectric ceramic material composed of lead Pb, zirconium Zr, titanium Ti and oxygen O elements;

[0084] The metal sheets A21 and B25 serve as low-voltage electrodes, and the first and second glass layers 22 and 24 serve as dielectric barriers. The metal sheets A21 and B25 are made of stainless steel with a honeycomb periodic structure pattern of regular hexagonal honeycomb cells, with a thickness of no more than 0.2 mm. The honeycomb periodic structure pattern of the regular hexagonal honeycomb cells specifically comprises rectangular areas spaced apart, each of which has regular hexagonal honeycomb cells.

[0085] A honeycomb periodic structure pattern with cross-shaped honeycomb holes is provided on the titanium alloy sheet, specifically, rectangular areas are provided at intervals on the titanium alloy sheet, and cross-shaped honeycomb holes are opened in the rectangular areas;

[0086] The thickness of the first glass layer 22 and the second glass layer 24 is no greater than 0.3 mm.

[0087] Further: the ion plasma generation method specifically comprises the following steps:

[0088] Step 1: Apply a 12kV resonant voltage to the high-voltage composite layer 23 to make the PZT layer generate 20kHz ultrasonic waves;

[0089] Ultrasonic waves pass through the cross-shaped honeycomb holes of the titanium alloy sheet to form a standing wave array, generating a sound pressure of >100MPa at the hole edge, achieving air pre-ionization;

[0090] Step 2: The regular hexagonal honeycomb holes of the metal sheet layer A21 and the metal sheet layer B25 are aligned with the cross honeycomb holes of the high-voltage composite layer 23 of the high-voltage layer at an overlap rate of 15% to form a discharge channel. The edges of the cross holes generate micro-discharge points under the action of the acoustic field.

[0091] Step 3: The discharge area is confined by the first glass layer 22 and the second glass layer 24 to prevent arcing. The ultrasonic wave generated by the PZT drives the negative oxygen ions to form an ion plasma beam.

[0092] Example 2, reference Figure 1-Figure 3 , the ion plasma generation method specifically comprises the following steps:

[0093] Step 1: Apply a 12kV resonant voltage to the high-voltage composite layer 23 to make the PZT layer generate 20kHz ultrasonic waves;

[0094] Ultrasonic waves pass through the cross-shaped honeycomb holes of the titanium alloy sheet to form a standing wave array, generating a sound pressure of >100MPa at the hole edge, achieving air pre-ionization;

[0095] Step 2: The regular hexagonal honeycomb holes of the metal sheet layer A21 and the metal sheet layer B25 are aligned with the cross honeycomb holes of the high-voltage composite layer 23 of the high-voltage layer at an overlap rate of 18% to form a discharge channel. The edges of the cross holes generate micro-discharge points under the action of the acoustic field.

[0096] Step 3: The discharge area is confined by the first glass layer 22 and the second glass layer 24 to prevent arcing. The ultrasonic wave generated by the PZT drives the negative oxygen ions to form an ion plasma beam.

[0097] The rest is the same as in Example 1.

[0098] Example 3, reference Figure 1-Figure 3 , the ion plasma generation method specifically comprises the following steps:

[0099] Step 1: Apply a 12kV resonant voltage to the high-voltage composite layer 23 to make the PZT layer generate 20kHz ultrasonic waves;

[0100] Ultrasonic waves pass through the cross-shaped honeycomb holes of the titanium alloy sheet to form a standing wave array, generating a sound pressure of >100MPa at the hole edge, achieving air pre-ionization;

[0101] Step 2: The regular hexagonal honeycomb holes of the metal sheet layer A21 and the metal sheet layer B25 are aligned with the cross honeycomb holes of the high-voltage composite layer 23 at a 20% overlap rate to form a discharge channel. The edges of the cross holes generate micro-discharge points under the action of the acoustic field.

[0102] Step 3: The discharge area is confined by the first glass layer 22 and the second glass layer 24 to prevent arcing. The ultrasonic wave generated by the PZT drives the negative oxygen ions to form an ion plasma beam.

[0103] The rest is the same as in Example 1.

[0104] Comparative Example 1: The high-pressure composite sheet 23 is replaced by a honeycomb periodic structure pattern with regular hexagonal honeycomb holes at the titanium alloy sheet. Figure 4 , and the rest are the same as in Example 1.

[0105] Comparative Example 2: The high-pressure composite sheet 23 is replaced by a honeycomb periodic structure pattern with regular octagonal honeycomb holes at the titanium alloy sheet. Figure 5 , and the rest are the same as in Example 1.

[0106] In comparative example 3, a 12 kV high-frequency AC voltage is applied to the high-voltage composite sheet layer 23 , and the rest is the same as in embodiment 1.

[0107] In comparative example 4, the regular hexagonal honeycomb cells of the metal sheet layer A21 and the metal sheet layer B25 are aligned with the cross honeycomb cells of the high-pressure composite sheet layer 23 of the high-pressure layer at an overlap rate of 10%, and the rest are the same as in embodiment 1.

[0108] In comparative example 5, the high-pressure composite sheet layer (23) is replaced with a titanium alloy sheet having a thickness not greater than 0.2 mm, and the rest is the same as in example 1.

[0109] For comparative example 6, a common ion plasma disinfection purifier on the market was selected, specifically the Boco BKZII-B-800-D.

[0110] The ion plasma disinfection and purification modules obtained in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5 and 6 were grouped and numbered as LZJ-MZ25-01, LZJ-MZ25-02, LZJ-MZ25-03, LZJ-MZ25-04, LZJ-MZ25-05, LZJ-MZ25-06, LZJ-MZ25-07, LZJ-MZ25-08 and LZJ-MZ25-09, and the air purification performance of the products in the embodiments and comparative examples was tested, including the negative oxygen ion concentration (10,000 / cm³), ozone concentration (ppm), energy consumption (W), sterilization rate (%), formaldehyde decomposition rate (%) and ion range (m). The specific test results are shown in Tables 2, 3 and 4.

[0111] Table 2

[0112]

[0113] Table 3

[0114]

[0115] Table 4

[0116]

[0117] In the embodiment, the high-voltage composite sheet uses a titanium alloy cross honeycomb hole + PZT piezoelectric ceramic composite layer. The negative oxygen ion concentration of Comparative Example 1 (regular hexagonal hole), Comparative Example 2 (regular octagonal hole) and Comparative Example 5 (pure titanium alloy sheet) is only 7.2 million to 13.2 million / cm³, while that of the embodiment reaches 24.5 million to 26.8 million / cm³. It can be seen that the ultrasonic wave forms a standing wave array through the cross hole, and the hole edge generates a high sound pressure of >100 MPa, achieving "efficient pre-ionization" of the air, solving the problem of insufficient pre-ionization and lack of negative oxygen ions.

[0118] PZT is excited by the resonant voltage to generate 20kHz ultrasonic waves, which work together with the titanium alloy cross hole to construct an "acoustic-electric coupled ionization field", which is far superior to pure metal sheets. In comparison, Example 5 without PZT has only 7.2 million negative oxygen ions / cm³ and energy consumption as high as 55.6W.

[0119] Comparative Example 3 uses "12kV high-frequency AC voltage". Although the negative oxygen ions reach 13.2 million / cm³, the energy consumption (38.7W) and ozone (0.018ppm) are much higher than those in the embodiment. The resonant voltage matches the natural frequency of PZT, driving ultrasound stably and efficiently, avoiding the "energy scattering" of high-frequency AC, and achieving low energy consumption and low ozone by-products. Ozone is a key hidden danger in air disinfection. The ozone in the embodiment is only 1 / 2.25 of that in Comparative Example 3.

[0120] Comparative Example 4 reduces the overlap rate to 10%, and the negative oxygen ions to 16.5 million / cm³. The sterilization rate of 96.8% and the formaldehyde decomposition rate of 90.5% are significantly inferior to those of the embodiment. The overlap rate of 15% to 20% enables the "regular hexagonal honeycomb holes (low-voltage pole)" and the "cross honeycomb holes (high-voltage layer)" to be precisely coupled, forming a dense discharge channel of micro-discharge points. The low overlap rate leads to sparse discharge and energy dispersion, which directly weakens the disinfection and purification capabilities.

[0121] The ion range of the embodiment reaches 4.8~5.3m, which is much higher than that of the comparison example. The core reason is: the constraint of the dielectric barrier layer (glass layer): preventing arc generation, ensuring that the discharge energy is concentrated on "ionization" rather than "heat loss", and ensuring ion activity; the ultrasonic waves generated by PZT continuously push the negative oxygen ions to form a "beam", breaking through the diffusion limitations of traditional ion plasma and achieving air purification coverage at a longer distance.

[0122] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all included in the scope of protection of the present invention.

Claims

1. An ion plasma disinfection and purification module for air disinfection and purification equipment, comprising two mounting seats (1), an ion plasma generator (2) being mounted between the two mounting seats (1), and a mounting cover (11) being mounted above the mounting seats (1), characterized in that: The ion plasma generator (2) comprises a metal sheet layer A (21), a first glass layer (22), a high-voltage composite sheet layer (23), a second glass layer (24), and a metal sheet layer B (25) arranged in sequence; The high-voltage composite sheet layer (23) is a composite of a titanium alloy sheet and a PZT green sheet, which is obtained by hot pressing the PZT green sheet and the titanium alloy sheet, and the thickness of the titanium alloy sheet and the green sheet is no more than 0.1 mm; The metal sheet layer A (21) and the metal sheet layer B (25) are stainless steel having a honeycomb periodic structure pattern with regular hexagonal honeycomb holes; The titanium alloy sheet is provided with a honeycomb periodic structure pattern of cross-shaped honeycomb holes.

2. The ion plasma disinfection and purification module for air disinfection and purification equipment according to claim 1, characterized in that: The metal sheet layer A (21) and the metal sheet layer B (25) are low-voltage electrodes, and the first glass layer (22) and the second glass layer (24) are dielectric barrier layers.

3. The ion plasma disinfection and purification module for air disinfection and purification equipment according to claim 1, characterized in that: The thickness of the stainless steel is not greater than 0.2 mm.

4. The ion plasma disinfection and purification module for air disinfection and purification equipment according to claim 1, characterized in that: The thickness of the first glass layer (22) and the second glass layer (24) is not greater than 0.3 mm.

5. An ion plasma generating method for the ion plasma disinfection and purification module according to any one of claims 1 to 4, characterized in that: The specific steps include: Step 1: applying a 12 kV resonant voltage to the high-voltage composite sheet layer (23) so that the PZT layer generates a 20 kHz ultrasonic wave; Ultrasonic waves pass through the cross-shaped honeycomb holes of the titanium alloy sheet to form a standing wave array, generating a sound pressure of >100MPa at the hole edge, achieving air pre-ionization; Step 2: The regular hexagonal honeycomb holes of the metal sheet layer A (21) and the metal sheet layer B (25) are aligned with the cross honeycomb holes of the high-voltage composite sheet layer (23) at an overlap rate of 15%-20% to form a discharge channel, and micro-discharge points are generated at the edges of the cross holes under the action of the sound field; Step 3: The discharge area is constrained by the first glass layer (22) and the second glass layer (24) to prevent arcing, and the ultrasonic wave generated by the PZT drives the negative oxygen ions to form an ion plasma beam.

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