Corona discharge air purifier

Abstract

To provide a corona discharge type air purifier that generates strong ion wind, has high dust collection efficiency, and has sufficient bacteria removal, sterilization, deodorization and dust collection effects. [Solution] A corona discharge air purifier comprising: a case body including an upper surface formed of titanium and having an air intake port; a positive electrode formed of exhaust holes in the form of multiple slit-shaped or grid-shaped holes formed in the upper surface of the case body, the positive electrode being approximately 1.5 mm thick; a cylindrical dust collecting plate 7 that is suspended from the upper surface around the exhaust holes into the inside of the case body and is positively charged; multiple stainless steel needle electrodes 11 that are negative electrodes opposed to the grid-shaped positive electrode, the tips of the multiple needle electrodes 11 facing the positive electrode; and a DC high-voltage current unit that receives a DC low-voltage voltage, generates a DC high-voltage voltage, and applies the DC high-voltage voltage to the multiple needle electrodes 11, the positive electrode being approximately 1.5 mm thick.

Description

[Technical field]

[0001] The present invention relates to a corona discharge type air purifier that generates ion wind and ozone, and to a corona discharge type air purifier that removes bacteria, sterilizes, deodorizes, and collects dust. [Background technology]

[0002] Conventionally, there have been devices that use corona discharge to generate ions and ozone to sterilize and deodorize objects such as garbage. There are also devices that perform corona discharge in a space separate from the space in which the objects are placed, and supply the generated ions and ozone to the space in which the objects are placed, thereby sterilizing and deodorizing.

[0003] However, while conventional corona discharge sterilization and deodorization devices can purify the air using corona discharge, the reality is that the ionic wind is weak and the ability to charge dust and collect it is insufficient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication 2017-217572 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to provide a corona discharge type air purifier that generates strong ion wind, has high dust collection efficiency, and has sufficient germ removal, sterilization, deodorization, and dust collection effects. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides the following corona discharge type air purifying device for sterilization, deodorization, and dust collection. The corona discharge type air purifier for sterilization, deodorization and dust collection according to the present invention is a case body including a top surface portion formed of titanium and having an air suction port; The positive electrode is formed by a plurality of slit-shaped holes or lattice-shaped holes formed on the upper surface of the case body, and the positive electrode has a thickness of about 1.5 mm. An electrode; a cylindrical dust collecting plate that is suspended from the upper surface portion around the exhaust hole into the inside of the case body and is positively charged; A plurality of stainless steel needle electrodes, each of which is a negative electrode, are arranged opposite the grid-shaped positive electrode, and the tips of the needle electrodes are arranged to face the positive electrode; a DC high voltage current unit that receives a DC low voltage, generates a DC high voltage, and applies the DC high voltage to the plurality of needle electrodes, By applying a high DC voltage between the positive electrode and the multiple needle-shaped electrodes, a corona discharge is generated between the negative and positive electrodes, generating ozone and ions that flow toward the positive electrode to form a negative ion wind, which draws in the surrounding air toward the exhaust hole inside the case body and causes fine dust particles contained in the air to adhere to a positively charged dust collecting plate, thereby sterilizing, deodorizing and collecting dust. This is a discharge type air purifier. Effect of the Invention

[0007] In the corona discharge air purifier for sterilization, deodorization and dust collection according to the present invention, a high voltage of, for example, 7KV-8KV is applied to generate corona discharge and ozone between a slit-shaped titanium positive electrode and a needle-shaped electrode, forming a strong negative ion wind toward the positive electrode. The negatively charged particles are efficiently collected by a positively charged cylindrical dust collecting plate arranged around the exhaust hole, and the ion flow is efficiently led to the exhaust hole, making it possible to sterilize and deodorize. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a corona discharge type air purifying device according to the present invention. [Diagram 2] 1 shows the top surface of a case body of a corona discharge type air purifying device having a positive electrode formed of exhaust holes of a plurality of slit-shaped holes or lattice-shaped holes. [Diagram 3] 1 is a side view of a corona discharge type air purifying device according to the present invention. [Figure 4] 1 is a schematic diagram showing the internal structure of a corona discharge type air purifying device according to the present invention. [Diagram 5] 1 is a diagram showing a needle-shaped electrode mounting plate that is disposed inside the case body and on whose upper surface a needle-shaped electrode is provided. FIG. [Figure 6] This is a conductive pattern formed on the lower surface of the needle electrode mounting plate and electrically connected to the needle electrodes erected on the upper surface. [Figure 7] The results of measuring the viable cell count on the gelatin filter are shown. [Figure 8] The measurement results of the number of suspended particles in the case of natural attenuation are shown. [Figure 9] The measurement results of the number of suspended particles when the sample was operated are shown. [Figure 10] The results of Cryjl concentration measurement are shown. [Figure 11] The results of measuring the number of suspended particles during measurement in the case of natural attenuation are shown. [Figure 12] 4 shows the results of measuring the number of suspended particles during measurement when the sample was operated. [Figure 13] The test results for ammonia are shown. [Figure 14] The test results for hydrogen sulfide are shown. [Figure 15] The results of tobacco dust removal performance tests are shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. These embodiments are merely examples for explaining the present invention, and the present invention should not be interpreted as being limited to these embodiments. All of the inventions defined in the claims belong to the present invention unless there is a particular contradiction.

[0010] FIG. 1 shows a corona discharge air purifier 1 for sterilization, deodorization, and dust collection according to one embodiment of the present invention. The air purifier 1 has a cuboid shape, and a positive electrode consisting of a circular exhaust hole 3 having six parallel slits 2 is provided on the upper surface 4, and the outer periphery of the upper surface 4 is surrounded by four square side surfaces. Three rows of air intakes 6 are provided on the upper parts of the sides 5-1 and 5-2, and a switch SW for turning the air purifier on and off is provided on the lower part of the side 5-1. See FIG. 1 and FIG. 3. In this embodiment, the air purifier body is cuboid-shaped, but the shape of the air purifier body is not limited to a cuboid shape as long as the upper surface 4 can be provided with a plurality of parallel slit-shaped circular exhaust holes 3. When the air purifier body is covered with a separate cover, one or two side surfaces can be omitted as long as the strength of the body is not impaired.

[0011] In the corona discharge air purifier for sterilization, deodorization, and dust collection according to the present invention, the thickness of the positive electrode is preferably 1.5 mm, which makes it possible to strengthen the ion wind described below and to perform dust collection, sterilization, and disinfection efficiently. In addition, in order to prevent deterioration due to ozone oxidation, at least the upper surface of the air purifier body, and preferably the entire air purifier body, is made of titanium.

[0012] FIG. 2 shows the top surface 4 having a circular exhaust hole 3 consisting of six parallel slits 2 of different lengths in the approximate center. In the corona discharge air purifier of the present invention, instead of the parallel slits, a lattice-shaped exhaust hole arranged vertically and horizontally may be used. As shown in FIG. 4, a cylindrical dust collecting plate 7 is suspended inside the case body from around the exhaust hole, and the dust collecting plate is positively charged and can collect fine particles such as pollen that are negatively charged. Although not shown in detail, the top surface 4 can be removed from the air purifier body with screws or the like, and the cylindrical dust collecting plate 7 can also be removed from the top surface 4, so that collected dust particles such as pollen can be removed.

[0013] Fig. 4 shows the internal structure of a corona discharge type air purifier, Fig. 5 shows the top surface of a needle electrode mounting plate 8, and Fig. 6 shows a conductive pattern 10 that is electrically connected to 21 needle electrode mounting positions 9 evenly spaced on the top surface of the needle electrode mounting plate 8. As shown in Fig. 4, the base of a needle electrode 11 is fixed to the needle electrode mounting positions 9 of the needle electrode mounting plate 8 by solder or the like, and its tip extends inwardly of the cylindrical dust collecting plate 7 and faces the circular exhaust hole 3 at a desired distance on the top surface 4, and the needle electrode mounting plate 8 is supported by support legs 12 on the bottom plate of the air purifier 1.

[0014] In Figure 4, reference numeral 13 denotes an external power supply terminal, 14 denotes an adapter that converts an AC voltage of 100V into a DC voltage of about 12V, and 15 denotes a transformer that converts a DC voltage such as 12V into a high voltage voltage of 7KV-8KV, and the high voltage is applied to a needle electrode 11 at the needle electrode attachment position 9 via a conductive pattern 10. By applying a high voltage between the multiple needle-shaped negative electrodes and the positive electrode consisting of the exhaust hole, a corona discharge is generated between the exhaust hole in the case body and the tips of the multiple needle-shaped electrodes, generating ions and ozone and forming a wind of negative ions toward the positive electrode. This draws in surrounding air toward the exhaust hole inside the case body, causing fine dust particles contained in the air to adhere to the dust collecting plate of the positive electrode, making it possible to sterilize and disinfect the device. EXAMPLES

[0015] The following air purification performance tests were conducted on the following corona discharge air purification device according to the present invention. Tests 2, 3, and 4 were conducted at the Saito Laboratory of the Japan Food Research Laboratories (4-41 Asagi 7-chome, Saito, Ibaraki, Osaka). 1. Evaluation test of removal performance against airborne bacteria (Staphylococcus epidermidis) 2.Pollen removal performance evaluation test 3. Deodorizing effect test (ammonia and hydrogen sulfide)

[0016] Specimen (tested corona discharge type air purifying device according to the present invention) 1. Corona discharge air purifier (1) Case dimensions: 10cm x 10cm x 10cm, cubic shape (2) Case wall thickness: 1.5mm (3) Case material: Titanium (4) Circular exhaust hole: 70 mm diameter exhaust hole with parallel slits at equal intervals (slit width 8 mm, slit distance 4 mm) (5) Cylindrical dust collecting plate: diameter 70 mm, height 10 mm (6) 21 negative needle electrodes, evenly spaced to correspond to the exhaust holes. Distance between needle electrode and positive electrode: 8mm~10mm (see Figure 4) (7) Adapter (converts AC voltage to DC12V) (8) High-voltage transformer (transforms DC12V to high-voltage 7000-8000V) (9) Conductive pattern for needle-shaped electrodes (see Figure 6)

[0017] 1. Evaluation test of removal performance against airborne bacteria (Staphylococcus aureus) (1) Test Overview The test was conducted with reference to the Japan Electrical Manufacturers' Association JEM1467 Household Air Purifiers (revised March 25, 2015) Appendix D (regulations) "Evaluation test for removal performance against airborne viruses." However, the test microorganism used was the following strain, and the culture conditions were changed: Staphylococcus epidermidis NBRC 12993 (Staphylococcus epidermidis). The measurement conditions are shown in Table 1, and the temperature and humidity at the start and end of the measurement are shown in Table 2. [Table 1]

[0018] [Table 2] (2) Measurement results The results of measuring the viable cell count on the gelatin filter are shown in Figure 7, and the results of measuring the number of suspended particles in the cases of natural attenuation and sample operation are shown in Figures 8 and 9, respectively. As can be seen from Figures 7, 8, and 9, the number of Staphylococcus aureus was significantly reduced by operating the sample compared to the reduction due to natural attenuation, demonstrating that this corona discharge air purifier has extremely high removal performance for airborne bacteria (Staphylococcus aureus).

[0019] 2.Pollen removal performance evaluation test (1) Test Overview The test was conducted with reference to the Japan Electrical Manufacturers' Association JEM1467 Household Air Purifiers (revised March 25, 2015) Appendix D (regulations) "Evaluation test of removal performance against airborne viruses." However, the test subject was cedar pollen extract, and the test conditions were changed. The test conditions are shown in Table 3, and the temperature and humidity at the start and end of the test are shown in Table 4. [Table 3]

[0020] [Table 4] (2) Measurement results The measurement results of the Cryjl concentration are shown in Figure 10. Furthermore, the measurement results of the number of suspended particles during the measurements in the cases of natural attenuation and sample operation are shown in Figures 11 and 12, respectively. As can be seen from Figures 10, 11, and 12, the number of airborne pollen particles was significantly reduced by operating the sample compared to the reduction due to natural attenuation, demonstrating that this corona discharge air purifier has extremely high removal performance for airborne pollen particles.

[0021] 3. Deodorizing effect test (ammonia and hydrogen sulfide) (1) Test Overview The deodorizing effect of the samples against ammonia and hydrogen sulfide was tested using a gas detector tube method. (2) Test method a) Reagents and Equipment Desiccator (approx. 109L) [Fine] Ammonia: Gas generated from ammonia water (28%, special grade) (Koshu Chemical Co., Ltd.) was used. Hydrogen sulfide: Gas generated by adding dilute sulfuric acid to iron (II) sulfide (for generating hydrogen sulfide) (Koshu Chemical Co., Ltd.) was used. Gas detector tube (Gastec Corporation) b) Operation The specimen was placed in a desiccator (approximately 109 L) together with the stirring fan, and the stirring fan was operated to add the test gas to reach the set gas concentration. The stirring fan was stopped, the specimen was operated, and the gas concentration in the desiccator was measured with a gas detection tube at each elapsed time. The same operation was also performed without the specimen being operated. A blank test was performed by performing the same operation without the specimen. The test conditions are shown in Table 5.

[0022] [Table 5] (3) Test results The test results for ammonia are shown in Figure 13, and the test results for hydrogen sulfide are shown in Figure 14. As can be seen from FIG. 13, the ammonia deodorizing effect was high when the specimen was operated, and FIG. 14 shows that the removal performance for hydrogen sulfide was extremely high.

[0023] 4.Tobacco dust removal performance evaluation test The tobacco dust removal performance evaluation test was conducted as follows. A single cigarette was lit in a sealed box measuring 750mm wide x 350mm deep x 300mm high, and the measurement was started after it was left to burn completely. The tobacco dust concentration was measured every 3 minutes. The test machine used was the "Digital Dust Meter P-5H" manufactured by Shibata Scientific Co., Ltd. The test result data for tobacco dust removal performance are shown in Figure 15. As can be seen from the test results data on tobacco dust removal performance, when allowed to decay naturally, the tobacco dust concentration hardly decreased for 30 minutes, whereas when the air purifying device of the present invention was used, the tobacco dust concentration decreased to a very low level after 12 minutes. [Industrial Applicability]

[0024] The corona discharge type air purifying device of the present invention has excellent dust collection, sterilization and disinfection performance, such as airborne bacteria removal performance, pollen removal performance, deodorization effect (ammonia and hydrogen sulfide), and tobacco dust removal performance, and is therefore highly applicable industrially. [Explanation of symbols]

[0025] 1. Corona discharge type air purifier, 2...slit, 3. Exhaust hole (positive electrode), 4...Top part, 5-1, 5-2: Side, 6... Air intake, 7 Dust collecting plate, 8. Needle electrode mounting plate, 9. Needle electrode installation position, 10...conductive pattern, 11...needle electrode, 12...support leg, 13 External power supply terminal, 14 DC voltage adapter, 15... Transformer, SW: ON / OFF switch

Claims

1. a positive electrode having an exhaust hole formed therein, and a case body having an intake port; A positively charged dust collecting plate that protrudes into the case body in a cylindrical shape; a negative electrode housed within the case body, the tip of which faces the positive electrode; a DC high voltage unit that applies a DC voltage between the positive electrode and the negative electrode; An external power supply terminal; Equipped with A DC voltage is applied between the positive electrode and the negative electrode to generate a corona discharge between the negative electrode and the positive electrode, thereby generating ozone and ions, and generating a negative ion wind toward the exhaust hole; The tip of the negative electrode is located within the area surrounded by the dust collecting plate. Air purifier.

2. A case body having a positive electrode with an exhaust hole and an intake port; A positively charged dust collecting plate that protrudes into the case body in a cylindrical shape; a negative electrode housed within the case body, the tip of which faces the positive electrode; a DC high voltage unit that applies a DC voltage between the positive electrode and the negative electrode; An external power supply terminal; Equipped with A DC voltage is applied between the positive electrode and the negative electrode to generate a corona discharge between the negative electrode and the positive electrode, thereby generating ozone and ions, and generating a negative ion wind toward the exhaust hole; The exhaust hole is a plurality of slits arranged in parallel. Air purifier.

3. The negative electrode is a plurality of needle-shaped electrodes.

3. The air purifying device according to claim 1 or 2.

4. An air purifying device as described in any one of claims 1 to 3, wherein the positive electrode is a 1.5 mm thick plate material that forms part of the case body.

5. The dust collection plate is removably attached to the case body. The air purifying device according to any one of claims 1 to 4.

6. The positive electrode is made of titanium. The air purifying device according to any one of claims 1 to 5.

7. The exhaust hole is a plurality of holes formed in a lattice shape.

7. The air purifying device according to claim 1, 3, 4, 5 or 6.

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