CN112332221A - Electret charged restoration equipment and method - Google Patents
Electret charged restoration equipment and method Download PDFInfo
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- CN112332221A CN112332221A CN202011251330.XA CN202011251330A CN112332221A CN 112332221 A CN112332221 A CN 112332221A CN 202011251330 A CN202011251330 A CN 202011251330A CN 112332221 A CN112332221 A CN 112332221A
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- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
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Abstract
The invention provides electret charged restoration equipment and a restoration method, relates to the technical field of electronic industry, and solves the technical problem that electret charged attenuation cannot be restored. The electret charged restoration equipment comprises a base, a hot polarization charging assembly arranged on the base, a corona charging assembly positioned above the hot polarization charging assembly, and a protective cover arranged on the base and used for covering the hot polarization charging assembly and the corona charging assembly; the power supply module is electrically connected with the hot polarization charging assembly and the corona charging assembly; the repairing method comprises electret preparation, charging mode selection and parameter adjustment. The electret material can be charged at a high speed under low power, so that the electrostatic performance of the electret can be quickly repaired, and the device has lower ionization starting voltage and stronger current density through the unique electric needle structure design, so that the charge effect of the electret material is obviously improved; the device also has the characteristics of small volume, simple use and convenient operation.
Description
Technical Field
The invention relates to the technical field of electronic industry, in particular to electret charged restoration equipment and a restoration method.
Background
An electret is a special dielectric substance, which is an object having an excessive charge in a long-term storage space or maintaining a polarization state for a long time. An electret has a bulk-charge characteristic, i.e. its charge is present both on the surface and in the interior of the electret, which is similar to a permanent magnet. In recent years, electrets have been rapidly developed, and their applications are in various fields such as physics, electronics, biology, and medical treatment, and their research is more and more intensive, including various products such as microphones, sensors, transducers, instruments and meters, medical masks, and air filters.
Generally, an electret will typically have two charges present, depending on the nature and source of the electret charge: space charge and dipole charge. Space charge is generated by external electrons or ions trapped by charged particles (traps) on the surface or in the body of a dielectric, and is also called as the trapped charge of an electret. The dipole charge is usually a frozen oriented dipole, and is also called bound charge because the external field is bound in the molecule. The charging or charging methods for electrets are typically thermal polarization, corona discharge, tribocharging, electrospinning, low energy electron beam bombardment, and the like. The methods, processes and equipment used for different electrets are different. Corona charging and thermal polarization are the most common methods used in industry, and these methods are generally used only in the electret manufacturing process, and are generally large in size and complicated in operation.
During the use of the electret, the carried charges of the electret can be gradually attenuated and lost, and finally the electrostatic performance of the electret is reduced. The charge decay is influenced by the properties of the material itself and is also closely related to the use environment of the electret, such as temperature, humidity, etc. At present, no effective repair means is available for electret performance reduction caused by charge attenuation, so that most electrets belong to disposable materials, and not only is resource waste caused, but also environmental pollution is easily caused. The most typical example is a disposable medical mask, and the important reasons for the non-reuse of the mask are that the electrostatic performance of the used melt-blown electret material is reduced, the filtration requirement cannot be met, and effective charge repair cannot be carried out, so the mask can only be discarded after being used for 4 to 5 hours, thereby causing huge waste and serious environmental problems. Similar problems exist in electret application fields such as air filter element, dust removal cloth bag, dialysis membrane material and the like.
At present, people mostly focus on development and design of materials and expansion of application range in research on electrets, and research on repair of electrets is blank. Therefore, there is a need to research and develop an efficient, simple and safe electret charge restoration device to solve the problem that the charge attenuation of the electret cannot be restored, and the electret can be used and recycled for a long period through restoration.
Disclosure of Invention
The invention aims to provide electret charged restoration equipment and a restoration method, and aims to solve the technical problem that electret charged attenuation cannot be restored in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides electret charged restoration equipment which comprises a base, a hot polarization charging assembly arranged on the base, a corona charging assembly positioned above the hot polarization charging assembly, and a protective cover arranged on the base and used for covering the hot polarization charging assembly and the corona charging assembly; and the power module is electrically connected with the hot polarization charging assembly and the corona charging assembly.
As a further improvement of the invention, the power supply module comprises an electric needle array high-voltage power supply assembly, a grid electrode high-voltage power supply assembly and an electric heating temperature control assembly, and the voltage of the electric needle array and the grid electrode plate and the temperature of the heating table can be adjusted and controlled through the assemblies.
As a further improvement of the present invention, the thermal polarization charging assembly includes a heating stage disposed on the base and a ground electrode plate disposed on the heating stage, and the heating stage is electrically connected to the power module.
As a further improvement of the invention, the corona charging assembly comprises a grid electrode plate placed above the heating table and an electric needle array movably arranged on the base and positioned above the grid electrode plate; a space for placing the electret to be repaired is enclosed between the grid electrode plate and the ground electrode plate; the grid electrode plate and the electric needle array are electrically connected with the power supply module.
According to the electret charged repairing equipment, a corona charging technology and a hot polarization charging technology are combined, an electret material can be charged at a high speed under low power through an optimized electric pin row design, so that the electrostatic performance of the electret can be rapidly repaired, and flexible and suitable charging conditions can be provided for different electret materials through a movable electric pin row and gate electrode plate design and an adjustable electric pin row layout, so that the electret repairing requirements under different conditions can be met.
As a further improvement of the invention, the grid electrode plate specification is not larger than the electric needle array specification, and the grid electrode plate specification is larger than the electret specification to be repaired.
As a further improvement of the present invention, the electric needle array includes a conductive metal plate, a first insulating layer provided around the conductive metal plate, and a plurality of needle electrodes detachably provided on the conductive metal plate, all of the needle electrodes being arranged in a uniform array. The first insulating layer plays a role in insulation and protection; the conductive metal plate is connected with the electric needle array high-voltage power supply assembly through a lead, and the conductive metal plate is used for fixing the needle electrode and supplying power to the needle electrode.
As a further improvement of the present invention, the pin electrodes include breakdown protection long pins and electret charging short pins, and the breakdown protection long pins surround all the electret charging short pins; the electric needle array can be divided into an inner part and an outer part, wherein an electret charging short electric needle is arranged in the inner part and used for charging an electret, and the array shape and the needle electrode height can be adjusted according to the electret; the outside is the long electric needle of breakdown protection, and length is longer 5mm than other electric needles for spark breakdown protection.
As a further improvement of the invention, the tail end of the needle electrode is provided with a reducing part to form a needle point structure; an arc transition structure is arranged between the needle tip structure and the needle electrode; the diameter of the needle electrode is not more than 8 mm; the distance between every two adjacent needle electrodes is not less than 5 mm; the radius of curvature of the tip structure is not greater than 100 microns.
As a further improvement of the invention, the diameter of the needle electrode is 1mm, the curvature radius of the needle tip structure is 10 microns, and the distance between two adjacent needle electrodes is 10 mm.
As a further improvement of the invention, the needle electrode and the conductive metal plate are fixed in a threaded manner, and can be quickly disassembled and assembled according to the requirements of the electret process.
As a further improvement of the invention, the gate electrode plate comprises a conductive metal mesh, a second insulating layer surrounding the conductive metal mesh, and a support structure arranged at the four corners of the second insulating layer, and the gate electrode plate is used for improving the uniformity of the surface charge and the electric potential of the electret.
As a further improvement of the invention, the protective cover is made of transparent insulating material, a cover door capable of opening and closing is arranged on the front side of the protective cover, and a state switch electrically connected with the power supply module is arranged between the cover door and the protective cover.
As a further improvement of the invention, the protective cover is made of acrylic material, and the transparent protective cover is used for safety protection during charging operation; in order to facilitate operation, the front part of the electric energy meter is designed into an opening-closing type cover door, and is provided with a cover door opening-closing state switch which controls the power supply condition of a system through a power module.
As a further improvement of the present invention, the heating table is heated by electricity, and the heating temperature is set and controlled by the power module.
As a further improvement of the invention, the electric needle array is arranged on the base through a lifting column.
As a further improvement of the invention, the mesh diameter of the conductive metal net is not more than 1 mm.
As a further improvement of the invention, the ground electrode plate is made of a conductive metal plate material.
As a further improvement of the invention, the length of the breakdown protection long electric needle is 5mm longer than that of the electret charging short electric needle.
The invention provides a repairing method, in particular to a method for repairing an electric charge by using electret electric charge repairing equipment, which comprises the following steps:
step 100, electret preparation: according to the shape of the electret to be repaired and the requirements of the electret, needle electrodes in the electric needle array are adjusted to be proper in length, and the lifting column is adjusted to enable the electric needle array to be at a required height; placing an electret on a ground electrode plate, covering a grid electrode plate, and closing a transparent protective cover door;
step 200, selecting a charging mode: selecting a positive high-voltage or negative high-voltage charging mode according to the requirements of the electret material, connecting the electric needle array and the gate electrode plate with the positive electrode or the negative electrode in the power module, connecting the ground electrode plate with the negative electrode or the positive electrode in the power module, and electrifying the power module;
step 300, parameter adjustment: and respectively adjusting the temperature of the heating table, the working voltage of the gate electrode plate and the working voltage of the electric needle array to required values according to the electret process requirements, and keeping the stable state for required time to finish the charged restoration of the electret.
As a further improvement of the invention, in step 300, the working voltage of the electric needle array is 1-50KV, and the working voltage of the gate electrode plate is 0.5-2 KV.
As a further improvement of the present invention, in step 200, when the charging mode is a negative high voltage charging mode, the electric pin array and the gate electrode plate are connected to the negative electrode of the power module, and the ground electrode plate is connected to the positive electrode of the power module.
Compared with the prior art, the invention has the following beneficial effects:
according to the electret charged repairing equipment and the repairing method, a corona charging technology and a hot polarization charging technology are combined, and the electret material can be charged at a high speed under low power, so that the electrostatic performance of the electret can be rapidly repaired; through the unique electric needle structure design, the device has lower ionization starting voltage and stronger current density, and the charge effect of the electret material is obviously improved; the design of the protective electric needle array can effectively protect the electret material and avoid spark breakdown to damage the electret; the design of the voltage-controllable and movable pin columns and the gate electrode plate and the layout of the adjustable pin columns can provide flexible and appropriate charging conditions for different electret materials so as to meet the electret repair requirements under different conditions, and simultaneously, the uniform distribution of surface charges and potentials of the electret materials is facilitated, and the electrostatic performance of the electret materials is improved; the polarization temperature can be accurately and stably controlled by a temperature-controllable bottom electric heating mode, the temperature distribution is more uniform, and the electret effect is better; the high-voltage micro-current pulse environment and the generated weak ionized gas in the electret process can effectively kill the microorganisms such as viruses, bacteria, spores and the like, and the rapid disinfection of the electret material is realized; the safety design of a closed power supply type equipment structure, the circuit design of high-voltage micro-current, the circuit overload early warning, the circuit breaking protection and the like ensures the safety and the reliability of the electret process; the equipment has small volume, simple use and convenient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of an electret charged restoration device of the invention;
FIG. 2 is a front view of an array of electrical pins in the electret charged restoration device of the invention;
FIG. 3 is a top view of an array of electrical pins in an electret charged restoration apparatus according to the invention;
FIG. 4 is a front view of a needle electrode in the electret charged restoration device of the invention;
fig. 5 is a top view of a gate electrode plate in the electret charged restoration device according to the present invention.
In figure 1, a power supply module; 2. an array of electrical pins; 21. a conductive metal plate; 22. a first insulating layer; 23. a needle electrode; 231. breakdown protection of the long electric needle; 232. an electret charging short electric needle; 3. a lifting column; 4. a gate electrode plate; 41. a conductive metal mesh; 42. a second insulating layer; 43. a support structure; 5. a ground electrode plate; 6. a heating stage; 7. a base; 8. a protective cover; 9. the electret to be repaired.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the present invention provides an electret charging repair device, which includes a base 7, a thermal polarization charging assembly disposed on the base 7, a corona charging assembly disposed above the thermal polarization charging assembly, and a protective cover 8 disposed on the base 7 to cover the thermal polarization charging assembly and the corona charging assembly; and the power module 1 is electrically connected with the hot polarization charging assembly and the corona charging assembly.
According to the electret charged repairing equipment, the corona charging technology and the hot polarization charging technology are combined, and the electret material can be charged at a high speed under low power through the optimized electric needle array design, so that the electrostatic performance of the electret can be rapidly repaired.
Further, the hot polarization charging assembly comprises a heating table 6 arranged on the base 7 and a ground electrode plate 5 arranged on the heating table 6, and the heating table 6 is electrically connected with the power module 1.
Specifically, the heating table 6 is heated electrically, and the heating temperature is set and controlled by the power module 1.
As shown in fig. 1, as an alternative embodiment of the present invention, the corona charging assembly includes a grid electrode plate 4 disposed above a heating stage 6 and an electric needle array 2 movably disposed on a base 7 and above the grid electrode plate 4; a space for placing the electret 9 to be repaired is enclosed between the grid electrode plate 4 and the ground electrode plate 5; the grid electrode plate 4 and the electric needle array 2 are both electrically connected with the power module 1.
It should be noted that in an alternative embodiment of the present invention, the electrical needle array 2 is disposed on the base 7 through the lifting column 3. Specifically, lift post 3 is located 7 one ends of base, and 2 limit portions of electricity needle array are fixed on lift post 3, and lift post 3 adopts the product among the prior art to realize, can go up and down and go up and down the position locking after accomplishing. Due to the adoption of the prior art product, the specific structure is not described again, and the electric needle array 2 can be driven to lift and position to be locked.
In order to ensure the repairing effect, the specification of the gate electrode plate 4 is not larger than that of the electric needle array 2, and the specification of the gate electrode plate 4 is larger than that of the electret 9 to be repaired. That is, the whole gate electrode plate 4 is located in the top projection area of the electric needle array 2, and the whole electret to be repaired 9 is located in the top projection area of the gate electrode plate 4.
Specifically, the horizontal distance between the end of the breakdown protection long electric needle 231 and the edge of the electret 9 to be repaired is not less than 2 cm.
As shown in fig. 2 and 3, as an alternative embodiment of the present invention, the electric needle array 2 includes a conductive metal plate 21, a first insulating layer 22 provided around the conductive metal plate 21, a plurality of needle electrodes 23 detachably provided on the conductive metal plate 21, and all the needle electrodes 23 are arranged in a uniform array. The first insulating layer 22 plays a role of insulation and protection; the conductive metal plate 21 is connected with the electric needle array high-voltage power supply assembly through a lead, and the conductive metal plate 21 is used for fixing the needle electrode 23 and supplying power to the needle electrode 23. It should be noted that the first insulating layer 22 is a cover-shaped structure, and includes a base portion and a wall portion surrounding the base portion, and the conductive metal portion 21 is placed on the top of the inner cavity of the first insulating layer 22.
In order to improve the application range of equipment and meet the requirements of rapid assembly, disassembly and assembly of an electret process, a thread type fixing mode is adopted between the needle electrodes 23 and the conductive metal plate 21, each needle electrode 23 on the electric needle array 2 can be detached, replaced or adjusted in layout, the length of the needle electrode 23 can be adjusted by adjusting the thread connection depth of the needle electrode 23 on the conductive metal plate 21, or the needle electrodes 23 with different lengths are directly replaced to realize the length adjustment of the electric needle array 2, or the array form of interval arrangement between the needle electrodes 23 is adjusted, flexible and appropriate charging conditions can be provided for electrets through the structure, and the electret repairing requirements under different conditions can be met.
As shown in fig. 2, as an alternative embodiment of the present invention, the needle electrode 23 includes a breakdown protection long electric needle 231 and an electret charging short electric needle 232, and the breakdown protection long electric needle 231 is enclosed outside all the electret charging short electric needles 232; the length of the breakdown protection long electric needle 231 is 5mm longer than that of the other electret charging short electric needles 232; the height of the electric needle array 2 is adjusted through adjustment of the lifting column 3, and the distance between the tail end of the breakdown protection long electric needle 231 and the electret 9 to be repaired is not less than 2cm when repair is guaranteed. The electret charging short electric needle 232 is positioned in the electric needle array 2 and used for charging the electret, and the array shape and the height of the needle electrode 23 can be adjusted according to the electret; breakdown protection long electrical pins 231 are located outside the electrical pin array 2 for spark breakdown protection.
As shown in fig. 4, in order to make the starting voltage of the electric needle array 2 low and to generate corona more easily, the tail end of the needle electrode 23 has a tapered part to form a needle point structure; an arc transition structure is arranged between the needle tip structure and the needle electrode 23; it should be noted that the diameter of the needle electrode 23 is not more than 8 mm; the distance between two adjacent needle electrodes 23 is not less than 5 mm; the radius of curvature of the tip structure is no greater than 100 microns.
As shown in fig. 5, as an alternative embodiment of the present invention, the gate electrode plate 4 includes a conductive metal mesh 41, a second insulating layer 42 surrounding the conductive metal mesh 41, and a support structure 43 disposed at four corners of the second insulating layer 42, and the gate electrode plate 4 is used to improve the uniformity of the surface charge and potential of the electret.
Further, the protective cover 8 is made of transparent insulating material, a cover door capable of being opened and closed is arranged on the front side of the protective cover 8, and a state switch electrically connected with the power module 1 is arranged between the cover door and the protective cover 8. The transparent protective cover is used for safety protection during charging operation; in order to facilitate operation, the front part of the electric energy meter is designed into an opening-closing type cover door, and is provided with a cover door opening-closing state switch which controls the power supply condition of a system through a power module.
Specifically, the ground electrode plate 5 is made of a conductive metal plate.
Specifically, the mesh diameter of the conductive metal net 41 is not more than 1 mm.
Example 1:
in the present embodiment, as shown in fig. 1, an electret charge restoration device is provided, which is composed of a power module 1, an electric needle array 2, a lifting column 3, a gate electrode plate 4, a ground electrode plate 5, a heating stage 6, a base 7, a transparent protective cover 8 and its related circuits, meters, and the like.
The power module 1 comprises an electric needle array high-voltage power supply assembly, a gate electrode high-voltage power supply assembly and an electric heating temperature control assembly, and the voltage of the electric needle array 2 and the gate electrode plate 4 and the temperature of the heating table 6 can be adjusted and controlled through the assemblies.
The high-voltage power supply assembly of the electric needle array and the high-voltage power supply assembly of the gate electrode are divided into a low-voltage module and a high-voltage module from the voltage level, wherein the low-voltage module comprises a rectifying and filtering circuit, an inverter circuit, a control circuit, a driving circuit and an overvoltage protection and zero resetting starting circuit; the high-voltage module comprises a high-frequency boosting transformer and a voltage-doubling rectifying circuit. The low-voltage control circuit and the high-voltage component are respectively and correspondingly arranged on respective PCB boards and are electrically connected through a soft signal wire; the high-voltage component is encapsulated in the high-voltage insulating glue and then is installed on the PCB. Wherein, high voltage insulation glue includes: silicon sulfide rubber, epoxy resin, high voltage insulating silicone grease, and the like. Under the normal condition, when the high voltage without insulation encapsulation exceeds 5kV, the discharge phenomenon is possible to occur, and the problems of circuit interference and equipment damage caused by breakdown discharge of high-voltage components exposed in the space can be avoided through the design of high-voltage insulation encapsulation. The thickness of the potting can be determined according to the high pressure value, and the dielectric strength of the common epoxy resin is about 20 kV/cm. In order to improve the heat conductivity, a small amount of boron nitride can be added into the silicone rubber. According to the novel electret charged restoration technology and the equipment thereof, an electric needle array high-voltage power supply component and a grid electrode high-voltage power supply component are divided into a low-voltage module and a high-voltage module from the voltage level, wherein the low-voltage module comprises a rectifying filter circuit, an inverter circuit, a control circuit, a driving circuit and an overvoltage protection and return-to-zero starting circuit; the high-voltage module comprises a high-frequency boosting transformer and a voltage-doubling rectifying circuit. The low-voltage control circuit and the high-voltage component are respectively and correspondingly arranged on respective PCB boards and are electrically connected through a soft signal wire; the high-voltage component is encapsulated in high-voltage insulating glue and then is installed on the PCB. Wherein, the high voltage insulation glue includes: silicon sulfide rubber, epoxy resin, high voltage insulating silicone grease, and the like. Under the normal condition, when the high voltage without insulation encapsulation exceeds 5kV, the discharge phenomenon is possible to occur, and the problems of circuit interference and equipment damage caused by breakdown discharge of high-voltage components exposed in the space can be avoided through the design of high-voltage insulation encapsulation. The thickness of the potting can be determined according to the high pressure value, and the dielectric strength of the common epoxy resin is about 20 kV/cm. In order to improve the heat conductivity, a small amount of boron nitride can be added into the silicone rubber.
The electric needle array 2 comprises a middle conductive metal plate 21, the conductive metal plate 21 is connected with the electric needle array high-voltage power supply assembly through a lead, and the conductive metal plate 21 is used for fixing the needle electrode 23 and supplying power to the needle electrode 23; the conductive metal plate 21 is of a square or rectangular structure (as shown in fig. 3), the outer layer of the conductive metal plate 21 is coated with a first insulating layer 22 made of an epoxy resin plate to play a role in insulation and protection, pin electrodes 23 are arranged on the conductive metal plate 21 in a multi-row and multi-row array form, and the pin electrodes 23 between two adjacent rows are equal in spacing; of course, the conductive metal plate 21 may have other shapes, and the pin electrodes 23 may be arranged in a non-row and non-row array, for example, the conductive metal plate 21 may be arranged in a triangular shape, a star shape, a circular shape or other shapes, and the pin electrodes 23 may be arranged in an array form such as a circular ring shape, a zigzag array form, or the like. Here, the shape and the array form are not particularly limited.
The lifting column 3 is positioned on one side of the base 7, the middle part of one side of the electric needle array 2 is connected with the lifting column 3, and the power supply module 1 is fixed on the top of the lifting column 3; the protective cover 8 can cover the lifting column 3 and is arranged in the lifting column, and a through hole which is opened along the vertical direction can be arranged at the position corresponding to the lifting column 3, so that a connecting piece between the lifting column 3 and the electric needle array 2 can conveniently penetrate through the through hole.
Specifically, the diameter of the needle electrode 23 is 1mm, the curvature radius of the needle tip structure is 10 μm, and the needle pitch is 10 mm.
In this embodiment, the needle electrode 23 includes the breakdown protection long electric needles 231 located at the outer ring and the short electret charging short electric needles 232 located at the inner ring and having a shorter length, wherein the electret charging short electric needles 232 are arranged in a multi-row rectangular array, the breakdown protection long electric needles 231 are located outside all the electret charging short electric needles 232 and arranged in a rectangular ring shape, and the transverse and longitudinal positions of all the breakdown protection long electric needles 231 are arranged in one-to-one correspondence with the rows and rows of the electret charging short electric needles 232 at the inner ring.
In this embodiment, breakdown protection long pin 231 is 5mm longer than electret charging short pin 232.
In order to ensure the repairing effect, the electret 9 to be repaired is wholly located in the top projection area of the grid electrode plate 4, the grid electrode plate 4 is wholly located in the top projection area of the electric needle array 2, and in the embodiment, the horizontal distance from the breakdown protection long electric needle 231 to the edge of the electret material is 5 cm.
The grid electrode plate 4 is composed of a conductive metal net 41 and a second insulating layer 42, and the second insulating layer 42 can also be made of an epoxy resin plate, wherein the mesh diameter of the conductive metal net 41 is 0.5 mm.
The working voltage of the electric needle array 2 is 1-50KV, and the working voltage of the gate electrode plate 4 is 0.5-2 KV.
The charging mode of the electret charge repairing equipment can be a positive high-voltage or negative high-voltage charging mode according to the requirements of electret materials, and the optimal charging mode is a negative high-voltage charging mode, namely the negative electrode of the power module 1 of the electric needle array 2 and the grid electrode connecting plate 4, and the positive electrode of the power module 1 of the ground electrode plate 5 are connected.
The invention provides a repairing method, in particular to a method for repairing charged objects by using electret charged repairing equipment, which comprises the following steps:
step 100, electret preparation: according to the shape of the electret to be repaired and the requirements of the electret, needle electrodes in the electric needle array are adjusted to be proper in length, and the lifting column is adjusted to enable the electric needle array to be at a required height; placing an electret on a ground electrode plate, covering a grid electrode plate, and closing a transparent protective cover door;
step 200, selecting a charging mode: selecting a positive high-voltage or negative high-voltage charging mode according to the requirements of the electret material, connecting the electric needle array and the gate electrode plate with the positive electrode or the negative electrode in the power module, connecting the ground electrode plate with the negative electrode or the positive electrode in the power module, and electrifying the power module;
step 300, parameter adjustment: and respectively adjusting the temperature of the heating table, the working voltage of the gate electrode plate and the working voltage of the electric needle array to required values according to the electret process requirements, and keeping the stable state for required time to finish the charged restoration of the electret.
In step 300, the working voltage of the electric needle array is 1-50KV, and the working voltage of the gate electrode plate is 0.5-2 KV.
In step 200, when the charging mode is a negative high voltage charging mode, the electric pin array and the gate electrode plate are connected with the negative electrode of the power module, and the ground electrode plate is connected with the positive electrode of the power module.
After the electret charged repairing equipment provided by the invention is used for carrying out charged repairing on the disposable medical mask, the test result is as follows: the filtering efficiency of the air flow rate (85 +/-2) L/min to the sodium chloride aerosol with the aerodynamic median diameter (0.24 +/-0.06) mu m is improved from 83 percent to 97 percent, namely the air flow rate meets the grade of N95 (or FFP2) and above.
It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in fig. 1 to facilitate the description of the invention and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The electret charged restoration equipment is characterized by comprising a base, a hot polarization charging assembly arranged on the base, a corona charging assembly positioned above the hot polarization charging assembly, and a protective cover arranged on the base to cover the hot polarization charging assembly and the corona charging assembly; and the power module is electrically connected with the hot polarization charging assembly and the corona charging assembly.
2. The electret charged restoration device according to claim 1, wherein the thermal polarization charging assembly comprises a heating stage disposed on the base and a ground electrode plate disposed on the heating stage, and the heating stage is electrically connected to the power module.
3. The electret charged restoration device according to claim 2, wherein the corona charging assembly comprises a grid electrode plate placed above the heating stage and an array of electrical pins movably disposed on the base above the grid electrode plate; a space for placing the electret to be repaired is enclosed between the grid electrode plate and the ground electrode plate; the grid electrode plate and the electric needle array are electrically connected with the power supply module.
4. The electret charged restoration device according to claim 3, wherein the grid electrode plate specification is not larger than the electric needle array specification, and the grid electrode plate specification is larger than the electret specification to be restored.
5. The electret charged restoration device according to claim 3, wherein the electric pin array comprises a conductive metal plate, a first insulating layer surrounding the conductive metal plate, and a plurality of pin electrodes detachably disposed on the conductive metal plate, all the pin electrodes being arranged in a uniform array.
6. The electret charge restoration device according to claim 5, wherein the pin electrodes comprise breakdown-protected long pins and electret charge short pins, and the breakdown-protected long pins are arranged around all the electret charge short pins.
7. The electret charged restoration device according to claim 5, wherein the needle electrode tip has a reducing portion forming a needle point structure; an arc transition structure is arranged between the needle tip structure and the needle electrode; the diameter of the needle electrode is not more than 8 mm; the distance between every two adjacent needle electrodes is not less than 5 mm; the radius of curvature of the tip structure is not greater than 100 microns.
8. The electret charged restoration device according to claim 3, wherein the gate electrode plate comprises a conductive metal mesh, a second insulating layer surrounding the conductive metal mesh, and a support structure arranged at four corners of the second insulating layer.
9. The electret charged restoration device according to claim 1, wherein the protective cover is made of transparent insulating material, the front side of the protective cover is provided with an openable and closable cover door, and a status switch electrically connected with the power module is arranged between the cover door and the protective cover.
10. A method of restoration, wherein the method of electrets restoration using an electret charged restoration apparatus according to any one of claims 1 to 9, comprises the following steps:
step 100, electret preparation: according to the shape of the electret to be repaired and the requirements of the electret, needle electrodes in the electric needle array are adjusted to be proper in length, and the lifting column is adjusted to enable the electric needle array to be at a required height; placing an electret on a ground electrode plate, covering a grid electrode plate, and closing a transparent protective cover door;
step 200, selecting a charging mode: selecting a positive high-voltage or negative high-voltage charging mode according to the requirements of the electret material, connecting the electric needle array and the gate electrode plate with the positive electrode or the negative electrode in the power module, connecting the ground electrode plate with the negative electrode or the positive electrode in the power module, and electrifying the power module;
step 300, parameter adjustment: and respectively adjusting the temperature of the heating table, the working voltage of the gate electrode plate and the working voltage of the electric needle array to required values according to the electret process requirements, and keeping the stable state for required time to finish the charged restoration of the electret.
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| CN110749804A (en) * | 2018-07-23 | 2020-02-04 | 华北电力大学（保定） | Multi-pin plate electrode for artificial uniform corona accelerated aging test of composite insulator |
| CN213341084U (en) * | 2020-11-11 | 2021-06-01 | 北京英华高科技环保有限公司 | Electret charged restoration equipment |
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| CN108508282A (en) * | 2018-06-04 | 2018-09-07 | 深圳供电局有限公司 | Measuring equipment for surface potential of thin film material |
| CN110749804A (en) * | 2018-07-23 | 2020-02-04 | 华北电力大学（保定） | Multi-pin plate electrode for artificial uniform corona accelerated aging test of composite insulator |
| CN109395682A (en) * | 2018-12-18 | 2019-03-01 | 东北大学 | A kind of filtering material electret device and method |
| CN213341084U (en) * | 2020-11-11 | 2021-06-01 | 北京英华高科技环保有限公司 | Electret charged restoration equipment |
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