Wire net for catch pollen by switching charged state and wire net screen with the same

Abstract

To provide a pollen catching performance-improved charged wire net screen 2d capable of easily catch negatively charged particles (negatively charged pollen 5d) when a wire net 12 is positively charged and positively charged particles (positively charged pollen 5c) when the wire net 12 is negatively charged by switching the charged state of the wire net 12 between positive and negative with the elapse of time.SOLUTION: Provided is a charged wire net screen 2b with a conductive net and a sash 8 for supporting the net, and the net repeats positive electrification and negative electrification with the elapse of time.SELECTED DRAWING: Figure 1C

Description

[Technical Field]

[0001] The present invention relates to a wire mesh that adsorbs pollen by switching its charged state, and a screen door equipped with the same. [Background technology]

[0002] Ventilation is important for preventing infectious diseases and keeping indoors comfortable, but if pollen enters a room through ventilation, as shown in Figure 1A(a), it can be a problem for people with hay fever (Non-Patent Document 1). Therefore, the present inventors have been conducting research and inventions to impart pollen adsorption properties to building materials, such as by electrically charging screen doors as shown in Figure 1A(b) to adsorb pollen that enters the room with the screen doors (Non-Patent Document 2, Patent Document 1).

[0003] Patent Document 2 describes an electrostatic dust collecting filter in which an insulating band for preventing leakage is provided around the periphery of the surface of a rectangular insulating plate, and strip-shaped electrode bands made of charged material are provided in the dust collection area inside the insulating band to form electrode sheets, and the electrode sheets are stacked with spacers sandwiched between them, and different voltages (-5 kV and earth potential) are applied to every other stacked electrode sheet.

[0004] Patent Document 3 describes a dust collecting device comprising an ion emitting means that emits ions, and a dust collecting section in which electrode plates of opposite polarity are alternately stacked with an insulator having a cell structure sandwiched between them.Furthermore, Patent Document 4 describes an air purifier having a main body with an air inlet and outlet and an air blower provided inside, a charging section that is provided within the main body close to the inlet and charges the inflowing dust that flows in from the inlet, a conductive mesh that is provided downstream of the charging section and is earthed, an electrically charged filter that is provided downstream of the earthed conductive mesh, and a conductive mesh that is provided downstream of the electrically charged filter and to which high voltage is applied. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-110278 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-281173 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-298660 [Patent Document 4] Japanese Patent Application Publication No. 1-266863 [Non-patent literature]

[0006] [Non-Patent Document 1] Hiromi Kiyosawa and Susumu Yoshizawa: Pollen Invasion and Radiation Exposure in Residential Buildings, Journal of Planning and Building Engineering, Architectural Institute of Japan, Vol.66, No.548, pp.63-68, October 2001 [Non-patent document 2] Tomoki Imaoka, Yosuke Ito, Shinji Kawabe: Measurement of Pollen Adsorption Performance of Electrified Wire Mesh for Screen Doors, Research Report of the Tokai Branch of the Architectural Institute of Japan, Vol. 60, pp. 25-28, February 2022 Summary of the Invention [Problem to be solved by the invention]

[0007] However, screen doors that use charged wire mesh to adsorb particles such as pollen in the air have the problem that when they are charged to a single polarity, they have difficulty adsorbing particles that are charged with the opposite polarity, and therefore are unable to exhibit sufficient pollen adsorption performance. Therefore, the present invention aims to provide a charged screen door with improved pollen adsorption performance by switching the charged state of the wire mesh between positive and negative over time, so that when the wire mesh is positively charged it is more likely to adsorb negatively charged particles (pollen), and when it is negatively charged it is more likely to adsorb positively charged particles (pollen). [Means for solving the problem]

[0008] The present invention, which solves the above problems, is as follows. [1] An electrically charged screen door consisting of a conductive mesh and a sash that supports the mesh, characterized in that the mesh alternates between positively and negatively charged states over time. A positively charged state refers to a state in which the conductive mesh is positively charged, and a negatively charged state refers to a state in which the conductive mesh is negatively charged. Also, a sash is the frame that supports the mesh. [2] The electrically charged screen door described in [1] is characterized in that the screen is in a grounded state when it switches from a positively charged state to a negatively charged state, or from a negatively charged state to a positively charged state. [3] An electrically charged screen door as described in [1] or [2], characterized in that the screen changes its charged state at a speed corresponding to the flow speed of the fluid around the screen. [4] The electrically charged screen door described in [1] or [2] is characterized in that the screen consists of two or more screens installed from the air inlet side to the air outlet side. That is, "made up of two or more meshes" means that it is made up of two or more meshes, such as the first, second, and third meshes, from the air inlet side to the air outlet side. [5] An electrically charged screen door as described in [4], characterized in that when the charged state of the screen changes over time, all of the screens are charged with the same polarity. [6] An electrically charged screen door characterized by comprising at least one screen as described in [1] or [2], at least one non-electrically charged screen that is installed closer to the air inlet side than the screen installed closest to the air inlet side among the screens, and a sash that supports all of the screens. [7] An electrically charged screen door as described in [1] or [2], characterized in that an insulator is sandwiched between the screen and the sash. [8] The electrically charged screen door described in [1] or [2] is characterized in that the sash has insulating properties. [Effects of the Invention]

[0009] According to the electrically charged screen door of the present invention, when the screen door is positively charged, it is more likely to adsorb negatively charged particles (pollen), and when it is negatively charged, it is more likely to adsorb positively charged particles (pollen). Furthermore, from the standpoint of ensuring transparency and running costs when put into practical use, there are significant benefits to adsorbing pollen with a single wire mesh compared to the two wire meshes disclosed in Patent Document 1, etc. [Brief explanation of the drawings]

[0010] [Figure 1A] This figure shows a schematic diagram of the situation around the openings of a house, showing (a) the entry of pollen through ventilation and (b) the adsorption of pollen by an electrically charged screen door. [Figure 1B] This is a diagram showing the principle of pollen adsorption when the wire mesh of a charged screen door is negatively charged. [Figure 1C] 10A and 10B are diagrams showing patterns for changing the charged state of a wire mesh according to one embodiment of the present invention. [Figure 1D] FIG. 1 is a diagram showing an electrically charged screen door according to one embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing an experimental apparatus used to evaluate the present invention. [Figure 3] FIG. 10 is a diagram showing an enlarged view of the pollen adsorption part of the experimental device. [Figure 4] FIG. 10 is a diagram showing the observation surface of the stack plate of the experimental device. [Figure 5] FIG. 10 is a diagram showing a voltage switching device of the experimental device. [Figure 6] FIG. 10 is a diagram showing the applied state of the electrode mesh of the experimental device. [Figure 7] FIG. 10 is a diagram showing the relationship between the number of deposits and the interval at a voltage absolute value of 1.0 kV. [Figure 8] FIG. 10 is a diagram showing the relationship between the number of deposits and the interval at a voltage absolute value of 2.0 kV. [Figure 9] FIG. 10 is a diagram showing the relationship between deposition reduction rate and spacing. [Figure 10] FIG. 10 is a diagram showing the relationship between the number of deposited particles and the absolute value of the voltage (interval 15 r / min). [Figure 11] FIG. 10 is a diagram showing the relationship between the number of deposited particles and the absolute value of the voltage (interval 30 r / min). [Figure 12] FIG. 10 is a diagram showing the relationship between the number of deposited particles and the absolute value of the voltage (interval 90 r / min). [Figure 13] FIG. 10 is a diagram showing the relationship between the number of deposited particles and the absolute value of the voltage (interval 150 r / min). DETAILED DESCRIPTION OF THE INVENTION

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

[0012] As shown in Figure 1A(a), even if a screen door 2 is installed at the opening of a building structure, such as a house, indoors 1, pollen 5 can enter due to the airflow 3 caused by ventilation. The indoors can be divided into an air inlet side 6a and an air outlet side 6b, separated by the screen door 2. As shown in Figure 1A(b), by applying a voltage from a power source 4 via a conductor 7 to the screen door 2, the screen door 2 becomes electrically charged, 2a, and pollen 5 attempting to enter the indoors 1 can be adsorbed by the electrically charged screen door 2a.

[0013] The wire mesh 12 of the screen door 2 is positively or negatively charged to form the charged wire mesh 12a. When the wire mesh 12a attracts pollen 5, it is less likely to attract pollen 5 that is charged with the same polarity as the wire mesh 12a. As shown in Figure 1B(a), the pollen 5 carried by the wind 3' includes both positively and negatively charged pollen. As shown in Figure 1B(b), if the pollen 5 that attracts the wire mesh 12a is called pollen 5a and the pollen 5 that passes through the wire mesh 12a is called pollen 5b, then if there is a lot of pollen 5 that is charged with the same polarity as the wire mesh 12a, there will be less pollen 5a and more pollen 5b. Furthermore, if there is a lot of pollen 5 that is charged with the opposite polarity to the wire mesh 12a, there will be more pollen 5a and less pollen 5b.

[0014] Reducing the number of wire meshes 12 from two to one, as disclosed in Patent Document 1 and elsewhere, offers significant benefits in terms of ensuring transparency and reducing running costs when put into practical use. Therefore, in one embodiment of the present invention, in order to adsorb both positively charged pollen 5c and negatively charged pollen 5d with a single wire mesh 12, one wire mesh 12 is charged in one cycle: positive → ground → negative → ground. As shown in FIG. 1C , the charge state of the wire mesh 12 is changed, for example, from positively charged wire mesh 12b to grounded wire mesh 12c, from grounded wire mesh 12c to negatively charged wire mesh 12d, from negatively charged wire mesh 12d to grounded wire mesh 12c, and from grounded wire mesh 12c to positively charged wire mesh 12b. These changes are repeated to form a change pattern. Furthermore, the order of positive, ground, negative, and ground can be any as long as the ground is placed between the positive and negative states. The change pattern can start from either the positive, ground, or negative state. By grounding the positively or negatively charged wire mesh 12a, that is, by sandwiching the ground when switching the voltage, it is possible to prevent short circuits when switching the voltage. When the wire mesh 12a is positively or negatively charged and the positively charged wire mesh 12b is positively charged, the more positively charged pollen 5c there is, the less pollen 5a there is and the more pollen 5b there is. On the other hand, the more negatively charged pollen 5d there is, the more pollen 5a there is and the less pollen 5b there is.

[0015] As shown in FIG. 1D, a charged screen door 2b according to one embodiment of the present invention includes a wire mesh 12 and a sash 8 supporting the periphery of the wire mesh 12. The wire mesh 12 is electrically charged via a power outlet 4a, a conductor 7a, a power supply 4b capable of switching the wire mesh's voltage between positive, negative, and ground, and then a conductor 7b. A seal 9 is provided at the connection between the conductor 7b and the wire mesh 12. This seal 9 is used to supply or remove voltage to the wire mesh to set it to a positive, negative, or grounded state. The wire mesh 12 is a typical example of a conductive mesh, but any conductive mesh may be made of plastic or carbon, for example. An insulator (not shown) may be sandwiched between the mesh 12 and the sash 8. The sash 8 may also be insulating, preventing electrical leakage when the wire mesh 12 becomes charged. [Example]

[0016] (wire mesh) Table 1 shows the types of wire mesh. For the wire mesh, we use plain woven stainless steel wire mesh, which is often used for screen doors. The stainless steel wire mesh used is within the range specified in JISA4709:2018, and is readily available on the market with a mesh size of 16 and wire diameters of 0.3, 0.4, or 0.5 mm.

[0017] [Table 1]

[0018] (pseudo pollen) Lycopodium, a pseudo-pollen commonly used in pollen dispersal research, was used as the pollen. The average particle size of Lycopodium was approximately 35 μm, and the true density was 1.05 g / cm. 3 is.

[0019] (DC high voltage power supply) A DC high-voltage power supply (KTK-125P, KTK-125N, manufactured by K Co.) was used to apply voltage to the stainless steel wire 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 ±20.0 kV in 0.1 kV increments.

[0020] [Table 2]

[0021] (Experimental equipment) Figure 2 shows the experimental apparatus 10 used in the present invention. The experimental apparatus 10 is composed of a diffusion device 11 for evenly diffusing pollen separated by a wooden frame 17, a pollen adsorption unit 13 that adsorbs pollen using an electrically charged wire mesh, a DC high-voltage power supply 14 for supplying electricity to the wire mesh, and a voltage switching device 15 connected to the DC high-voltage power supply 14 and the pollen adsorption unit 13 for switching the positive and negative voltages.

[0022] In the diffusion device 11, pollen placed at the nozzle 18 in the center of the device is diffused by air blown out from the blower 16. The diffused pollen settles due to gravity within the device 11. The electricity supplied from the DC high-voltage power supply 14 is switched between positive and negative by the voltage switching device 15 and is supplied to the wire mesh 12e of the pollen adsorption section 13, which then charges the wire mesh 12e. The charged wire mesh 12e adsorbs the pollen that settles due to gravity.

[0023] Figure 3 shows an enlarged view of the pollen adsorption unit 13. In the pollen adsorption unit 13, a wire mesh 12e is sandwiched between electrically insulating U-shaped resin 22, with a deposition plate 23 installed below. Pollen not adsorbed by the wire mesh 12e is collected by the deposition plate 23. Figure 4 shows the observation surface 24 of the deposition plate 23. As shown in Figure 4, the dimensions of the deposition plate 23 are 200 (a1) x 200 (a2) mm, and nine observation surfaces 24 measuring 1.5 x 1.5 mm are provided. The wire mesh is positioned 50 (a3) mm above the deposition plate 23 (a4: 5 mm), and a resin intrusion prevention plate 21 is attached to the side to prevent pollen from entering. One of the short side ends of the wire mesh 12e is fixed so that it protrudes from the U-shaped resin 22, and is connected to the voltage switching device 15 with a conductor 19 for application.

[0024] Figure 5 shows an enlarged view of the voltage switching device 15. Aluminum foil 26 is attached to an L-shaped rod 25 made of chrome vanadium steel, which is connected to the wire mesh 12e of the pollen adsorption unit 13. As the L-shaped rod 25, which is connected to the rotating shaft of the motor 31, rotates, the aluminum foil 26, which is connected to the conductor 19, comes into contact with the electrode wire mesh 27, which is applied with a different voltage, switching the positive and negative voltages. The rotating shaft of the motor 31 is covered with a plastic cap 30. The electrode wire mesh 27 is made of 40 mesh. The rotation speed of the L-shaped rod 25 can be controlled within the range of 15 to 266 r / min.

[0025] Figure 6 shows the voltage applied to the electrode mesh 27. An electrically insulating rubber sheet 28 is attached to a 200 x 200 mm wooden board 28 to prevent leakage from the charged electrode mesh 27. To prevent current flow between the electrodes 27, the electrodes 27 are spaced 10 (d3) mm apart (d2: 50 mm, d1: 40 mm). As the L-shaped rod 25 rotates, the aluminum foil 26 comes into contact with the positively charged electrode mesh 40, the grounded electrode mesh 42, the negatively charged electrode mesh 41, and the grounded electrode mesh 42 in that order. This constitutes one cycle, ensuring that the voltage applied to the mesh 12e of the pollen adsorption section is accurately switched. The switching interval (hereafter referred to as the interval) of the voltage applied to the mesh 12e is evaluated using the rotation speed (r / min) of the L-shaped rod 25. The voltage is switched by the electrode wire mesh 27, motor 31, circuit 20, etc. In other words, the charged state of the charged wire mesh 12d can be adjusted by the electrode wire mesh 27, motor 31, circuit 20, etc. Therefore, the charged state of the charged wire mesh 12d can be changed according to the wind flow speed. For example, when the wind flow speed is high, the time for one cycle of the charged wire mesh can be shortened to improve pollen adsorption performance. On the other hand, when the wind flow speed is low, the cycle time can be lengthened. Furthermore, the adsorption performance for pollen with a polarity opposite to that of the charge of the wire mesh can be improved by adjusting the positive or negative spacing of the wire mesh based on the proportion of positively charged pollen and negatively charged pollen in the total pollen.

[0026] 0.500 g of pollen is placed at the nozzle 18 inside the device 11. Five seconds after the application of voltage to the wire mesh 12e begins, air is blown in by the fan 16 to diffuse the pollen inside the device 11. After the pollen has been diffused, the device is left to stand for three minutes. After the stand, the application of voltage is stopped, and the nine observation surfaces 24 of the accumulation plate 23 are immediately observed with a microscope to count the number of pollen particles deposited on the observation surfaces 24 (hereinafter referred to as the accumulated number). The measurement is carried out indoors at a temperature of 20-24°C and a humidity of 50-55%.

[0027] (Experimental Method) 0.500 g of pollen is placed at the nozzle 18 inside the device. Five seconds after the application of voltage to the wire mesh 12e begins, air is blown in by the fan 16 to diffuse the pollen inside the device 11. After the pollen has been diffused, the device is left to stand for three minutes. After the device is left to stand, the application of voltage is stopped, and the nine observation surfaces 24 of the accumulation plate 23 are immediately observed with a microscope to count the number of pollen grains accumulated on the observation surfaces 24 (hereinafter referred to as the accumulated number). The measurement is carried out indoors at a temperature of 20-24°C and a humidity of 50-55%.

[0028] (Evaluation method) The pollen adsorption performance is evaluated by the rate of decrease in the number of deposited particles under each condition from an absolute voltage value of 0.0 kV (hereinafter referred to as the deposition reduction rate). The deposition number N0 at an absolute voltage value of 0.0 kV is multiplied by the deposition number N at absolute voltage values of 1.0 kV and 2.0 kV. p When , the deposition reduction rate R (%) is expressed by equation (1). (Number 1) TIFF2025117374000004.tif1157 It is considered that the larger the number of accumulated particles, the less pollen particles are adsorbed on the wire mesh and the more pollen particles pass through the wire mesh 12e. p The smaller the value, the higher the deposition reduction rate R, and it is considered that the pollen is adsorbed by the wire mesh 12e, so the pollen adsorption performance is evaluated as high.

[0029] (Experimental results and discussion) The relationship between the number of deposits and the spacing is shown in Figure 7 for a voltage absolute value of 1.0 kV, and in Figure 8 for a voltage absolute value of 2.0 kV. In the mesh only case, the wire mesh 12e is not charged and is grounded, and in the no voltage switching case, only a negative voltage is applied.

[0030] 7 and 8, when only a mesh is used, i.e., when the absolute voltage value is 0.0 kV, the number of deposited particles decreases as the wire diameter increases. This is thought to be because, according to Non-Patent Document 2, increasing the wire diameter reduces the opening ratio of wire mesh 12e, and even if wire mesh 12e is not charged, pollen accumulates on the wire mesh, thereby increasing the effect of reducing the number of particles deposited on deposition plate 23.

[0031] At a voltage absolute value of 1.0 kV, switching the voltage between positive and negative resulted in a decrease in the number of deposited pollen grains compared to when the voltage was not switched, regardless of the wire diameter. Here, there was concern that pollen attached to the wire mesh 12e might detach from the wire mesh 12e when the wire mesh was grounded, but switching the voltage did not result in an increase in the number of deposited pollen grains. Considering pollen as a dielectric, it is believed that the pollen attached to the wire mesh 12e is attached to the wire mesh 12e by the polarization force generated by dielectric polarization. Because the pollen is dielectrically polarized when the wire mesh 12e is in a charged state, when the wire mesh 12e changes from a charged state to a grounded state, an electric image force acts between the pollen and the wire mesh 12e, which is thought to prevent the pollen attached to the wire mesh 12e from detaching from the wire mesh 12e even when the wire mesh is grounded.

[0032] The number of deposited particles gradually decreases as the interval increases to 15 r / min, 30 r / min, and 90 r / min. The amount of pollen adsorption is affected by the distance between the charged material and the pollen. Therefore, when the voltage is switched one cycle within the distance at which pollen adsorption performance can be demonstrated, it is thought that both positively and negatively charged pollen are more likely to be adsorbed. From this, the decrease in the number of deposited particles when the interval is 90 r / min or less can be used to estimate the distance at which pollen adsorption performance can be demonstrated. When the estimated time required for one cycle is t and the terminal settling velocity of the pollen is v, the range r that is affected by pollen adsorption is expressed by equation (2). (Number 2) TIFF2025117374000005.tif658 Here, v is 28.23 mm / s, and when the spacing is 90 r / min, t is 0.67 s. Therefore, under the conditions of the present invention, r is considered to be approximately 19 mm or less. If the voltage is switched slowly within the range where attraction has an effect, the effect of attraction due to positive charging becomes greater, and it is thought that the number of deposited particles will be greater than if the voltage is not switched.

[0033] At a voltage absolute value of 2.0 kV, the number of deposited particles gradually decreases as the interval increases from 15 r / min to 30 r / min and 90 r / min, similar to the case of 1.0 kV. However, under some conditions, the number of deposited particles at intervals of 15 r / min and 30 r / min is greater than the number of deposited particles when there is no voltage switching. Non-patent document 2 has revealed that, regardless of the absolute value of the voltage, the number of deposited particles on a negatively charged wire mesh is less than that on a positively charged wire mesh. Therefore, it is thought that when the voltage is switched slowly within the range that is affected by pollen adsorption, the effect of adsorption due to positive charging becomes greater, resulting in a greater number of deposited particles than when there is no voltage switching.

[0034] Figures 7 and 8 show the relationship between deposition reduction rate and spacing for a wire diameter of 0.3 mm, where switching the voltage does not significantly improve pollen adsorption performance, and a wire diameter of 0.5 mm, where switching the voltage most significantly improves pollen adsorption performance.

[0035] Figure 9 shows that, with some exceptions, shortening the spacing increases the deposition reduction rate compared to when no voltage switching is used. Regardless of the voltage, the deposition reduction rate is in the 40% range when the spacing is 90 r / min or higher, reaching a maximum of 50% when the wire diameter is 0.3 mm, the voltage absolute value is 1.0 kV, and the spacing is 90 r / min. The deposition reduction rate due to voltage switching increases with increasing wire diameter. The deposition reduction rate is most improved by voltage switching when the wire diameter is 0.5 mm, the voltage absolute value is 1.0 kV, and the spacing is 90 r / min, with an increase of 26 points. Furthermore, if N0 in equation (1) is the number of deposited particles without a mesh, the deposition reduction rate is 67% when the wire diameter is 0.5 mm, the voltage absolute value is 1.0 kV, and the spacing is 90 r / min. This shows that the charged wire mesh of the present invention can reduce the amount of pollen entering through the openings by up to 67%.

[0036] Regarding the relationship between the number of accumulated particles and the absolute value of the voltage, Fig. 10 shows the case of an interval of 15 r / min, Fig. 11 shows the case of 30 r / min, Fig. 12 shows the case of 90 r / min, and Fig. 13 shows the case of 150 r / min.

[0037] Figures 10 to 13 show that the number of deposited particles decreases for all wire diameters when the voltage absolute value is 1.0 kV compared to when the voltage absolute value is 0.0 kV. However, when the voltage absolute value is 2.0 kV, the number of deposited particles hardly changes compared to when the voltage absolute value is 1.0 kV. Considering that Figures 7 and 8 show that the number of deposited particles is lower at an absolute voltage of 2.0 kV than at an absolute voltage of 1.0 kV when there is no switching, the effect of switching the voltage on reducing the number of deposited particles is greater at an absolute voltage of 1.0 kV than at an absolute voltage of 2.0 kV.

[0038] (summary) The following was found within the measurement range of the present invention. (1) Except under certain conditions, the number of deposited particles decreases when the voltage is switched between positive and negative. (2) Regardless of the voltage, the deposition reduction rate is in the 40% range when the interval is 90 r / min or more, and reaches a maximum of 50% when the wire diameter is 0.3 mm, the voltage absolute value is 1.0 kV, and the interval is 90 r / min. (3) The deposition reduction rate due to voltage switching increases with increasing wire diameter. The deposition reduction rate is most improved by voltage switching when the wire diameter is 0.5 mm, the voltage absolute value is 1.0 kV, and the interval is 90 r / min, with an increase of 26 points. (4) The charged wire mesh 12e of the present invention can reduce the amount of pollen entering through the openings by up to 67%. (5) The effect of voltage switching on reducing the number of deposited particles is greater when the voltage absolute value is 1.0 kV than when the voltage absolute value is 2.0 kV.

[0039] In the above embodiment, there is one wire mesh, but two or more wire meshes may be used. The effect is to weaken the wind speed with the first wire mesh, making it easier for the second mesh to adsorb pollen. Therefore, the first mesh does not necessarily need to be charged. Also, when the charging state changes over time, if all meshes are charged with the same polarity, one power supply can be used. [Industrial Applicability]

[0040] The performance of screen doors can be improved by installing charged screen doors at openings. [Explanation of symbols]

[0041] 1:Indoor 2:Screen door 2a, 2b: Electrified screen door 3: Air flow 3´:Wind 4: Power supply 4a: Outlet 4b: Power supply 5: Pollen 5a: Adsorbed pollen 5b: Passed pollen 5c: Positively charged pollen 5d: Negatively charged pollen 6a: Air inlet side 6b: Air outlet side 7, 7a, 7b: Conductor 8: Sash 9: Sticker 10: Experimental equipment 11: Diffusion device 12, 12e: Wire mesh 12a: Positively or negatively charged wire mesh 12b: Positively charged wire mesh 12c: Grounded wire mesh 12d: Negatively charged wire mesh 13: Pollen adsorption part 14: DC high voltage power supply 15: Voltage switching device 16: Blower 17: Wooden frame 18: Spout 19: Conductor 20: Circuit 21: Resin intrusion prevention plate 22: U-shaped resin 23: Deposit plate 24: Observation surface 25:L-shaped rod 26: Aluminum foil 27: Electrode mesh 28: Wooden board 29: Rubber plate 30: Resin cap 31: Motor 40: Positively applied electrode mesh 41: Negatively applied electrode wire mesh 42: Grounded electrode mesh

Claims

1. This electrically charged screen door is made up of a conductive net and a sash that supports the net, and is characterized in that the net alternates between a positively charged state and a negatively charged state over time.

2. 2. The electrically charged screen door according to claim 1, wherein the screen is grounded when it switches from a positively charged state to a negatively charged state or from a negatively charged state to a positively charged state.

3. 3. An electrically charged screen door according to claim 1, wherein the screen changes its state of charge at a speed corresponding to the flow speed of the fluid around the screen.

4. 3. The electrically charged screen door according to claim 1, wherein the screen comprises two or more screens arranged from the air inlet side toward the air outlet side.

5. 5. An electrically charged screen door according to claim 4, wherein when the charged state of the screen changes over time, all of the screens are charged to the same polarity.

6. A charged screen door characterized by comprising at least one screen as claimed in claim 1 or 2, at least one uncharged screen installed closer to the air inlet side than the screen installed closest to the air inlet side among the screens, and a sash supporting all of the screens.

7. 3. The electrically charged screen door according to claim 1, wherein an insulator is sandwiched between the screen and the sash.

8. 3. An electrically charged screen door according to claim 1 or 2, wherein the sash has insulating properties.

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