Electrostatic screen door

Abstract

To provide an electrostatically charged screen door and electrostatically charged filter that, with a simple configuration, can reduce the amount of pollen present on the outdoor side entering the indoor side, particularly due to their high adsorption performance for pollen. [Solution] An electrostatically charged screen door 6 comprising a conductive mesh 4 and a sash supporting the mesh 4, wherein the mesh 4 consists of two or more meshes (I6a, II6b), and the mesh 4 comprises at least a first mesh I6a (or II6b) that is positively charged and a second mesh II6b (or I6a) that is negatively charged.

Description

Technical Field

[0001] The present invention relates to an electrified screen door.

Background Art

[0002] While ventilation is important for preventing infectious diseases, as shown in FIGS. 1(a) and 1(b), the intrusion of pollen into a room through the openings of a house is a problem for patients with hay fever. In Non-Patent Documents 1 and 2, in order to reduce the amount of pollen scattered, the inventors charged the mortar used for the surface finish of a building and the aluminum used for sashes, and imparted the pollen adsorption performance to the building materials. It is described that the charged building materials become less likely to exhibit the pollen adsorption performance as the distance from the pollen increases.

[0003] Particularly recently, ventilation has been emphasized in response to the novel coronavirus. However, when the window is opened for ventilation regardless of the season, pollen simultaneously flows into the room, which places a burden on patients with hay fever or causes hay fever in healthy people.

[0004] Patent Document 1 describes an air cleaner provided with an intake device and a filter having a conductive filter material, etc., which purifies air by negative ions generated by high-voltage static electricity applied to the filter material and the filter.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Non-Patent Documents

[0006]

Non-Patent Document 1

[0007] However, there were problems such as the equipment being large in scale, or even if the equipment was not large in scale, the purification of pollen was insufficient, for example, when the target of purification was pollen. Therefore, the present invention aims to provide an electrostatic screen door and an electrostatic filter that can reduce the amount of pollen and other particles present on the outdoor side entering the indoor side with a simple configuration and particularly high adsorption performance for pollen. [Means for solving the problem]

[0008] The present invention, which solves the above problems, is as follows. [1] An electrostatically charged screen door comprising a conductive mesh and a sash supporting the mesh, wherein the mesh consists of two or more meshes facing each other from the air inlet side to the air outlet side, and the mesh comprises at least a first mesh that is positively charged and a second mesh that is negatively charged. [2] The electrostatically charged screen door described in [1] is characterized in that the screen is installed with a gap of 5 mm or more. [3] An electrostatically charged screen door as described in [1] to [2], characterized in that it has an insulating material between the first screen and the second screen to further insulate against electricity. [4] An electrostatically charged screen door as described in [1] to [3], characterized in that the first screen is installed on the outdoor side and the second screen is installed on the indoor side of the first screen. [5] The electrostatic screen door described in [1] to [4] is characterized in that the mesh size of the screen is 16 mesh to 40 mesh. [6] A static charge filter comprising a conductive mesh and a support for the mesh, wherein the mesh consists of two or more meshes facing each other from the air inlet side to the air outlet side, and the mesh comprises at least a first mesh that is positively charged and a second mesh that is negatively charged. [7] The electrostatic filter described in [6] is characterized in that the mesh is installed with gaps of 5 mm or more. [8] An electrostatic filter according to [6] to [7], characterized in that it further has an insulating material between the first mesh and the second mesh to insulate electricity. [9] The electrostatic filter described in [6] to [8] is characterized in that the first mesh is installed on the outdoor side and the second mesh is installed on the indoor side of the first mesh.

[10] The electrostatic filter is an electrostatic filter as described in [6] to [9], characterized in that it is installed in the air inlet and / or outlet of a building such as a house.

[11] An electrostatic filter as described in [6] to

[10] , characterized in that the electrostatic filter attached to the air inlet and / or outlet is attached upstream of other filters.

[12] The electrostatic filter described in [6] to

[11] is characterized in that the mesh size of the net is 16 mesh to 40 mesh. [Effects of the Invention]

[0009] According to the electrostatic screen door or electrostatic filter of the present invention, the amount of pollen and other particles present on the outdoor side entering the indoor side can be reduced. [Brief explanation of the drawing]

[0010] [Figure 1] This diagram shows the conditions around openings in a house: (a) before ventilation, (b) after ventilation, and (c) after pollen has been adsorbed. [Figure 2] This diagram schematically illustrates the mechanism by which pollen adheres to an electrostatically charged screen door, which is one embodiment of the present invention. [Figure 3] This figure shows a diffusion device used to uniformly disperse artificial pollen. [Figure 4] The figure shows (a) the cross-section of the pollen adsorption part of the diffusion device and (b) the observation surface of the deposition plate respectively. [Figure 5] The figure shows the relationship between the deposition number per wire mesh and the output voltage (16-mesh wire mesh). [Figure 6] The figure shows the relationship between the deposition number per wire mesh and the output voltage (18-mesh wire mesh). [Figure 7] The figure shows the relationship between the deposition number and the output voltage (16-mesh, wire diameter 0.3mm wire mesh). [Figure 8] The figure shows the relationship between the deposition number and the output voltage (16-mesh, wire diameter 0.4mm wire mesh). [Figure 9] The figure shows the relationship between the deposition number and the output voltage (16-mesh, wire diameter 0.5mm wire mesh). [Figure 10] The figure shows the relationship between the deposition number and the output voltage (18-mesh, wire diameter 0.3mm wire mesh). [Figure 11] The figure shows the relationship between the deposition number and the output voltage (18-mesh, wire diameter 0.4mm wire mesh). [Figure 12] The figure shows the relationship between the deposition number and the output voltage (18-mesh, wire diameter 0.5mm wire mesh). [Figure 13] The figure shows the relationship between the deposition number and the output voltage for wire mesh I (-) and wire mesh II (+) (16-mesh wire mesh). [Figure 14] The figure shows the relationship between the deposition number and the output voltage for wire mesh I (-) and wire mesh II (+) (18-mesh wire mesh). [Figure 15] The figure shows the relationship between the deposition number in the grounded state and the type of wire mesh (mesh number and wire diameter). [Figure 16] The figure shows the relationship between the deposition number and the output voltage (16-mesh, wire diameter 0.3mm wire mesh). [Figure 17] The figure shows the relationship between the deposition number and the output voltage (16-mesh, wire diameter 0.4mm wire mesh). [Figure 18] The figure shows the relationship between the deposition number and the output voltage (18-mesh, wire diameter 0.3mm wire mesh). [Figure 19] This figure shows the relationship between the number of piled particles and the output voltage (18 mesh, 0.4 mm wire diameter wire mesh). [Figure 20] This figure shows the relationship between the number of particles deposited and the output voltage in wire mesh I (-) and wire mesh II (+) (16-mesh wire mesh). [Figure 21] This figure shows the relationship between the number of particles deposited and the output voltage in wire mesh I (-) and wire mesh II (+) (18 mesh wire mesh). [Modes for carrying out the invention]

[0011] The embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the following embodiments, and modifications, alterations, and improvements may be made without departing from the scope of the invention.

[0012] As shown in Figure 1(a), a building structure such as a house 1 includes an opening 9 (e.g., a window) that connects the indoor side i and the outdoor side o of the house 1, and a closing object 3 (e.g., window glass) that closes the opening 9. Before ventilation, it is assumed that virus 2 may be airborne in the indoor area i of house 1, potentially affecting, for example, a person p living in the indoor area i.

[0013] House 11 has a screen door 4 instead of an obstruction 3 in House 1. For example, if, in order to prevent infection by virus 2, as in (b), the virus 2 is to be expelled to the outside side o by ventilation using the screen door 4, pollen 5 will simultaneously enter from the outside side o towards the inside side i.

[0014] House 21, like house 11, has a screen door 4, but the screen door 4 is a charged screen door 6 that is charged by voltage applied from the power supply 8 via a conductor 7. In addition, the charged screen door 6 is equipped with an electrically insulating sash that supports the screen.

[0015] As shown in Figure 2, one embodiment of the present invention, the electrostatically charged screen door 6, comprises a wire mesh I6a that is positively charged and a wire mesh II6b that is negatively charged. Each is charged by a voltage applied from a DC power supply to wire mesh I6a and wire mesh II6b, respectively. The configuration of the electrostatically charged screen door 6 will be described later based on Figure 4(a).

[0016] The electrostatically charged screen door 6 is equipped with at least two conductive meshes, I6a which can be positively or negatively charged, and II6b which can be charged with the opposite polarity to I6a (if I6a is positively charged, II6b can be negatively charged), facing from the air inlet side to the air outlet side. I6a and II6b face each other and form a series of ventilation paths. From the viewpoint of increasing the adsorption capacity for pollen 5, there may be two or more meshes, and three or more meshes may be alternately positively and negatively charged. From the viewpoint of conductivity, the material of the mesh may include not only metals such as stainless steel and iron (including plated iron), but also carbon and the like, and can be selected as appropriate.

[0017] Pollen 5 floating towards the wire mesh I6a is first adsorbed by the positively charged wire mesh I6a, along with negatively charged pollen 5 and pollen 5 that has become polarized by approaching the wire mesh I6a. Pollen 15 that is not adsorbed by the wire mesh I6a and passes through it is then adsorbed by the negatively charged wire mesh II6b, becoming pollen 16. This is because most of the pollen 15 is positively charged by the wire mesh I6a. Furthermore, positively charged pollen 5 is difficult to adsorb by the wire mesh I6a, but is easily adsorbed by the negatively charged wire mesh II6b. Note that the wire mesh I6a may be negatively charged and the wire mesh II6b may be positively charged.

[0018] As described above, the electrostatically charged screen door 6 can prevent pollen 5 from entering the room by adsorbing it onto the screen door 4 as it passes through, thereby suppressing the entry of pollen 5 into the indoor side i along with ventilation. Of course, ventilation is performed not only for the prevention of infectious diseases but also for general purposes such as improving the indoor air environment. The electrostatically charged screen door 6 can also be configured as an electrostatically charged filter. The electrostatically charged filter supports positively charged and negatively charged wire mesh with an electrically insulating support and may be attached to the air inlet or outlet of a building such as a house. When performing first-class mechanical ventilation, second-class mechanical ventilation, third-class mechanical ventilation, or natural ventilation, outside air that flows in from the outside air inlet flows out from the inside outlet, or inside air that flows in from the inside air inlet flows out from the outside outlet. Generally, filters made of resin or the like are provided at air inlets, but generally used filters, when they adsorb pollen and other particles at air inlets and outlets, are difficult to wash off, and often need to be replaced every few months. On the other hand, when using the filter of the present invention, it exhibits adsorption performance for pollen and other particles even with a coarser mesh than generally used filters, so a mesh of about 16 mesh to 100 mesh, preferably 16 mesh to 40 mesh, is used to adsorb pollen and other particles by electrostatic charge. For this reason, attached pollen and other particles can be easily removed by washing with water. Using a mesh with a mesh size of 40 or less makes it significantly easier to wash away, and a mesh size of 18 or less is particularly preferable. Furthermore, by installing an electrostatic filter upstream of the filter attached to the air inlet or outlet (upstream of the airflow), the amount of pollen and other particles adsorbed by filters made of resin or similar materials, which have high adsorption performance but are difficult to clean, can be reduced, thereby reducing the frequency of replacement of these resin filters. [Examples]

[0019] (Wire mesh) Table 1 shows the types of wire mesh. We will use plain-weave stainless steel wire mesh, which is commonly used for screen doors. The stainless steel wire mesh used will be six types with large wire diameters from the standard specifications for screen door wire mesh.

[0020] [Table 1]

[0021] (pseudo pollen) Pseudopollen is used as a substitute for pollen. The pseudopollen used is the spores of Lycopodium clavatum, commonly used in pollen dispersal research. The pseudopollen has an average particle size of approximately 35 μm and a true density of 1.05 g / cm³. 3 That is the case.

[0022] (Experimental apparatus) (DC high-voltage power supply) A DC high-voltage power supply (KTK-125P, KTK-125N, manufactured by Kasuga Electric Co., Ltd.) is used to apply voltage to the stainless steel mesh. The specifications of the DC high-voltage power supply are shown in Table 2. This device can adjust the output voltage from 0 to ±20.0kV in 0.1kV increments.

[0023] [Table 2]

[0024] (Diffusion device) A diffusion device 10 is used to uniformly disperse the artificial pollen. The diffusion device 10 is shown in Figure 3. The airflow from the blower 14 is 3.5 m³. 3 A wind of / min is blown out from the nozzle 12 in the center of the diffusion device 10, and the blown wind diffuses the artificial pollen placed at the nozzle 12 into the diffusion device 10. The diffused artificial pollen settles by gravity within the diffusion device 10. The part that adsorbs the artificial pollen that settles by gravity is designated as the pollen adsorption part 13.

[0025] A cross-section of the pollen adsorption section 13 is shown in Figure 4(a). The dimensions of the accumulation plate 19 are 200 mm in length and 200 mm in width. A wire mesh II6b is installed 50 mm above the accumulation plate 19, and a wire mesh I6a is installed 5 mm above the wire mesh II6b. These are sandwiched between electrically insulating U-shaped resin 16, and a resin intrusion prevention plate 15 is attached to prevent the inflow of simulated pollen from the sides. One of the short ends of the wire mesh is fixed so that it protrudes from the U-shaped resin 16, and is connected to a DC high-voltage power supply 18 with a conductor 17 to become charged. The gap between wire mesh I6a and wire mesh II6b is preferably 5 mm or more, and more preferably 10 mm, from the viewpoint of preventing a short circuit between the two charged wire meshes. Furthermore, from the same viewpoint, it is preferable to have an insulating material, particularly a mesh-shaped insulating material, between wire mesh I6a and wire mesh II6b to insulate electricity. The insulating material can be appropriately selected from resins (polypropylene, polyvinyl chloride, polyethylene, polyester, etc.), glass fiber, etc.

[0026] The pollen adsorption section 13 shown in Figure 4(a) corresponds to the electrostatically charged screen door 6 provided by the house 21 and has the mechanism shown in Figure 2. In Figure 4(a), the relationship in which the pseudo-pollen diffuses and floats and comes into contact with or passes through the wire mesh I6a from a nearly vertical direction is similar to the relationship in Figure 2 in which the pollen 5 floats on the screen door of the electrostatically charged screen door 6 and comes into contact with or passes through from a nearly vertical direction.

[0027] (Experimental method) The output voltage from the DC high-voltage power supply 18 is varied in increments of 0.5kV within the range of -2.0 to 2.0kV. When the output voltage is 0kV, the wire mesh I6a and / or II6b are grounded. 0.500g of simulated pollen is placed in the nozzle 12 inside the diffusion device 10. Five seconds after the DC high-voltage power supply 18 starts applying voltage to the wire mesh I6a and / or II6b, the blower 14 blows air into the diffusion device 10, diffusing all the simulated pollen into the device 10. After the simulated pollen has been diffused, it is left to stand for three minutes to allow it to settle by gravity and be adsorbed onto the wire mesh I6a and / or II6b. Simulated pollen that is not adsorbed onto the wire mesh I6a and / or II6b accumulates on the accumulation plate 19 located below the wire mesh II6b.

[0028] After standing, the voltage application was terminated, and the nine observation surfaces 22 of the deposition plate 19 shown in Figure 4(b) were observed with a microscope. The number of pseudo-pollen grains deposited on the observation surfaces 22 (hereinafter referred to as the number of deposited grains) was counted. A small number of deposited grains indicates high adsorption performance of the wire mesh I6a and / or II6b. The observation surfaces 22 of the deposition plate were 1.5 × 1.5 mm squares. The measurements were performed indoors at a temperature of 20-22°C and a humidity of 44-55%.

[0029] The experiment will be conducted in two patterns: using only one wire mesh and using two wire meshes. When using only one wire mesh, wire mesh II will not be installed, and the experiment will be conducted using only wire mesh I (comparative example). When using two wire meshes, both wire mesh I and wire mesh II will be installed, and there will be four types: when wire mesh I is negatively charged and wire mesh II is positively charged (hereinafter referred to as wire mesh I(-) wire mesh II(+), example); when wire mesh I is positively charged and wire mesh II is negatively charged (hereinafter referred to as wire mesh I(+) wire mesh II(-), example); when wire mesh I is negatively charged and wire mesh II is grounded (hereinafter referred to as wire mesh I(-) wire mesh II(grounded), reference example); and when wire mesh I is grounded and wire mesh II is negatively charged (hereinafter referred to as wire mesh I(grounded) wire mesh II(-), reference example).

[0030] (Pollen adsorption performance when using only one wire mesh) Figure 5 shows the relationship between the number of pseudo-pollen particles deposited on a single wire mesh and the absolute value of the output voltage for a 16-mesh wire mesh, and Figure 6 shows the relationship for an 18-mesh wire mesh. Figures 5 and 6 show that as the absolute value of the output voltage increases, the number of accumulated particles decreases. Non-patent documents 1 and 2 show that mortar boards and aluminum boards can adsorb pseudo-pollen when charged. Charged wire mesh has similar adsorption performance for pseudo-pollen while still being breathable.

[0031] At output voltages of 1.0kV or higher, no significant difference is observed between positively charged and negatively charged surfaces, regardless of wire diameter. Based on Non-Patent Literature 2, this is thought to be because the applied voltage is sufficiently large compared to the charge level of the simulated pollen. In each charge level, the wire mesh with a wire diameter of 0.4mm has fewer accumulated particles compared to the wire mesh with a wire diameter of 0.3mm at most output voltages. This is thought to be because the porosity decreases as the wire diameter increases, causing the simulated pollen to accumulate on the wire mesh.

[0032] (Pollen adsorption performance when using two wire mesh screens) (Comparison based on combinations of wire mesh charge levels) The relationship between the number of particles stacked on two wire meshes and the output voltage is shown in Figures 7 to 9 for 16-mesh wire mesh with wire diameters of 0.3, 0.4, and 0.5 mm, and in Figures 10 to 12 for 18-mesh wire mesh with wire diameters of 0.3, 0.4, and 0.5 mm. These can be summarized in Table 3.

[0033] [Table 3]

[0034] Figures 5, 6, and 7-12 show that when the output voltage is 0.0kV, i.e., grounded, the number of pollen particles deposited is less when two wire meshes are used than when only one wire mesh is used. This indicates that even if the wire mesh is not charged, the accumulation of pollen on the wire mesh reduces the number of particles deposited on the deposition plate (hereinafter referred to as the filtering effect).

[0035] On the other hand, as shown in Figures 7 to 12, when using two wire meshes, at an output voltage of 0.5 kV or higher, the number of deposited particles is lower and the adsorption performance is higher for wire mesh I(-) wire mesh II(+) and wire mesh I(+) wire mesh II(-) than for wire mesh I(-) wire mesh II(grounded) and wire mesh I(grounded) wire mesh II(-). Therefore, the two wire meshes charged with opposite polarity, Wire Mesh I(-)Wire Mesh II(+) and Wire Mesh I(+)Wire Mesh II(-), do not have a reduced number of deposits simply due to the filtering effect of the increased number of wire meshes compared to using only one wire mesh.

[0036] It is believed that the two wire meshes, each charged with opposite polarity, exhibit their own ability to adsorb pseudo-pollen. Furthermore, when using only one wire mesh at an output voltage of 2.0kV, the number of accumulated particles decreases by up to approximately 56% with a 16-mesh wire diameter of 0.4mm, but when using two wire meshes, the decrease is up to approximately 6% with a 16-mesh wire diameter of 0.4mm, indicating a significant reduction when using two wire meshes.

[0037] There is no significant difference in the number of particles deposited on wire mesh I(-) and wire mesh II(+) compared to wire mesh I(+) and wire mesh II(-). Based on Non-Patent Literature 2, it is thought that equivalent pseudo-pollen adsorption performance can be obtained if the absolute values ​​of the output voltages are the same, because the applied voltage is sufficiently large compared to the charge amount of the pseudo-pollen. Furthermore, compared to using only one wire mesh, when using two wire meshes charged with opposite polarity, the difference in the number of particles deposited becomes smaller at output voltages of 1.5kV or higher. It is thought that because the mechanism involves charging the pseudo-pollen with wire mesh I and adsorbing it with wire mesh II which is charged with opposite polarity, the original charge state of the pseudo-pollen becomes less influential.

[0038] (Comparison based on differences in wire mesh specifications) The relationship between the number of particles deposited in wire mesh I (-) and wire mesh II (+) and the output voltage is shown in Figure 13 for a 16-mesh wire mesh and in Figure 14 for an 18-mesh wire mesh. Figure 13 shows that at an output voltage of 0.0kV, i.e., in a grounded state, the larger the wire diameter of the wire mesh, the fewer particles are deposited. This is thought to be because a larger wire diameter reduces the porosity, thus increasing the filtering effect of the wire mesh. On the other hand, at output voltages of 0.5kV and above, there is no significant difference in the number of particles deposited due to differences in wire diameter. At output voltages of 0.5kV and above, the pseudo-pollen adsorption performance due to the charging of the wire mesh is sufficiently large, so pseudo-pollen is adsorbed not only on the top surface of the wire mesh but also on the sides, and the influence of the filtering effect on the number of particles deposited is reduced.

[0039] As shown in Figure 14, in the case of 18-mesh wire mesh, similar to the case of 16-mesh wire mesh, when grounded, the larger the wire diameter of the wire mesh, the fewer particles are deposited. However, unlike the case of 16-mesh wire mesh, at an output voltage of 0.5kV, there is a difference in the number of deposited particles, with the number of deposited particles decreasing as the wire diameter of the wire mesh increases. The 18-mesh has a smaller porosity and a larger surface area than the 16-mesh, so pseudo-pollen is more likely to accumulate on the wire mesh, and it is thought that the filtering effect remains even at an output voltage of 0.5kV. On the other hand, in the case of wire mesh I(-) and wire mesh II(+), at output voltages of 1.0kV or higher, there is no significant difference in the number of deposited particles due to the difference in wire diameter, similar to the case of 16-mesh wire mesh.

[0040] Comparing Figures 13 and 14, for wire mesh I(-) and wire mesh II(+), at output voltages of 1.0kV or higher, there is no significant difference in the number of accumulated particles due to the mesh type. For all types of wire mesh, the number of accumulated particles is 100 or less, indicating high adsorption performance. In particular, at an output voltage of 2.0kV, the number of accumulated particles is low, ranging from 25 to 50. We believe that as the output voltage increases, the pseudo-pollen adsorption performance due to the charging of the wire mesh increases, making it less susceptible to differences due to the porosity. Based on the above, when using two wire meshes, wire mesh I(-) and wire mesh II(+) have an output voltage of 2.0kV and exhibit the highest pseudo-pollen adsorption performance regardless of mesh size or wire diameter.

[0041] Within the measurement range of the above examples, the following was found. 1) While the charged wire mesh is breathable, it also has the same adsorption properties for pseudo-pollen as mortar boards and aluminum boards. 2) The wire mesh I(-) wire mesh II(+) and wire mesh I(+) wire mesh II(-) exhibit pseudo-pollen adsorption performance because each of the two wire meshes is charged with opposite polarity. 3) When using only one wire mesh at an output voltage of 2.0kV, the number of deposits decreases by up to approximately 56% with a 16-mesh wire diameter of 0.4mm, but when using two wire meshes, the decrease is up to approximately 6% with a 16-mesh wire diameter of 0.4mm, and the decrease is significant when using two wire meshes. 4) The pseudo-pollen adsorption performance due to the wire mesh becoming charged is sufficiently greater than the filtering effect of the wire mesh itself, so there is little difference in the number of accumulated particles when the wire mesh is charged. 5) When using two wire meshes, wire mesh I (-) and wire mesh II (+) have an output voltage of 2.0kV, and exhibit the highest pseudo-pollen adsorption performance regardless of mesh size or wire diameter.

[0042] (Additional examples) In addition to the stainless steel mesh shown in Table 1, we also investigated the pollen adsorption performance of 16-mesh mesh with a wire diameter of 0.6 mm and 18-mesh mesh with a wire diameter of 0.6 mm. The results are summarized in Tables 4 and 5.

[0043] [Table 4] [Table 5]

[0044] (Pollen adsorption performance of two wire mesh panels) (Comparison of single-layer wire mesh and wire mesh charged with the same polarity) Figures 16 to 19 show the relationship between the number of stacked particles and the output voltage. Figure 16 shows the case of a 16-mesh wire mesh with a wire diameter of 0.3 mm, Figure 17 shows the case of a 16-mesh wire mesh with a wire diameter of 0.4 mm, Figure 18 shows the case of an 18-mesh wire mesh with a wire diameter of 0.3 mm, and Figure 19 shows the case of an 18-mesh wire mesh with a wire diameter of 0.4 mm.

[0045] Figures 16 to 19 show that, regardless of the type of wire mesh, using two wire meshes results in a greater reduction in the number of deposits between an output voltage of 0.0 kV and 2.0 kV compared to using one wire mesh. Figure 17 shows that with one wire mesh, the reduction can be as low as approximately 60% between an output voltage of 0.0 kV and 2.0 kV. On the other hand, Figure 18 shows that with two wire meshes, the reduction can be as low as approximately 53%.

[0046] (Comparison of wire mesh charged with the same polarity and wire mesh charged with only one polarity) Figures 16 to 19 show that, regardless of the type of wire mesh, at an output voltage of 0.5kV, the number of accumulated particles is similar for wire mesh position II(-) wire mesh II(-) and wire mesh I(-) wire mesh II (grounded). At output voltages of 1.0kV or higher, the number of accumulated particles for wire mesh II(-) wire mesh II(-) is slightly greater than that for wire mesh I(-) wire mesh II (grounded). This is thought to be because when pseudo-pollen that was not adsorbed by wire mesh I passes through wire mesh I, it becomes charged with the same polarity as wire mesh I, and in the case of wire mesh I(-) wire mesh II(-), which has the same polarity, it repels wire mesh II.

[0047] Figures 20 and 21 show that, at the same output voltage, a smaller wire diameter tends to result in fewer deposits. This trend is particularly pronounced in the 0-0.5kV range.

[0048] (Pollen adsorption performance with and without wire mesh) Figure 15 shows the relationship between the number of stacks of single and double wire mesh at an output voltage of 0kV and the type of wire mesh. From Figure 15, in the case of 16-mesh wire mesh with a wire diameter of 0.3 mm, which has the largest open area ratio, the number of open areas is reduced to about 60% in the case of single wire mesh and to about 42% in the case of double wire mesh compared to the case without wire mesh.

[0049] Considering recent circumstances, the following points are particularly noteworthy: Ventilation is considered important in response to the coronavirus. However, when windows are opened in early spring to ventilate, pollen can enter at the same time, potentially triggering hay fever. By using a double layer of screen door mesh and electrostatically charging it, pollen and other particles are attracted to the first layer of mesh. Any pollen that is not attracted becomes electrostatically charged by the screen door and is attracted to the second layer of mesh, which is charged with the opposite polarity. [Industrial applicability]

[0050] The electrostatically charged screen door and electrostatically charged filter of the present invention can be used in screen doors of buildings. [Explanation of Symbols]

[0051] 1, 11, 21: House 2: Virus 3: Obstruction 4: Window screen 5, 15: Pollen 6: Electrostatically charged screen door 6a: Wire mesh I 6b: Wire Mesh II 7, 17: Conductor 8, 18: Power supply 9: Opening 10: Diffusion device 12: Spout 13: Pollen adsorption part 14: Blower 15: Intrusion prevention plate 16: U-shaped resin 19: Deposit plate 22: Observation surface i: Indoor side o: Outdoor side p:person

Claims

1. A charge filter comprising a conductive mesh and a support for the mesh, wherein the mesh consists of two or more meshes facing each other from the air inlet side to the air outlet side, and the mesh comprises at least a first mesh that is positively charged and a second mesh that is negatively charged. The material of the aforementioned mesh is stainless steel. A charging filter characterized in that the voltage range for charging the mesh is -2.0 to 2.0 kV.

2. The electrostatic filter according to claim 1, characterized in that the mesh is installed with gaps of 5 mm or more and up to 10 mm.

3. The electrostatic filter according to claim 1 or 2, further comprising an insulating material for insulating electricity between the first mesh and the second mesh.

4. The electrostatic filter according to any one of claims 1 to 3, characterized in that the second mesh is installed on the outdoor side and the first mesh is installed on the indoor side of the second mesh.

5. The electrostatic filter according to any one of claims 1 to 4, characterized in that the electrostatic filter is installed at the air inlet and / or outlet when performing first-class mechanical ventilation, second-class mechanical ventilation, or third-class mechanical ventilation of a building structure.

6. The electrostatic filter according to claim 5, characterized in that, when other filters are attached to the air inlet and / or outlet, the electrostatic filter is attached upstream of the airflow of the other filters.

7. The electrostatic filter according to any one of claims 1 to 6, characterized in that the mesh size of the aforementioned mesh is 16 mesh to 18 mesh.

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