TW202120192A - Electric field device, gas purification device and purification method - Google Patents

Abstract

An electric field device, a gas purification device, and a purification method, wherein the electric field device includes a dust collector and a discharge electrode, the dust collector includes a conductive layer and an electret unit, the electret unit is arranged on the discharge electrode and The active electric field formed by the conductive layer. It can solve the problems of large electric field device, ignition failure, and ozone odor, realize the advantages of low cost, low energy consumption, and miniaturization, improve the electret performance of the electret unit, realize continuous electret, and avoid uneven electret, increase the dust area and the dust efficiency.

Description

Electric field device, gas purification device and purification method

The invention relates to the field of environmental protection, in particular to an electric field device, a gas purification device and a purification method.

The current mainstream dust removal and purification technologies are filtration and electrostatic adsorption, which have been widely used in fields such as masks, air purifiers, commercial air conditioning filtration, industrial oil fume filtration, vehicle exhaust gas purifiers, and boiler flue gas dust collectors. Among them, the filtration is divided into primary efficiency, medium efficiency, high efficiency, and ultra high efficiency filtration. The main indicators are dust holding rate and filtration efficiency. In order to achieve high efficiency filtration, the filter material of the screening program consumes huge amounts of resistance, and the energy consumption is very high. The electrostatic screening program cannot be widely used due to the instantaneous failure of ignition and the peculiar smell caused by ozone. At the same time, the electrostatic adsorption dust collector has problems such as large volume and high price. If it can solve the problems of high energy consumption, low efficiency, and low dust holding rate, and solve the problems of large size of the electrostatic screening program, failure of ignition, and generation of ozone odor, it will give full play to the advantages of filtration, overcome the problem of static electricity, and give full play to the advantages of static electricity. The new device, which embodies the technical advantages of low cost, low energy consumption, and miniaturization, will be widely recognized.

Therefore, the purpose of the present invention is to provide an electric field device, a gas purification device, and a purification method to solve the following technical problems: the electric field device is large in size, fails to ignite, generates ozone odor, and achieves low cost, low energy consumption, The advantages of miniaturization technology improve the electret performance of the electret unit, realize continuous electrets, avoid uneven electrets, increase dust accumulation area, and improve dust accumulation efficiency. In order to achieve the above objectives and other related objectives, the present invention provides the following examples:

In one aspect of the present invention, an electric field device is provided. The electric field device includes a dust collector and a discharge electrode, the dust collector includes a conductive layer and an electret unit, and the electret unit is arranged on the discharge electrode and the discharge electrode. The active electric field formed by the conductive layer.

In one embodiment, the conductive layer has a first surface facing the discharge electrode and a second surface opposite to the first surface, and the electret unit is arranged on the first surface of the conductive layer. At least a part of the surface and/or at least a part of the second surface.

In one embodiment, the dust collector includes a plurality of the electret units, and the plurality of the electret units are arranged on the first part of the conductive layer with a predetermined distance therebetween. At least a part of a surface and/or at least a part of the second surface.

In one embodiment, the electret unit is attached to at least a part of the first surface and/or at least a part of the second surface of the conductive layer.

In one embodiment, there is a gap between the electret unit and at least a part of the first surface of the conductive layer, and/or the electret unit and the second surface of the conductive layer There is a gap between at least a part of the surface.

In an embodiment, the dust collector includes at least one of the conductive layer and at least one of the electret units, and the electret units and the conductive layers are alternately arranged.

In one embodiment, the electret unit and the conductive layer are alternately spliced and arranged in the axial direction, or in the circumferential direction, or in the same plane.

In one embodiment, the electret unit includes a first narrow portion and a first wide portion, the conductive layer includes a second narrow portion and a second wide portion, and the first narrow portion of the electret unit Is arranged next to the second wide portion of the conductive layer, the first wide portion of the electret unit is arranged next to the second narrow portion of the conductive layer, the electret unit and the The conductive layers are arranged in a zigzag alternate splicing arrangement.

In one embodiment, the active electric field electrets the electret unit.

In an embodiment, the electret time of the active electric field to the electret unit is greater than or equal to 10s.

In one embodiment, the electret time given to the electret unit by the active electric field is greater than or equal to 1 min.

In an embodiment, the electret time of the active electric field to the electret unit is greater than or equal to 5 minutes.

In one embodiment, the electret time given to the electret unit by the active electric field is greater than or equal to 10 minutes.

In one embodiment, the active electric field is used to remove dust while electret the electret unit.

In one embodiment, the active electric field is an active electric field that is periodically turned on and off.

In one embodiment, when the electret voltage of the electret unit is reduced to the first voltage preset value, the active electric field is used to elect the electret unit.

In an embodiment, the preset value of the first voltage is less than 0.2 kV, or less than 0.1 kV, or equal to 0V.

In one embodiment, when the electret voltage of the electret unit reaches the second voltage preset value, the electret electric field of the electret unit is used to remove dust.

In one embodiment, the preset value of the second voltage is greater than or equal to 0.2 kV, or greater than or equal to 0.5 kV, or greater than or equal to 2 kV.

In one embodiment, the airflow in the electric field device passes through the dust collector in a side-flow type or a through type.

In one embodiment, the electret unit and/or the conductive layer have a porous structure.

In one embodiment, the electret unit has a porous structure that overlaps and penetrates each other.

In one embodiment, the electric field device further includes an insulation mechanism for supporting the dust collecting electrode and the discharge electrode to achieve insulation between the dust collecting electrode and the discharge electrode.

In one embodiment, the electric field device further includes an ozone detector, and the ozone detector is used to detect the ozone emission amount of the electric field device.

One aspect of the present invention provides a gas purification device, characterized in that the gas purification device includes a gas inlet for gas to enter the gas purification device, a gas outlet for gas to leave the gas purification device, and a purification module, The purification module includes one or more electric field devices as described in any of the above embodiments.

In one aspect of the present invention, a purification method is provided, characterized in that the purification method includes the following steps: using an active electric field to remove dust while electret units are electret.

In one embodiment, the method includes the following steps:

Step 1: Elect the electret unit while using the active electric field to remove dust;

Step 2: When the electret voltage of the electret unit reaches the second voltage preset value, the electret electric field of the electret unit is used to remove dust.

In one embodiment, the method includes the following steps:

Step 1: Elect the electret unit while using the active electric field to remove dust;

Step 2: When the electret voltage of the electret unit reaches the second voltage preset value, use the electret electric field of the electret unit to remove dust and turn off the active electric field;

Step 3. When the electret voltage of the electret unit is reduced to the first voltage preset value, the active electric field is turned on, and the active electric field is used to remove dust and simultaneously stabilize the electret unit. pole.

In one embodiment, the method includes the following steps:

Step 1: Elect the electret unit while using the active electric field to remove dust;

Step 2: When the active electric field fails, the electret electric field of the electret unit is used to remove dust.

In one embodiment, the method includes the following steps:

Step 1: Elect the electret unit while using the active electric field to remove dust;

Step 2: When the ozone emission exceeds the preset value of ozone, turn off the active electric field;

Step 3: Use the electret electric field of the electret unit to remove dust;

Step 4: When the electret voltage of the electret unit is reduced to the first voltage preset value, turn on the active electric field, and electret the electret unit while removing dust by the active electric field;

Step 5. Control the ozone emission to not exceed the preset value of ozone.

In one embodiment, the preset value of the second voltage is greater than or equal to 0.2 kV, or greater than or equal to 0.5 kV, or greater than or equal to 2 kV.

In an embodiment, the preset value of the first voltage is less than 0.2 kV, or less than 0.1 kV, or equal to 0V.

In one embodiment, the preset value of ozone is 50-200 micrograms/cubic meter.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so as to understand the purpose, features and advantages of the present invention more clearly. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but merely to illustrate the essential spirit of the technical solution of the present invention.

In the following description, for the purpose of illustrating various disclosed embodiments, certain specific details are set forth to provide a thorough understanding of various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other situations, well-known devices, structures, and technologies associated with the present application may not be shown or described in detail so as to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification, reference to "one embodiment" or "an embodiment" means that a specific feature, structure, or characteristic described in combination with the embodiment is included in at least one embodiment. Therefore, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification need not all refer to the same embodiment. In addition, specific features, structures, or characteristics can be combined in any manner in one or more embodiments.

In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "rear", "left", "right", "outer", "inner" should be used. "", "outward", "inward", "上", "下" and other words are understood as convenient terms and should not be understood as restrictive terms.

According to one aspect of the present invention, there is provided an electric field device, including a dust collector and a discharge electrode, the dust collector includes a conductive layer and an electret unit, the electret unit is arranged in the active electric field formed by the conductive layer and the discharge electrode . The active electric field refers to the active electric field that can produce corona discharge, that is, the electric field strength of the active electric field needs to exceed the ionization field strength of the medium between the conductive layer and the discharge electrode, so that the conductive layer and the discharge electrode The surrounding medium is ionized and excited, and then corona discharge occurs, so that a large amount of space charge exists between the conductive layer and the discharge electrode and the space around it, and the space charge is mainly manifested as a large amount of accumulated single-polar ions. The electret unit is arranged in the active electric field formed by the conductive layer and the discharge electrode, that is to say, there is a large amount of space charge generated by the corona discharge around the electret unit, and this space charge can elect the electret unit, The electret unit after the electret can form an electret electric field in the surrounding space.

It should be noted that the active electric field in the electric field device can only elect the electret unit, and the electrostatic adsorption effect of the electret electric field is used for dust removal and purification. The active electric field in the electric field device can also elect the electret unit and perform dust removal and purification at the same time. After the electret unit is electret, the electret electric field can assist the dust removal and purification; when the active electric field fails or is closed, use The electrostatic adsorption of the electret electric field performs dust removal and purification. Among them, when the active electric field is used for dust removal and purification, the space charge generated by the corona discharge between the conductive layer and the discharge electrode combines with the particulate matter to charge the particulate matter, and the conductive layer exerts an attractive force on the charged particulate matter, thereby achieving the reduction of the particulate matter. collect.

1, the conductive layer 11 has a first surface facing the discharge electrode 2 and a second surface opposite to the first surface, and the electret unit 12 is arranged on at least a part of the first surface and/or the second surface of the conductive layer 11 At least part of. This design can improve the electret performance of the electret unit, avoid uneven electrets, improve the efficiency of dust accumulation, and can also realize continuous electrets of the electret unit, that is, after the electret electric field of the electret unit disappears , No need to replace the electret unit to achieve in-situ electret. In this embodiment, the electret unit 12 is attached to the entire first surface of the conductive layer 11. The attachment method can be selected from glue, tenon and tenon fixing, rivet fixing, or other mechanical fixing methods. Tenon and tenon fixation can be to fix the auxiliary adsorption mechanism on the frame first, and then fix the frame and the electric field unit with tenon and tenon. However, those skilled in the art can understand that due to the limitation of actual processing conditions, the electret unit 12 There may be a certain gap when it is attached to the conductive layer 11, and the gap can be ignored. In other embodiments, the electret unit may also be attached to a part of the first surface of the conductive layer, or may be attached to a part or all of the second surface of the conductive layer, or may be attached to the first surface of the conductive layer. At least a part of one surface has a gap arrangement, or it can have a gap arrangement with at least a part of the second surface of the conductive layer. When the electret unit and the conductive layer have a gap arrangement, the electret performance of the electret unit can be significantly improved, Realize continuous electret and improve dust collection efficiency. In other embodiments, the dust collector may include a plurality of electret units, and the plurality of electret units are arranged on at least a part of the first surface and/or the first surface of the conductive layer with a predetermined distance therebetween. At least a part of the two surfaces to increase the dust collection area of the electret unit. In other embodiments, the electret unit may also be arranged on a part or all of the first surface and a part or all of the second surface of the conductive layer at the same time.

1, the discharge electrode 2 is electrically connected to the cathode of the power supply, and the conductive layer 11 is electrically connected to the anode of the power supply. The discharge electrode 2 and the conductive layer 11 form an active electric field. There is a large amount of space charge in the space. The space charge is mainly manifested as a large number of accumulated single-polar ions. The space charge can electret the electret unit 12, making the electret voltage of the electret unit 12 negative. The electret unit 12 can form an electret electric field in the surrounding space. However, in other embodiments, the discharge electrode 2 may also be electrically connected to the anode of the power source, and the conductive layer 11 may also be electrically connected to the cathode of the power source. The electret voltage of the electret unit 12 after the electret is positive, and the electret voltage is positive. The latter electret unit 12 can form an electret electric field in the surrounding space. It should be noted that the positive and negative values of the electret voltage are only relative concepts. For example, depending on the polarity of the power supply that is electrically connected to the discharge electrode, the electret voltage of 0.2kV mentioned in the article can represent +0.2kV or -0.2kV.

1, the active electric field formed by the discharge electrode 2 and the conductive layer 11 is preferably an active electric field that is periodically turned on and off, that is, the power supply electrically connected to the discharge electrode 2 and the conductive layer 11 is a power supply that is periodically turned on and off. When the active electric field is turned on, the active electric field performs dust removal and purification on the electret unit 12 at the same time; when the active electric field is turned off or fails, the electrostatic adsorption effect of the electret electric field is used for dust removal and purification. In other embodiments, when the active electric field is turned on, the active electric field electrets the electret unit; when the active electric field is turned off, the electrostatic adsorption effect of the electret electric field is used for dust removal and purification. In other embodiments, the active electric field formed by the discharge electrode and the conductive layer may also be a continuously conductive electric field. When the active electric field is turned on, the active electric field electrets the electret unit and performs dust removal and purification at the same time; When the electric field fails, the electrostatic adsorption effect of the electret electric field is used for dust removal and purification. Using active electric field and electret electric field to alternate dust removal can reduce ozone odor, achieve low cost and low energy consumption, and when the active electric field fails, the electret electric field can continue to remove dust to solve the sudden failure of the active electric field or the failure of ignition. The problem.

1, the distance between the conductive layer 11 and the discharge electrode 2 is 15-25mm. Since the electret unit 12 is attached to the side of the conductive layer 11 opposite to the discharge electrode 2 and the electret unit 12 is a thin film, the electret The thickness of the body unit 12 is negligible, that is, the distance between the electret unit 12 and the discharge electrode 2 is 15-25 mm. The distance between the conductive layer 11 and the discharge electrode 2 is related to the voltage of the power supply. Based on the breakdown discharge limit, corona discharge conditions and dust accumulation efficiency, when the distance between the conductive layer 11 and the discharge electrode 2 is 15-25mm When the power supply voltage is 10-15kV. However, those skilled in the art can understand that there is a certain preset distance between the conductive layer and the discharge electrode, the distance between the conductive layer and the discharge electrode can also be closer, and the voltage of the power supply can be set lower; or The distance between the conductive layer and the discharge electrode can also be farther, and the voltage of the power supply can be set higher.

1, the conductive layer 11 and the discharge electrode 2 can be metal and/or alloy, and the electret unit 12 is polytetrafluoroethylene, or polypropylene, or other inorganic compounds with electret properties and/or has electret properties The organic compound, specifically, the inorganic compound with electret properties can be selected from one or more of silicon dioxide, barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminum oxide, titanium oxide, and silicon nitride In combination, the organic compound with electret properties can be selected from one or more combinations of fluorocarbon polymers, polycarbonate, polypropylene, polyethylene, polyvinyl chloride, natural wax, resin, and rosin, more specifically, fluorocarbon The polymer is selected from one or more combinations of polytetrafluoroethylene, polyvinylidene fluoride, polyperfluoroethylene propylene, soluble polyperfluoroethylene propylene, and soluble polytetrafluoroethylene.

1, in this embodiment, the electret unit 12 is two layers of polytetrafluoroethylene film, each layer of polytetrafluoroethylene film has a porous structure, and the two layers of polytetrafluoroethylene film form a porous structure overlapping each other. The conductive layer 11 is a stainless steel mesh, and the electret unit 12 is glued to the entire first surface of the conductive layer 11 using a flat glue process. The air flow through the dust collector 1 is a through type, that is, the direction of the air flow Preferably, it is perpendicular to the dust collector 1, and the airflow passes through the electret unit 12 and the porous structure on the conductive layer 11. However, those skilled in the art can understand that the airflow direction can also be any direction that is not parallel to the dust collector. The porous structure that passes through the direction and overlaps and penetrates each other can also filter some large particles by means of physical filtration. In other embodiments, the conductive layer may be a dense material, and the air flow through the dust collecting electrode is a side-flow type, that is to say, the gas flow direction is preferably parallel to the dust collecting electrode 1. However, those skilled in the art can understand that , The airflow direction can also flow in any direction that is not perpendicular to the dust accumulation.

When the active electric field formed by the discharge electrode 2 and the conductive layer 11 is an active electric field that is periodically on and off, when the active electric field is turned on, the active electric field can simultaneously electret and dust the electret unit 12; the active electric field When it is closed or invalid, the electrostatic adsorption effect of the electret electric field is used for dust removal and purification. When the active electric field is used for dust removal and purification, the space charge generated by the conductive layer 11 and the discharge electrode 2 due to the corona discharge combines with the particles to charge the particles, and the conductive layer exerts an attraction force on the charged particles to realize the collection of the particles. Regardless of whether the air flow through the dust collector 1 is a side-flow type or a through-type, since the electret unit 12 has a porous structure, when the active electric field is used for dust removal and purification, the electret unit 12 is attached to the conductive layer 12 Particles are mainly adsorbed on the first surface of the conductive layer 11 that is not blocked by the electret unit 12, and the electret electric field generated after the electret unit is electret can also assist the collection of the particles. In other embodiments, the electret unit is attached to the entire second surface of the conductive layer. When the active electric field is used for dust removal and purification, the particles are mainly adsorbed on the first surface of the conductive layer. When the electret electric field is used for dust removal, the particles are mainly Adsorbed on the surface of the electret unit or porous structure that is not blocked by the conductive layer. In other embodiments, the electret unit may also have a gap arrangement with at least a part of the first surface and/or the second surface of the conductive layer. When the active electric field is used for dust removal and purification, the particulate matter can be adsorbed on the first surface of the conductive layer. And the second surface, when the electret electric field is used to remove dust, the particles are mainly adsorbed on the surface of the electret unit or in the porous structure.

Experiments have confirmed that when the gas passing through the dust collector is the flow measurement type, when the electret voltage of the electret unit 12 is greater than or equal to 0.2kV, the electret electric field has a significant adsorption effect on particulate matter; and the electret voltage When the electret electric field is less than 0.2kV, the adsorption effect of the electret electric field on the particulate matter is relatively poor; when the electret voltage is less than 0.1kV, the electret electric field has no obvious adsorption effect on the particulate matter. When the gas passing through the dust collector is a through type, as long as the electret voltage of the electret unit 12 is greater than 0V, the electret electric field has a certain adsorption effect on particulate matter. The electret voltage of the electret unit 12 increases according to the increase of the thickness of the electret unit 12; the dust removal time of the electret electric field of the electret unit 12 increases according to the increase of the thickness of the electret unit 12; the electret unit 12 The dust removal time of the electret electric field of 12 increases according to the increase of the electret voltage of the electret unit 12. For example, using the discharge electrode 2 and the conductive layer 11 to form an active electric field to elect the electret unit 12, the electret time is 1min-10min, the electret voltage of 0.1mm polytetrafluoroethylene is -0.5kV, and cigarettes are used. For polluted gas, the dust removal effect can be maintained for 1-2min. If the concentration of the pollutant becomes lower, the dust removal effect time will increase; the electret time is 1min -10min, the electret voltage of 1mm PTFE is -2kV, and the pollutant gas such as cigarettes is used. , The dust removal effect can be maintained for 2-5 minutes. In other embodiments, depending on the required thickness and electret voltage of the electret unit, the electret time of the electret unit may be 10s, 30min, 5min, or 15min.

1, the dust collecting electrode 1 and the discharging electrode 2 are both flat plate-shaped and placed parallel to each other with a certain preset distance. In other embodiments, the dust collecting electrode may also be a hollow tube or a hollow tube dust collecting electrode. The cross section perpendicular to the axial direction adopts a circle or a polygon, where the polygon can be a triangle, a quadrilateral, a pentagon or a hexagon. In other embodiments, the discharge electrode may be in the shape of a needle, and the discharge electrode may be inserted into the hollow tube dust collector. Preferably, the cross-section has a regular polygonal cross-section or a circular cross-section, and the discharge electrode passes through the center of the circle inscribed in the cross-section. . In other embodiments, the discharge electrode may also be in the shape of a needle and placed on one side of the flat dust collecting electrode.

1, the electric field device further includes an insulating mechanism 3 for supporting the dust collecting electrode 1 and the discharge electrode 2 to achieve insulation between the dust collecting electrode 1 and the discharge electrode 2. In this embodiment, the electric field device includes four insulation mechanisms, and the four insulation mechanisms are arranged in a sealed arrangement with the dust collecting electrode 1 and the discharge electrode 2, so that the gas enters or discharges only through the porous structure of the dust collecting electrode 1 or the discharge electrode 2, that is It is said that the way of gas passing through the dust collector is through type. In other embodiments, the electric field device may include two insulation mechanisms, and the electric field device has side air inlets, and the way of passing the gas through the dust collecting electrode is a side-flow type.

In other embodiments, the electric field device further includes an ozone detector for detecting changes in ozone in the environment. The active electric field is used to remove dust and oxygen ionization can generate ozone. When the ozone emission exceeds the preset value of ozone, the active electric field is turned off. , Use electret electric field to continue dust removal and purification, but oxygen ionization cannot be achieved in this electric field, and no ozone is generated. Turning on and off the power loop operation can not only achieve gas dust removal and purification, but also control the ozone emission to not exceed ozone. Preset value. In other embodiments, when the ozone emission exceeds 50-100, 100-160, or 160-200 micrograms/m3, the active electric field is turned off and the ozone emission is controlled not to exceed 50-100, 100-160 or 160- 200 micrograms/cubic meter.

Hereinafter, referring to FIGS. 2 to 4, the dust collector of another embodiment of the electric field device of the present invention will be described respectively. The following only discusses the difference between the dust collector of the electric field device shown in FIGS. 2 to 4 and the dust collector of the electric field device of the previous embodiment. For description, the similarities will not be described in detail, please refer to the relevant parts mentioned above.

Fig. 2 is a three-dimensional schematic diagram of dust collectors alternately arranged along the axial direction according to an embodiment of the present invention. The dust collector 21 includes at least one conductive layer 211 and at least one electret unit 212. The electret unit 212 is arranged in the active electric field formed by the conductive layer 211 and the discharge electrode (not shown in FIG. 2), wherein the conductive layer 211 includes a first conductive layer 2111, a second conductive layer 2112, and a third conductive layer 2113. The electret unit includes a first electret unit 2121, a second electret unit 2122, and a third electret unit 2123. The dust collector 21 is a hollow tube, and the electret unit 212 and the conductive layer 211 are preferably arranged alternately in the axial direction. The first conductive layer 2111, the first electret unit 2121, and the second conductive layer 2112 are taken as examples. The structure of the conductive layer 211 and the electret unit 212 can be deduced by analogy. Specifically, the two ends of the conductive layer 211 and the electret unit 212 along the axial direction are defined as the first end and the second end, respectively. The second end of the conductive layer 2111 is spliced with the first end of the first electret unit 2121, the second end of the first electret unit 2121 is spliced with the first end of the second conductive layer 2112, and the second end of the second conductive layer 2112 is spliced. The second end is spliced with the first end of the second electret unit 2122. The discharge electrode is inserted into the hollow tubular dust collecting electrode 21. If the gas flows along the axial direction of the hollow tubular dust collecting electrode 21, it can also be understood that the way the gas flows through the dust collecting electrode 21 is the side flow type. Pass through the electret unit 212 and the conductive layer 211 alternately in sequence. In FIG. 1, the electret unit is arranged on at least a part of the first surface and/or at least a part of the second surface of the conductive layer, that is, the electret unit overlaps with at least a part of the conductive layer, which is similar to FIG. Compared with that, when the gas passes in a side-flow manner, the non-overlapping arrangement of the conductive layer 211 and the electret unit 212 in this embodiment increases the dust accumulation area. The electret unit 212 and the conductive layer 211 are preferably alternately spliced and distributed along the axial direction, which can improve the electret performance of the electret unit, avoid uneven electrets, improve the efficiency of dust accumulation, and can also realize the continuous electret of the electret unit That is to say, after the electret electric field of the electret unit disappears, the in-situ electret can be realized without replacing the electret unit.

Fig. 3 is a schematic diagram of dust collectors alternately arranged along the same plane according to an embodiment of the present invention. The dust collector 31 includes at least one conductive layer 311 and at least one electret unit 312. The electret unit 312 is arranged in the active electric field formed by the conductive layer 311 and the discharge electrode (not shown in FIG. 3). 311 includes a first conductive layer 3111, a second conductive layer 3112, and a third conductive layer 3113. The electret unit includes a first electret unit 3121, a second electret unit 3122, and a third electret unit 3123. Among them, the dust collector 31 is a flat plate, and the electret unit 312 and the conductive layer 311 are preferably alternately spliced and distributed along the same plane. Take the first conductive layer 3111, the first electret unit 3121, and the second conductive layer 3112 as examples. The structures of other conductive layers 311 and electret units 312 can be deduced by analogy. Specifically, the two ends where all conductive layers 311 and electret units 312 are joined to each other are defined as the first end and the second end, respectively (as shown in the figure). In the middle position, the left end is the first end, and the right end is the second end), the second end of the first conductive layer 3111 is spliced with the first end of the first electret unit 3121, and the second end of the first electret unit 3121 It is spliced with the first end of the second conductive layer 3112, and the second end of the second conductive layer 3112 is spliced with the first end of the second electret unit 3122. The discharge electrodes are preferably arranged at intervals on one surface of the dust collector where the electret unit 312 and the conductive layer 311 are alternately spliced and distributed, and form an air flow channel. It can be understood that when the air flow through the dust collector is a side flow type, the air flow can alternately pass through the electret unit 312 and the conductive layer 311 in turn, and the air flow can also pass through the electret unit 312 and the conductive layer 311 at the same time; When the way of passing through the dust collector is a through type, it is preferably perpendicular to the dust collector, and the airflow enters the airflow channel through the porous structure on the electret unit 312 or the conductive layer 311. This design can improve the electret performance of the electret unit, avoid uneven electrets, improve the efficiency of dust accumulation, and can also realize continuous electrets of the electret unit, that is, after the electret electric field of the electret unit disappears , No need to replace the electret unit to achieve in-situ electret.

4 is a schematic diagram of dust collectors alternately arranged in the circumferential direction according to an embodiment of the present invention. The schematic diagram is a schematic view of an end surface perpendicular to the axial direction. The dust collector 41 is a hollow tube, and the dust collector 41 includes at least one conductive layer 411 And at least one electret unit 412, the electret unit 412 and the conductive layer 411 are preferably alternately spliced and arranged in the circumferential direction, taking the first conductive layer 4111, the first electret unit 4121, and the second conductive layer 4112 as examples. The structures of other conductive layers 411 and electret units 412 can be deduced by analogy. Specifically, the two ends of all conductive layers 411 and electret units 412 distributed in the circumferential direction are defined as the first end and the second end, respectively. The second end of a conductive layer 4111 is spliced with the first end of the first electret unit 4121, the second end of the first electret unit 4121 is spliced with the first end of the second conductive layer 4112, and the second conductive layer 4112 is spliced The second end of is spliced with the first end of the second electret unit 4122. The discharge electrode is inserted in the hollow tubular dust collecting electrode 41. If the gas flows along the axial direction of the hollow tubular dust collecting electrode 41, it can also be understood that the way the gas flows through the dust collecting electrode 41 is the side flow type. At the same time, it passes through the electret units 412 and the conductive layer 411 alternately arranged in the circumferential direction. When the gas passes in a side-flow manner, the non-overlapping arrangement of the conductive layer 411 and the electret unit 412 increases the dust accumulation area. The electret unit 412 and the conductive layer 411 are preferably alternately spliced and distributed along the same plane or along the circumferential direction, which can improve the electret performance of the electret unit, avoid uneven electrets, improve dust collection efficiency, and also realize electrets The unit is continuously electret, that is, after the electret electric field of the electret unit disappears, the in-situ electret can be realized without replacing the electret unit.

Fig. 5 is a schematic diagram of dust collectors alternately arranged along the same plane according to another embodiment of the present invention. Hereinafter, only the difference between the dust collector and the dust collector of the foregoing embodiment will be described, and the similarities will not be described in detail. Please refer to the relevant parts described above. The dust collecting electrode 51 includes at least one conductive layer 511 and at least one electret unit 512, and the electret unit 512 is arranged in an active electric field formed by the conductive layer 511 and the discharge electrode (not shown in FIG. 5). Wherein, the electret unit 512 includes a first narrow portion 5121 and a first wide portion 5122, the conductive layer 511 includes a second narrow portion 5111 and a second wide portion 5112, and the first narrow portion 5121 of the electret unit 512 is adjacent to the conductive layer The second wide portion 5112 of the 511 is arranged, and the first wide portion 5122 of the electret unit 512 is arranged next to the second narrow portion 5111 of the conductive layer 511, so that the electret unit 512 and the conductive layer 511 are alternately arranged in a zigzag pattern, preferably , The electret unit 512 and the conductive layer 511 form a zigzag alternate splicing arrangement. The dust collecting electrode 51 is in the shape of a flat plate. The electret unit 512 and the conductive layer 511 are preferably arranged in a zigzag pattern and alternately spliced along the same plane. The discharge electrodes are preferably arranged at intervals in the electret unit 512 and the conductive layer 511 in a zigzag pattern. A surface of the dust pole and forms an air flow channel. It can be understood that when the airflow passing through the dust collector 51 is a side-flow type, the airflow can alternately pass through the electret unit 512 and the conductive layer 511 in turn, and the airflow can also pass through the electret unit 512 and the conductive layer 511 at the same time; When the airflow passes through the dust collector, the airflow enters the airflow channel through the electret unit 512 or the porous structure on the conductive layer 511. This design can improve the electret performance of the electret unit, avoid uneven electrets, improve the efficiency of dust accumulation, and can also realize continuous electrets of the electret unit, that is, after the electret electric field of the electret unit disappears , No need to replace the electret unit to achieve in-situ electret.

In other embodiments, the dust collecting electrode 51 may also have a hollow tube shape, the electret unit 512 and the conductive layer 511 are preferably arranged in a zigzag alternate splicing arrangement along the circumferential direction, and the discharge electrode is inserted into the hollow tube dust collecting electrode 51. If the gas flows along the axial direction of the hollow tubular dust collecting electrode 51, it can also be understood that when the gas flows through the dust collecting electrode 51 in a side-flow type, the gas simultaneously passes through the electret units 512 and 512 which are alternately arranged in the circumferential direction. Conductive layer 511. In other embodiments, the dust collecting electrode 51 may also have a hollow tube shape, the electret unit 512 and the conductive layer 511 are preferably arranged in a zigzag alternate splicing arrangement along the axial direction, and the discharge electrode is inserted into the hollow tube dust collecting electrode 51, If the gas flows along the axial direction of the hollow tubular dust collecting electrode 51, it can also be understood that when the gas flows through the dust collecting electrode 51 in a side-flow type, the gas sequentially passes through the electret units 512 and 512 which are alternately arranged in the circumferential direction. Conductive layer 511. When the gas passes in a side-flow manner, the non-overlapping arrangement of the conductive layer 511 and the electret unit 512 increases the dust accumulation area. The electret unit 512 and the conductive layer 511 preferably form a zigzag alternate splicing distribution along the same plane or along the circumferential direction or along the axis, which can improve the electret performance of the electret unit, avoid uneven electrets, and improve dust collection efficiency. It is also possible to realize the continuous electret of the electret unit, that is, after the electret electric field of the electret unit disappears, the in-situ electret can be realized without replacing the electret unit.

An embodiment of the present invention provides a gas purification device. The gas purification device includes a gas inlet for gas to enter the gas purification device, a gas outlet for gas to leave the gas purification device, and a purification module. The purification module includes one or more of the above The electric field device described in the embodiment.

The gas purification device may be an ordinary air purifier, wherein the electric field device may be used as the filter element of the air purifier, and the electric field device may be directly installed in the filter duct of the air purifier, and the particles are adsorbed during the process of passing through the dust collector. , Improve the efficiency of dust removal.

The gas purification device can be a large air volume screening program, wherein the dust collector of the electric field device can be folded as a whole or stacked in multiple layers to expand the filter area and increase the filter level. When the dust collector is stacked in multiple layers, the discharge electrode can be used. There are many to discharge the multi-layer stacked dust collector.

The gas purification device may be an automobile exhaust gas purification device, wherein the dust collecting electrode in the electric field device is bent into a tube, the discharge electrode is inserted in the tube, the exhaust gas passes sideways, and the particulate matter in the exhaust gas is adsorbed by the dust collecting electrode. The anti-fouling ability is improved, the resistance is reduced, and the adsorption efficiency is increased.

Fig. 6 is a schematic block diagram of a dust cleaning method according to an embodiment of the present invention. The method includes the following steps:

Step S100: Elect the electret unit while removing dust by the active electric field.

The active electric field formed by the discharge electrode and the conductive layer in the electric field device provided by the above embodiment is used for dust removal. When the active electric field is used for dust removal and purification, the space charge generated between the conductive layer and the discharge electrode due to corona discharge is combined with the particulate matter The particles are charged, and the conductive layer exerts an attractive force on the charged particles, so as to realize the collection of the particles. The electret unit is arranged in the space charge generated by the active electric field formed by the discharge electrode and the conductive layer, and the space charge can enter the electret unit and then elect the electret unit.

Step S200: When the electret voltage of the electret unit reaches the second voltage preset value, the electret electric field of the electret unit is used to remove dust, and the active electric field is turned off.

Specifically, when the electret voltage of the electret unit is greater than or equal to 0.2kV, the electret electric field of the electret unit is used to remove dust. In other embodiments, the electret voltage of the electret unit is greater than or equal to 0.5 kV, and the electret electric field of the electret unit is used to remove dust. In other embodiments, the electret voltage of the electret unit is greater than or equal to 2kV, and the electret electric field of the electret unit is used to remove dust.

Step S300: When the electret voltage of the electret unit is reduced to the first voltage preset value, the active electric field is turned on, and the active electric field is used to remove dust and electret the electret unit at the same time.

Specifically, when the electret voltage of the electret unit is less than 0.2kV, an active electric field is used to elect the electret unit. In other embodiments, when the electret voltage of the electret unit is less than 0.1 kV, an active electric field is used to elect the electret unit. In other embodiments, when the electret voltage of the electret unit is 0V, an active electric field is used to elect the electret unit.

Experiments have confirmed that when the gas passing through the dust collector is the flow measurement type, when the electret voltage of the electret unit is greater than or equal to 0.2kV, the electret electric field has a significant adsorption effect on particles; while the electret voltage is less than At 0.2kV, the electret electric field has a relatively poor adsorption effect on particulate matter; when the electret voltage is less than 0.1kV, the electret electric field has an insignificant adsorption effect on particulate matter. When the gas passes through the dust collector, as long as the electret voltage of the electret unit is greater than 0V, the electret electric field has a certain adsorption effect on particulate matter.

FIG. 7 is a schematic block diagram of a dust cleaning method according to another embodiment of the present invention. The following describes only the differences from the above, and the similarities will not be described in detail. Please refer to the relevant parts described above. The method includes the following steps:

Step S100: Elect the electret unit while removing dust by the active electric field.

Step S400: When the active electric field fails, the electret electric field of the electret unit is used to remove dust.

When the active electric field dust removal fails, such as the instantaneous ignition failure that often occurs in the application of the electrostatic screening program, the electrostatic electric field dust removal fails. The electret electric field is used to remove dust and continue to purify the gas, thereby solving the existing electrostatic electric field ignition transient The problem of failure.

FIG. 8 is a schematic block diagram of a dust cleaning method according to another embodiment of the present invention. The following describes only the differences from the above, and the similarities will not be described in detail. Please refer to the relevant parts described above. The method includes the following steps:

Step S100: Elect the electret unit while removing dust by the active electric field.

Step S500: When the ozone emission exceeds the preset value of ozone, the active electric field is turned off.

Step S600: Use the electret electric field of the electret unit to remove dust.

Step S700: When the electret voltage of the electret unit is reduced to the first voltage preset value, the active electric field is turned on, and the active electric field is used to remove dust while electret the electret unit.

Step S800: Control the ozone emission amount not to exceed the preset value of ozone.

Using active electric field to remove dust, oxygen ionization can generate ozone. When the ozone emission exceeds the preset value of ozone, the active electric field is turned off and the electret electric field is used to continue dust removal and purification. However, oxygen ionization cannot be achieved in this electric field and no ozone is generated. Turning on and off the power loop operation in this way can not only achieve gas dust removal and purification, but also control the ozone emission to not exceed the preset value of ozone. In other embodiments, when the ozone emission exceeds 50-100, 100-160, or 160-200 micrograms/m3, the active electric field is turned off and the ozone emission is controlled not to exceed 50-100, 100-160 or 160- 200 micrograms/cubic meter.

In summary, the electric field device, gas purification device and purification method provided by the present invention can solve the problems of large size of electric field device, failure of ignition, and generation of ozone odor, realize the technical advantages of low cost, low energy consumption, and miniaturization, and improve the electret The electret performance of the body unit realizes continuous electrets, avoids uneven electrets, increases the dust accumulation area, and improves dust accumulation efficiency.

The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

1: dust collector 11: Conductive layer 12: electret unit 2: discharge electrode 21: Positive 211: conductive layer 2111: first conductive layer 2112: second conductive layer 2113: third conductive layer 212: electret unit 2121: The first electret unit 2122: second electret unit 2123: third electret unit 3: Insulation mechanism 31: Dust Pole 311: conductive layer 3111: the first conductive layer 3112: second conductive layer 3113: third conductive layer 312: electret unit 3121: The first electret unit 3122: second electret unit 3123: third electret unit 41: Positive 411: conductive layer 4111: The first conductive layer 4112: second conductive layer 412: electret unit 4121: The first electret unit 4122: second electret unit 51: Dust Pole 511: conductive layer 5111: second narrow part 5112: Second wide part 512: electret unit 5121: The first narrow part 5122: first wide part

Figure 1 is an exploded perspective view of an electric field device according to an embodiment of the present invention; Fig. 2 is a three-dimensional schematic diagram of dust collectors alternately arranged along the axial direction according to an embodiment of the present invention; Fig. 3 is a schematic diagram of dust collectors alternately arranged along the same plane according to an embodiment of the present invention; 4 is a schematic diagram of dust collecting poles alternately arranged in the circumferential direction according to an embodiment of the present invention; Fig. 5 is a schematic diagram of dust collectors alternately arranged along the same plane according to another embodiment of the present invention; Figure 6 is a schematic block diagram of a cleaning method according to an embodiment of the present invention; FIG. 7 is a schematic block diagram of a cleaning method according to another embodiment of the present invention; and Fig. 8 is a schematic block diagram of a cleaning method according to still another embodiment of the present invention.

1: dust collector

11: Conductive layer

12: electret unit

2: discharge electrode

3: Insulation mechanism

Claims (24)

An electric field device, characterized in that the electric field device includes a dust collector and a discharge electrode, the dust collector includes a conductive layer and an electret unit, and the electret unit is arranged on the discharge electrode and the conductive electrode. The active electric field formed by the layer. The electric field device according to claim 1, wherein the conductive layer has a first surface facing the discharge electrode and a second surface opposite to the first surface, and the electret unit is arranged on the At least a part of the first surface and/or at least a part of the second surface of the conductive layer. The electric field device according to claim 2, wherein the dust collector includes a plurality of the electret units, and the plurality of electret units are arranged at a predetermined distance therebetween. At least a part of the first surface and/or at least a part of the second surface of the conductive layer. The electric field device according to claim 2 or 3, wherein the electret unit is attached to at least a part of the first surface and/or at least a part of the second surface of the conductive layer. The electric field device according to claim 2 or 3, wherein there is a gap between the electret unit and at least a part of the first surface of the conductive layer, and/or the electret unit There is a gap with at least a part of the second surface of the conductive layer. The electric field device according to claim 1, wherein there is a gap between the electret unit and at least a part of the first surface of the conductive layer, and/or the electret unit and the There is a gap between at least a part of the second surface of the conductive layer. The electric field device according to claim 6, wherein the electret unit and the conductive layer are alternately spliced and arranged in the axial direction, or in the circumferential direction, or in the same plane. The electric field device according to claim 7, wherein the electret unit includes a first narrow portion and a first wide portion, the conductive layer includes a second narrow portion and a second wide portion, and the electret The first narrow portion of the body unit is arranged next to the second wide portion of the conductive layer, and the first wide portion of the electret unit is arranged next to the second narrow portion of the conductive layer, The electret unit and the conductive layer are alternately spliced and arranged in a zigzag pattern. The electric field device according to any one of claims 1 to 8, wherein the active electric field electrets the electret unit. The electric field device according to claim 9, wherein the active electric field is used to remove dust while simultaneously electreting the electret unit. The electric field device according to claim 9 or 10, wherein the active electric field is an active electric field that is periodically on and off. The electric field device according to any one of claims 9 to 11, wherein when the electret voltage of the electret unit is reduced to a first voltage preset value, the active electric field is used to give the The electret unit is electret. The electric field device according to any one of claims 9 to 12, wherein when the electret voltage of the electret unit reaches a second voltage preset value, the electret of the electret unit is used Dust removal by body electric field. The electric field device according to any one of claims 1 to 13, wherein the way in which the air flow in the electric field device passes through the dust collecting electrode is a side flow type or a through type. The electric field device according to any one of claims 1 to 14, wherein the electret unit and/or the conductive layer has a porous structure. The electric field device according to claim 15, wherein the electret unit has a porous structure that overlaps and penetrates each other. The electric field device according to any one of claims 1 to 16, wherein the electric field device further includes an insulating mechanism, and the insulating mechanism is used to support the dust collecting electrode and the discharge electrode to realize the Insulation between the dust collecting electrode and the discharge electrode. The electric field device according to any one of claims 1 to 17, wherein the electric field device further includes an ozone detector, and the ozone detector is used to detect the ozone emission amount of the electric field device. A gas purification device, characterized in that the gas purification device includes a gas inlet for gas to enter the gas purification device, a gas outlet for gas to leave the gas purification device, and a purification module. The purification module includes a Or a plurality of electric field devices according to any one of claims 1 to 18. A purification method is characterized in that the purification method includes the following steps: using an active electric field to remove dust while electret units are electret. The purification method according to claim 20, wherein the method includes the following steps: Step 1: Elect the electret unit while using the active electric field to remove dust; Step 2: When the electret voltage of the electret unit reaches the second voltage preset value, the electret electric field of the electret unit is used to remove dust. The purification method according to claim 20, the method includes the following steps: Step 1: Elect the electret unit while using the active electric field to remove dust; Step 2: When the electret voltage of the electret unit reaches the second voltage preset value, use the electret electric field of the electret unit to remove dust and turn off the active electric field; Step 3. When the electret voltage of the electret unit is reduced to the first voltage preset value, the active electric field is turned on, and the active electric field is used to remove dust and simultaneously stabilize the electret unit. pole. The purification method according to claim 20, the method includes the following steps: Step 1: Elect the electret unit while using the active electric field to remove dust; Step 2: When the active electric field fails, the electret electric field of the electret unit is used to remove dust. The purification method according to claim 20, the method includes the following steps: Step 1: Elect the electret unit while using the active electric field to remove dust; Step 2: When the ozone emission exceeds the preset value of ozone, turn off the active electric field; Step 3: Use the electret electric field of the electret unit to remove dust; Step 4: When the electret voltage of the electret unit is reduced to the first voltage preset value, turn on the active electric field, and electret the electret unit while removing dust by the active electric field; Step 5. Control the ozone emission to not exceed the preset value of ozone.

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